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- W4240162772 abstract "The superficial buffer barrier function of the sarcoplasmic reticulum (SR) during rest and that during stimulation with Bay k 8644, an agonist of L-type Ca2+ channels, were compared in endothelium-denuded strips of tail arteries from 13-week-old normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR), by measuring the effects of cyclopiazonic acid (CPA) and thapsigargin that inhibit SR Ca2+-ATPase and the effect of ryanodine that depletes SR Ca2+. The addition of 10 microM CPA induced a transient contraction that was not significantly different between WKY and SHR. The CPA-induced contraction was strongly inhibited by 100 nM nifedipine and was abolished by Ca2+-free solution in both strains. Thapsigargin (100 nM) or ryanodine (10 microM) induced similar, small transient contractions in the two strains. The addition of Bay k 8644 (1-100 nM) almost failed to induce a contraction in both WKY and SHR. When the strips were preincubated with 10 microM CPA, 100 nM thapsigargin or 10 microM ryanodine, Bay k 8644 induced similar concentration-dependent contractions in the two strains. The amount of Ca2+ stored in the SR, as estimated from the 20 mM caffeine-induced contraction, was not significantly different between WKY and SHR. Our results suggest that the SR of rat tail arteries can buffer a large amount of Ca2+ that enters the cell during the rest and the Bay k 8644 stimulation, and these functions are not altered in SHR." @default.
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- W4240162772 date "2000-01-01" @default.
- W4240162772 modified "2023-09-26" @default.
- W4240162772 title "Ca<SUP>2+</SUP> Buffering Function of Sarcoplasmic Reticulum in Rat Tail Arteries:Comparison in Normotensive and Spontaneously Hypertensive Rats" @default.
- W4240162772 doi "https://doi.org/10.1254/jjp.83.335" @default.
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