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Circulation. 2003;107:461-468
Published online before print December 30, 2002, doi: 10.1161/01.CIR.0000046450.89986.50
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(Circulation. 2003;107:461.)
© 2003 American Heart Association, Inc.


Basic Science Reports

Intramyocardial Transplantation of Autologous Endothelial Progenitor Cells for Therapeutic Neovascularization of Myocardial Ischemia

Atsuhiko Kawamoto, MD; Tengis Tkebuchava, MD; Jun-Ichi Yamaguchi, MD; Hiromi Nishimura, MD; Young-Sup Yoon, MD; Charles Milliken, BS; Shigeki Uchida, MD; Osamu Masuo, MD; Hideki Iwaguro, MD; Hong Ma, BS; Allison Hanley, BS; Marcy Silver, BS; Marianne Kearney, BS; Douglas W. Losordo, MD; Jeffrey M. Isner, MD{dagger}; Takayuki Asahara, MD

From the Division of Cardiovascular Research, St Elizabeth’s Medical Center, Tufts University School of Medicine, Boston, Mass (all authors), and the Department of Physiology, Tokai University School of Medicine, Japan (T.A.).

Correspondence to Takayuki Asahara, MD, or Douglas W. Losordo, MD, Division of Cardiovascular Research, St Elizabeth’s Medical Center, 736 Cambridge St, Boston, MA 02135. E-mail asa777{at}aol.com or douglas.losordo@tufts.edu


*    Abstract
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Background— We investigated whether catheter-based, intramyocardial transplantation of autologous endothelial progenitor cells can enhance neovascularization in myocardial ischemia.

Methods and Results— Myocardial ischemia was induced by placement of an ameroid constrictor around swine left circumflex artery. Four weeks after constrictor placement, CD31+ mononuclear cells (MNCs) were freshly isolated from the peripheral blood of each animal. After overnight incubation of CD31+ MNCs in noncoated plates, nonadhesive cells (NA/CD31+ MNCs) were harvested as the endothelial progenitor cell–enriched fraction. Nonadhesive CD31- cells (NA/CD31- MNCs) were also prepared. Autologous transplantation of 107 NA/CD31+ MNCs, 107 NA/CD31- MNCs, or PBS was performed with a NOGA mapping injection catheter to target ischemic myocardium. In a parallel study, 105 human CD34+ MNCs, 105 human CD34- MNCs, or PBS was transplanted into ischemic myocardium of nude rats 10 minutes after ligation of the left anterior descending coronary artery. In the swine study, ischemic area by NOGA mapping, Rentrop grade angiographic collateral development, and echocardiographic left ventricular ejection fraction improved significantly 4 weeks after transplantation of NA/CD31+ MNCs but not after injection of NA/CD31- MNCs or PBS. Capillary density in ischemic myocardium 4 weeks after transplantation was significantly greater in the NA/CD31+ MNC group than the control groups. In the rat study, echocardiographic left ventricular systolic function and capillary density were significantly better preserved in the CD34+ MNC group than in the control groups 4 weeks after myocardial ischemia.

Conclusions— These favorable outcomes encourage future clinical trials of catheter-based, intramyocardial transplantation of autologous CD34+ MNCs in the setting of chronic myocardial ischemia.


Key Words: transplantation • cells • catheters • ischemia • vasculogenesis


*    Introduction
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Endothelial progenitor cells (EPCs) were first isolated as CD34+ mononuclear cells (MNCs) from adult peripheral blood.1,2 Tissue ischemia mobilizes EPCs from bone marrow to peripheral blood, and mobilized EPCs home specifically to sites of nascent neovascularization and differentiate into mature endothelial cells (ECs).3 The demonstrated role of EPCs in the physiological response to ischemia has led to the development of strategies of cell therapy for neovascularization in ischemic diseases. Intravenous transplantation of cultured human EPCs enhances neovascularization and improves limb salvage in nude mice with hindlimb ischemia.4 A similar strategy applied in a model of myocardial ischemia in the nude rat demonstrated that transplanted human EPCs incorporated into rat myocardial neovascularization, differentiated into mature ECs in ischemic myocardium, enhanced neovascularization, preserved left ventricular (LV) function, and inhibited myocardial fibrosis.5 Recently, Kocher et al6 attempted intravenous infusion of freshly isolated (not cultured) human CD34+ MNCs (EPC-enriched fraction) into nude rats with myocardial ischemia. This strategy resulted in preservation of LV function associated with inhibition of cardiomyocyte apoptosis. These experimental findings in immunodeficient animals suggest that both cultured and freshly isolated human EPCs have therapeutic potential in peripheral and coronary artery diseases.

Although these previous reports indicate a potential therapeutic role for EPCs in ischemic diseases, 2 major obstacles exist that must be overcome before considering actual clinical applications: dosage and immunologic rejection. In the previous study by our laboratory,5 1x106 cultured EPCs were used for each {approx}200-g rat. Kocher et al6 transplanted 1x106 freshly isolated EPCs/100-g rat. On a weight-adjusted basis, this would translate into 3x108 to 6x108 cells for an average-size human, requiring 8.5 to 120 L of peripheral blood. Although it may be possible to obtain enough EPCs from bone marrow in the clinical situation, it is a far from realistic strategy to isolate EPCs from peripheral blood by the previous methods. Moreover, these previous studies used an immunodeficient rat model to circumvent issues of cell rejection.

Accordingly, we designed a series of in vivo investigations to address the limitations of these previous approaches. First, we tested the hypothesis that local transplantation of EPCs, rather than systemic infusion, would permit a significant reduction in the number of EPCs required. Second, we developed a strategy that relies on freshly isolated, autologous EPCs that would allow us to evaluate the therapeutic potential of autologous EPC transplantation. We therefore performed catheter-based transplantation of a freshly isolated, autologous EPC-enriched fraction in a swine chronic myocardial ischemia model. To verify the therapeutic usefulness of the freshly isolated, human EPC-enriched fraction, we also performed intramyocardial transplantation in immunodeficient rats with myocardial ischemia using freshly isolated human CD34+ MNCs.


*    Methods
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Animal Models of Myocardial Ischemia
Acute myocardial ischemia was induced by ligating the left anterior descending coronary artery (LAD) of male athymic nude rats (Hsd: RH-rnu rats, Harlan Sprague Dawley, Indianapolis, Ind) 6 to 8 weeks old.5

Male Yorkshire swine (Pine Acre Rabbitry Farm, Norton, Mass) weighing 20 to 25 kg were used to induce chronic myocardial ischemia. After left thoracotomy, an ameroid constrictor (Research Instruments SW) was placed around the proximal portion of the left circumflex (LCx) coronary artery.7

Isolation and Autologous, Percutaneous, Intramyocardial Transplantation of Swine EPCs
Four weeks after constrictor placement, 150 mL of peripheral blood was obtained from the ear vein of each pig. Total peripheral blood MNCs were isolated by density-gradient centrifugation. The MACS bead selection method for CD31 (Miltenyi Biotec) was used to isolate the EPC-enriched fraction from total MNCs (anti-swine CD34 antibody is not available). CD31+ MNCs resuspended in EC basal medium-2 (EBM-2, Clonetics) were cultured overnight in noncoated plastic plates at a density of 5x106 cells/10-cm plate. To remove macrophages, only nonadhesive CD31+ (NA/CD31+) MNCs were collected as the EPC-enriched fraction. CD31- MNCs were treated similarly, and nonadhesive CD31- MNCs (NA/CD31- MNCs) were obtained as a negative control.

