A rational mechanism for combination treatment of Huntington's disease using lithium and rapamycin.

Abstract:

:Huntington's disease (HD) is caused by a polyglutamine expansion mutation in the huntingtin protein that confers a toxic gain-of-function and causes the protein to become aggregate-prone. Aggregate-prone proteins are cleared by macroautophagy, and upregulating this process by rapamycin, which inhibits the mammalian target of rapamycin (mTOR), attenuates their toxicity in various HD models. Recently, we demonstrated that lithium induces mTOR-independent autophagy by inhibiting inositol monophosphatase (IMPase) and reducing inositol and IP3 levels. Here we show that glycogen synthase kinase-3beta (GSK-3beta), another enzyme inhibited by lithium, has opposite effects. In contrast to IMPase inhibition that enhances autophagy, GSK3beta inhibition attenuates autophagy and mutant huntingtin clearance by activating mTOR. In order to counteract the autophagy inhibitory effects of mTOR activation resulting from lithium treatment, we have used the mTOR inhibitor rapamycin in combination with lithium. This combination enhances macroautophagy by mTOR-independent (IMPase inhibition by lithium) and mTOR-dependent (mTOR inhibition by rapamycin) pathways. We provide proof-of-principle for this rational combination treatment approach in vivo by showing greater protection against neurodegeneration in an HD fly model with TOR inhibition and lithium, or in HD flies treated with rapamycin and lithium, compared with either pathway alone.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Sarkar S,Krishna G,Imarisio S,Saiki S,O'Kane CJ,Rubinsztein DC

doi

10.1093/hmg/ddm294

subject

Has Abstract

pub_date

2008-01-15 00:00:00

pages

170-8

issue

2

eissn

0964-6906

issn

1460-2083

pii

ddm294

journal_volume

17

pub_type

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