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Alexei Kharitonenkov, Tatiyana L. Shiyanova, Anja Koester, Amy M. Ford, Radmila Micanovic, Elizabeth J. Galbreath, George E. Sandusky, Lisa J. Hammond, Julie S. Moyers, Rebecca A. Owens, Jesper Gromada, Joseph T. Brozinick, Eric D. Hawkins, Victor J. Wroblewski, De-Shan Li, Farrokh Mehrbod, S. Richard Jaskunas, Armen B. Shanafelt
Published in Volume 115, Issue 6
J Clin Invest. 2005; 115(6):1627–1635 doi:10.1172/JCI23606
Abstract | Full text | PDF
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Figure 2

FGF-21 stimulates phosphorylation in 3T3-L1 adipocytes. (A) FGF-21 induces phosphorylation of MAPK and FRS-2 in 3T3-L1 adipocytes. Upon stimulation, cells were lysed, and phospho-specific antibodies were used to determine phosphorylation of MAPK and FRS-2 in immunoblots. After immunoblots were stripped, anti-MAPK and anti–FRS-2 antibodies were used to confirm that protein loads were equal. For MAPK experiment, cells were stimulated with FGF-21 for the indicated times. For FRS-2 experiment, cells were stimulated with FGF-21 or FGF-1 (positive control). (B) FGF-21 stimulates tyrosine phosphorylation of FGFR-1 and FGFR-2 in 3T3-L1 adipocytes. Cells were stimulated with FGF-21 and lysed. FGFR-1 and FGFR-2 immunoprecipitates were analyzed in immunoblots with anti-phosphotyrosine antibodies. After stripping, anti–FGFR-1 and anti-FGFR-2 antibodies were used to confirm that protein loads were equal. pErk, phospho-Erk; PY, phosphotyrosine.