To elucidate in vivo differentiation to endothelial lineage, 107 NA/CD31+ or the same number of NA/CD31- autologous MNCs were labeled with fluorescent carbocyanine 1,1'-dioctadecyl-1-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI) dye (Molecular Probes) and were injected via a 27-gauge needle to the LV lateral wall 4 weeks after constrictor placement. Four weeks after cell transplantation, 5 mg of Bandeiraea simplicifolia lectin I (BS-1 lectin) (Vector Laboratories), which is a murine- and porcine-specific (not human) EC marker, was infused into the left coronary artery, and the pigs were killed by an overdose of pentobarbital. Fluorescence microscopy was performed to examine incorporation of transplanted cells into foci of myocardial neovascularization.

After these preliminary studies, we examined the therapeutic potential of autologous, percutaneous, intramyocardial transplantation of an EPC-enriched MNC fraction in the swine chronic myocardial ischemia model. Four weeks after constrictor placement, NOGA nonfluoroscopic LV electromechanical mapping was performed to guide injections to foci of myocardial ischemia. The NOGA system (Biosense-Webster) of catheter-based mapping and navigation has been described in detail previously.810 Ischemic myocardium was defined as a zone with unipolar voltage greater than the automatically determined cutoff, signified by red color on the unipolar voltage map and linear local shortening <3% on the linear local shortening map. This definition was consistent in all examinations throughout this study. Immediately after the ischemic territory was identified by NOGA mapping, 107 NA/CD31+ MNCs in 1 mL of PBS (n=7), 107 NA/CD31- MNCs in 1 mL of PBS (n=8), or 1 mL of PBS without cells (n=9) were injected into 5 sites within the ischemic myocardium (200 µL to each site) with the NOGA injection catheter (Biosense-Webster).

Fresh Isolation and Intramyocardial Transplantation of Human EPCs
Human total peripheral blood MNCs were isolated from healthy volunteers by density-gradient centrifugation, and CD34+ MNCs were isolated from total MNCs by the MACS bead selection method (Miltenyi Biotec) as the EPC-enriched fraction.1 After the isolation, CD34- MNCs were also collected. CD34+ MNCs and CD34- MNCs were labeled with DiI. Ten minutes after the LAD of nude rats (n=2) had been ligated, 105 DiI-labeled CD34+ MNCs in 100 µL of PBS or 105 DiI-labeled CD34- MNCs in 100 µL of PBS were injected into 2 sites in the ischemic LAD territory with a 27-gauge needle (50 µL to each site). The ischemic zone was macroscopically identified by the pale color of the anterior and lateral walls after LAD ligation. This subgroup of rats was killed 10 days after myocardial ischemia. Thirty minutes before euthanization by overdose of pentobarbital, 500 µg of BS-1 lectin was administered intravenously. The hearts were fixed with 4% paraformaldehyde. The fixed tissues were embedded in OCT compound (Miles Scientific) and snap-frozen in liquid nitrogen for fluorescence microscopy. After this preliminary study to evaluate the incorporation of the cells into myocardial neovascularization, the therapeutic potential of CD34+ MNCs in myocardial ischemia was examined. Ten minutes after the LAD had been ligated, 105 human CD34+ MNCs in 100 µL of PBS (n=6), 105 human CD34- MNCs in 100 µL of PBS (n=6), or 100 µL of PBS (n=7) were injected into the myocardium as described above.

Physiological Assessment of LV Function and Ischemia
In the rat study, transthoracic echocardiography (SONOS 5500, Agilent Technologies) was performed to evaluate LV function 2 days before (baseline) and 4 weeks after myocardial ischemia. LV dimensions in end diastole (LVDd) and end systole (LVDs), fractional shortening (FS), and LV regional wall motion score11 were examined.

In the swine study, transthoracic echocardiography (SONOS 5500), selective coronary angiography, and NOGA LV electromechanical mapping were performed 4 weeks after constrictor placement (just before injection of cells or PBS) and 4 weeks after the injections. LV ejection fraction was quantified by a computerized analysis system using a proprietary software package in the echo unit12,13 in the LV short-axis view at the mid–papillary muscle level. Collateral flow to the LCx territory was graded angiographically in a blinded manner by use of the Rentrop scoring system.14 The area of ischemia was quantified by NOGA mapping as previously described.15

All data were evaluated by blinded observers (echocardiography by Y.-S.Y., coronary angiography by J.-I.Y., and postprocessing analysis of the NOGA mapping by C.M.).

Histological Assessment of Animals Receiving Transplants
Both the rats and swine were killed 4 weeks after treatment. At necropsy, rat hearts were sliced in a bread-loaf manner into 8 transverse sections from apex to base and fixed with 100% methanol. To elucidate the severity of myocardial fibrosis, elastic tissue–trichrome staining was performed on paraffin-embedded sections from each tissue block, and the percentage area of fibrosis was calculated. Immunohistochemical staining with antibody prepared against the EC marker isolectin B4 (Vector Laboratories) was performed, and capillary density was evaluated by histological examination of 5 randomly selected fields of tissue sections recovered from segments of LV myocardium subserved by the occluded LAD. Capillaries were recognized as tubular structures positive for isolectin B4. Immunohistochemical staining for the human-specific EC marker Ulex europaeus lectin type 1 (UEA-1 lectin) (Vector Laboratories) was also performed to identify transplanted human MNCs that had differentiated into mature ECs in the ischemic myocardium.

At necropsy, swine hearts were also sliced in a bread-loaf manner into 4 transverse sections from apex to base, and each section was separated into anterior, lateral, and posterior LV free wall; interventricular septum; and right ventricular free wall. All tissues obtained from each portion were fixed with 100% methanol. Immunohistochemistry for isolectin B4 was also performed to evaluate capillary density in the ischemic myocardium identified by NOGA mapping.

All morphometric studies were performed by 2 examiners (H.M. and A.H.) who were blinded to treatment.

Statistical Analysis
All values were expressed as mean±SEM. Student’s paired t test was performed for comparison of data before and after treatment. ANOVA was performed to compare data among 3 groups. A probability value of P<0.05 was considered to denote statistical significance.


*    Results
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Transplanted Autologous Swine EPCs Attenuate Chronic Myocardial Ischemia
Ischemic area determined by NOGA mapping before transplantation was not significantly different between the NA/CD31+, NA/CD31-, and PBS groups. A decrease in the size of the ischemic area was observed only after NA/CD31+ transplantation (before, 27.3±8.5%; after, 12.3±6.3%; P=0.0034), whereas the zone of ischemia increased in size after NA/CD31- or PBS injection. Similarly, the change in percentage ischemic area after transplantation was significantly improved only in the CD31+ group (P=0.0017 versus NA/CD31- group and P=0.038 versus PBS group) (Figure 1).



