Three Calpain Isoforms Are Autolyzed in Rat Fast-twitch Muscle After Eccentric Contractions
Overview
Physiology
Affiliations
The present study investigated changes in autolysis of three calpain isoforms in skeletal muscles undergoing eccentric contractions (ECC), leading to prolonged force deficits. Rat extensor digitorum longus and tibialis anterior muscles were exposed to 200-repeated ECC in situ, excised immediately after or 3 or 6 days after cessation of ECC, and used for measures of force output and for biochemical analyses. Full restoration of tetanic force in ECC-treated muscles was not attained until 6 days of recovery. Maximal calpain activity determined by a fluorogenic substrate was unaltered immediately after ECC, but increased to 313 and 450 % after 3 and 6 days, respectively. Increases in the amount of autolyzed calpain-3 were apparent immediately and developed progressively with recovery time, whereas elevations of autolyzed μ- and m-calpain occurred after 3 and 6 days, respectively. The protein content was augmented only in m-calpain. It is suggested that the three calpain isoforms may be involved in the dismantling, repair, remodeling and/or regeneration processes in ECC-treated muscles.
Calpain-3 Is Not a Sodium Dependent Protease and Simply Requires Calcium for Activation.
Wette S, Lamb G, Murphy R Int J Mol Sci. 2023; 24(11).
PMID: 37298357 PMC: 10253552. DOI: 10.3390/ijms24119405.
Efficacy of leupeptin in treating ischemia in a rat hind limb model.
Gurevich M, Iocolano K, Martin I, Singh G, Khan S, Bui D Physiol Rep. 2022; 10(15):e15411.
PMID: 35924300 PMC: 9350425. DOI: 10.14814/phy2.15411.
Kanzaki K, Watanabe D, Shi J, Wada M J Muscle Res Cell Motil. 2022; 43(3):147-156.
PMID: 35854160 DOI: 10.1007/s10974-022-09625-1.
Yamada T, Ashida Y, Tatebayashi D, Himori K PLoS One. 2019; 14(10):e0223551.
PMID: 31596883 PMC: 6785062. DOI: 10.1371/journal.pone.0223551.
Wang C, Ma Z, Yan D, Liu C, Deng Y, Liu W Cells. 2018; 7(12).
PMID: 30544779 PMC: 6316740. DOI: 10.3390/cells7120258.