OMgp及其受體NgR在中樞神經(jīng)系統(tǒng)發(fā)育中和損傷后表達(dá)及其意義的實(shí)驗(yàn)研究
[Abstract]:Under the influence of many factors, it is difficult to regenerate after (Central nervous system,CNS injury, such as the inhibitory effect of myelin inhibitor protein, the deficiency of neurotrophic factor, the formation of glial scar. And the subsequent inhibition of regeneration of the main proteoglycan upregulation and so on. However, during the period from injury to glial scar formation, regeneration is still affected by myelin inhibitor protein to a large extent. Some studies have shown that mice can regenerate after immunization with myelin sheath before spinal cord injury. At present, three myelin inhibitory proteins have been identified: myelin associated glycoprotein (myelin-associated glycoprotein,MAG) and recently discovered oligodendrocyte myelin glycoprotein (oligodendrocyte-myelin glycoprotein,OMgp). These three suppressor proteins are located on the surface of myelin sheath and adjacent to axons. The inhibitory effect of OMgp on axon-glial interaction is at the best position of mediating axon-glial interaction. The expression of OMgp mRNA and protein in postnatal CNS development of rodents has been reported, but the expression of OMgp in embryonic development has not been studied. The expression of OMgp in CNS of adult animals may be different from that in embryonic stage. Extending the study of the expression of OMgp from postnatal to embryonic stage will be of great help in understanding fully the function of OMgp. OMgp is also expressed in neurons, the function of which is not known. The study and comparison of the expression of OMgp in neurons and glial cells after CNS injury will lay a foundation for further study of its function, but it has not been reported yet. In addition, although there is no obvious sequence similarity between OMgp and Nogo,MAG, both of them exert their inhibitory effects through a common receptor, NgR. NgR has attracted much attention because of its pivotal role in regenerative inhibitory signal transduction. In recent years, it has been found that the myelin inhibitory protein receptor is expressed not only in neurons, but also in non-neuronal cell types such as oligodendrocytes. However, whether the NgR expressed by oligodendrocytes is associated with CNS damage and regeneration has not been demonstrated. In this paper, RT-PCR, immunohistochemical method was used to combine ligand OMgp with receptor NgR from two different levels of mRNA and protein, and to observe the whole process of rat from embryonic stage through adult to old age. To study the expression of OMgp and its receptor NgR in the development of CNS, to understand the relationship between OMgp,NgR and CNS development, and to study the expression of OMgp,NgR in neurons and oligodendrocytes after spinal cord transection in rats by establishing a rat spinal cord transection model. To investigate the expression and significance of OMgp,NgR in neurons and oligodendrocytes after CNS injury.
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2005
【分類號(hào)】:R363
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