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• W2029678006 abstract "Intracellular Ca2+ ([Ca2+]i) dynamics were studied in identified rat gonadotropes using the whole-cell patch-clamp technique in conjunction with Indo-1 photometry. The kinetics of depolarization-induced [Ca2+]i transients vary with Ca2+ load. In addition to a rapid initial decay, large (> 500 nM) [Ca2+]i transients have a slow plateau phase. Application of the mitochondrial inhibitor carbonyl cyanide m-chlorophenylhydrazone (CCCP) significantly slows the decay of [Ca2+]i transients, consistent with stopping uptake of Ca2+ by mitochondria. CCCP causes a small increase of [Ca2+]i at rest. After a large Ca2+ entry the amount is much larger, consistent with release from a mitochondrial Ca2+ pool that fills during cytoplasmic Ca2+ loading. The rate of Ca2+ uptake by mitochondria is dependent upon [Ca2+]i. Consistent with previous studies, gonadotropin releasing hormone (GnRH) induces [Ca2+]i oscillations. The mitochondrial inhibitors CCCP and cyanide (CN-) terminate these oscillations. The mitochondrial ATP-synthase inhibitor oligomycin reduces the frequency and increases the amplitude of the oscillations. In the presence of ruthenium red (a non-specific blocker of the mitochondrial Ca(2+)-uniporter) in the pipette, GnRH does not induce rhythmic [Ca2+]i oscillations. We suggest that mitochondria play a significant role in the rapid clearance of cytosolic Ca2+ loads in gonadotropes and participate in GnRH-induced periodic [Ca2+]i oscillations." @default.
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• W2029678006 date "1996-12-01" @default.
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• W2029678006 title "Involvement of mitochondria in intracellular calcium sequestration by rat gonadotropes" @default.
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• W2029678006 doi "https://doi.org/10.1016/s0143-4160(96)90094-9" @default.
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