| First Author | Niu J | Year | 2020 |
| Journal | Proc Natl Acad Sci U S A | Volume | 117 |
| Issue | 46 | Pages | 29025-29034 |
| PubMed ID | 33144503 | Mgi Jnum | J:300044 |
| Mgi Id | MGI:6477528 | Doi | 10.1073/pnas.2010984117 |
| Citation | Niu J, et al. (2020) Curtailing FGF19's mitogenicity by suppressing its receptor dimerization ability. Proc Natl Acad Sci U S A 117(46):29025-29034 |
| abstractText | As a physiological regulator of bile acid homeostasis, FGF19 is also a potent insulin sensitizer capable of normalizing plasma glucose concentration, improving lipid profile, ameliorating fatty liver disease, and causing weight loss in both diabetic and diet-induced obesity mice. There is therefore a major interest in developing FGF19 as a therapeutic agent for treating type 2 diabetes and cholestatic liver disease. However, the known tumorigenic risk associated with prolonged FGF19 administration is a major hurdle in realizing its clinical potential. Here, we show that nonmitogenic FGF19 variants that retain the full beneficial glucose-lowering and bile acid regulatory activities of WT FGF19 (FGF19(WT)) can be engineered by diminishing FGF19's ability to induce dimerization of its cognate FGF receptors (FGFR). As proof of principle, we generated three such variants, each with a partial defect in binding affinity to FGFR (FGF19(DeltaFGFR)) and its coreceptors, i.e., betaklotho (FGF19(DeltaKLB)) or heparan sulfate (FGF19(DeltaHBS)). Pharmacological assays in WT and db/db mice confirmed that these variants incur a dramatic loss in mitogenic activity, yet are indistinguishable from FGF19(WT) in eliciting glycemic control and regulating bile acid synthesis. This approach provides a robust framework for the development of safer and more efficacious FGF19 analogs. |
