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(Circulation. 2002;106:273.)
© 2002 American Heart Association, Inc.

Basic Science Reports

Nitric Oxide Modulates Myocardial Oxygen Consumption in the Failing Heart

YingJie Chen, MD, PhD; Jay H. Traverse, MD; Ruisheng Du, PhD; MingXiao Hou, MD, PhD; Robert J. Bache, MD

From the Department of Medicine, Division of Cardiology, University of Minnesota Medical School, Minneapolis.

Correspondence to Robert J. Bache, MD, Department of Medicine, University of Minnesota Medical School, Mayo Mail Code 508, 420 Delaware St SE, Minneapolis, MN 55455. E-mail bache001{at}tc.umn.edu

	Abstract

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Background— Endogenous nitric oxide (NO) has been reported to inhibit oxygen consumption in the normal heart, so that nonselective inhibition of NO synthase (NOS) caused an increase of myocardial oxygen consumption (MO₂). Although endothelial NOS responses are depressed in congestive heart failure (CHF), inducible NOS (iNOS) may be expressed in failing myocardium.

Methods and Results— This study tested the hypothesis that NOS inhibition would increase MO₂ in the failing heart. CHF was produced in dogs by use of the rapid ventricular pacing model. In comparison with normal values, animals with CHF had reduced coronary blood flow and MO₂ at rest, with a blunted response to treadmill exercise. Selective iNOS inhibition with S-methylisothiourea (1.5 mg/kg IC) increased left ventricular systolic pressure and left ventricular dP/dt and caused an increase in MO₂ at rest and during exercise (P<0.05), with a parallel upward shift in the relationship between MO₂ and rate-pressure product. In contrast, S-methylisothiourea had no effect on MO₂ or coronary flow in normal animals, although nonselective NOS inhibition with N^G-nitro-L-arginine did cause an increase of MO₂ in normal and in CHF animals.

Conclusions— The results indicate that endogenous NO can modulate MO₂ in failing hearts, but unlike the normal heart, this NO appears to be produced, at least in part, by iNOS.

Key Words: metabolism • myocardium • blood flow • nitric oxide

	Introduction

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Nitric oxide (NO) can modulate mitochondrial respiration by competitive inhibition of oxygen at cytochrome oxidase.¹ Several investigators have reported that blockade of NO production with nonselective NO synthase (NOS) inhibitors leads to significant increases of myocardial oxygen consumption (MO₂) in the normal heart,^2,3 although others found no effect⁴ or a decrease in MO₂.⁵ Three distinct NOS isoforms exist in mammalian cells: neuronal (nNOS), inducible (iNOS), and endothelial (eNOS) isoforms.⁶ nNOS and eNOS are constitutively expressed in many cell types, whereas iNOS is expressed in response to infection, inflammation, or cytokine activation. Circulating and tissue levels of cytokines, including tumor necrosis factor-, interleukin-2, and interleukin-6, are elevated in patients with chronic heart failure,^7–9 and iNOS expression has been found in cardiac myocytes of patients with dilated cardiomyopathy, myocarditis, and ischemic heart disease,^10,11 suggesting that iNOS could be a source of NO in the failing heart. Consequently, this study was performed to determine whether selective iNOS inhibition with S-methylisothiourea (SMT) influences MO₂ of the failing heart at rest or during exercise. The effect of SMT was compared with nonselective NOS inhibition with N^G-nitro-L-arginine (L-NNA) to determine whether constitutive NOS can also modulate MO₂ in congestive heart failure (CHF).

	Methods

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Studies were performed in 21 adult mongrel dogs weighing 20 to 26 kg and trained to run on a treadmill. All experiments were performed in accordance with the "Guiding Principles in the Care and Use of Laboratory Animals" as approved by the council of the American Physiological Society and with prior approval of the University of Minnesota Animal Care Committee.

