Impact of Calcium on Mitochondrial Respiration and Cyt c Accumulation in Isotonic and Hypotonic Conditions

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This study examines the effects of calcium ions (Ca2+) and pre-incubation conditions on mitochondrial respiration rates and cytochrome c (Cyt c) accumulation. Using varying concentrations of CaCl2, we conducted experiments under isotonic and hypotonic conditions. Key findings highlight how the presence of Ca2+ influences mitochondrial respiration, measured as O2 consumption, as well as the accumulation of Cyt c in different treatment groups. Understanding these mechanisms is crucial for comprehending mitochondrial function in various physiological conditions.

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May 12, 2026

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Impact of Calcium on Mitochondrial Respiration and Cyt c Accumulation in Isotonic and Hypotonic Conditions

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180 * B 160 v2 140 A # 140 v3 120 120 Mitochondria 0.00 100 CaCl2 100 Ca2+ accumulation, nmol/mg prot. C 80 80 Respiration rate, nmol O2/min mg protein - - 0.05 0.05 60 60 40 - - 0.10 0.10 40 20 +PKG 20 0 - - 0.15 CsA CONTROL PKG PKG +DT-3 0 ISOTONIC PKG CONTROL - - 0.20 0.20 HYPOTONIC PREINCUBATION CONTROL - - 0.2 0.25 * 0.0 5 10 20 25 0.0 5 10 15 20 25 30 D min min 0.12 0.08 Cyt. c, nmol/mg protein ^ DA520 0.04 0.00 CONTROL +Ca2+ PKG +Ca2+