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Nutrients 2018, 10(4), 473; https://doi.org/10.3390/nu10040473

Coordination of GPR40 and Ketogenesis Signaling by Medium Chain Fatty Acids Regulates Beta Cell Function

1
Islet Function, Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne, Switzerland
2
Lipidomics, Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne, Switzerland
3
Natural Bioactives Screening, Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne, Switzerland
4
Brain Health, Nestlé Institute of Health Sciences (NIHS), EPFL Innovation Park, 1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Received: 29 January 2018 / Revised: 26 March 2018 / Accepted: 10 April 2018 / Published: 12 April 2018
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Abstract

Diabetes prevalence increases with age, and β-cell dysfunction contributes to the incidence of the disease. Dietary lipids have been recognized as contributory factors in the development and progression of the disease. Unlike long chain triglycerides, medium chain triglycerides (MCT) increase fat burning in animal and human subjects as well as serum C-peptide in type 2 diabetes patients. We evaluated the beneficial effects of MCT on β-cells in vivo and in vitro. MCT improved glycemia in aged rats via β-cell function assessed by measuring insulin secretion and content. In β-cells, medium chain fatty acid (MCFA)-C10 activated fatty acid receptor 1 FFAR1/GPR40, while MCFA-C8 induced mitochondrial ketogenesis and the C8:C10 mixture improved β cell function. We showed that GPR40 signaling positively impacts ketone body production in β-cells, and chronic treatment with β-hydroxybutyrate (BHB) improves β-cell function. We also showed that BHB and MCFA help β-cells recover from lipotoxic stress by improving mitochondrial function and increasing the expression of genes involved in β-cell function and insulin biogenesis, such as Glut2, MafA, and NeuroD1 in primary human islets. MCFA offers a therapeutic advantage in the preservation of β-cell function as part of a preventative strategy against diabetes in at risk populations. View Full-Text
Keywords: insulin secretion; mitochondria; medium chain fatty acid; lipotoxicity; ketogenesis; BHB; GPR40 insulin secretion; mitochondria; medium chain fatty acid; lipotoxicity; ketogenesis; BHB; GPR40
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pujol, J.B.; Christinat, N.; Ratinaud, Y.; Savoia, C.; Mitchell, S.E.; Dioum, E.H.M. Coordination of GPR40 and Ketogenesis Signaling by Medium Chain Fatty Acids Regulates Beta Cell Function. Nutrients 2018, 10, 473.

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