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. 1990 Aug;100(4):677–684. doi: 10.1111/j.1476-5381.1990.tb14075.x

Ryanodine reveals multiple contractile and relaxant mechanisms in vascular smooth muscle: simultaneous measurements of mechanical activity and of cytoplasmic free Ca2+ level with fura-2.

T Hisayama 1, I Takayanagi 1, Y Okamoto 1
PMCID: PMC1917603  PMID: 2119840

Abstract

1. The effects of ryanodine on changes in cytoplasmic Ca2+ level ([Ca2+]i) and muscle tension induced by maximum concentrations of phenylephrine (Phe; 1 microM), prostaglandin F2 alpha (PGF2 alpha, 10 microM), caffeine (Caf, 30 mM) and isoprenaline (Iso, 1 microM) were examined in rat aortic strips using fura-2. 2. In normal media, Phe and PGF2 alpha produced a phasic contraction, followed by a tonic one. Caf elicited only a transient contraction. When the preparation was treated with 10 microM ryanodine, an increase in [Ca2+]i was induced accompanied by a nicardipine (1 microM)-resistant contraction which was [Ca2+]o-dependent. 3. In Ca2(+)-free solution, the three stimulants elicited transient increases in [Ca2+]i. Transient contractions to Phe and Caf were accompanied by changes in [Ca2+]i. The transient increase in [Ca2+]i induced by PGF2 alpha was not accompanied by a corresponding contraction. 4. Sustained contractions were induced by Phe and PGF2 alpha in the absence of external Ca2+, while the increase in [Ca2+]i was reduced. A larger maximum contraction was induced by PGF alpha than by Phe. 5. Ryanodine abolished both the Caf- and Phe-induced [Ca2+]i transient increases and the corresponding contractions, but had no substantial effect on the PGF2 alpha-induced [Ca2+]i transient increase. Ryanodine had no influence on the sustained contractions induced by Phe and PGF2 alpha. 6. Iso relaxed both sustained contractions almost completely, without any detectable change in [Ca2+]i. Treatment of the preparation with ryanodine had no effect on the concentration-response curves for Iso in relaxing the 0.1 microM Phe- or 40 mM K(+)-induced precontraction.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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