Nitric oxide inhibits calcium release from sarcoplasmic reticulum of porcine tracheal smooth muscle cells

Mathur S Kannan, Y. S. Prakash, Dana E Johnson, Gary C. Sieck

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71 Scopus citations


In the present study, effects of the nitric oxide donor, S-nitroso-N- acetylpenicillamine (SNAP), on sarcoplusmic reticulum (SR) Ca2+ release were examined in freshly dissociated porcine tracheal smooth muscle (TSM) cells. Fura 2-loaded TSM cells were imaged using video fluorescence microscopy. SR Ca2+ release was induced by acetylcholine (ACh), which acts principally through inositol 1,4,5-trisphosphate (IP3) receptors, and by caffeine, which acts principally through ryanodine receptors (RyR). SNAP inhibited ACh-induced SR Ca2+ release at both 0 and 2.5 mM extracellular Ca2+. Degraded SNAP had no effect on ACh-induced SR Ca2+ release. SNAP also inhibited caffeine-induced SR Ca2+ release. ACh-induced Ca2+ influx was not affected by SNAP when SR reloading was blocked by thapsigargin. SNAP also did not affect SR Ca2+ reuptake. The membrane-permeant analogue of guanosine 3',5'-cyclic monophosphate (cGMP), 8-bromo-cGMP, mimicked the effects of SNAP. These results suggest that, in porcine TSM cells, SNAP reduces the intracellular Ca2+ response to ACh and caffeine by inhibiting SR Ca2+ release through both IP3 and RyR, but not by inhibiting influx or repletion of the SR Ca2+ stores. These effects are likely mediated via cGMP-dependent mechanisms.

Original languageEnglish (US)
Pages (from-to)L1-L7
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Issue number1 16-1
StatePublished - Jan 1997


  • acetylcholine
  • caffeine
  • fluorescence
  • guanylyl cyclase
  • receptor
  • video


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