L773:0031 6768 OR L773:1432 2013
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Paradoxical decrease in cytosolic calcium with increasing depolarization by potassium in guinea-pig mesotubarium smooth muscle
- Lydrup, M L (author)
- Himpens, B (author)
- Droogmans, G (author)
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- Somlyo, A P (author)
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- 1992
- 1992
- English.
- In: Pflügers Archiv. - 0031-6768. ; 420:5-6, s. 428-433
- Journal article (peer-reviewed)
Abstract
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- The free intracellular Ca2+ concentration ([Ca2+]i) was measured simultaneously with isometric force in strips of guinea-pig mesotubarium using the Fura-2 technique. [Ca2+]i and force were maximal at a relatively low (30 mM) concentration of extracellular K+ ([K+]o), and declined at 90 and 140 mM K+. Plateau values of both [Ca2+]i and force were higher in the presence of 5.10(-6) M ryanodine, indicating that the sarcoplasmic reticulum (SR) contributes to the decline with depolarization. Force and [Ca2+]i at 90 mM K+ were both lower then the high-K+ solution was applied after a period in 30 mM K+ than after a period in normal solution (5.9 mM K+), consistent with inactivation of Ca2+ channels during prolonged depolarization. Addition of carbachol to the depolarized muscle caused a maintained increase in force without maintained increase in [Ca2+]i. We conclude that the decrease in force at increased [K+]o (the "calcium-potassium paradox") is due to a membrane-potential-mediated decrease in [Ca2+]i and, to a lesser extent, to desensitization of the contractile-regulatory apparatus to Ca2+.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Physiology (hsv//eng)
Keyword
- Calcium
- Mesotubarium
- Smooth muscle
- Fura-2
- K+ depolarization
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- art (subject category)
- ref (subject category)
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- Lydrup, M L
- Himpens, B
- Droogmans, G
- Hellstrand, Per
- Somlyo, A P
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- MEDICAL AND HEALTH SCIENCES
- MEDICAL AND HEAL ...
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- and Physiology
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- Pflügers Archiv
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- Lund University
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