血管活性肠肽对自身免疫性脑脊髓炎大鼠CD4^+CD25^+Treg/CD4^+T细胞比例及TGF-β1表达的影响

目的探讨血管活性肠肽(VIP)对实验性自身免疫性脑脊髓炎(EAE)大鼠CD4^+CD25^+Treg/CD4^+T细胞比例及转化生长因子-β1(TGF-β1)表达的影响。方法健康雌性Wistar大鼠随机分成EAE模型对照组和VIP低剂量防治组、VIP高剂量防治组,利用髓鞘碱性蛋白(MBP)^+完全福氏佐剂(CFA)诱导建立EAE模型,另设正常对照组。自造模当日起,每隔1d分别对VIP低、高剂量防治组大鼠腹腔注射VIP 4nmol/kg(0.2mL)、16nmol/kg(0.8mL),正常对照组及EAE对照组腹腔注射0.8mL生理盐水,连续10d。观察各组大鼠发病高峰期神经功能障碍评分情况;HE...

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Published in西安交通大学学报(医学版) Vol. 38; no. 2; pp. 221 - 225
Main Author 杨元 陶涛 郭晓燕 袁正洲 吕志宇 李晓红 李作孝
Format Journal Article
LanguageChinese
Published 西南医科大学附属医院神经内科,四川泸州,646000 2017
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Summary:目的探讨血管活性肠肽(VIP)对实验性自身免疫性脑脊髓炎(EAE)大鼠CD4^+CD25^+Treg/CD4^+T细胞比例及转化生长因子-β1(TGF-β1)表达的影响。方法健康雌性Wistar大鼠随机分成EAE模型对照组和VIP低剂量防治组、VIP高剂量防治组,利用髓鞘碱性蛋白(MBP)^+完全福氏佐剂(CFA)诱导建立EAE模型,另设正常对照组。自造模当日起,每隔1d分别对VIP低、高剂量防治组大鼠腹腔注射VIP 4nmol/kg(0.2mL)、16nmol/kg(0.8mL),正常对照组及EAE对照组腹腔注射0.8mL生理盐水,连续10d。观察各组大鼠发病高峰期神经功能障碍评分情况;HE染色观察脑组织基本病理改变;免疫组化技术检测脑组织中星形胶质细胞活化情况;流式细胞术及ELISA法检测脾组织中CD4^+CD25^+Treg/CD4^+T细胞比例及脑组织匀浆中TGF-β1含量变化。结果 VIP各剂量防治组大鼠发病高峰期神经功能障碍评分(NDS)降低,脑组织中炎细胞浸润程度明显下降、活化的星形胶质细胞数量减少、脾组织中CD4^+CD25^+Treg/CD4^+T细胞比例升高、脑组织匀浆中TGF-β1含量升高,且各低、高剂量组间存在一定剂量依赖关系。结论 VIP通过提高脾组织中CD4^+CD25^+Treg/CD4^+T细胞比例、增加脑组织匀浆中TGF-β1含量,从而减轻脑组织炎症细胞的浸润程度,抑制星形胶质细胞活化,发挥对EAE的防治作用。
Bibliography:Objective To explore the effects of vasoactive intestinal peptide(VIP)on the ratio of CD4^+CD25^+Treg/CD4^+T cell and the expression of TGF-β1 in experimental autoimmune encephalomyelitis(EAE)rats.Methods We randomly divided 60 healthy female Wistar rats into normal control group,EAE control group,VIP low-dose group and VIP high-dose group.We used myelin basic protein(MBP)^+ complete adjuvant(CFA)to establish EAE model.Since the day of model construction,the low-and high-dose VIP groups received intraperitoneal injection of 4 nmol/kg(0.2 mL)and 16 nmol/kg(0.8 mL)of VIP every other day,respectively;normal control group and EAE group received injection of saline of 0.8 mL for 10 days in a row.We recorded the peak of neurological dysfunction score(NDS)changes in the rats,observed the pathological changes and GFAP^+astrocyte activation in the brain at the morbidity peak of rats with HE staining,and detected the ratio of CD4^+CD25^+Treg/CD4^+T in the spleen with FACS and TGF-β1 cytokine level in brain tissue with
ISSN:1671-8259
DOI:10.7652/jdyxb201702013