Chronic D-serine supplementation impairs insulin secretion

Lisa Suwandhi, Simone Hausmann, Alexander Braun, Tim Gruber, Silke S. Heinzmann, Eric J.C. Gálvez, Achim Buck, Beata Legutko, Andreas Israel, Annette Feuchtinger, Elizabeth Haythorne, Harald Staiger, Martin Heni, Hans Ulrich Häring, Philippe Schmitt-Kopplin, Axel Walch, Cristina García Cáceres, Matthias H. Tschöp, Guy A. Rutter, Till StrowigMartin Elsner, Siegfried Ussar

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

28 Zitate (Scopus)

Abstract

Objective: The metabolic role of D-serine, a non-proteinogenic NMDA receptor co-agonist, is poorly understood. Conversely, inhibition of pancreatic NMDA receptors as well as loss of the D-serine producing enzyme serine racemase have been shown to modulate insulin secretion. Thus, we aim to study the impact of chronic and acute D-serine supplementation on insulin secretion and other parameters of glucose homeostasis. Methods: We apply MALDI FT-ICR mass spectrometry imaging, NMR based metabolomics, 16s rRNA gene sequencing of gut microbiota in combination with a detailed physiological characterization to unravel the metabolic action of D-serine in mice acutely and chronically treated with 1% D-serine in drinking water in combination with either chow or high fat diet feeding. Moreover, we identify SNPs in SRR, the enzyme converting L-to D-serine and two subunits of the NMDA receptor to associate with insulin secretion in humans, based on the analysis of 2760 non-diabetic Caucasian individuals. Results: We show that chronic elevation of D-serine results in reduced high fat diet intake. In addition, D-serine leads to diet-independent hyperglycemia due to blunted insulin secretion from pancreatic beta cells. Inhibition of alpha 2-adrenergic receptors rapidly restores glycemia and glucose tolerance in D-serine supplemented mice. Moreover, we show that single nucleotide polymorphisms (SNPs) in SRR as well as in individual NMDAR subunits are associated with insulin secretion in humans. Conclusion: Thus, we identify a novel role of D-serine in regulating systemic glucose metabolism through modulating insulin secretion.

OriginalspracheEnglisch
Seiten (von - bis)191-202
Seitenumfang12
FachzeitschriftMolecular Metabolism
Jahrgang16
DOIs
PublikationsstatusVeröffentlicht - Okt. 2018

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