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Neuronal targets for reducing mutant huntingtin expression to ameliorate disease in a mouse model of Huntington's disease.

Abstract：

:Huntington's disease (HD) is a fatal dominantly inherited neurodegenerative disorder caused by a CAG repeat expansion leading to an elongated polyglutamine stretch in huntingtin. Mutant huntingtin (mHTT) is ubiquitously expressed in all cells but elicits selective cortical and striatal neurodegeneration in HD. The mechanistic basis for such selective neuronal vulnerability remains unclear. A necessary step toward resolving this enigma is to define the cell types in which mHTT expression is causally linked to the disease pathogenesis. Using a conditional transgenic mouse model of HD, in which the mice express full-length human mHTT from a bacterial artificial chromosome transgene (BACHD), we genetically reduced mHTT expression in neuronal populations in the striatum, cortex or both. We show that reduction of cortical mHTT expression in BACHD mice partially improves motor and psychiatric-like behavioral deficits but does not improve neurodegeneration, whereas reduction of mHTT expression in both neuronal populations consistently ameliorates all behavioral deficits and selective brain atrophy in this HD model. Furthermore, whereas reduction of mHTT expression in cortical or striatal neurons partially ameliorates corticostriatal synaptic deficits, further restoration of striatal synaptic function can be achieved by reduction of mHTT expression in both neuronal cell types. Our study demonstrates distinct but interacting roles of cortical and striatal mHTT in HD pathogenesis and suggests that optimal HD therapeutics may require targeting mHTT in both cortical and striatal neurons.

journal_name

Nat Med

journal_title

Nature medicine

authors

Wang N,Gray M,Lu XH,Cantle JP,Holley SM,Greiner E,Gu X,Shirasaki D,Cepeda C,Li Y,Dong H,Levine MS,Yang XW

doi

10.1038/nm.3514

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

536-41

issue

5

eissn

1078-8956

issn

1546-170X

pii

nm.3514

journal_volume

20

pub_type

杂志文章

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