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Selective activation of FGFR4 by an FGF19 variant does not improve glucose metabolism in ob/ob mice. | LitMetric

AI Article Synopsis

Article Abstract

FGF19 is a hormone that regulates bile acid and glucose homeostasis. Progress has been made in identifying cofactors for receptor activation. However, several functions of FGF19 have not yet been fully defined, including the actions of FGF19 on target tissues, its FGF receptor specificity, and the contributions of other cofactors, such as heparin. Here, we explore the requirements for FGF19-FGFR/co-receptor interactions and signaling in detail. We show that betaKlotho was essential for FGF19 interaction with FGFRs 1c, 2c, and 3c, but FGF19 was able to interact directly with FGFR4 in the absence of betaKlotho in a heparin-dependent manner. Further, FGF19 activated FGFR4 signaling in the presence or absence of betaKlotho, but activation of FGFRs 1c, 2c, or 3c was completely betaKlotho dependent. We then generated an FGF19 molecule, FGF19dCTD, which has a deletion of the C-terminal region responsible for betaKlotho interaction. We determined that betaKlotho-dependent FGFR1c, 2c, and 3c interactions and activation were abolished, and betaKlotho-independent FGFR4 activation was preserved; therefore, FGF19dCTD is an FGFR4-specific activator. This unique FGF19 molecule specifically activated FGFR4-dependent signaling in liver and suppressed CYP7A1 expression in vivo, but was unable to activate signaling in adipose where FGFR4 expression is very low. Interestingly, unlike FGF19, treatment of ob/ob mice with FGF19dCTD failed to improve glucose levels and insulin sensitivity. These results suggest that FGF19-regulated liver bile acid metabolism could be independent of its glucose-lowering effect, and direct FGFR activation in adipose tissue may play an important role in the regulation of glucose homeostasis.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2726038PMC
http://dx.doi.org/10.1073/pnas.0907812106DOI Listing

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