Surgical Preparation
Animals were anesthetized with sodium pentobarbital (30 to 35 mg/kg), intubated, and ventilated with oxygen-enriched air. A left thoracotomy was performed, and polyvinyl chloride catheters (3.0-mm OD) were inserted into the ascending aorta and the left ventricle (LV). A solid-state micromanometer (Konigsberg Instruments) was introduced into the LV at the apex. A final catheter was introduced into the right atrial appendage and advanced through the coronary sinus until the tip could be palpated at the anterior interventricular vein to allow selective sampling of blood draining the myocardium perfused by the left anterior descending coronary artery (LAD).³ A Doppler velocity probe (Craig Hartley) was positioned on the LAD, and a silicone catheter (0.3-mm ID) was introduced into the LAD distal to the velocity probe. Catheters were tunneled to exit at the base of the neck; catheters were flushed daily to maintain patency. Postoperative analgesia was provided with butorphanol, 0.4 µg/kg SC every 4 to 6 hours.

Effect of SMT and L-NNA in the Normal Heart
Selective iNOS inhibition was studied in 8 normal dogs 10 to 14 days after surgery. Resting hemodynamics and coronary blood flow (CBF) were recorded, and 2 mL of blood was withdrawn from the aortic and coronary venous catheters for blood gas analysis. Subsequently, a 2-stage treadmill exercise protocol was begun (stage 1, 6.4 km/h at 0% grade; stage 2, 6.4 km/h at 10% grade). Each exercise stage was 3 minutes in duration; aortic and coronary venous blood samples were withdrawn during the last 30 seconds of each exercise stage. After a 10-minute rest period, the selective iNOS inhibitor SMT was infused into the coronary catheter in a dose of 1.5 mg/kg over a period of 10 minutes. Forty minutes after SMT administration, all measurements were repeated at rest and during exercise.

The effect of nonselective NOS inhibition was examined in 9 normal dogs (3 of which had also been studied with SMT on a different day). After control rest and exercise measurements had been obtained, L-NNA was infused in a dose of 1.5 mg/kg IC over a period of 10 minutes. Forty minutes after L-NNA, all measurements were repeated.

Degree of Blockade of Endothelium-Dependent Vasodilation
In 7 normal dogs, the effects of SMT and L-NNA on endothelium-dependent vasodilation were examined. The increases in CBF produced by acetylcholine (3.75 to 75 µg/min IC) were observed before and after SMT (1.5 mg/kg IC). On a separate day, the response of CBF to acetylcholine was examined in 5 dogs before and after L-NNA (1.5 mg/kg IC).

Production of CHF
CHF was produced by rapid ventricular pacing. After completion of baseline studies, the pacemaker was activated at a rate of 220 bpm; pacing was continued at that rate or adjusted upward to a maximum of 250 bpm on the basis of weekly assessments of hemodynamics 1 hour after deactivation of the pacemaker. CHF was considered to have developed when resting LV end-diastolic pressure (LVEDP) was >20 mm Hg or visual estimation of ejection fraction by 2-D echocardiography was <30%; the mean duration of pacing was 27±3 days.

Effect of SMT After Development of CHF
One hour after the pacemaker was deactivated, measurements were obtained at rest and during exercise at 3.2 km/h, 0% grade and 6.4 km/h, 0% grade. SMT, 1.5 mg/kg IC, was then infused over a period of 10 minutes, and 40 minutes later, rest and exercise measurements were repeated.

Effect of L-NNA After Development of CHF
To study the effect of nonselective NOS blockade in dogs with CHF, L-NNA (1.5 mg/kg IC) was administered to 5 dogs that had previously received SMT, and all measurements were repeated 40 minutes later.

Hemodynamic Measurements
LV pressure was measured with the micromanometer; the first derivative of LV pressure (dP/dt) was obtained via electrical differentiation. Coronary blood velocity was measured with a Doppler flowmeter (Craig Hartley). Data were recorded on an 8-channel recorder.

Myocardial Oxygen Consumption
PO₂, PCO₂, and pH were then measured with a blood gas analyzer (model 113, Instrumentation Laboratory). Hemoglobin was determined by the cyanmethemoglobin method. Hemoglobin oxygen saturation was calculated from the blood PO₂, pH, and temperature by use of the oxygen dissociation curve for canine blood. Blood O₂ content was computed as (hemoglobin x 1.34 x % O₂ saturation) + (0.0031 x PO₂). MO₂ was calculated as the product of LAD blood flow and the aortic–coronary vein O₂ content difference.