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Figure 1. a, Representative findings of NOGA electromechanical mapping before (top) and 4 weeks after (bottom) NA/CD31+ MNC transplantation. Brown dots in pretreatment map show sites of cell transplantation. Red area on pretreatment linear local shortening map (top right) indicates area of decreased wall motion in lateral wall of left ventricle, consistent with ischemia in territory of LCx. Four weeks after local CD31+ cell transplantation, this area of ischemia is no longer evident (bottom right). b, Representative findings of NOGA electromechanical mapping before and 4 weeks after NA/CD31- MNCs transplantation. Area of ischemia on pretreatment map (top right) is unchanged or slightly increased 4 weeks after local transplantation of CD31- cells. c, Representative findings of NOGA electromechanical mapping before and 4 weeks after PBS injection reveal findings similar to those in CD31- transplant animals, with no improvement in ischemic area. d, Change in percentage ischemic area during 4 weeks after treatment. NA/CD31+, swine receiving NA/CD31+ MNCs; NA/CD31-, swine receiving NA/CD31- MNCs. *P<0.05; **P<0.01.

Transplanted Autologous Swine EPCs Enhance Neovascularization
Selective left coronary angiography was performed to evaluate collateral development before and after transplantation in the swine study. The mean value of the Rentrop score of collateral development to the LCx territory at baseline was 0.6±0.4 in the NA/CD31+ group, 1.1±0.4 in the NA/CD31- group, and 1.1±0.3 in the PBS group (P=NS). Rentrop scoring was improved significantly only after NA/CD31+ transplantation (0.6±0.4 versus 2.0±0.4, P=0.02) and not after NA/CD31- or PBS injection. Similarly, the change in the Rentrop score was significantly greater in the NA/CD31+ group than in either the NA/CD31- or PBS groups (P=0.002 versus NA/CD31- MNCs and P=0.006 versus PBS) (Figure 2).



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Figure 2. a, Representative left coronary angiographic findings in swine before and 4 weeks after cell transplantation. Well-developed collaterals (arrows) to LCx were observed in NA/CD31+ MNC group, resulting in complete opacification of LCx and its branches. b, Improvement of Rentrop angiographic score of collateral development after transplantation of NA/CD31+ MNCs, NA/CD31- MNCs, or PBS. **P<0.01.

Histochemical staining of isolectin B4 was performed to identify capillaries in ischemic myocardium 4 weeks after cell transplantation. Capillary density was significantly greater in the NA/CD31+ group than in the NA/CD31- and PBS groups (P=0.0033 versus NA/CD31- MNCs and P=0.0004 versus PBS). Capillary density in the NA/CD31- group was similar to that in the PBS group (Figure 3, a and b).



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Figure 3. a, Representative immunohistochemical findings for isolectin B4 in swine ischemic myocardium 4 weeks after cell transplantation. b, Capillary density in swine ischemic myocardium 4 weeks after transplantation. **P<0.01; ***P<0.001. c, Echocardiographic LV ejection fraction (EF) before and 4 weeks after intramyocardial cell transplantation in swine with chronic myocardial ischemia. Circle, pigs receiving NA/CD31+ MNCs; square, pigs receiving NA/CD31- MNCs; triangle, pigs receiving PBS. d, Representative fluorescence microscopic findings of swine ischemic myocardium 28 days after cell transplantation. Red (DiI) fluorescence marks all autologously transplanted cells; green fluorescence indicates BS-1 lectin binding, identifying ECs. Therefore, yellow fluorescence marks double-positive cells, ie, cells harvested from systemic circulation, that were autologously transplanted into myocardium and now express a marker of endothelial phenotype. A majority of transplanted NA/CD31+ MNCs differentiated into EC lineage in vivo, indicated by high percentage of double-positive (yellow) cells (arrows) in 2 left panels. In contrast, most of transplanted NA/CD31- MNCs are positive only for ex vivo DiI label and negative for endothelial phenotype (arrowheads). Double-positive cells were rarely observed in CD31- transplanted animals.

Transplanted Autologous Swine EPCs Improve LV Function
LV ejection fraction measured by echocardiography in the NA/CD31+ group was similar to that in the NA/CD31- and PBS groups 4 weeks after constrictor placement (Figure 3c). However, LV ejection fraction improved significantly only after NA/CD31+ transplantation (P=0.0037) and not after NA/CD31- or PBS injection. LV ejection fraction 4 weeks after transplantation was significantly greater in the NA/CD31+ group than in the NA/CD31- and PBS groups (P=0.0018 versus NA/CD31- and P=0.0017 versus PBS) (Figure 3c).

Swine EPCs Differentiate Into Endothelial Lineage After Catheter-Based Injection in Vivo
To examine in vivo differentiation of swine autologous EPCs after transplantation into ischemic myocardium, DiI-labeled NA/CD31+ or NA/CD31- MNCs were injected into the lateral LV wall 4 weeks after constrictor placement. Four weeks after transplantation, the majority of NA/CD31+ MNCs were positive for BS-1 lectin in the ischemic myocardium. In contrast, transplanted NA/CD31- MNCs positive for BS-1 lectin were rarely observed in the ischemic myocardium (Figure 3d).

Transplanted Human EPCs Enhance Neovascularization and Inhibit Myocardial Fibrosis
In the rat study, capillary density was significantly greater in the CD34+ group than in the CD34- and PBS groups (P=0.003 versus CD34- MNCs and P=0.003 versus PBS). Capillary density in the CD34- group was not significantly different from that in the PBS group (Figure 4, a and b). Elastic tissue–trichrome staining was performed to identify LV fibrosis after myocardial ischemia. The fibrotic area was significantly smaller in the CD34+ group than in either the CD34- or PBS group (P=0.001 versus CD34- and P=0.01 versus PBS) (Figure 5, a through d).



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Figure 4. a, Representative immunohistochemical findings for isolectin B4 in ischemic myocardium of nude rats 4 weeks after cell transplantation. b, Capillary density in rat ischemic myocardium 4 weeks after cell transplantation. **P<0.01.



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Figure 5. a through c, Representative elastic tissue–trichrome–stained sections from nude rats 4 weeks after receiving CD34+ MNCs (a), CD34- MNCs (b), and PBS (c). d, LV fibrosis was significantly reduced in CD34+ MNC–treated group compared with CD34- MNCs (*P<0.05) or PBS group (**P<0.01). e through h, Echocardiographic parameters 4 weeks after cell transplantation in nude rats with myocardial ischemia. LV dilatation was reduced (f), and fractional shortening (g) and regional wall motion scores (h) are significantly improved in CD34+ group compared with CD34- and PBS-treated animals. *P<0.05; **P<0.01.

