期刊
AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY
卷 285, 期 4, 页码 L802-L807出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajplung.00266.2002
关键词
isoproterenol; rapamycin; mitogen-activated protein kinase; phosphatidylinositol 3-kinase; lung
资金
- NHLBI NIH HHS [HL-48129] Funding Source: Medline
We have recently reported that the beta-adrenergic agonist isoproterenol regulates the alveolar epithelial cell Na-K-ATPase via MAPK/extracellular signal-regulated kinase and rapamycin-sensitive pathways. Here we report that isoproterenol phosphorylated the protein S6 kinase (p70(S6k)) in alveolar epithelial cells, which was inhibited by both rapamycin and the MEK1/2 inhibitor U-0126. In alveolar epithelial cells transfected with a p70(S6k) dominant negative construct, isoproterenol did not increase Na-K-ATPase total protein expression, whereas in cells transfected with a rapamycin-resistant mutant, the isoproterenol-mediated increase in Na-K-ATPase was not prevented by rapamycin. Accordingly, we provide here first evidence that isoproterenol regulates Na-K-ATPase via p70(S6k) in alveolar epithelial cells.
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