title: Effect of swimming on myostatin expression in white and red gastrocnemius muscle and in cardiac muscle of rats.
abstract: The aim of this study was to test the hypothesis that swimming training might impact differentially myostatin expression in skeletal muscles, depending on fibre type composition, and in cardiac muscle of rats. Myostatin expression was analysed by real time reverse transcriptase-polymerase chain reaction, Western blot and immunohistochemistry of the red deep portion (mainly composed of slow and type II A fibres) and in the superficial, white portion (composed of fast type II X and II B fibres) of the gastrocnemius muscle in adult male Wistar rats: (i) subjected to two consecutive swimming bouts for 3 h; (ii) subjected to intensive swimming training for 4 weeks; and (iii) sedentary control rats. Myostatin mRNA content was in all cases higher in white than in red muscles. Two bouts of swimming did not alter myostatin expression, whereas swimming training for 4 weeks resulted in a significant reduction of myostatin mRNA contents, significant both in white and red muscles but more pronounced in white muscles. Western blot did not detect any change in the amount of myostatin protein. Immunohistochemistry showed that, in control rats, myostatin was localized in presumptive satellite cells of a few muscle fibres. After training, the number of myostatin-positive spots decreased significantly. Myostatin mRNA content in cardiac muscle was lower than in skeletal muscle and was significantly increased by swimming training. In conclusion, the results obtained showed that intense training caused a decreased expression of myostatin mRNA in white and red skeletal muscles but an increase in cardiac muscle.
authors.affiliation: Department of Human Anatomy and Physiology, (Instituto Interuniversitario di Miologia) University of Padova, 35020 Legnaro, Padova, Italy.
authors.forename: Antonios
authors.initials: A
authors.lastname: Matsakas
authors.forename: Cyrille
authors.initials: C
authors.lastname: Bozzo
authors.forename: Nicola
authors.initials: N
authors.lastname: Cacciani
authors.forename: Francesca
authors.initials: F
authors.lastname: Caliaro
authors.forename: Carlo
authors.initials: C
authors.lastname: Reggiani
authors.forename: Francesco
authors.initials: F
authors.lastname: Mascarello
authors.forename: Marco
authors.initials: M
authors.lastname: Patruno
mesh_terms: D000818:Animals; D005786:Gene Expression Regulation; D006019:Glycolysis / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism*; D055435:Myostatin; D010084:Oxidation-Reduction; D010807:Physical Endurance / Q000502:physiology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013550:Swimming / Q000502:physiology*; D016212:Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism*
chemical_list: C525913:Mstn protein, rat; D055435:Myostatin; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta