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Year : 2000  |  Volume : 32  |  Issue : 6  |  Page : 365--368

Role of nitric oxide in calcium homeostasis in coronary artery of goat

DK Deka1, V Raviprakash2, SK Mishra3 
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2 
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Correspondence Address:
D K Deka


Objective : To study the role of NO in the modulation of extracellular and intracellular Ca++ in vasodilator mechanism. Methods: Goat hearts were collected from local abattoirs within 20-30 min. of slaughter in cold aerated modified Kreb«SQ»s Henseleit solution. Both the left anterior and circumflex coronary artery branches were dissected out, cut into rings of 3-4 mm length and 2-3 mm external diameter and mounted in a 20 ml organ bath through triangular stainless steel hook. The tissues were equilibrated for 90 min. under a resting tension of 1.5 g. Responses were recorded isometrically with a force displacement transducer connected to a polygraph. Role of extracellular Ca++ was studied in Ca++ - induced contractile tissues and that of intracellular Ca++ was studied in U- 46619 - contracted tissues either in the absence or presence of NO donors. Results: SIN-1 inhibited the contractions induced by Ca++ with a rightward shift of concentration-response curve and with corresponding, but not concentration- dependent increase in EC50 . SNP caused concentration-dependent rightward shift of concentration -response curve of Ca++ . Both SIN-1 and SNP had a bimodal effect with significant inhibition at low concentration of Ca++ and a potentiating effect at high Ca++ concentration. In addition, SNP and SIN -1 inhibited U- 46619 - induced contraction dose dependently. Conclusion: Both SIN-1 and SNP inhibited influx of extracellular Ca++ as well as release of intracellular Ca++ .


How to cite this article:
Deka D K, Raviprakash V, Mishra S K. Role of nitric oxide in calcium homeostasis in coronary artery of goat.Indian J Pharmacol 2000;32:365-368


How to cite this URL:
Deka D K, Raviprakash V, Mishra S K. Role of nitric oxide in calcium homeostasis in coronary artery of goat. Indian J Pharmacol [serial online] 2000 [cited 2021 Oct 25 ];32:365-368
Available from: https://www.ijp-online.com/article.asp?issn=0253-7613;year=2000;volume=32;issue=6;spage=365;epage=368;aulast=Deka;type=0