Transplanted Human EPCs Preserve LV Function
In the rat study, baseline LVDd, LVDs, FS, and regional wall motion score were similar between rats receiving human CD34+ MNCs, rats receiving CD34- MNCs, and rats receiving PBS. In all groups, all echocardiographic parameters worsened significantly 4 weeks after induction of myocardial ischemia (P<0.01 in all groups). Echocardiography performed 4 weeks after treatment revealed that LVDd was similar among the 3 treatment groups (Figure 5e). However, LVDs 4 weeks after ischemia was significantly smaller (P=0.013 versus CD34- MNCs and P=0.005 versus PBS) (Figure 5f), FS was significantly greater (P=0.007 versus CD34- MNCs and P=0.001 versus PBS) (Figure 5g), and regional wall motion score was significantly better (P=0.005 versus CD34- MNCs and P=0.0002 versus PBS) (Figure 5h) in rats receiving CD34+ MNCs compared with those treated with CD34- MNCs or PBS. LVDs, FS, and regional wall motion score 4 weeks after transplantation in the CD34- MNCs group were not significantly different from those in the PBS group (Figure 5, f through h).

Transplanted Human EPCs Incorporate Into Foci of Myocardial Neovascularization and Differentiate Into Mature ECs
Both Di-I labeled human CD34+ MNCs (EPC-enriched fraction) and CD34- MNCs (EPC-poor fraction) were distributed principally in the ischemic area of the rat myocardium. However, the number of cells incorporated into tubular structures consistent with neovasculature was much greater in rats receiving CD34+ MNCs than in those in which CD34- MNCs were transplanted (Figure 6a).



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Figure 6. a, Representative fluorescence microscopic findings of ischemic myocardium of nude rats 10 days after cell transplantation. Red fluorescence indicates DiI labeling of transplanted human cells, and green fluorescence indicates BS-1 lectin, a marker for rat ECs. Transplanted cells with tube-like structures (arrows) were observed frequently in CD34+ MNCs group (left) and were rarely seen in CD34- MNCs group (right). b, Representative findings of immunohistochemical staining for UEA-1 lectin (human-specific EC marker) in ischemic myocardium of nude rats 28 days after cell transplantation. UEA-1 lectin-positive mature ECs (arrows) were observed more frequently in CD34+ group than in CD34- group.

Differentiated human ECs derived from transplanted MNCs were frequently identified by UEA-1 lectin staining in the vasculature of the ischemic myocardium in rats receiving CD34+ MNCs. In contrast, mature human ECs were rarely identified in the ischemic myocardium of rats receiving CD34- MNCs (Figure 6b). Thus, locally transplanted human EPCs were incorporated into foci of neovascularization and differentiated into mature ECs in ischemic myocardium.


*    Discussion
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up arrowIntroduction
up arrowMethods
up arrowResults
*Discussion
down arrowReferences
 
In the present study, we demonstrate the therapeutic potential and technical feasibility of percutaneous, intramyocardial transplantation of autologous EPCs in the setting of chronic myocardial ischemia. This strategy was designed to overcome the 2 inherent limitations of previous approaches that would prevent application in humans. First, the requirement for a large number of EPCs was avoided by delivering the cells directly to the ischemic myocardium with the use of a novel, real-time ischemia mapping system. Second, the issue of immunologic compatibility was resolved by the use of autologous cells. Although transplantation of autologous cells, such as bone marrow MNCs16 or skeletal myoblasts,17 has been reported, the present study is the first to elucidate the therapeutic potential of autologous EPC transplantation.

Catheter-based, percutaneous intramyocardial transplantation of swine EPCs resulted in histological, angiographic, and functional evidence of enhanced neovascularization of ischemic myocardium. The incorporation of transplanted EPCs into the neovasculature was documented in pilot studies using labeled NA/CD31+ cells. Increased vascularity of the myocardium was observed only in animals in which EPCs were delivered. The notion that inflammation is induced either by needle injury or trauma resulting from injection of cells is completely dispelled by these data.

The porcine model of chronic myocardial ischemia was chosen for these preclinical studies to evaluate the strategy of local delivery via the NOGA injection catheter. Although CD34+ MNCs would be used in future clinical situations, anti-swine CD34 antibody is not available. Therefore, we performed cell selection with anti-swine CD31 antibody instead. To complement these studies and verify that selected CD34 cells could also yield similar clinical benefit, we transplanted freshly isolated human CD34+ cells into the myocardium in a nude rat model of myocardial ischemia. The locally transplanted CD34+ cells incorporated into foci of myocardial neovascularization, differentiated into mature ECs, enhanced vascularity in the ischemic myocardium, preserved LV systolic function, and inhibited LV fibrosis. Once again, these benefits were absent after injection of negatively selected cells or PBS, providing further evidence against the "injury hypothesis" of neovascularization. These positive outcomes are similar to those in previous studies involving intravenous EPC transplantation.5,6 However, the number of transplanted human CD34+ MNCs in this study was 20 times less than that in these previous studies of intravenous transplantation,6 providing a practical solution to the requirement for large numbers of cells in these previous investigations.

These data suggest that percutaneous delivery of autologous, freshly isolated EPCs targeted to sites of ischemia may represent a practical strategy for revascularization of patients with chronic myocardial ischemia.


*    Acknowledgments
 
This work was supported by National Institutes of Health grants HL-63414, HL-57516, and HL-53354. The assistance of Mickey Neely and Tokiko Shiojima in the preparation of the manuscript is gratefully acknowledged.


*    Footnotes
 
{dagger} Deceased. Back

Received June 26, 2002; revision received October 8, 2002; accepted October 8, 2002.


*    References
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up arrowAbstract
up arrowIntroduction
up arrowMethods
up arrowResults
up arrowDiscussion
*References
 
1. Asahara T, Murohara T, Sullivan A, et al. Isolation of putative progenitor endothelial cells for angiogenesis. Science. 1997; 275: 964–967.[Abstract/Free Full Text]

2. Shi Q, Rafii S, Wu MH-D, et al. Evidence for circulating bone marrow-derived endothelial cells. Blood. 1998; 92: 362–367.[Abstract/Free Full Text]

3. Asahara T, Masuda H, Takahashi T, et al. Bone marrow origin of endothelial progenitor cells responsible for postnatal vasculogenesis in physiological and pathological neovascularization. Circ Res. 1999; 85: 221–228.[Abstract/Free Full Text]

4. Kalka C, Masuda H, Takahashi T, et al. Transplantation of ex vivo expanded endothelial progenitor cells for therapeutic neovascularization. Proc Natl Acad Sci U S A. 2000; 97: 3422–3427.[Abstract/Free Full Text]

5. Kawamoto A, Gwon HC, Iwaguro H, et al. Therapeutic potential of ex vivo expanded endothelial progenitor cells for myocardial ischemia. Circulation. 2001; 103: 634–637.[Abstract/Free Full Text]

6. Kocher AA, Schuster MD, Szabolcs MJ, et al. Neovascularization of ischemic myocardium by human bone-marrow-derived angioblasts prevents cardiomyocyte apoptosis, reduces remodeling and improves cardiac function. Nat Med. 2001; 7: 430–436.[CrossRef][Medline] [Order article via Infotrieve]

