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Mitochondrial Matrix Calcium Is an Activating Signal for Hormone Secretion.

机译:线粒体基质钙是激素分泌的激活信号。

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Mitochondrial Ca(2+) signals have been proposed to accelerate oxidative metabolism and ATP production to match Ca(2+)-activated energy-consuming processes. Efforts to understand the signaling role of mitochondrial Ca(2+) have been hampered by the inability to manipulate matrix Ca(2+) without directly altering cytosolic Ca(2+). We were able to selectively buffer mitochondrial Ca(2+) rises by targeting the Ca(2+)-binding protein S100G to the matrix. We find that matrix Ca(2+) controls signal-dependent NAD(P)H formation, respiration, and ATP changes in intact cells. Furthermore, we demonstrate that matrix Ca(2+) increases are necessary for the amplification of sustained glucose-dependent insulin secretion in beta cells. Through the regulation of NAD(P)H in adrenal glomerulosa cells, matrix Ca(2+) also acts as a positive signal in reductive biosynthesis, which stimulates aldosterone secretion. Our dissection of cytosolic and mitochondrial Ca(2+) signals reveals the physiological importance of matrix Ca(2+) in energy metabolism required for signal-dependent hormone secretion.
机译:线粒体Ca(2+)信号已被提议来加速氧化代谢和ATP的产生,以匹配Ca(2+)激活的能量消耗过程。理解线粒体Ca(2+)的信号传导的努力已被无法操纵矩阵Ca(2+)而没有直接改变胞质Ca(2+)的能力所阻碍。我们能够通过将Ca(2+)结合蛋白S100G靶向基质来选择性地缓冲线粒体Ca(2+)的升高。我们发现矩阵Ca(2+)控制完整细胞中信号依赖性NAD(P)H的形成,呼吸作用和ATP变化。此外,我们证明,基质Ca(2+)的增加对于β细胞中持续葡萄糖依赖性胰岛素分泌的扩增是必要的。通过调节肾上腺肾小球细胞中的NAD(P)H,基质Ca(2+)在还原性生物合成中也起着正信号的作用,从而刺激了醛固酮的分泌。我们解剖的胞质和线粒体Ca(2+)信号揭示了信号依赖性激素分泌所需的能量代谢中基质Ca(2+)的生理重要性。

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