N-linked glycosylation of cortical N-methyl-D-aspartate and kainate receptor subunits in schizophrenia.

Abstract:

:Dysfunctional glutamate neurotransmission has been implicated in the pathophysiology of schizophrenia. Abnormal expressions in schizophrenia of ionotropic glutamate receptors (iGluRs) and the proteins that regulate their trafficking have been found to be region and subunit specific in brain, suggesting that abnormal trafficking of iGluRs may contribute toward altered glutamatergic neurotransmission. The post-translational modification N-glycosylation of iGluR subunits can be used as a proxy for their intracellular localization. Receptor complexes assemble in the lumen of the endoplasmic reticulum, where N-glycosylation begins with the addition of N-linked oligomannose glycans, and is subsequently trimmed and replaced by more elaborate glycans while trafficking through the Golgi apparatus. Previously, we found abnormalities in N-glycosylation of the GluR2 AMPA receptor subunit in schizophrenia. Here, we investigated N-glycosylation of N-methyl-D-aspartate and kainate (KA) receptor subunits in the dorsolateral prefrontal cortex from patients with schizophrenia and a comparison group. We used enzymatic deglycosylation with two glycosidases: endoglycosidase H (Endo H), which removes immature high mannose-containing sugars, and peptide-N-glycosidase F (PNGase F), which removes all N-linked sugars. The NR1, NR2A, NR2B, GluR6, and KA2 subunits were all sensitive to treatment with Endo H and PNGase F. The GluR6 KA receptor subunit was significantly more sensitive to Endo H-mediated deglycosylation in schizophrenia, suggesting a larger molecular mass of N-linked high mannose and/or hybrid sugars on GluR6. This finding, taken with our previous work, suggests that a cellular mechanism underlying abnormal glutamate neurotransmission in schizophrenia may involve abnormal trafficking of both AMPA and KA receptors.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Tucholski J,Simmons MS,Pinner AL,McMillan LD,Haroutunian V,Meador-Woodruff JH

doi

10.1097/WNR.0b013e328363bd8a

subject

Has Abstract

pub_date

2013-08-21 00:00:00

pages

688-91

issue

12

eissn

0959-4965

issn

1473-558X

journal_volume

24

pub_type

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