title: Nandrolone decanoate treatment affects sarcoplasmic reticulum Ca(2+) ATPase function in skinned rat slow- and fast-twitch fibres.
abstract: The effects of anabolic-androgenic steroid administration on the function of the sarcoplasmic reticulum (SR) pump were investigated in chemically skinned fibres from the extensor digitorum longus (EDL) and soleus muscles of sedentary rats. Twenty male rats were divided into two groups, one group received an intramuscular injection of nandrolone decanoate (15 mg x kg(-1)) weekly for 8 weeks, the second received similar weekly doses of vehicle (sterile peanut oil). Compared with control muscles, nandrolone decanoate treatment reduced SR Ca(2+) loading in EDL and soleus fibres by 49% and 29%, respectively. In control and treated muscles, the rate of Ca(2+) leakage depended on the quantity of Ca(2+) loaded. Furthermore, for similar SR Ca(2+) contents, the Ca(2+) leakage rate was not significantly modified by nandrolone decanoate treatment. Nandrolone decanoate treatment thus affects Ca (2+) uptake by the SR in a fibre-type dependent manner.
authors.affiliation: Laboratoire de Physiologie Générale, UMR CNRS 6018, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, BP 92208, 44322, Nantes Cedex 3, France.
authors.forename: Aicha
authors.initials: A
authors.lastname: Bouhlel
authors.forename: Wissam H
authors.initials: WH
authors.lastname: Joumaa
authors.forename: Claude
authors.initials: C
authors.lastname: Léoty
mesh_terms: D045930:Anabolic Agents / Q000494:pharmacology*; D000818:Animals; D002110:Caffeine / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D000252:Calcium-Transporting ATPases / Q000187:drug effects / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D018656:Muscle Fibers, Fast-Twitch / Q000187:drug effects* / Q000201:enzymology / Q000648:ultrastructure; D018657:Muscle Fibers, Slow-Twitch / Q000187:drug effects* / Q000201:enzymology / Q000648:ultrastructure; D018482:Muscle, Skeletal / Q000187:drug effects / Q000201:enzymology / Q000648:ultrastructure; D009277:Nandrolone / Q000031:analogs & derivatives* / Q000494:pharmacology*; D000077603:Nandrolone Decanoate; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D012503:Saponins / Q000494:pharmacology; D012519:Sarcoplasmic Reticulum / Q000187:drug effects / Q000378:metabolism*
chemical_list: D045930:Anabolic Agents; D010726:Phosphodiesterase Inhibitors; D012503:Saponins; D002110:Caffeine; D009277:Nandrolone; D000252:Calcium-Transporting ATPases; D000077603:Nandrolone Decanoate; D002118:Calcium