alexa Interaction of Sr2+ with Ca2+-induced Ca2+ release in mitochondria.
Biochemistry

Biochemistry

Biochemistry & Analytical Biochemistry

Author(s): Saris NE, van den Bosch H

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Abstract Respiring rat liver mitochondria are known to spontaneously release the Ca2+ taken up when they have accumulated Ca2+ over a certain threshold, while Sr2+ and Mn2+ are well tolerated and retained. We have studied the interaction of Sr2+ with Ca2+ release. When Sr2+ was added to respiring mitochondria simultaneously with or soon after the addition of Ca2+, the release was potently inhibited or reversed. On the other hand, when Sr2+ was added before Ca2+, the release was stimulated. Ca2+-induced mitochondrial damage and release of accumulated Ca2+ is generally believed to be due to activation of mitochondrial phospholipase A (EC 3.1.1.4.) by Ca2+. However, isolated mitochondrial phospholipase A activity was little if at all inhibited by Sr2+. The Ca2+-release may thus be triggered by some Ca2+-dependent function other than phospholipase.
This article was published in J Bioenerg Biomembr and referenced in Biochemistry & Analytical Biochemistry

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