Journal of Jilin University(Medicine Edition) ›› 2020, Vol. 46 ›› Issue (04): 759-764.doi: 10.13481/j.1671-587x.20200415

• Research in basic medicine • Previous Articles    

Expression of insulin-like growth factor binding protein-3 in ischemic brain tissue of cerebral infarction model rats and its relationship with angiogenesis

BU Yi, ZHANG Shuo, QIAN Xudong, WANG Hongmei, DOU Zhijie   

  1. Department of Neurology, Affiliated Hospital, Chengde Medical College, Chengde 067000, China
  • Received:2019-08-30 Published:2020-08-20

Abstract: Objective: To investigate the expression level of insulin-like growth factor binding protein-3(IGFBP-3) in ischemic brain tissue of the rats with cerebral infarction and its relationship with angiogenesis,and to elucidate the role of IGFBP-3 in angiogenesis of cerebral infarction. Methods: The SD rats were randomly divided into control group and model group,and the rats in model group were divided into three subgroups of model 1 d group, model 3 d group and model 7 d group, with 30 rats in each group.The rat model of middle cerebral artery occlusion ischemia was established by suture method.Neurobehavioral score method was used to assess the neural behavior of the rats.Cerebral infarctions were observed by 2,3,5-triphenyltetrazolium chloride (TTC) staining.The pathomorphology of brain tissue of the rats was observed by HE staining.Immunohistochemical staining was used to measure the expression levels of IGFBP-3 and vascular endothelial growth factor (VEGF) proteins in brain tissue of the rats.Reverse transcription-polymerase chain reaction (RT-PCR) was used to measure the expression levels of IGFBP-3 and VEGF mRNA in brain tissue of the rats.Immunofluorescence staining was used to measure the microvessel density in the ischemic penumbra of the brain tissue of the rats. Results: There were no neurological deficits and cerebral infarction of the rats in control group.In model group,the neurobehavioral score of the rats was (1.86±0.73) scores and the volume of cerebral infarction was (28.34±3.57)%.The HE staining results showed that the brain tissue of the rats in control group was normal;in model 1 d group,edema occurred in the brain tissue of the rats; in model 3 d group,edema and necrosis of brain tissue of the rats were obvious; in model 7 d group, edema and necrosis of brain tissue were alleviated.Compared with control group, the expression levels of IGFBP-3 and VEGF proteins and mRNA in brain tissue of the rats in various model groups and the microvessel densities in ischemic penumbra were increased (P<0.01);the above indexes in brain tissue of the rats in model 3 d group were the highest;the expression levels of IGFBP-3 and VEGF proteins and mRNA in brain tissue of the rats in model 7 d group and the microvessel density in ischemic penumbra were decreased.There were positive correlation between the expression levels of IGFBP-3 mRNA and the VEGF mRNA and microvessel density in brain tissue of the rats (r=0.563,P<0.05;r=0.612,P<0.05). Conclusion: The expression level of IGFBP-3 in ischemic brain tissue of the rats with cerebral infarction is increased, which may promote angiogenesis after cerebral infarction.

Key words: cerebral infarction, insulin-like growth factor binding protein-3, vascular endothelial growth factor, angiogenesis

CLC Number: 

  • R743.3