7. Fuchs S, Baffour R, Zhou YF, et al. Transendocardial delivery of autologous bone marrow enhances collateral perfusion and regional function in pigs with chronic experimental myocardial ischemia. J Am Coll Cardiol. 2001; 37: 1726–1732.[Abstract/Free Full Text]

8. Ben-Haim SA, Osadchy D, Schuster I, et al. Nonfluoroscopic, in vivo navigation and mapping technology. Nat Med. 1996; 2: 1393–1395.[CrossRef][Medline] [Order article via Infotrieve]

9. Vale PR, Losordo DW, Tkebuchava T, et al. Catheter-based myocardial gene transfer utilizing nonfluoroscopic electromechanical left ventricular mapping. J Am Coll Cardiol. 1999; 34: 246–254.[Abstract/Free Full Text]

10. Botker HE, Lassen JF, Hermansen F, et al. Electromechanical mapping for detection of myocardial viability in patients with ischemic cardiomyopathy. Circulation. 2001; 103: 1631–1637.[Abstract/Free Full Text]

11. Schiller NB, Shah PM, Crawford M, et al. Recommendations for quantitation of the left ventricle by two-dimensional echocardiography. American Society of Echocardiography Committee on Standards, Subcommittee on Quantitation of Two-Dimensional Echocardiograms. J Am Soc Echocardiogr. 1989; 2: 358–367.[Medline] [Order article via Infotrieve]

12. Vandenberg BF, Lindower PD, Lewis J, et al. Reproducibility of left ventricular measurements with acoustic quantification: the influence of training. Echocardiography. 2000; 17: 631–637.[CrossRef][Medline] [Order article via Infotrieve]

13. Tardif JC, Cao QL, Pandian NG, et al. Determination of cardiac output using acoustic quantification in critically ill patients. Am J Cardiol. 1994; 74: 810–813.[CrossRef][Medline] [Order article via Infotrieve]

14. Rentrop KP, Cohen M, Blanke H, et al. Changes in collateral channel filling immediately after controlled coronary artery occlusion by an angioplasty balloon in human subjects. J Am Coll Cardiol. 1985; 5: 587–592.[Abstract]

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16. Kamihata H, Matsubara H, Nishiue T, et al. Implantation of bone marrow mononuclear cells into ischemic myocardium enhances collateral perfusion and regional function via side supply of angioblasts, angiogenic ligands, and cytokines. Circulation. 2001; 104: 1046–1052.[Abstract/Free Full Text]

17. Suzuki K, Murtuza B, Suzuki N, et al. Intracoronary infusion of skeletal myoblasts improves cardiac function in doxorubicin-induced heart failure. Circulation. 2001; 104 (suppl I): I-213–I-217.[Medline] [Order article via Infotrieve]




