Glycolytic Flux Controls D-serine Synthesis Through Glyceraldehyde-3-phosphate Dehydrogenase in Astrocytes

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2015 Apr 15

PMID 25870284

Citations 21

Authors

Masataka Suzuki

Jumpei Sasabe

Yurika Miyoshi

Kanako Kuwasako

Yutaka Muto

Kenji Hamase

Masaaki Matsuoka

Nobuaki Imanishi

Sadakazu Aiso

Affiliations

Soon will be listed here.

Abstract

D-Serine is an essential coagonist with glutamate for stimulation of N-methyl-D-aspartate (NMDA) glutamate receptors. Although astrocytic metabolic processes are known to regulate synaptic glutamate levels, mechanisms that control D-serine levels are not well defined. Here we show that d-serine production in astrocytes is modulated by the interaction between the D-serine synthetic enzyme serine racemase (SRR) and a glycolytic enzyme, glyceraldehyde 3-phosphate dehydrogenase (GAPDH). In primary cultured astrocytes, glycolysis activity was negatively correlated with D-serine level. We show that SRR interacts directly with GAPDH, and that activation of glycolysis augments this interaction. Biochemical assays using mutant forms of GAPDH with either reduced activity or reduced affinity to SRR revealed that GAPDH suppresses SRR activity by direct binding to GAPDH and through NADH, a product of GAPDH. NADH allosterically inhibits the activity of SRR by promoting the disassociation of ATP from SRR. Thus, astrocytic production of D-serine is modulated by glycolytic activity via interactions between GAPDH and SRR. We found that SRR is expressed in astrocytes in the subiculum of the human hippocampus, where neurons are known to be particularly vulnerable to loss of energy. Collectively, our findings suggest that astrocytic energy metabolism controls D-serine production, thereby influencing glutamatergic neurotransmission in the hippocampus.

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