Western Blot
Tissue homogenates of LV myocardium (160 µg) were separated on 8% SDS-PAGE and transferred onto nitrocellulose membrane, followed by routine Western blotting. Endothelial cells from aortas of normal dogs were used as a positive control for eNOS. Anti-iNOS and anti-eNOS antibodies were purchased from BD Transduction Laboratories and Santa Cruz Biotechnology, respectively.

Data Analysis
Hemodynamic variables were measured from the chart recordings. Coronary flow was computed from the Doppler shift as previously described.⁴ Statistical analysis was performed by use of 2-way (exercise level and treatment) ANOVA for repeated measures. Comparisons within groups were made by use of 1-way ANOVA followed by Scheffé’s post hoc test. Comparisons between groups were made with Student’s t test with the Bonferroni correction. Significance was accepted at P<0.05. Data are presented as mean±SEM.

	Results

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Effect of SMT or L-NNA in Normal Dogs
SMT caused no significant changes of aortic pressure, heart rate, LVEDP, or LV dP/dt at rest or during exercise and did not alter CBF or MO₂ compared with control conditions. The relationships between CBF or MO₂ and rate-pressure product were unchanged after SMT (Figures 1 and 2, left panels).

View larger version (22K): [in this window] [in a new window]   Figure 1. Relationship between rate-pressure product and CBF at rest and during exercise in 8 normal dogs and 6 dogs with CHF. Data were obtained during control conditions and after selective inhibition of iNOS with SMT (1.5 mg/kg IC). *P<0.05 control vs SMT.

View larger version (23K): [in this window] [in a new window]   Figure 2. Relationship between rate-pressure product and MO2 at rest and during exercise in 8 normal dogs and 9 dogs with CHF. Data were obtained during control conditions and after administration of selective iNOS inhibitor SMT (1.5 mg/kg IC). *P<0.05 control vs SMT.

Nonselective NOS inhibition with L-NNA caused significant increases of aortic pressure, LV systolic pressure, and LV dP/dt_max, whereas resting coronary flow and MO₂ were increased by 12% (P<0.05) and 18% (P<0.05), respectively (Table 1). L-NNA caused parallel upward shifts of the relationships between both CBF and MO₂ with rate-pressure product. L-NNA also caused a significant decrease of coronary venous O₂ tension.

View this table: [in this window] [in a new window]   Table 1. Effects of L-NNA in 9 Normal Dogs

Effect of SMT in Animals With CHF
As shown in Table 2, CHF was associated with increases in resting heart rate and LVEDP and decreases in aortic pressure, LV systolic pressure, LV dP/dt_max, CBF, and MO₂ (each P<0.05). In dogs with CHF, selective iNOS inhibition with SMT significantly increased aortic pressure, LV systolic pressure, LV dP/dt_max, and rate-pressure product, whereas heart rate and LVEDP were unchanged. Moreover, SMT caused increases in CBF and MO₂ at rest and during exercise in CHF dogs (P<0.05); this was principally an offset effect with an upward shift in the relationship between rate-pressure product and both CBF (Figure 1, right) and MO₂ (Figure 2, right).

View this table: [in this window] [in a new window]   Table 2. Effects of SMT on Systemic and Coronary Hemodynamic Data at Rest and During Graded Treadmill Exercise in 8 Dogs With CHF

Effect of L-NNA in Animals With CHF
After completion of the SMT measurements, in 5 dogs with CHF, nonselective NOS inhibition with L-NNA was produced. In comparison with SMT, L-NNA caused no further change of LV systolic pressure, aortic pressure, or LV dP/dt_max (Table 3). L-NNA tended to further increase MO₂ and CBF (Table 3 and Figure 3), although this was not significant.

View this table: [in this window] [in a new window]   Table 3. Effects of SMT and SMT+L-NNA on Systemic and Coronary Hemodynamic Data at Rest and During Graded Treadmill Exercise in 5 Dogs With CHF

View larger version (26K): [in this window] [in a new window]   Figure 3. Relationship between rate-pressure product and CBF (left) and MO2 (right) in 5 dogs with CHF at rest and during exercise. Data were obtained during control conditions, after administration of selective iNOS inhibitor SMT (1.5 mg/kg), and after nonselective NOS blockade with L-NNA (1.5 mg/kg IC).

