Fibroblast growth factor-10 upregulates Na,K-ATPase via the MAPK pathway |
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Authors: | Upadhyay D Lecuona E Comellas A Kamp D W Sznajder J I |
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Institution: | Division of Pulmonary and Critical Care Medicine, Northwestern University Medical School, Chicago, IL 60611, USA. upadhyayd@pol.net |
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Abstract: | We studied the effects of fibroblast growth factor (FGF-10) on alveolar epithelial cell (AEC) Na,K-ATPase regulation. Within 30 min FGF-10 increased Na,K-ATPase activity and alpha1 protein abundance by 2.5-fold at the AEC plasma membrane. Pretreatment of AEC with the mitogen-activated protein kinase (MAPK) inhibitor U0126, a Grb2-SOS inhibitor (SH3-b-p peptide), or a Ras inhibitor (farnesyl transferase inhibitor (FTI 277)), as well as N17-AEC that express a Ras dominant negative protein each prevented FGF-10-mediated Na,K-ATPase recruitment to the AEC plasma membrane. Accordingly, we provide first evidence that FGF-10 upregulates (short-term) the Na,K-ATPase activity in AEC via the Grb2-SOS/Ras/MAPK pathway. |
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