Basal, but not overload-induced, myonuclear addition is attenuated by NG-nitro-L-arginine methyl ester (L-NAME) administration |
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Authors: | Gordon Scott E Westerkamp Christopher M Savage Kathleen J Hickner Robert C George Sarah C Fick Christopher A McCormick Kathleen M |
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Institution: | Human Performance Laboratory, Department of Exercise and Sport Science, East Carolina University, Greenville, NC 27858, USA. gordonsc@ecu.edu |
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Abstract: | The purpose of this study was to examine the effect of blocking nitric oxide synthase (NOS) activity via NG-nitro-L-arginine methyl ester (L-NAME) on myonuclear addition in skeletal muscle under basal and overloaded conditions. Female Sprague-Dawley rats (approx. 220 g) were placed into 1 of the following 4 groups (n = 7-9/group): 7-day skeletal muscle overload (O), sham operation (S), skeletal muscle overload with L-NAME treatment (OLN), and sham operation with L-NAME treatment (SLN). Plantaris muscles were overloaded via bilateral surgical ablation of the gastrocnemius muscles and L-NAME (0.75 mg/mL) was administered in the animals' daily drinking water starting 2 days prior to surgery and continued until sacrifice. Myonuclear addition was assessed as subsarcolemmal incorporation of nuclei labeled with 5-bromo-2'-deoxyuridine (approx. 25 mg.(kg body mass)-1.day-1) delivered via osmotic pump during the overload period. As expected, muscle wet mass, total protein content, fiber cross-sectional area, and myonuclear addition were significantly higher (p
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