三叉神经根慢性压迫损伤对三叉神经节细胞髓鞘碱性蛋白及P75表达的影响

Effect of chronic compression injury of trigeminal nerve root on expression of myelin basic protein and P75 in trigeminal ganglion cells

目的 探讨三叉神经节中卫星胶质细胞与神经元相互作用对三叉神经痛(TN)的影响。方法 在SD大鼠假手术组(n=24)和三叉神经根慢性压迫诱导的TN大鼠模型组(n=24)中,运用免疫荧光和Western blotting方法,研究髓鞘碱性蛋白(MBP)、胶质纤维酸性蛋白(GFAP)及P75神经营养因子受体(P75NTR)在三叉神经节中的表达情况。结果 TN模型组P75NTR表达较假手术组增高,术后第7天和第14天的表达增高有统计学意义(P<0. 01);MBP在TN模型组的表达较假手术组均降低,特别在第7和14天的表达降低有统计学意义(P<0. 05);卫星胶质细胞标志物GFAP在TN模型组术后第7、14和21天表达增高(P<0. 01)。结论 大鼠三叉神经根区慢性压迫损伤引起三叉神经节神经元MBP和P75NTR表达改变和卫星胶质细胞的活化,可能影响神经元-卫星胶质细胞的相互作用,参与TN大鼠口面部周围伤害性信息向中枢的传递。

Objective To investigate the effect of the interaction between satellite glial cells and neurons in the trigeminal ganglion of trigeminal neuralgia( TN) rat model. Methods In the TN rat model( n = 24) induced by trigeminal root entry zone chronic compression and sham group( n = 24),immunofluorescence and Western blotting were used to detect the expression of myelin basic protein( MBP),glial fibrillary acidic protein( GFAP) and of P75 neurotrophic factor receptor( P75 NTR) in the trigeminal ganglion. Results The expression of P75 NTRin TN group was higher than that in the sham operation group,especially on the post-operation day( POD) 7 and 14( P<0. 01). The expression of MBP in the TN group was decreased after operation,which were significant lower than that in the sham operation group on POD 7 and 14( P<0. 05). While the expression of immunoreactive GFAP in the satellite glial cells in the TN group was higher than that in the sham operation group from POD 7 to POD 21 after operation( P<0. 01). Conclusion The changes of MBP and P75 NTR expression in neurons and the activation of satellite glial cells in trigeminal ganglion of the TN animal model may affect the interaction of neuron-satellite glial cells,which may be involved in the nociceptive information transmission from orofacial area to the central nervous system in the TN rats.