DOI: 10.1046/j.1471-4159.2001.00482.x. Partial resistance to malonate‐induced striatal cell death in transgenic mouse models of Huntington's disease is dependent on age and CAG repeat length

Partial resistance to malonate‐induced striatal cell death in transgenic mouse models of Huntington's disease is dependent on age and CAG repeat length

10.1046/j.1471-4159.2001.00482.x

Crossref journal-article

Wiley

Journal of Neurochemistry (311)

Abstract

Transgenic Huntington's disease (HD) mice, expressing exon 1 of the HD gene with an expanded CAG repeat, are totally resistant to striatal lesion induced by excessive NMDA receptor activation. We now show that striatal lesions induced by the mitochondrial toxin malonate are reduced by 70–80% in transgenic HD mice compared with wild‐type littermate controls. This occurred in 6‐ and 12‐week‐old HD mice with 150 CAG repeats (line R6/2) and in 18‐week‐old, but not 6‐week‐old, HD mice with 115 CAG repeats (line R6/1). Therefore, we show for the first time that the resistance to neurotoxin in transgenic HD mice is dependent on both the CAG repeat length and the age of the mice. Importantly, most HD patients develop symptoms in adulthood and exhibit an inverse relationship between CAG repeat length and age of onset. Transgenic mice expressing a normal CAG repeat (18 CAG) were not resistant to malonate. Although endogenous glutamate release has been implicated in malonate‐induced cell death, glutamate release from striatal synaptosomes was not decreased in HD mice. Malonate‐induced striatal cell death was reduced by 50–60% in wild‐type mice when they were treated with either the NMDA receptor antagonist MK‐801 or the caspase inhibitor zVAD‐fmk. These two compounds did not reduce lesion size in transgenic R6/1 mice. This might suggest that NMDA receptor‐ and caspase‐mediated cell death pathways are inhibited and that the limited malonate‐induced cell death still occurring in HD mice is independent of these pathways. There were no changes in striatal levels of the two anti cell death proteins Bcl‐XL and X‐linked inhibitor of apoptosis protein (XIAP), before or after the lesion in transgenic HD mice. We propose that mutant huntingtin causes a sublethal grade of metabolic stress which is CAG repeat length‐dependent and results in up‐regulation over time of cellular defense mechanisms against impaired energy metabolism and excitotoxicity.

Bibliography

Hansson, O., Castilho, R. F., Korhonen, L., Lindholm, D., Bates, G. P., & Brundin, P. (2001). Partial resistance to malonateâinduced striatal cell death in transgenic mouse models of Huntingtonâs disease is dependent on age and CAG repeat length. Journal of Neurochemistry, 78(4), 694â703. Portico.

Authors 6

Oskar Hansson (first)
Roger F. Castilho (additional)
Laura Korhonen (additional)
Dan Lindholm (additional)
Gillian P. Bates (additional)
Patrik Brundin (additional)

References 54 Referenced 49

Dates

Type	When
Created	22 years, 5 months ago (March 12, 2003, 1:55 a.m.)
Deposited	1 year, 10 months ago (Oct. 18, 2023, 3:55 p.m.)
Indexed	1 month, 4 weeks ago (July 7, 2025, 1:25 a.m.)
Issued	24 years ago (Aug. 15, 2001)
Published	24 years ago (Aug. 15, 2001)
Published Online	23 years, 8 months ago (Dec. 20, 2001)
Published Print	24 years ago (Aug. 15, 2001)

Funders 0

None

BibTeX

@article{Hansson_2001, title={Partial resistance to malonate‐induced striatal cell death in transgenic mouse models of Huntington’s disease is dependent on age and CAG repeat length}, volume={78}, ISSN={1471-4159}, url={http://dx.doi.org/10.1046/j.1471-4159.2001.00482.x}, DOI={10.1046/j.1471-4159.2001.00482.x}, number={4}, journal={Journal of Neurochemistry}, publisher={Wiley}, author={Hansson, Oskar and Castilho, Roger F. and Korhonen, Laura and Lindholm, Dan and Bates, Gillian P. and Brundin, Patrik}, year={2001}, month=aug, pages={694–703} }

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