title: Protective effect of coenzyme Q10 on cultured skeletal muscle cell injury induced by continuous electric field stimulation.
abstract: The protective effect of coenzyme Q10 (CoQ10) on continuous electric field stimulation-induced muscular injury was investigated in cultured cells established from neonatal rat femoral muscles. After cultivation for 9 days, skeletal muscle cells contracted and relaxed rhythmically for 4 hr in response to continuous electric field stimulation (power, 5 V; duration, 5 msec; amplitude, 3 Hz). After the onset of the stimulation, lactate and lactate dehydrogenase (LDH) release and intracellular Ca2+ contents ([Ca2+]i) at relaxation increased gradually. In contrast, the intracellular ATP contents decreased. The addition of 5 microM CoQ10, but not alpha-tocopherol and radical scavengers, to the culture medium protected the cells against these biochemical changes after the stimulation. Verapamil, an inhibitor of Ca2+ channels, also attenuated the increase in [Ca2+]i at relaxation and LDH. These results suggested that one of the causal mechanisms of muscular injury is an increase in [Ca2+]i due to the excess entry of extracellular Ca2+, and that CoQ10 can protect skeletal muscle cells against such undesirable biochemical changes.
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D002118:Calcium / Q000378:metabolism; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002478:Cells, Cultured; D003067:Coenzymes; D004558:Electric Stimulation; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D007773:Lactates / Q000378:metabolism; D019344:Lactic Acid; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000187:drug effects / Q000293:injuries / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D014451:Ubiquinone / Q000031:analogs & derivatives* / Q000494:pharmacology; D014700:Verapamil / Q000494:pharmacology
chemical_list: D002121:Calcium Channel Blockers; D003067:Coenzymes; D007773:Lactates; D014451:Ubiquinone; D019344:Lactic Acid; D000255:Adenosine Triphosphate; D014700:Verapamil; D007770:L-Lactate Dehydrogenase; C024989:coenzyme Q10; D002118:Calcium