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Neurobiol Dis. 2008 Mar;29(3):409-21. Epub 2007 Oct 23.

Disruption of striatal glutamatergic transmission induced by mutant huntingtin involves remodeling of both postsynaptic density and NMDA receptor signaling.

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  • 1Departament de Biologia Cellular i Anatomia Patològica, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain.

Abstract

We study the striatal susceptibility to NMDA receptor (NMDAR)-mediated injury of two Huntington's disease (HD) transgenic mice: R6/1 and R6/1:BDNF(+/-). We found that R6/1:BDNF(+/-) mice--which express reduced levels of BDNF--were more resistant than R6/1 mice to intrastriatal injection of quinolinate. This increased resistance is related to a differential reduction in expression of NMDAR scaffolding proteins, MAGUKs (PSD-95, PSD-93, SAP-102 and SAP-97) but not to altered levels or synaptic location of NMDAR. A robust reorganization of postsynaptic density (PSD) was detected in HD transgenic mice, shown by a switch of PSD-93 by PSD-95 in PSD. Furthermore, NMDAR signaling pathways were affected by different BDNF levels in HD mice; we found a reduction of synaptic alpha CaMKII (but not of nNOS) in R6/1:BDNF(+/-) compared to R6/1 mice. The specific regulation of MAGUKs and alpha CaMKII in striatal neurons may reflect a protective mechanism against expression of mutant huntingtin exon-1.

PMID:
18063376
[PubMed - indexed for MEDLINE]
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