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DMMHome page
K. D. Boudoulas and A. K. Hatzopoulos
Cardiac repair and regeneration: the Rubik's cube of cell therapy for heart disease
Dis. Model. Mech., July 1, 2009; 2(7-8): 344 - 358.
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JNMHome page
T. Higuchi, M. Anton, K. Dumler, S. Seidl, J. Pelisek, A. Saraste, A. Welling, F. Hofmann, R. A.J. Oostendorp, B. Gansbacher, et al.
Combined Reporter Gene PET and Iron Oxide MRI for Monitoring Survival and Localization of Transplanted Cells in the Rat Heart
J. Nucl. Med., July 1, 2009; 50(7): 1088 - 1094.
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Vasc MedHome page
D. P Sieveking and M. K. Ng
Cell therapies for therapeutic angiogenesis: back to the bench
Vascular Medicine, May 1, 2009; 14(2): 153 - 166.
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Cardiovasc ResHome page
U. Landmesser, K. C. Wollert, and H. Drexler
Potential novel pharmacological therapies for myocardial remodelling
Cardiovasc Res, February 15, 2009; 81(3): 519 - 527.
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Ther Adv Cardiovasc DisHome page
K. Yamahara and H. Itoh
Potential use of endothelial progenitor cells for regeneration of the vasculature
Therapeutic Advances in Cardiovascular Disease, February 1, 2009; 3(1): 17 - 27.
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Eur Heart JHome page
M. Korf-Klingebiel, T. Kempf, T. Sauer, E. Brinkmann, P. Fischer, G. P. Meyer, A. Ganser, H. Drexler, and K. C. Wollert
Bone marrow cells are a rich source of growth factors and cytokines: implications for cell therapy trials after myocardial infarction
Eur. Heart J., December 1, 2008; 29(23): 2851 - 2858.
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M. Gnecchi, Z. Zhang, A. Ni, and V. J. Dzau
Paracrine Mechanisms in Adult Stem Cell Signaling and Therapy
Circ. Res., November 21, 2008; 103(11): 1204 - 1219.
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T. Ziebart, C.-H. Yoon, T. Trepels, A. Wietelmann, T. Braun, F. Kiessling, S. Stein, M. Grez, C. Ihling, M. Muhly-Reinholz, et al.
Sustained Persistence of Transplanted Proangiogenic Cells Contributes to Neovascularization and Cardiac Function After Ischemia
Circ. Res., November 21, 2008; 103(11): 1327 - 1334.
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P. Korpisalo, H. Karvinen, T. T. Rissanen, J. Kilpijoki, V. Marjomaki, P. Baluk, D. M. McDonald, Y. Cao, U. Eriksson, K. Alitalo, et al.
Vascular Endothelial Growth Factor-A and Platelet-Derived Growth Factor-B Combination Gene Therapy Prolongs Angiogenic Effects via Recruitment of Interstitial Mononuclear Cells and Paracrine Effects Rather Than Improved Pericyte Coverage of Angiogenic Vessels
Circ. Res., November 7, 2008; 103(10): 1092 - 1099.
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Y. Zhang, S. Thorn, J. N. DaSilva, M. Lamoureux, R. A. deKemp, R. S. Beanlands, M. Ruel, and E. J. Suuronen
Collagen-Based Matrices Improve the Delivery of Transplanted Circulating Progenitor Cells: Development and Demonstration by Ex Vivo Radionuclide Cell Labeling and In Vivo Tracking With Positron-Emission Tomography
Circ Cardiovasc Imaging, November 1, 2008; 1(3): 197 - 204.
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Eur J Heart FailHome page
Z. Sun, J. Wu, H. Fujii, J. Wu, S.-H. Li, S. Porozov, A. Belleli, V. Fulga, Y. Porat, and R.-K. Li
Human angiogenic cell precursors restore function in the infarcted rat heart: A comparison of cell delivery routes
Eur J Heart Fail, June 1, 2008; 10(6): 525 - 533.
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ANGIOLOGYHome page
Y. Tayyareci, M. Sezer, B. Umman, S. Besisik, A. Mudun, Y. Sanli, A. Oncul, N. Gurses, D. Sargin, M. Meric, et al.
Intracoronary Autologous Bone Marrow-Derived Mononuclear Cell Transplantation Improves Coronary Collateral Vessel Formation and Recruitment Capacity in Patients With Ischemic Cardiomyopathy: A Combined Hemodynamic and Scintigraphic Approach
Angiology, May 1, 2008; 59(2): 145 - 155.
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J Am Coll CardiolHome page
S. C. Dudley Jr and D. Simpson
An Imperfect Syllogism: Granulocyte Colony-Stimulating Factor Mobilization and Cardiac Regeneration
J. Am. Coll. Cardiol., April 15, 2008; 51(15): 1438 - 1439.
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Arterioscler. Thromb. Vasc. Bio.Home page
S. Dimmeler, J. Burchfield, and A. M. Zeiher
Cell-Based Therapy of Myocardial Infarction
Arterioscler Thromb Vasc Biol, February 1, 2008; 28(2): 208 - 216.
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JEMHome page
H.-J. Cho, N. Lee, J. Y. Lee, Y. J. Choi, M. Ii, A. Wecker, J.-O. Jeong, C. Curry, G. Qin, and Y.-s. Yoon
Role of host tissues for sustained humoral effects after endothelial progenitor cell transplantation into the ischemic heart
J. Exp. Med., December 24, 2007; 204(13): 3257 - 3269.
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J. Am. Soc. Nephrol.Home page
J. Tongers and D. W. Losordo
Frontiers in Nephrology: The Evolving Therapeutic Applications of Endothelial Progenitor Cells
J. Am. Soc. Nephrol., November 1, 2007; 18(11): 2843 - 2852.
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J Am Coll CardiolHome page
C.-D. Kan, S.-H. Li, R. D. Weisel, S. Zhang, and R.-K. Li
Recipient Age Determines the Cardiac Functional Improvement Achieved by Skeletal Myoblast Transplantation
J. Am. Coll. Cardiol., September 11, 2007; 50(11): 1086 - 1092.
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Eur J Heart FailHome page
H.-F. Tse, C.-W. Siu, S.-G. Zhu, L. Songyan, Q.-Y. Zhang, W.-H. Lai, Y.-L. Kwong, J. Nicholls, and C.-P. Lau
Paracrine effects of direct intramyocardial implantation of bone marrow derived cells to enhance neovascularization in chronic ischaemic myocardium
Eur J Heart Fail, August 1, 2007; 9(8): 747 - 753.
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CirculationHome page
D. W. Losordo, R. A. Schatz, C. J. White, J. E. Udelson, V. Veereshwarayya, M. Durgin, K. K. Poh, R. Weinstein, M. Kearney, M. Chaudhry, et al.
Intramyocardial Transplantation of Autologous CD34+ Stem Cells for Intractable Angina: A Phase I/IIa Double-Blind, Randomized Controlled Trial
Circulation, June 26, 2007; 115(25): 3165 - 3172.
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Arterioscler. Thromb. Vasc. Bio.Home page
H. Iwasaki, K. Fukushima, A. Kawamoto, K. Umetani, A. Oyamada, S. Hayashi, T. Matsumoto, M. Ishikawa, T. Shibata, H. Nishimura, et al.
Synchrotron Radiation Coronary Microangiography for Morphometric and Physiological Evaluation of Myocardial Neovascularization Induced by Endothelial Progenitor Cell Transplantation
Arterioscler Thromb Vasc Biol, June 1, 2007; 27(6): 1326 - 1333.
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CirculationHome page
S. Fukushima, A. Varela-Carver, S. R. Coppen, K. Yamahara, L. E. Felkin, J. Lee, P. J.R. Barton, C. M.N. Terracciano, M. H. Yacoub, and K. Suzuki
Direct Intramyocardial But Not Intracoronary Injection of Bone Marrow Cells Induces Ventricular Arrhythmias in a Rat Chronic Ischemic Heart Failure Model
Circulation, May 1, 2007; 115(17): 2254 - 2261.
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haematolHome page
Y. Oki and A. Younes
Endothelial progenitor cells in non-Hodgkin's lymphoma
Haematologica, April 1, 2007; 92(4): 433 - 434.
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CirculationHome page
S. T. Wall, J. C. Walker, K. E. Healy, M. B. Ratcliffe, and J. M. Guccione
Theoretical Impact of the Injection of Material Into the Myocardium: A Finite Element Model Simulation
Circulation, December 12, 2006; 114(24): 2627 - 2635.
