Abstract:
:Very recent studies in adult gerbils and rats have shown that exposure to sublethal ischemia can confer neuroprotection from subsequent lethal ischemic episodes. To determine if a similar phenomenon can be elicited during the perinatal period, we have developed a preconditioning regimen that involves exposure to normothermic hypoxia (8% oxygen) 24 h prior to hypoxia-ischemia in the well-established post-natal-day 7 rat pup model [20]. Significant infarction, manifested as a 34 +/- 4% reduction in cerebral hemispheric weight ipsilateral to the carotid ligation, was noted in control animals (n = 24) one week after hypoxia-ischemia, whereas littermates preconditioned with 3 h hypoxia (n = 29) showed no evidence of hemispheric necrosis. Lack of injury in the latter animals was confirmed at the cellular level by histopathologic analyses of Nissl-stained coronal sections. Thus, pre-exposure to hypoxia induces endogenous adaptive mechanisms that can protect the perinatal brain from hypoxic-ischemic injury.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Gidday JM,Fitzgibbons JC,Shah AR,Park TSdoi
10.1016/0304-3940(94)90455-3subject
Has Abstractpub_date
1994-02-28 00:00:00pages
221-4issue
1-2eissn
0304-3940issn
1872-7972pii
0304-3940(94)90455-3journal_volume
168pub_type
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