17-AAG, an Hsp90 inhibitor, ameliorates polyglutamine-mediated motor neuron degeneration.
Heat-shock protein 90 ( Hsp90) functions as part of a multichaperone complex that folds, activates and assembles its client proteins. Androgen receptor ( AR), a pathogenic gene product in spinal and bulbar muscular atrophy (SBMA), is one of the Hsp90 client proteins. We examined the therapeutic effects of 17-allylamino-17-demethoxygeldanamycin (17-AAG), a potent Hsp90 inhibitor, and its ability to degrade polyglutamine-expanded mutant AR. Administration of 17-AAG markedly ameliorated motor impairments in the SBMA transgenic mouse model without detectable toxicity, by reducing amounts of monomeric and aggregated mutant AR. The mutant AR showed a higher affinity for Hsp90- p23 and preferentially formed an Hsp90 chaperone complex as compared to wild-type AR; mutant AR was preferentially degraded in the presence of 17-AAG in both cells and transgenic mice as compared to wild-type AR. 17-AAG also mildly induced Hsp70 and Hsp40. 17-AAG would thus provide a new therapeutic approach to SBMA and probably to other related neurodegenerative diseases.[1]References
- 17-AAG, an Hsp90 inhibitor, ameliorates polyglutamine-mediated motor neuron degeneration. Waza, M., Adachi, H., Katsuno, M., Minamiyama, M., Sang, C., Tanaka, F., Inukai, A., Doyu, M., Sobue, G. Nat. Med. (2005) [Pubmed]
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