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CirculationHome page
R. de Silva, L. F. Gutierrez, A. N. Raval, E. R. McVeigh, C. Ozturk, and R. J. Lederman
X-Ray Fused With Magnetic Resonance Imaging (XFM) to Target Endomyocardial Injections: Validation in a Swine Model of Myocardial Infarction
Circulation, November 28, 2006; 114(22): 2342 - 2350.
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CirculationHome page
A. Kawamoto, H. Iwasaki, K. Kusano, T. Murayama, A. Oyamada, M. Silver, C. Hulbert, M. Gavin, A. Hanley, H. Ma, et al.
CD34-Positive Cells Exhibit Increased Potency and Safety for Therapeutic Neovascularization After Myocardial Infarction Compared With Total Mononuclear Cells
Circulation, November 14, 2006; 114(20): 2163 - 2169.
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Vasc MedHome page
R. G. Shaffer, S. Greene, A. Arshi, G. Supple, A. Bantly, J. S Moores, M. S Parmacek, and E. R Mohler III
Effect of acute exercise on endothelial progenitor cells in patients with peripheral arterial disease
Vascular Medicine, November 1, 2006; 11(4): 219 - 226.
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J Am Coll CardiolHome page
I. Ben-Dor, S. Fuchs, and R. Kornowski
Potential Hazards and Technical Considerations Associated With Myocardial Cell Transplantation Protocols for Ischemic Myocardial Syndrome
J. Am. Coll. Cardiol., October 17, 2006; 48(8): 1519 - 1526.
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H. Guven, R. M. Shepherd, R. G. Bach, B. J. Capoccia, and D. C. Link
The Number of Endothelial Progenitor Cell Colonies in the Blood Is Increased in Patients With Angiographically Significant Coronary Artery Disease
J. Am. Coll. Cardiol., October 17, 2006; 48(8): 1579 - 1587.
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S. Wassmann, N. Werner, T. Czech, and G. Nickenig
Improvement of Endothelial Function by Systemic Transfusion of Vascular Progenitor Cells
Circ. Res., October 13, 2006; 99(8): E74 - E83.
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T. Matsumoto, A. Kawamoto, R. Kuroda, M. Ishikawa, Y. Mifune, H. Iwasaki, M. Miwa, M. Horii, S. Hayashi, A. Oyamada, et al.
Therapeutic Potential of Vasculogenesis and Osteogenesis Promoted by Peripheral Blood CD34-Positive Cells for Functional Bone Healing
Am. J. Pathol., October 1, 2006; 169(4): 1440 - 1457.
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Arterioscler. Thromb. Vasc. Bio.Home page
T. Ishikawa, M. Eguchi, M. Wada, Y. Iwami, K. Tono, H. Iwaguro, H. Masuda, T. Tamaki, and T. Asahara
Establishment of a Functionally Active Collagen-Binding Vascular Endothelial Growth Factor Fusion Protein In Situ
Arterioscler Thromb Vasc Biol, September 1, 2006; 26(9): 1998 - 2004.
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Y. Wu, J. E. Ip, J. Huang, L. Zhang, K. Matsushita, C.-C. Liew, R. E. Pratt, and V. J. Dzau
Essential Role of ICAM-1/CD18 in Mediating EPC Recruitment, Angiogenesis, and Repair to the Infarcted Myocardium
Circ. Res., August 4, 2006; 99(3): 315 - 322.
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Cardiovasc ResHome page
S. M. Davidson and D. M. Yellon
Dissecting out the mechanism of cardioprotection by endogenous erthyropoietin using genetic engineering
Cardiovasc Res, August 1, 2006; 71(3): 408 - 410.
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Cardiovasc ResHome page
Y. Misao, G. Takemura, M. Arai, T. Ohno, H. Onogi, T. Takahashi, S. Minatoguchi, T. Fujiwara, and H. Fujiwara
Importance of recruitment of bone marrow-derived CXCR4+ cells in post-infarct cardiac repair mediated by G-CSF
Cardiovasc Res, August 1, 2006; 71(3): 455 - 465.
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J Am Coll CardiolHome page
P. van der Meer and E. Lipsic
Erythropoietin: Repair of the Failing Heart
J. Am. Coll. Cardiol., July 4, 2006; 48(1): 185 - 186.
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Arterioscler. Thromb. Vasc. Bio.Home page
H.C. de Boer, C. Verseyden, L.H. Ulfman, J.J. Zwaginga, I. Bot, E.A. Biessen, T.J. Rabelink, and A.J. van Zonneveld
Fibrin and Activated Platelets Cooperatively Guide Stem Cells to a Vascular Injury and Promote Differentiation Towards an Endothelial Cell Phenotype
Arterioscler Thromb Vasc Biol, July 1, 2006; 26(7): 1653 - 1659.
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Circ. Res.Home page
H.-J. Cho and Y.-s. Yoon
Synergism of Hematopoietic Cytokines for Infarct Repair
Circ. Res., April 28, 2006; 98(8): 990 - 992.
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J. J. Gavira, J. Herreros, A. Perez, M. J. Garcia-Velloso, J. Barba, F. Martin-Herrero, C. Canizo, A. Martin-Arnau, J. M. Marti-Climent, M. Hernandez, et al.
Autologous skeletal myoblast transplantation in patients with nonacute myocardial infarction: 1-year follow-up
J. Thorac. Cardiovasc. Surg., April 1, 2006; 131(4): 799 - 804.
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JNMHome page
S. L.M.A. Beeres, J. J. Bax, P. Dibbets, M. P.M. Stokkel, K. Zeppenfeld, W. E. Fibbe, E. E. van der Wall, M. J. Schalij, and D. E. Atsma
Effect of Intramyocardial Injection of Autologous Bone Marrow-Derived Mononuclear Cells on Perfusion, Function, and Viability in Patients with Drug-Refractory Chronic Ischemia
J. Nucl. Med., April 1, 2006; 47(4): 574 - 580.
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Eur. J. Cardiothorac. Surg.Home page
S. A. de Oliveira, L. H. W. Gowdak, G. Buckberg, J. E. Krieger, and the RESTORE Group
Cell biology, MRI and geometry: insight into a microscopic/macroscopic marriage
Eur. J. Cardiothorac. Surg., April 1, 2006; 29(Suppl_1): S259 - S265.
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CirculationHome page
F. G.P. Welt and D. W. Losordo
Cell Therapy for Acute Myocardial Infarction: Curb Your Enthusiasm?
Circulation, March 14, 2006; 113(10): 1272 - 1274.
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CirculationHome page
H. Iwasaki, A. Kawamoto, M. Ishikawa, A. Oyamada, S. Nakamori, H. Nishimura, K. Sadamoto, M. Horii, T. Matsumoto, S. Murasawa, et al.
Dose-Dependent Contribution of CD34-Positive Cell Transplantation to Concurrent Vasculogenesis and Cardiomyogenesis for Functional Regenerative Recovery After Myocardial Infarction
Circulation, March 14, 2006; 113(10): 1311 - 1325.
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BloodHome page
J. Glod, D. Kobiler, M. Noel, R. Koneru, S. Lehrer, D. Medina, D. Maric, and H. A. Fine
Monocytes form a vascular barrier and participate in vessel repair after brain injury
Blood, February 1, 2006; 107(3): 940 - 946.
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Arterioscler. Thromb. Vasc. Bio.Home page
J. George, A. Afek, A. Abashidze, H. Shmilovich, V. Deutsch, J. Kopolovich, H. Miller, and G. Keren
Transfer of Endothelial Progenitor and Bone Marrow Cells Influences Atherosclerotic Plaque Size and Composition in Apolipoprotein E Knockout Mice
Arterioscler Thromb Vasc Biol, December 1, 2005; 25(12): 2636 - 2641.
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Eur. J. Cardiothorac. Surg.Home page
S. Sartore, M. Lenzi, A. Angelini, A. Chiavegato, L. Gasparotto, P. D. Coppi, R. Bianco, and G. Gerosa
Amniotic mesenchymal cells autotransplanted in a porcine model of cardiac ischemia do not differentiate to cardiogenic phenotypes
Eur. J. Cardiothorac. Surg., November 1, 2005; 28(5): 677 - 684.
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Am. J. Physiol. Renal Physiol.Home page
C. T. Chan, S. H. Li, and S. Verma
Nocturnal hemodialysis is associated with restoration of impaired endothelial progenitor cell biology in end-stage renal disease
Am J Physiol Renal Physiol, October 1, 2005; 289(4): F679 - F684.
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CirculationHome page
H. Ince, M. Petzsch, H. D. Kleine, H. Eckard, T. Rehders, D. Burska, S. Kische, M. Freund, and C. A. Nienaber
Prevention of Left Ventricular Remodeling With Granulocyte Colony-Stimulating Factor After Acute Myocardial Infarction: Final 1-year Results of the Front-Integrated Revascularization and Stem Cell Liberation in Evolving Acute Myocardial Infarction by Granulocyte Colony-Stimulating Factor (FIRSTLINE-AMI) Trial
Circulation, August 30, 2005; 112(9_suppl): I-73 - I-80.
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Ann. Thorac. Surg.Home page
L. H. W. Gowdak, I. T. Schettert, C. E. Rochitte, L. A. F. Lisboa, L. A. O. Dallan, L. A. M. Cesar, J. E. Krieger, J. A. F. Ramires, and S. A. de Oliveira
Cell Therapy Plus Transmyocardial Laser Revascularization for Refractory Angina
Ann. Thorac. Surg., August 1, 2005; 80(2): 712 - 714.
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Eur. J. Cardiothorac. Surg.Home page
M. Siepe, C. Heilmann, P. von Samson, P. Menasche, and F. Beyersdorf
Stem cell research and cell transplantation for myocardial regeneration
Eur. J. Cardiothorac. Surg., August 1, 2005; 28(2): 318 - 324.
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HypertensionHome page
V. J. Dzau, M. Gnecchi, A. S. Pachori, F. Morello, and L. G. Melo
Therapeutic Potential of Endothelial Progenitor Cells in Cardiovascular Diseases
Hypertension, July 1, 2005; 46(1): 7 - 18.
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DiabetesHome page
K. Naruse, Y. Hamada, E. Nakashima, K. Kato, R. Mizubayashi, H. Kamiya, Y. Yuzawa, S. Matsuo, T. Murohara, T. Matsubara, et al.
Therapeutic Neovascularization Using Cord Blood-Derived Endothelial Progenitor Cells for Diabetic Neuropathy
Diabetes, June 1, 2005; 54(6): 1823 - 1828.
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CirculationHome page
M. Hofmann, K. C. Wollert, G. P. Meyer, A. Menke, L. Arseniev, B. Hertenstein, A. Ganser, W. H. Knapp, and H. Drexler
Monitoring of Bone Marrow Cell Homing Into the Infarcted Human Myocardium
Circulation, May 3, 2005; 111(17): 2198 - 2202.
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P. L Weissberg and A. Qasim
Stem cell therapy for myocardial repair
Heart, May 1, 2005; 91(5): 696 - 702.
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CirculationHome page
Y.-s. Yoon, S. Uchida, O. Masuo, M. Cejna, J.-S. Park, H.-c. Gwon, R. Kirchmair, F. Bahlman, D. Walter, C. Curry, et al.
Progressive Attenuation of Myocardial Vascular Endothelial Growth Factor Expression Is a Seminal Event in Diabetic Cardiomyopathy: Restoration of Microvascular Homeostasis and Recovery of Cardiac Function in Diabetic Cardiomyopathy After Replenishment of Local Vascular Endothelial Growth Factor
Circulation, April 26, 2005; 111(16): 2073 - 2085.
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HypertensionHome page
F. H. Bahlmann, K. de Groot, O. Mueller, B. Hertel, H. Haller, and D. Fliser
Stimulation of Endothelial Progenitor Cells: A New Putative Therapeutic Effect of Angiotensin II Receptor Antagonists
Hypertension, April 1, 2005; 45(4): 526 - 529.
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Journal of Renin-Angiotensin-Aldosterone SystemHome page
A. J Boyle, M. Schuster, P. Witkowski, Guosheng Xiang, T. Seki, K. Way, and S. Itescu
Additive effects of endothelial progenitor cells combined with ACE inhibition and {beta}-blockade on left ventricular function following acute myocardial infarction
Journal of Renin-Angiotensin-Aldosterone System, March 1, 2005; 6(1): 33 - 37.
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Circ. Res.Home page
K. C. Wollert and H. Drexler
Clinical Applications of Stem Cells for the Heart
Circ. Res., February 4, 2005; 96(2): 151 - 163.
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Eur. J. Cardiothorac. Surg.Home page
A. J. Rastan, T. Walther, M. Kostelka, J. Garbade, A. Schubert, A. Stein, S. Dhein, and F. W. Mohr
Morphological, electrophysiological and coupling characteristics of bone marrow-derived mononuclear cells--an in vitro-model
Eur. J. Cardiothorac. Surg., January 1, 2005; 27(1): 104 - 110.
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CirculationHome page
I. Spyridopoulos, J. Haendeler, C. Urbich, T. H. Brummendorf, H. Oh, M. D. Schneider, A. M. Zeiher, and S. Dimmeler
Statins Enhance Migratory Capacity by Upregulation of the Telomere Repeat-Binding Factor TRF2 in Endothelial Progenitor Cells
Circulation, November 9, 2004; 110(19): 3136 - 3142.
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Arterioscler. Thromb. Vasc. Bio.Home page
L. G. Melo, M. Gnecchi, A. S. Pachori, D. Kong, K. Wang, X. Liu, R. E. Pratt, and V. J. Dzau
Endothelium-Targeted Gene and Cell-Based Therapies for Cardiovascular Disease
Arterioscler Thromb Vasc Biol, October 1, 2004; 24(10): 1761 - 1774.
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CirculationHome page
A. Kawamoto, T. Murayama, K. Kusano, M. Ii, T. Tkebuchava, S. Shintani, A. Iwakura, I. Johnson, P. von Samson, A. Hanley, et al.
Synergistic Effect of Bone Marrow Mobilization and Vascular Endothelial Growth Factor-2 Gene Therapy in Myocardial Ischemia
Circulation, September 14, 2004; 110(11): 1398 - 1405.
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Eur Heart J SupplHome page
L.G Melo, M Gnecchi, A.S Pachori, K Wang, and V.J Dzau
Gene- and cell-based therapies for cardiovascular diseases: current status and future directions
Eur. Heart J. Suppl., September 1, 2004; 6(suppl_E): E24 - E35.
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Am. J. Physiol. Heart Circ. Physiol.Home page
R. Gulati, D. Jevremovic, T. A. Witt, L. S. Kleppe, R. G. Vile, A. Lerman, and R. D. Simari
Modulation of the vascular response to injury by autologous blood-derived outgrowth endothelial cells
Am J Physiol Heart Circ Physiol, August 1, 2004; 287(2): H512 - H517.
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J Am Coll CardiolHome page
S. Dimmeler and A. M. Zeiher
Wanted! The best cell for cardiac regeneration
J. Am. Coll. Cardiol., July 21, 2004; 44(2): 464 - 466.
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CirculationHome page
Y.-S. Yoon, J.-S. Park, T. Tkebuchava, C. Luedeman, and D. W. Losordo
Unexpected Severe Calcification After Transplantation of Bone Marrow Cells in Acute Myocardial Infarction
Circulation, June 29, 2004; 109(25): 3154 - 3157.
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Asian Cardiovasc. Thorac. Ann.Home page
L. Ye, H. K Haider, S.-J. Jiang, and E. K. Sim
Therapeutic Angiogenesis Using Vascular Endothelial Growth Factor
Asian Cardiovasc Thorac Ann, June 1, 2004; 12(2): 173 - 181.
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CirculationHome page
L. G. Melo, A. S. Pachori, D. Kong, M. Gnecchi, K. Wang, R. E. Pratt, and V. J. Dzau
Molecular and Cell-Based Therapies for Protection, Rescue, and Repair of Ischemic Myocardium: Reasons for Cautious Optimism
Circulation, May 25, 2004; 109(20): 2386 - 2393.
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L. G. MELO, A. S. PACHORI, D. KONG, M. GNECCHI, K. WANG, R. E. PRATT, and V. J. DZAU
Gene and cell-based therapies for heart disease
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V. Adams, K. Lenk, A. Linke, D. Lenz, S. Erbs, M. Sandri, A. Tarnok, S. Gielen, F. Emmrich, G. Schuler, et al.
Increase of Circulating Endothelial Progenitor Cells in Patients with Coronary Artery Disease After Exercise-Induced Ischemia
Arterioscler Thromb Vasc Biol, April 1, 2004; 24(4): 684 - 690.
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