Nitrendipine binding in congestive heart failure due to myocardial infarction

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Circulation Research (An Official Journal of the American Heart Association); (USA)

DOI:https://doi.org/10.1161/01.RES.66.3.782· OSTI ID:6854007

Dixon, I M; Lee, S L; Dhalla, N S ^[1]

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1. St. Boniface General Hospital Research Centre, Winnipeg, Manitoba (Canada)

Depressed cardiac pump function is the hallmark of congestive heart failure, and it is suspected that decreased influx of Ca2+ into the cardiac cell is responsible for depressed contractile function. Since Ca2+ channels in the sarcolemmal membrane are considered to be an important route for the entry of Ca2+, we examined the status of Ca2+ receptors/channels in failing rat hearts after myocardial infarction of the left ventricular free wall. For this purpose, the left coronary artery was ligated and hearts were examined 4, 8, and 16 weeks later; sham-operated animals served as controls. Hemodynamic assessment revealed decreased total mechanical energy (left ventricular systolic pressure x heart rate), increased left ventricular diastolic pressure, and decreased positive and negative dP/dt in experimental animals at 4, 8, and 16 weeks. Although accumulation of ascites in the abdominal cavity was evident at 4 weeks, other clinical signs of congestive heart failure in experimental rats were evident from the presence of lung congestion and cardiac dilatation at 8 and 16 weeks after induction of myocardial infarction. The density of Ca2+ receptors/channels in crude membranes, as assessed by (3H)nitrendipine binding assay, was found to be decreased in the uninfarcted experimental left ventricle at 8 and 16 weeks; however, no change in the affinity of nitrendipine was evident. A similar depression in the specific binding of another dihydropyridine compound, (3H)PN200-110, was also evident in failing hearts. Brain and skeletal muscle crude membrane preparations, unlike those of the right ventricle and liver, revealed a decrease in Ca2+ receptors/channels density in experimental animals at 16 weeks.

• OSTI ID: 6854007
• Journal Information: Circulation Research (An Official Journal of the American Heart Association); (USA), Journal Name: Circulation Research (An Official Journal of the American Heart Association); (USA) Vol. 66:3; ISSN CIRUA; ISSN 0009-7330
• Country of Publication: United States
• Language: English

Related Subjects

550901* -- Pathology-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
BIOCHEMICAL REACTION KINETICS
CALCIUM COMPOUNDS
CARDIOVASCULAR DISEASES
CELL CONSTITUENTS
CELL MEMBRANES
DISEASES
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
KINETICS
MAMMALS
MEMBRANE PROTEINS
MEMBRANE TRANSPORT
MEMBRANES
MYOCARDIAL INFARCTION
ORGANIC COMPOUNDS
PATHOGENESIS
PORINS
PROTEINS
RATS
REACTION KINETICS
RECEPTORS
RODENTS
TRACER TECHNIQUES
TRITIUM COMPOUNDS
VERTEBRATES