Myostatin expression is regulated by underfeeding and neonatal programming in rats.
Confusing results have been reported regarding the influence of nutritional status on myostatin levels. Some studies indicate that short-term fasting results in increased myostatin mRNA levels in skeletal muscle, evident in several species. In contrast, other studies have demonstrated either a decrease or no change in myostatin levels during fasting. In the present study, we investigated the effect of different patterns of food deprivation on muscle myostatin expression in both newborn and adult rats. Adjustment of litter size in neonatal rats is a well-established model to study the effect of early overfeeding or underfeeding on body composition and in this study resulted in modifications in the pattern of muscle myostatin expression. Rat pups growing in large litters (22-24 newborns) showed a decrease in muscle myostatin mRNA and protein levels at 24 days of age. Interestingly, these effects were maintained at 60 days of age despite rats having free access to food since weaning, thus suggesting that changes in myostatin expression induced by neonatal reduction of food intake are long-lasting. In contrast, no changes in myostatin mRNA levels were observed in adult rats when food intake was decreased during 7 days by either food restriction or central leptin treatment. Similar results were obtained when food restriction was maintained in adult rats for a longer period (7 weeks), despite significant muscle loss. Overall, these data suggest that myostatin gene expression is programmed by nutritional status in neonatal life.
Department of Physiology, School of Medicine, Instituto de Investigación Sanitaria, University of Santiago de Compostela, S. Francisco s/n, Santiago de Compostela, A Coruña, Spain.
Isabel
I
Carneiro
Tamara
T
González
Miguel
M
López
Rosa
R
Señarís
Jesús
J
Devesa
Víctor M
VM
Arce
D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D004435:Eating; D005260:Female; D005508:Food Deprivation; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D006963:Hyperphagia; D020738:Leptin / Q000494:pharmacology; D008098:Litter Size; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D055435:Myostatin / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D051381:Rats
D020738:Leptin; C525913:Mstn protein, rat; D055435:Myostatin; D012333:RNA, Messenger