Enteral leucine supplementation increases protein synthesis in skeletal and cardiac muscles and visceral tissues of neonatal pigs through mTORC1-dependent pathways.

Enteral leucine supplementation increases protein synthesis in skeletal and cardiac muscles and visceral tissues of neonatal pigs through mTORC1-dependent pathways.
复制标题

DOI:
10.1038/pr.2011.79
复制
发表时间:
2012-04
期刊:
影响因子:
3.6
通讯作者:
Davis, Teresa A.
Davis, Teresa A.
中科院分区:
医学3区
文献类型:
--
作者:
Suryawan, Agus;Torrazza, Roberto Murgas;Gazzaneo, Maria C.;Orellana, Renan A.;Fiorotto, Marta L.;El-Kadi, Samer W.;Srivastava, Neeraj;Nguyen, Hanh V.;Davis, Teresa A.

文献摘要

参考文献

被引文献

相似文献

亮氨酸(Leu)激活哺乳动物雷帕霉素靶蛋白(mTOR)以上调蛋白质合成(PS)。为了研究肠道亮氨酸对PS和信号激活的影响,5日龄仔猪饲喂24 h的日粮,其中包括:1)低蛋白(LP),2)LP+亮氨酸(LP+L),3)高蛋白(HP)。LP+L组骨骼肌、心脏、肝脏、胰腺和空肠的PS高于LP组,但低于HP组,但肾脏除外。在背最长肌中,LP和LP+L的蛋白激酶B磷酸化相似,但低于HP。虽然低于HP,但LP+L中p70核糖体S6激酶1(S6K1)和真核起始因子(eIF)4E结合蛋白1(4EBP 1)与哺乳动物雷帕霉素靶点的调节相关蛋白的结合比LP更强,导致更高的S6K1和4EBP 1磷酸化。LP+L组与LP组相比,4EBP 1·eIF4E减少,eIF4E·eIF4G增加,但对HP无影响。在腓肠肌、咬肌、心脏、肝脏、胰腺和空肠中获得了S6K1和4EBP 1磷酸化的类似结果,但在肾脏中没有。eIF2α和延伸因子2磷酸化不受处理影响。我们的研究结果表明,肠内补充亮氨酸的低蛋白饮食增强PS在大多数组织中通过mTOR复合物1途径。
Leucine (Leu) activates mammalian target of rapamycin (mTOR) to upregulate protein synthesis (PS). To examine enteral Leu effects on PS and signaling activation, 5-d-old piglets were fed for 24 h diets containing: 1) low protein (LP), 2) LP supplemented with Leu (LP+L), or 3) high protein (HP). PS in skeletal muscles, heart, liver, pancreas, and jejunum, but not kidney, were greater in LP+L than LP, but lower than HP. In longissimus dorsi muscle, protein kinase B phosphorylation was similar in LP and LP+L, but lower than HP. Although less than HP, p70 ribosomal S6 kinase 1 (S6K1) and eukaryotic initiation factor (eIF) 4E binding protein 1 (4EBP1) association with regulatory associated protein of mammalian target of rapamycin was greater in LP+L than LP, resulting in higher S6K1 and 4EBP1 phosphorylation. Feeding LP+L versus LP decreased 4EBP1·eIF4E and increased eIF4E·eIF4G formation, but not to HP. Similar results were obtained for S6K1 and 4EBP1 phosphorylation in gastrocnemius, masseter, heart, liver, pancreas, and jejunum, but not kidney. eIF2α and elongation factor 2 phosphorylation was unaffected by treatment. Our results suggest that enteral Leu supplementation of a low protein diet enhances PS in most tissues through mTOR complex 1 pathways.
DOI: 10.1152/ajpendo.1999.277.1.e103
发表时间: 1999-07-01
影响因子: 5.1
作者:
Davis, TA;Fiorotto, ML;Burrin, DG
通讯作者: Burrin, DG
DOI: 10.1016/s0022-3476(72)80395-0
发表时间: 1972-01-01
影响因子: 5.1
作者:
JOHNSON, JD;SUNSHINE, P;ALBRITTON, WL
通讯作者: ALBRITTON, WL
DOI: 10.1097/mco.0b013e3282fa17fb
发表时间: 2008-05-01
影响因子: 3.1
作者:
Drummond, Micah J.;Rasmussen, Blake B.
通讯作者: Rasmussen, Blake B.
DOI: 10.1152/ajpendo.00510.2004
发表时间: 2005-05-01
影响因子: 5.1
作者:
Escobar, J;Frank, JW;Davis, TA
通讯作者: Davis, TA
DOI: 10.1203/pdr.0b013e31820263e7
发表时间: 2011-02-01
期刊: PEDIATRIC RESEARCH
影响因子: 3.6
作者:
Abdelhamid, Adel E.;Chuang, Shu-Ling;Fell, John M. E.
通讯作者: Fell, John M. E.