PuSH - Publication Server of Helmholtz Zentrum München: Point mutation of <em>Ffar1 </em>abrogates fatty acid-dependent insulin secretion, but protects against HFD-induced glucose intolerance.

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Sabrautzki, S. ; Kaiser, G. ; Przemeck, G.K.H. ; Gerst, F. ; Lorza-Gil, E. ; Panse, M.* ; Sartorius, T.* ; Hoene, M.* ; Marschall, S. ; Häring, H.-U. ; Hrabě de Angelis, M. ; Ullrich, S.

Point mutation of Ffar1 abrogates fatty acid-dependent insulin secretion, but protects against HFD-induced glucose intolerance.

Mol. Metab. 6, 1304-1312 (2017)

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Objective The fatty acid receptor 1 (FFAR1/GPR40) mediates fatty acid-dependent augmentation of glucose-induced insulin secretion (GIIS) in pancreatic β-cells. Genetically engineered Ffar1-knockout/congenic mice univocally displayed impaired fatty acid-mediated insulin secretion, but in vivo experiments delivered controversial results regarding the function of FFAR1 in glucose homeostasis and liver steatosis. This study presents a new coisogenic mouse model carrying a point mutation in Ffar1 with functional consequence. These mice reflect the situations in humans in which point mutations can lead to protein malfunction and disease development. Methods The Munich N-ethyl-N-nitrosourea (ENU) mutagenesis-derived F1 archive containing over 16,800 sperms and corresponding DNA samples was screened for mutations in the coding region of Ffar1. Two missense mutations (R258W and T146S) in the extracellular domain of the protein were chosen and homozygote mice were generated. The functional consequence of these mutations was examined in vitro in isolated islets and in vivo in chow diet and high fat diet fed mice. Results Palmitate, 50 μM, and the FFAR1 agonist TUG-469, 3 μM, stimulated insulin secretion in islets of Ffar1^T146S/T146S mutant mice and of wild-type littermates, while in islets of Ffar1^R258W/R258W mutant mice, these stimulatory effects were abolished. Insulin content and mRNA levels of Ffar1, Glp1r, Ins2, Slc2a2, Ppara, and Ppard were not significantly different between wild type and Ffar1^R258W/R258W mouse islets. Palmitate exposure, 600 μM, significantly increased Ppara mRNA levels in wild type but not in Ffar1^R258W/R258W mouse islets. On the contrary, Slc2a2 mRNA levels were significantly reduced in both wild type and Ffar1^R258W/R258W mouse islets after palmitate treatment. HFD feeding induced glucose intolerance in wild-type mice. Ffar1^R258W/R258W mutant mice remained glucose tolerant although their body weight gain, liver steatosis, insulin resistance, and plasma insulin levels were not different from those of wild-type littermates. Worth mentioning, fasting plasma insulin levels were lower in Ffar1^R258W/R258W mice. Conclusion A point mutation in Ffar1 abrogates the stimulatory effect of palmitate on GIIS, an effect that does not necessarily translate to HFD-induced glucose intolerance.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords FFAR1/GPR40; Free fatty acids; Insulin secretion; ENU-mutated Ffar1; FFAR1 deficient mice; High fat diet; Pancreatic Beta-cells; Glucagon-secretion; Receptor 1; Gene-expression; In-vitro; Gpr40; Agonist; Tak-875; Stimulation; Mouse

ISSN (print) / ISBN 2212-8778

e-ISSN 2212-8778

Journal Molecular Metabolism

Quellenangaben Volume: 6, Issue: 10, Pages: 1304-1312

Publisher Elsevier

Publishing Place Amsterdam

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Diabetes Research and Metabolic Diseases (IDM)
Institute of Experimental Genetics (IEG)
CF Comparative Medicine (CF-Comparative Medicine)