Two myogenic regulatory factor transcripts exhibit muscle-specific responses to disuse and passive stretch in adult rats.
Levels of myogenic regulatory factor (MRF) transcripts are altered in a muscle-specific manner in response to hind limb immobilisation of adult male rats, for a 2 day period, in either a lengthened or shortened position which result in passive stretch or disuse atrophy respectively. Myogenin transcript levels were dramatically elevated in the stretched plantaris but not soleus, whereas the MRF4 transcript was significantly elevated in soleus but not plantaris. Levels of myogenin mRNA were unaffected by disuse in either muscle and MRF4 was markedly lower in plantaris in response to disuse.
Loughna
P T
PT
Department of Veterinary Basic Sciences, Royal Veterinary College, London, UK.
Brownson
C
C
D000818:Animals; D015152:Blotting, Northern; D007103:Immobilization; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000378:metabolism / Q000502:physiology*; D018006:Myogenic Regulatory Factors / Q000235:genetics* / Q000378:metabolism; D018008:Myogenin / Q000235:genetics / Q000378:metabolism; D009929:Organ Size; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
C503803:Myog protein, rat; D018006:Myogenic Regulatory Factors; D018008:Myogenin; D012333:RNA, Messenger; D014157:Transcription Factors; C063403:myogenic factor 6