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(Circulation. 2003;107:2085.)
© 2003 American Heart Association, Inc.

Brief Rapid Communications

Different Differentiation Kinetics of Vascular Progenitor Cells in Primate and Mouse Embryonic Stem Cells

Masakatsu Sone, MD; Hiroshi Itoh, MD, PhD; Jun Yamashita, MD, PhD; Takami Yurugi-Kobayashi, MD; Yutaka Suzuki, PhD; Yasushi Kondo, PhD; Akane Nonoguchi; Naoki Sawada, MD, PhD; Kenichi Yamahara, MD; Kazutoshi Miyashita, MD; Kwijun Park, MD; Masabumi Shibuya, MD, PhD; Shinji Nito, PhD; Shin-Ichi Nishikawa, MD, PhD; Kazuwa Nakao, MD, PhD

From the Department of Medicine and Clinical Science (M.S., H.I., T.Y.-K., A.N., N.S., K.Y., K.M., K.P., K.N.) and the Department of Molecular Genetics (J.Y., S.-I.N.), Kyoto University Graduate School of Medicine, Kyoto; the Discovery Research Laboratory, Tanabe Seiyaku Co, Ltd, Osaka (Y.S., Y.K., S.N.); the Department of Genetics, Institute of Medical Science, University of Tokyo, Tokyo (M.S.); and the Center for Developmental Biology, RIKEN, Kobe (S.-I.N.), Japan.

Correspondence to Hiroshi Itoh, MD, PhD, Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 Japan. E-mail hiito{at}kuhp.kyoto-u.ac.jp

Background— We demonstrated that vascular endothelial growth factor receptor 2 (VEGF-R2)-positive cells derived from mouse embryonic stem (ES) cells can differentiate into both endothelial cells and mural cells to suffice as vascular progenitor cells (VPCs). Here we examined whether VPCs occur in primate ES cells and investigated the differences in VPC differentiation kinetics between primate and mouse ES cells.

Methods and Results— In contrast to mouse ES cells, undifferentiated monkey ES cells expressed VEGF-R2. By culturing these undifferentiated ES cells for 4 days on OP9 feeder layer, VEGF-R2 expression disappeared, and then reappeared after 8 days of differentiation. We then isolated these VEGF-R2–positive and vascular endothelial cadherin (VEcadherin)-negative cells by flow cytometry sorting. Additional 5-day reculture of these VEGF-R2⁺ VEcadherin^- cells on OP9 feeder layer resulted in the appearance of platelet endothelial cell adhesion molecule-1 (PECAM1)-positive, VEcadherin-positive, endothelial nitric oxide synthase (eNOS)-positive endothelial cells. On a collagen IV-coated dish in the presence of serum, these cells differentiated into smooth muscle actin (SMA)-positive and calponin-positive mural cells (pericytes or vascular smooth muscle cells). Addition of 50ng/mL VEGF to the culture on a collagen IV-coated dish resulted in the appearance of PECAM1⁺ cells surrounded by SMA⁺ cells. In addition, these differentiated VEGF-R2⁺ cells can form tube-like structures in a 3-dimensional culture.

Conclusion— Our findings indicate that differentiation kinetics of VPCs derived from primate and mouse ES cells were different. Differentiated VEGF-R2⁺ VEcadherin^- cells can act as VPCs in primates. To seek the clinical potential of VPCs for vascular regeneration, investigations of primate ES cells are indispensable.

Key Words: angiogenesis • cells • endothelium • muscle, smooth • vessels

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