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Biochem Biophys Res Commun. 2009 Aug 14;386(1):257-62. doi: 10.1016/j.bbrc.2009.06.032. Epub 2009 Jun 10.

Deletion of Irs2 reduces amyloid deposition and rescues behavioural deficits in APP transgenic mice.

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  • 1King's College London, MRC Centre for Neurodegenerative Research, Institute of Psychiatry, De Crespigny Park, London, SE5 8AF, UK.

Abstract

As impaired insulin signalling (IIS) is a risk factor for Alzheimer's disease we crossed mice (Tg2576) over-expressing human amyloid precursor protein (APP), with insulin receptor substrate 2 null (Irs2(-/-)) mice which develop insulin resistance. The resulting Tg2576/Irs2(-/-) animals had increased tau phosphorylation but a paradoxical amelioration of Abeta pathology. An increase of the Abeta binding protein transthyretin suggests that increased clearance of Abeta underlies the reduction in plaques. Increased tau phosphorylation correlated with reduced tau-phosphatase PP2A, despite an inhibition of the tau-kinase glycogen synthase kinase-3. Our findings demonstrate that disruption of IIS in Tg2576 mice has divergent effects on pathological processes-a reduction in aggregated Abeta but an increase in tau phosphorylation. However, as these effects are accompanied by improvement in behavioural deficits, our findings suggest a novel protective effect of disrupting IRS2 signalling in AD which may be a useful therapeutic strategy for this condition.

PMID:
19523444
[PubMed - indexed for MEDLINE]
PMCID:
PMC2726921
Free PMC Article

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