Responses to Acetylcholine
Intracoronary acetylcholine had no effect on heart rate or aortic pressure but caused dose-dependent increases of CBF. SMT had no significant effect on the increase in CBF produced by acetylcholine. In contrast, L-NNA caused 52% mean inhibition of the increase in coronary flow produced by acetylcholine (3.75 to 75 µg/min, P<0.01).

Expression of iNOS and eNOS
Western blots of ventricular homogenates were performed in 6 CHF and 6 normal dogs (Figure 4). iNOS was almost undetectable in the normal dogs but was significantly increased in the failing hearts (1.26±0.01 versus 3.50±0.49, P<0.01). eNOS expression was not significantly different between the 2 groups (4.1±0.6 in CHF versus 5.8±0.4 in normal).

View larger version (30K): [in this window] [in a new window]   Figure 4. Western blots of iNOS and eNOS in CHF and normal dogs.

	Discussion

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The selective iNOS inhibitor SMT increased MO₂ and CBF in dogs with CHF but not in normal animals, suggesting that NO produced by iNOS can modulate cardiac function in the failing heart. SMT also increased LV dP/dt_max in dogs with CHF, suggesting an increase of myocardial contractility. The finding that the addition of the nonselective NOS inhibitor L-NNA tended to further increase MO₂ suggests that NO produced by eNOS or nNOS might also play a role in the failing hearts.

NO in the Normal Heart
Nonselective NOS inhibition with L-NNA resulted in modest significant increases of CBF at rest and during exercise in the normal animals.^12,13 This increase in CBF appeared to result from an increase of MO₂ with secondary coronary vasodilation,¹⁴ inasmuch as coronary sinus PO₂ decreased significantly after L-NNA, indicating increased myocardial oxygen extraction. NO can compete with oxygen at cytochrome oxidase,¹ and nonselective NOS inhibition has been reported to increase both total body and skeletal muscle oxygen consumption in normal dogs.^15,16 Conversely, stimulating endogenous NO production with bradykinin or administering an NO donor decreased oxygen consumption in perfused rat hearts, an effect not mediated by cGMP.¹⁷ In contrast to the above reports, in anesthetized open-chest dogs, blockade of NO production with N^G-nitro-L-arginine methyl ester failed to increase MO₂.⁴ This may be related to methodological differences, such as the depressant effect of general anesthesia on mitochondrial function.

NO in CHF
CHF is associated with impaired endothelium-dependent vasodilation.¹⁸ Moreover, bradykinin caused smaller decreases of oxygen consumption in myocardial tissue slices from CHF dogs compared with normal dogs,¹⁹ suggesting depressed receptor-mediated endothelial NO production. Administration of an NO donor did inhibit oxygen consumption,²⁰ indicating that NO can modulate MO₂ in failing myocardium. Furthermore, we observed that nonselective NOS inhibition increased MO₂ in dogs with pacing-induced CHF.²¹ This finding raises questions concerning the source of NO in the animals with CHF and the mechanism for the increased MO₂ after blockade of NO synthesis. In the present study, Western blotting showed no difference in eNOS protein expression between myocardium from normal and CHF hearts. Protein expression, however, does not necessarily correlate with activity. Superoxide production is increased in the failing heart; the avid reaction of NO with superoxide would be expected to decrease NO bioavailability. Furthermore, a change in eNOS localization might cause a functional alteration despite there being no change in protein content. For example, although eNOS expression was decreased in the endothelium of aortas from rats with CHF, eNOS expression in aortic smooth muscle was increased, with no change in total aortic eNOS expression.²² Such a change in localization might decrease endothelium-dependent NO-mediated responses.

In the present study, inhibition of NO synthesis with either SMT or L-NNA resulted in increases of LV dP/dt_max in the dogs with CHF, suggesting an increase of contractility, but not in normal dogs. It is possible that differences in basal levels of cytosolic cGMP were responsible for the differing responses between normal and CHF animals. With low basal levels of cGMP, NO can enhance contractile performance by inhibiting cAMP phosphodiesterase, thereby allowing cAMP to accumulate.¹⁵ Conversely, high basal levels of cGMP reduce contractility because of activation of cGMP-dependent protein kinases; in this situation, blocking NO production increases contractile performance.¹⁵ If basal cytosolic cGMP levels in the cardiac myocytes were increased in the animals with CHF, then inhibition of NO production would be expected to increase contractile performance and therefore MO₂.

