Journal
JOURNAL OF PSYCHOPHARMACOLOGY
Volume 25, Issue 8, Pages 1118-1125Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0269881110367723
Keywords
Melatonin; neurofilament; oxidative stress; protein phosphatase-2A; spatial memory retention; tau
Funding
- Natural Science Foundation of China [30700277, 30871035, 2006ABC005]
- Science and Technology Committee of China [2006CB500703]
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We have reported recently that inhibition of protein phosphatase (PP)-2A and PP-1 by calyculin A, a specific inhibitor of PP-2A and PP-1, induced Alzheimer-like hyperphosphorylation of tau and spatial memory retention impairment. In this study, we tested the in vivo effects of melatonin on these Alzheimer-like changes. We found that administration of melatonin intraperitoneally for 9 consecutive days before injection of calyculin A could prevent calyculin A-induced synaptophysin loss, memory retention deficits, as well as hyperphosphorylation of tau and neurofilaments. Furthermore, melatonin partially reversed the phosphorylation of the catalytic subunit of PP-2A at Tyrosine 307 (Y307), a crucial site negatively regulating the activity of PP-2A, and reduced the levels of malondialdehyde, a marker of oxidative stress, induced by calyculin A. These results suggest that melatonin could serve as a potential therapeutic agent for preventing Alzheimer-like pathological changes and behavioral abnormality via modulating the activity of PP-2A and oxidative stress.
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