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pubmed-article:3228676pubmed:abstractText1. The effect of ryanodine on contractile responses dependent either on intracellular Ca2+ release or on extracellular Ca2+ influx were studied in aorta and mesenteric resistance vessels of the rat. 2. In aorta, in the presence of extracellular Ca2+, pretreatment with ryanodine (10(-5)M) did not modify contractile responses to noradrenaline (NA) (10(-6)M) whereas in the absence of Ca2+, pretreatment with ryanodine reduced to about 25% the contractile response to NA (10(-6)M) and totally abolished the transient contraction elicited by caffeine (5 x 10(-2)M). 3. In mesenteric resistance vessels, ryanodine (10(-5)M) had no effects on NA (10(-5)M)-induced tension in the presence of extracellular Ca2+ but totally abolished contractile responses to caffeine (10(-2)M) in the absence of Ca2+. 4. In K+ -depolarized mesenteric resistance vessels, pretreatment with ryanodine (10(-5)M) significantly enhanced contractile responses to Ca2+ concentrations higher than 10(-4)M and 10(-3)M for arteries depolarized with 30 mM and 40 mM K+ respectively. Concentrations of either diltiazem (6 x 10(-7)M) or nifedipine (10(-8)M) that abolished contractile responses to Ca2+ in depolarized arteries (K+, 40 mM) did not totally inhibit the enhancement of Ca2+ -induced contractions obtained in the presence of ryanodine. 5. Ryanodine did not modify the Ca2+ concentration-effect relationships in mesenteric resistance vessels exposed to NA or arginine vasopressin. 6. These data are consistent with the hypothesis that ryanodine induces a release of Ca2+ from intracellular stores, resulting in a subsequent reduction of the amplitude of contractions dependent upon intracellular Ca2+ liberation. Furthermore, the ability of sarcoplasmic reticulum to buffer rises in cytoplasmic Ca2+ may be reduced in the presence of ryanodine, thereby accounting for the potentiation of contractile responses to Ca2+ in K+-depolarized mesenteric resistance vessels.lld:pubmed
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pubmed-article:3228676pubmed:articleTitleEffects of ryanodine on tension development in rat aorta and mesenteric resistance vessels.lld:pubmed
pubmed-article:3228676pubmed:affiliationUniversité Louis Pasteur, UA CNRS 600, Illkirch, France.lld:pubmed
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