Abstract:
:Increased mitochondrial hydrogen peroxide (H2O2) is associated with Alzheimer's disease and brain aging. Peroxiredoxin 3 (Prdx3) is the key mitochondrial antioxidant defense enzyme in detoxifying H2O2. To investigate the importance of mitochondrial H2O2 in age-associated cognitive decline, we compared cognition between aged (17-19 months) APP transgenic mice and APP/Prdx3 double transgenic mice (dTG) and between old (24 months) wild-type mice and Prdx3 transgenic mice (TG). Compared with aged APP mice, aged dTG mice showed improved cognition that was correlated with reduced brain amyloid beta levels and decreased amyloid beta production. Old TG mice also showed significantly increased cognitive ability compared with old wild-type mice. Both aged dTG mice and old TG mice had reduced mitochondrial oxidative stress and increased mitochondrial function. Moreover, CREB signaling, a signaling pathway important for cognition was enhanced in both aged dTG mice and old TG mice. Thus, our results indicate that mitochondrial H2O2 is a key culprit of age-associated cognitive impairment, and that a reduction of mitochondrial H2O2 could improve cognition by maintaining mitochondrial health and enhancing CREB signaling.
journal_name
Neurobiol Agingjournal_title
Neurobiology of agingauthors
Chen L,Na R,Ran Qdoi
10.1016/j.neurobiolaging.2014.05.007subject
Has Abstractpub_date
2014-11-01 00:00:00pages
2552-2561issue
11eissn
0197-4580issn
1558-1497pii
S0197-4580(14)00345-5journal_volume
35pub_type
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