去铁胺对新生大鼠缺氧缺血性脑的保护作用

目的： 研究去铁胺对新生大鼠缺氧缺血性脑病(HIE)模型新生血管形成的影响。方法：新生7 d SD大鼠建立HIE模型，模型组和治疗组建模前24 h分别用去铁胺或生理盐水注射。第1 d、3 d、7 d和14 d处死大鼠，检测缺氧缺血（左）侧脑组织毛细血管密度(BCDI)、增生毛细血管数、脑含水量、脑萎缩程度及其血管内皮生长因子(VEGF)和低氧诱导因子-1α (HIF-1α) mRNA表达。结果：治疗组左脑含水量和左脑萎缩比显著低于模型组(P<0.01)；左侧脑组织增生毛细血管数目显著高于模型组［(2.01±0.31)条/HPF vs (0.90±0.25)条/HPF ,P<0.01］。去铁胺显著上调左侧脑组织VEGF 和HIF-1α mRNA表达［12 h时VEGF：(1.41±0.07) vs (1.10±0.15)，P<0.05；HIF-1α：(1.49±0.12) vs (1.11±0.16)，P<0.05］。结论:去铁胺可能通过上调脑组织HIF-1α和VEGF表达，促进缺氧缺血脑组织新生血管形成，减轻缺氧缺血性脑损伤。

Protective effect of deferoxamine on hypoxic-ischemic encephalopathy in neonatal rat

AIM:To investigate the possible mechanism of deferoxamine on angiogenesis in rat hypoxic-ischemic encephalopathy (HIE). METHODS:SD rats (7 days of age) were used to make HIE model. Model group and treatment group were injected with deferoxamine or normal saline alone 24 hours before hypoxic-ischemic insult. Rats were sacrificed at 1,3,7 or 14 days after hypoxic-ischemic insult. Brain capillary density index (BCDI),the number of proliferating capillary,brain water content and extent of brain atrophy were determined. The expression of vascular endothelial growth factor (VEGF) and hypoxia-inducible factor-1α(HIF-1α) mRNA was measured. RESULTS:Early water content and late atrophic ratio of the left brain were significantly improved in the treatment group compared to model group (P<0.01). The number of proliferating capillary in the treatment group was significantly higher than that in the model group ［(2.01±0.31)/HPF vs　(0.90±0.25)/HPF,P<0.01］. Deferoxamine markedly up-regulated the expression of VEGF and HIF-1α mRNA in the brain ［VEGF at 12 h: (1.41±0.07) vs (1.10±.15),P<0.05; HIF-1α at 12 h: (1.49±0.12) vs (1.11±0.16),P<0.05］.CONCLUSION:Deferoxamine may promote angiogenesis and attenuate hypoxic-ischemic induced brain injury via up-regulation of HIF-1α and VEGF expression.