Variations of brain edema and neurological function of rat models of cerebral infarction after hyperbaric oxygen therapy
10.3969/j.issn.2095-4344.2015.40.006
- VernacularTitle:高压氧干预脑梗死模型大鼠脑水肿及神经功能变化
- Author:
Xuan TIAN
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2015;(40):6423-6428
- CountryChina
- Language:Chinese
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Abstract:
BACKGROUND:Several studies have suggested that hyperbaric oxygen could better protect cranial nerve and brain cels. Hyperbaric oxygen therapy can make oxygen partial pressure rapidly diffusing toward relatively hypoxic brain tissue, so as to increase blood oxygen content in the brain tissue, reduce brain edema and promote the recovery of brain function. OBJECTIVE: To observe the effects of hyperbaric oxygen therapy on brain tissue sweling in rats after middle cerebral artery occlusion, and discuss the possible mechanism of action underlying the neuroprotective effects of hyperbaric oxygen therapy in rats with cerebral infraction. METHODS:Sixty adult female rat models of cerebral infarction were successfuly established by middle cerebral artery occlusion using suture method and then randomly divided into the sham, cerebral infarction and hyperbaric oxygen therapy groups (n=20 rats/group). At 3 days after middle cerebral artery occlusion, apoptosis of nerve cels in the infract area of rats in each group was detected by TUNEL method. At 72 hours after middle cerebral artery occlusion, the gene transcription and protein expression of aquaporin 4/9 and matrix metaloproteinases 9/2 in the peri-infarct area were detected by RT-PCR and western blot analysis. The pathomorphological change in the infract area was observed by hematoxylin-eosin staining. The expression level of glial fibrilary acidic protein was detected by immunohistochemistry. At 24 hours and 3 days after hyperbaric oxygen therapy and at 1 and 2 weeks after middle cerebral artery occlusion, neurological behaviors were evaluated using Longa behavioral scores. RESULTS AND CONCLUSION:After 1, 2 days of hyperbaric oxygen therapy, Longa behavioral scores in the hyperbaric oxygen therapy group were significantly lower than those in the cerebral infarction group (P < 0.05). At 3 days after middle cerebral artery occlusion, cel apoptosis index in the hyperbaric oxygen therapy group was significantly lower than that in the cerebral infarction group (P < 0.05). At 72 hours after middle cerebral artery occlusion, the aquaporin 4/9, matrix metaloproteinases 9/2 gene and protein expression in the hyperbaric oxygen group were significantly lower than those in the cerebral infarction group (P < 0.05). These results suggest that hyperbaric oxygen therapy can play its protective role by decreasing apoptosis of nerve cels in the infarct area and lessening the edema of brain tissue in rats with cerebral infarction.