A second possible explanation for an increase of contractility in the dogs with CHF is that removal of an inhibitory effect of NO on mitochondrial respiration might allow ATP production to increase, thereby augmenting energy availability to the contractile apparatus. Tatsumi et al²³ demonstrated that interleukin-1ß increased NO production in cultured neonatal cardiac myocytes, and this was followed by a decline in cellular ATP concentration and myocyte contractility; these effects were blocked by N^G-monomethyl-L-arginine. In isolated perfused hearts, Kelm et al²⁴ demonstrated that addition of NO to the coronary perfusate caused a decrease of LV developed pressure that was associated with reductions of myocardial ATP and the free-energy change of ATP hydrolysis that was paralleled by decreased MO₂. Washout of NO reversed the high-energy phosphate changes and returned MO₂ and contractile performance to baseline levels. The investigators concluded that NO depressed myocardial energy generation with a secondary decrease of contractile performance. It is possible that NO could similarly impair myocardial energy production in the failing heart.

A third possible explanation for an increase of myocardial contractility after NOS inhibition relates to a decrease in peroxynitrite formed as NO reacts with superoxide. In isolated working rat hearts, cytokine infusion caused a decline in contractile function that was associated with increased production of NO and peroxynitrite.²⁵ The decreased contractile function was abrogated by NOS inhibition with L-NNA, the superoxide scavenger tiron, or the peroxynitrite decomposition catalyst 5,10,15,20-tetrakis-(4-sulfonatophenyl)-parphyrinato-iron(III) (FeTPPS). Superoxide production is increased in the failing heart²⁶; the simultaneous augmentation of NO production would result in increased formation of peroxynitrite, which could depress contractility. A fourth possible mechanism for the increase in MO₂ produced by NOS inhibition relates to the contribution of NO to the depressed responsiveness to ß-adrenergic stimulation in the failing heart. Nonselective NOS inhibition enhances the inotropic response to ß-adrenergic stimulation in patients and dogs with CHF.^27,28 If the increased MO₂ after NOS inhibition were due to an enhanced catecholamine response, however, then the effect would probably have been most prominent during exercise, when catecholamines are further increased, in contrast to the observed parallel upward shift in the relationship between MO₂ rate-pressure product.

Finally, it is likely that the increase of MO₂ resulted in part from the increased arterial and LV systolic pressure that occurred in response to NOS inhibition in animals with CHF. iNOS expression has been reported in skeletal muscle in the setting of CHF,²⁹ so it is not unexpected that blockade of iNOS activity would cause an increase in arterial pressure. In contrast to the present findings, Elsner et al³⁰ reported that L-NNA caused no change of arterial pressure in dogs with pacing-induced heart failure. In that report, however, dogs were studied relatively early (on day 11 of pacing) compared with 27±3 days in the present study. It is possible that the longer duration of pacing in the present study would favor increased peripheral iNOS expression.

Limitations of the Study
The increased MO₂ after SMT might have been partly a result of nonselective inhibition of eNOS or nNOS. The dose of SMT used did not impair the response to the endothelial-dependent vasodilator acetylcholine, however, indicating that the concentration of SMT used did not inhibit agonist-mediated NO production by eNOS. Furthermore, SMT caused no change of coronary flow or MO₂ in normal dogs. One must consider whether expression of iNOS in CHF animals was not the result of heart failure but rather the result of the surgical procedure and chronic instrumentation. Had this been the case, however, it is likely that similar iNOS expression would have been found in the chronically instrumented animals that did not have CHF. The finding that SMT had no effect on animals without heart failure suggests that the chronic instrumentation alone did not result in iNOS expression in the absence of CHF.

	Acknowledgments

 
This study was supported by US Public Health Service grants HL-20598, HL-21872, and HL-58067 from the National Heart, Lung, and Blood Institute. Dr Traverse is supported by a Scientist Development Award from the American Heart Association. We wish to acknowledge the expert technical assistance provided by Melanie Crampton, Paul Lindstrom, and Shauna Voss. Secretarial assistance was provided by Carol Quirt.

Received March 5, 2002; revision received April 22, 2002; accepted April 24, 2002.

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