Aug 20, 2004

Effect of maternal nutrient restriction in sheep on the development of fetal skeletal muscle

Biology of Reproduction
Mei-Jun ZhuMin Du

Abstract

The effect of maternal nutrient restriction on mTOR (mammalian target of rapamyosin) signaling and the ubiquitin system as well as their possible relation to growth of fetal muscle was determined. Ewes were fed to 50% (nutrient-restricted) or 100% (control-fed) of total digestible nutrients (National Research Council requirement) from Days 28 to 78 of gestation. Ewes were killed at Day 78 of gestation, and the fetal longissimus dorsi muscle was sampled for the measurement of mTOR, ribosomal protein S6, AMP-activated protein kinase (AMPK), calpastatin, and protein ubiquitylation. No difference was observed in the content of mTOR and ribosomal protein S6, but the phosphorylation of mTOR at Ser2448 and ribosomal protein S6 at Ser235/336 were reduced (P <0.05) in muscle from nutrient-restricted fetuses. Because phosphorylation of mTOR and ribosomal protein S6 up-regulates protein translation, these results show that nutrient restriction down-regulates protein synthesis in fetal muscle. No difference in AMPK activity was detected. The lack of difference in calpastatin and ubiquitylized protein content shows that nutrient restriction did not affect degradation of myofibrillar proteins in fetal muscle. Fetuses of nutrient-restricted e...Continue Reading

Mentioned in this Paper

Eukaryotic Initiation Factor-4G
Short Stature, Auditory Canal Atresia, Mandibular Hypoplasia, Skeletal Abnormalities
Myoblasts
Metabolic Process, Cellular
Monoclonal Antibodies
MYOG wt Allele
Proteasome Pathway
Fetal Structures
Protein Degradation, Regulatory
Tissue Membrane

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