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Calcium overload increases oxidative stress in old rat gastrocnemius muscle

Abstract : In order to challenge in vivo muscle Ca2+ homeostasis and analyze consequences on mitochondrial H2O2 release (MHR) and sarcopenia, we injected Ca2+ ionophore A23187 (200 µg/kg, ip) in adult and old rats and measured gastrocnemius mass and mitochondrial Ca2+ content (MCC) using radioactive Ca2+ 48 h after injection. In a second experiment performed in old rats, we measured isocitrate dehydrogenase (ICDH) activity as an index of MCC, MHR, mitochondrial respiration, citrate synthase, COX and antioxydant enzyme activities 24 h after a 150 µg/kg injection. In adult rats, muscle mass and MCC were unchanged by A23187. In old rats, MCC increased 24 h after injection as reflected by a significant increase in ICDH activity; measured MCC tended to increase at 48 h. MHR and Mn-SOD activity were significantly increased at 24 h, and GPX activity was reduced. Muscle mass was unchanged but was negatively correlated with MCC in control and treated old rats. In conclusion, in old rats, A23187 probably induced a mitochondrial Ca2+ overload responsible for the observed increase in MHR without leading to muscle atrophy on a short term basis.
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https://hal.inrae.fr/hal-02673445
Déposant : Migration Prodinra <>
Soumis le : dimanche 31 mai 2020 - 16:39:42
Dernière modification le : vendredi 5 février 2021 - 03:41:53

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Frédéric Capel, Luc Demaison, F. Maskouri, Anne Diot, Caroline Buffière, et al.. Calcium overload increases oxidative stress in old rat gastrocnemius muscle. Journal of Physiology and Pharmacology, Krakow Polish Physiological Society, 2005, 56 (3), pp.369-380. ⟨hal-02673445⟩

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