Rosiglitazone attenuates learning and memory deficits in Tg2576 Alzheimer mice

Experimental Neurology
Ward A PedersenGleb R Haynatzki

Abstract

The thiazolidinediones, such as rosiglitazone, increase peripheral insulin sensitivity and their use is proposed for the treatment of Alzheimer's disease. However, the mechanisms underlying the potential beneficial effects of rosiglitazone in Alzheimer's disease remain unclear. In previous studies, we observed that Tg2576 Alzheimer mice develop peripheral insulin resistance with age and have much higher serum corticosterone levels than wild-type mice when fasted overnight. We further showed that both of these defects can be ameliorated by rosiglitazone administration. Here, we report that during behavioral testing which involves repetitive overnight fasting, Tg2576 mice administered rosiglitazone exhibited better spatial learning and memory abilities and had lower serum corticosterone levels than untreated Tg2576 mice. When untreated Tg2576 mice were administered metyrapone, a drug that blocks glucocorticoid production, their spatial learning and memory abilities and serum corticosterone levels were similar to those of rosiglitazone-treated mice. We further report here that rosiglitazone attenuated reductions in insulin-degrading enzyme (IDE) mRNA and activity, and reduced amyloid beta-peptide (Abeta)42 levels without affecting...Continue Reading

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