DOI: 10.1523/jneurosci.4619-08.2008. Polyglutamine-Modulated Striatal Calpain Activity in YAC Transgenic Huntington Disease Mouse Model: Impact on NMDA Receptor Function and Toxicity

Polyglutamine-Modulated Striatal Calpain Activity in YAC Transgenic Huntington Disease Mouse Model: Impact on NMDA Receptor Function and Toxicity

10.1523/jneurosci.4619-08.2008

Crossref journal-article

Society for Neuroscience

The Journal of Neuroscience (393)

Abstract

Huntington disease (HD), caused by CAG expansion in the ubiquitously expressed huntingtin gene, is characterized by early dysfunction and death of striatal medium-sized spiny neurons (MSNs). Previous work has shown MSN-specific alterations in NMDA receptor (NMDAR) expression and cell death signaling. Furthermore, studies in HD human brain tissue and a knock-in mouse model demonstrate increases in calpain activity, which can be stimulated by NMDARs and contribute to excitotoxicity. Here, we report increased calpain activity in MSNs from the yeast artificial chromosome (YAC) transgenic mouse model of HD, expressing human full-length huntingtin with 128 polyglutamine repeats (YAC128), compared with wild type. Moreover, the calpain-cleaved product of NMDAR subunit NR2B is increased early, and NR2B expression levels are reduced, in YAC128 striatum. Although steady-state NMDAR surface expression is similar in wild-type and YAC128 MSNs, the rate of loss of NR2B-containing surface receptors is enhanced in YAC128 MSNs, suggesting that NMDAR forward trafficking to the surface is also faster, as previously reported for YAC72 MSNs. Calpain inhibitor-1 treatment normalized the loss rate of surface NMDARs in YAC128 MSNs to that of wild type, and significantly increased surface NMDAR expression in YAC128, but not in wild type or YAC72. With acute NMDAR overstimulation, the increase in calpain activity correlated with polyglutamine length, and calpain inhibitor treatment reduced NMDA-induced apoptosis in YAC72 and YAC128 MSNs to wild-type levels. Thus, the cumulative effect of increasing huntingtin polyglutamine length is to enhance MSN sensitivity to excitotoxicity at least in part by calpain-mediated cell death signaling.

Bibliography

Cowan, C. M., Fan, M. M. Y., Fan, J., Shehadeh, J., Zhang, L. Y. J., Graham, R. K., Hayden, M. R., & Raymond, L. A. (2008). Polyglutamine-Modulated Striatal Calpain Activity in YAC Transgenic Huntington Disease Mouse Model: Impact on NMDA Receptor Function and Toxicity. The Journal of Neuroscience, 28(48), 12725â12735.

Authors 8

Catherine M. Cowan (first)
Mannie M. Y. Fan (additional)
Jing Fan (additional)
Jacqueline Shehadeh (additional)
Lily Y. J. Zhang (additional)
Rona K. Graham (additional)
Michael R. Hayden (additional)
Lynn A. Raymond (additional)

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Dates

Type	When
Created	16 years, 9 months ago (Nov. 26, 2008, 1:29 p.m.)
Deposited	6 months, 4 weeks ago (Feb. 4, 2025, 12:26 p.m.)
Indexed	2 months, 1 week ago (June 25, 2025, 6:06 p.m.)
Issued	16 years, 9 months ago (Nov. 26, 2008)
Published	16 years, 9 months ago (Nov. 26, 2008)
Published Online	16 years, 9 months ago (Nov. 26, 2008)
Published Print	16 years, 9 months ago (Nov. 26, 2008)

Funders 0

None

BibTeX

@article{Cowan_2008, title={Polyglutamine-Modulated Striatal Calpain Activity in YAC Transgenic Huntington Disease Mouse Model: Impact on NMDA Receptor Function and Toxicity}, volume={28}, ISSN={1529-2401}, url={http://dx.doi.org/10.1523/jneurosci.4619-08.2008}, DOI={10.1523/jneurosci.4619-08.2008}, number={48}, journal={The Journal of Neuroscience}, publisher={Society for Neuroscience}, author={Cowan, Catherine M. and Fan, Mannie M. Y. and Fan, Jing and Shehadeh, Jacqueline and Zhang, Lily Y. J. and Graham, Rona K. and Hayden, Michael R. and Raymond, Lynn A.}, year={2008}, month=nov, pages={12725–12735} }

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