17-DMAG ameliorates polyglutamine-mediated motor neuron degeneration through well-preserved proteasome function in an SBMA model mouse.

Abstract:

:The ubiquitin-proteasome system (UPS) is the principal protein degradation system that tags and targets short-lived proteins, as well as damaged or misfolded proteins, for destruction. In spinal and bulbar muscular atrophy (SBMA), the androgen receptor (AR), an Hsp90 client protein, is such a misfolded protein that tends to aggregate in neurons. Hsp90 inhibitors promote the degradation of Hsp90 client proteins via the UPS. In a transgenic mouse model of SBMA, we examined whether a functioning UPS is preserved, if it was capable of degrading polyglutamine-expanded mutant AR, and what might be the therapeutic effects of 17-(dimethylaminoethylamino)-17-demethoxygeldanamycin (17-DMAG), an oral Hsp90 inhibitor. Ubiquitin-proteasomal function was well preserved in SBMA mice and was even increased during advanced stages when the mice developed severe phenotypes. Administration of 17-DMAG markedly ameliorated motor impairments in SBMA mice without detectable toxicity and reduced amounts of monomeric and nuclear-accumulated mutant AR. Mutant AR was preferentially degraded in the presence of 17-DMAG in both SBMA cell and mouse models when compared with wild-type AR. 17-DMAG also significantly induced Hsp70 and Hsp40. Thus, 17-DMAG would exert a therapeutic effect on SBMA via preserved proteasome function.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Tokui K,Adachi H,Waza M,Katsuno M,Minamiyama M,Doi H,Tanaka K,Hamazaki J,Murata S,Tanaka F,Sobue G

doi

10.1093/hmg/ddn419

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

898-910

issue

5

eissn

0964-6906

issn

1460-2083

pii

ddn419

journal_volume

18

pub_type

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