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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
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Figure 1

FGF-21 stimulates glucose uptake and modulates GLUT1 expression. The values (± SE) shown are the average of at least 3 independent measurements. *P < 0.02, **P < 0.001 compared with no stimulation or vehicle control. FGF-21 dose response on 3T3-L1 (A) and human primary adipocytes (B) in glucose uptake assay. (C) FGF-21 augments insulin activity. Cells were pretreated with or without FGF-21 and then stimulated with insulin as indicated. (D) Cycloheximide diminishes FGF-21 bioactivity in glucose uptake assay. 3T3-L1 adipocytes were stimulated with FGF-21 for 24 hours in the presence or absence of cycloheximide. P < 0.001 at all doses for FGF-21 versus FGF-21 plus cycloheximide stimulations. FGF-21 affects GLUT1 mRNA (E) and protein (F) levels and does not upregulate GLUT4 protein (F) in 3T3-L1 adipocytes (immunoblot). Cells were starved and then stimulated with FGF-21 or vehicle as indicated. Quantitative PCR and immunoblotting analyses were used to measure mRNA and protein levels, respectively. (G) GLUT1 mRNA is upregulated in adipose tissue of FGF-21–injected ob/ob mice. Two groups (5 animals each) of 8-week-old mice were injected s.c. with FGF-21 or vehicle. Quantitative PCR analysis was used to measure mRNA.