FGFR1 forms an FRS2-dependent complex with mTOR to regulate smooth muscle marker gene expression |
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Authors: | Pei-Yu Chen Robert Friesel |
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Institution: | a Center for Molecular Medicine, Maine Medical Center Research Institute, 81 Research Drive, Scarborough, ME 04074-7205, USA b Cooperative Graduate Program in Molecular Genetics and Cell Biology, University of Maine, Orono, ME 04469, USA |
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Abstract: | Vascular smooth muscle cells (VSMCs) switch from a contractile to a synthetic phenotype in human cardiovascular disease such as atherosclerosis and restenosis after angioplasty. VSMCs show reduced expression of contractile proteins and are capable of responding to mitogens by increasing expression of growth factor receptors. Fibroblast growth factor receptor-1 (FGFR1) signaling is one of several signaling pathways involved in this VSMC phenotypic switching. The aim of this study was to examine the signaling pathway downstream of FGFR1 in the regulation of SM marker gene expression. We found that FGFR1 activated Akt/mTOR pathway and that the mTOR inhibitor rapamycin partially reversed FGFR1-mediated downregulation of SM marker gene expression. Furthermore, we showed that mTOR forms a multi-protein complex with FGFR1 in VSMCs. These findings provide novel information for future development of therapeutic strategies for the treatment of human cardiovascular disease. |
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Keywords: | FGFR1 FRS2 mTOR Rapamycin SM α-actin VSMC |
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