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• W1977387616 abstract "The goal of this work was to characterize the roles of mu-calpain in skeletal muscle protein degradation. Three approaches were developed to alter mu-calpain activity in rat myotubes. These included over-expression of antisense mu-calpain (mu-AS), dominant negative mu-calpain (mu-DN) and the antisense 30-kDa calpain subunit (30-AS). Constructs were expressed in rat L8 myotubes, and their effects on protein degradation and on concentrations of intact and/or degraded fodrin, desmin and tropomyosin were examined. An ecdysone-inducible expression system, in which we replaced a constitutively active CMV promoter with a skeletal muscle-specific alpha-actin promoter, was used to drive expression. Cell lines were evaluated by expression of the gene-of-interest following addition of ponasterone A (PA; ecdysone analog) to culture medium. Changes in calpain activity were assessed by evaluating fodrin degradation. 30-AS, which should alter both mu- and m-calpain activities, increased intact fodrin concentration. mu-DN and mu-AS reduced fodrin degradation products. mu-DN reduced total protein degradation by 7.9% (P<0.01) at 24 h and by 10.6% (P<0.01) at 48 h. mu-AS reduced total protein degradation by 6.4% at 24 h (P<0.05). 30-AS reduced total protein degradation by 13.4% (P<0.05) and 7.3% (P<0.05) following 24 and 48 h of PA administration, respectively. We assessed effects of mu-DN, mu-AS and 30-AS on concentrations of desmin and tropomyosin. Inhibition of calpains stabilized desmin, but had no effect on tropomyosin. These data indicate that fodrin and desmin are mu-calpain substrates and that mu-calpain accounts for a small proportion of total protein degradation in muscle cells. Tropomyosin is not degraded by calpain in muscle cells." @default.
• W1977387616 created "2016-06-24" @default.
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• W1977387616 date "2003-04-01" @default.
• W1977387616 modified "2023-10-06" @default.
• W1977387616 title "Roles of μ-calpain in cultured L8 muscle cells: application of a skeletal muscle-specific gene expression system" @default.
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• W1977387616 doi "https://doi.org/10.1016/s1532-0456(03)00026-7" @default.
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