L-Arginine promotes protein synthesis and cell growth in brown adipocyte precursor cells via the mTOR signal pathway.
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L-Arginine has been reported to enhance brown adipose tissue developments in fetal lambs of obese ewes, but the underlying mechanism is unknown. The present study tested the hypothesis that L-arginine stimulates growth and development of brown adipocyte precursor cells (BAPCs) through activation of mammalian target of rapamycin cell signaling. BAPCs isolated from fetal lambs at day 90 of gestation were incubated for 6h in arginine-free DMEM, and thencultured in DMEM with concentrations of 50, 100, 200, 500 or 1000mol L-arginine/L for 24-96h. Cell proliferation, protein turnover, the mammalian target of rapamycin (mTOR) signaling pathway and pre-adipocyte differentiation markers were determined. L-arginine treatment enhanced (P<0.05) BAPC growth and protein synthesis, while inhibiting proteolysis in a dose-dependent manner. Compared with 50 and 100mol/L (the concentrations of arginine in the maternal plasma of obese ewes), 200mol L-arginine/L (the concentrations of arginine in the maternal plasma of obese ewes receiving arginine supplementation) increased (P<0.05) the abundances of phosphorylated mTOR, P70S6K and 4EBP1, as well as the abundances of PGC1, UCP1, BMP7 and PRDM16. These novel findings indicate that increasingextra-cellular arginine concentration from 50 to 200 mol/Lactivates mTOR cell signaling in BAPCs and enhances their growth and development in a dose-dependent manner. Our results provide a mechanism for arginine supplementation to enhance the development of brown adipose tissue in fetal lambs.
