內(nèi)皮祖細胞對創(chuàng)傷性血腦屏障通透性及血管新生的研究
[Abstract]:Background: traumatic brain injury is a kind of acquired brain injury, which can lead to blood-brain barrier damage, neuronal death and neurological dysfunction. Angiogenesis, as a key factor in the repair of traumatic brain injury, can provide an important vascular matrix for neural remodeling, which is beneficial to the long-term functional recovery after traumatic brain injury. Endothelial progenitor cells (endothelial progenitor cells, EPCs) are single lineage stem cells, which can mobilize peripheral blood from bone marrow (or other tissues, organs) when stimulated by trauma, inflammation, ischemia, etc. Homing to the site of the injury and differentiating into vascular endothelial cells, By integrating existing blood vessels (angiogenesis) or directly producing new vessels (angiogenesis) to play its role. The emergence of EPCs breaks the idea that angiogenesis occurs only in the embryonic stage. Previous animal experiments have proved that transplantation of EPCs can promote the functional recovery of limb ischemia, myocardial ischemia, cerebral infarction and other diseases. Our group reported for the first time that the number of circulating EPCs in patients with traumatic brain injury was positively correlated with the clinical prognosis. Progesterone stimulates the increase of EPCs and promotes the recovery of function after traumatic brain injury in mice. Objective: the purpose of this follow-up study was to confirm that endothelial colony-forming cells (ECFCs) in umbilical cord blood after craniocerebral trauma (TBI) can reduce the whole body distribution of cells induced by vein transplantation. At the same time, it can repair the blood-brain barrier, promote angiogenesis, which is conducive to the recovery of post-traumatic function, and provide a new strategy for clinical treatment. Methods: the mononuclear cells isolated from human umbilical cord blood were cultured and amplified into ECFCs. Adult nude mice were used to establish traumatic brain injury model by hydraulic attack. ECFCswere transplanted into lateral ventricle one day after injury. The rats were divided into three groups: ECFCs group, saline group and sham operation group. Cell dye SP-DiIC18 (3) and Y chromosome fluorescence in situ hybridization were used to track the transplanted cells. The permeability of blood-brain barrier and brain water content were measured by Yi Wen's blue osmotic method and dry wet weight method. The expression of tight junction protein ZO-1 claudin-5 and cytokine Ang-1 Ang2 was detected by Western blotting and real-time fluorescent quantitative PCR. Microvessel density was counted by VWF immunofluorescence staining. The modified neurological function score and Morris water maze were used to evaluate the functional results after traumatic brain injury. Results: cultured mononuclear cells isolated from human umbilical cord blood for 5-8 days could produce ECFCsand form colony ECFCs for 14 days to absorb acetylated low density lipoprotein and binding agglutinin. It also expressed stem cell marker CD34 and endothelial cell marker VWFFVE-cadherin. Three days after transplantation, SP-DiIC18 (3) and Y chromosome fluorescence in situ hybridization were used to detect that the Yi Wen blue leakage and brain water content were decreased and the expression of ZO-1 and claudin-5 were increased in the transplanted cells. The ratio of Angl:Ang2 and microvessel density were increased. At the same time, the improved neurological function score and Morris water maze also showed that ECFCs transplantation promoted the recovery of motor function, spatial acquisition and memory function after craniocerebral trauma in rats. Conclusion: this study demonstrated that ECFCs transplanted through the ventricular pathway can be homogenized to the traumatic area of the brain, which can repair the damaged blood-brain barrier. Enhanced angiogenesis to promote the recovery of neural function after traumatic brain injury .ECFCs transplantation in the future may be beneficial to the functional recovery of patients with traumatic brain injury.
【學位授予單位】:天津醫(yī)科大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R651.15
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