Li Z, Liu W, Kang Z, Lv S, Han C, Yun L, Sun X, Zhang JH. Mechanism of hyperbaric oxygen preconditioning in neonatal hypoxia-ischemia rat model.
Brain Res 2007;
1196:151-6. [PMID:
18221732 DOI:
10.1016/j.brainres.2007.12.039]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Revised: 12/12/2007] [Accepted: 12/13/2007] [Indexed: 11/16/2022]
Abstract
Hypoxic ischemic (HI) injury in neonates damages brain tissues. We examined the mechanism of hyperbaric oxygen preconditioning (HBO-PC) in neonatal HI rat model. Seven-day-old rat pups were subjected to left common carotid artery ligation and hypoxia (8% oxygen at 37 degrees C) for 90 min. HBO (100% O(2), 2.5 atmospheres absolute for 2.5 h) were administered by placing pups in a chamber 24 h before HI insult. Brain injury was assessed by the survival rate, 2,3,5-triphenyltetrazolium chloride (TTC), Nissl, TUNEL straining and caspase-3,caspase-9 activities after HI. In HBO preconditioned animals, survival rate was increased, infarct ratio was decreased, and the positive stained TUNEL cells were reduced, accompanied by the suppression of caspase-3 and -9 activities. These results indicate that a single HBO-PC appears to provide brain protection against HI insult via inhibition of neuronal apoptosis pathways.
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