Abstract:
:Intermittent hypoxia (IH) during sleep induces temporally defined increases in apoptosis within vulnerable brain regions such as the hippocampal CA1 region in rats. Protein kinase B (AKT) has emerged as major signal transduction protein underlying inhibition of apoptosis and consequent increases in cell survival. Sprague Dawley adult male rats were exposed during sleep to IH or to normoxia (RA) for periods ranging from 0 to 30 days, and expression of total and phosphorylated AKT, of forkhead family members FKHR and FKHRL1, and of glycogen synthase kinase 3beta (GSK3beta) was assessed. Decreases in phosphorylation occurred as early as 1 h IH exposure, reached a nadir at 6 h-3 days, and then progressively returned to baseline levels at 14-30 days. Phosphorylated AKT and GSK3beta were intensely expressed and highly colocalized within neuronal cells (Neu-N positive) in the CA1 region. Thus, IH induces time-dependent biphasic changes in AKT survival pathways within the CA1 region that are temporally correlated with the initial increases and subsequent decreases in neuronal apoptosis.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Goldbart A,Cheng ZJ,Brittian KR,Gozal Ddoi
10.1016/j.nbd.2003.08.004keywords:
subject
Has Abstractpub_date
2003-12-01 00:00:00pages
440-6issue
3eissn
0969-9961issn
1095-953Xpii
S0969996103001608journal_volume
14pub_type
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