长春胺衍生物Vin24通过Bcl-2/Bax/Caspase3通路改善糖尿病小鼠周围神经病变研究  

Research on the Improvement of Peripheral Neuropathy in Diabetic Mice by Vincamine Derivative Vin24 via Bcl-2/Bax/Caspase3 Pathway

作　　者：黄玉洁 阮园[2] 王佳颖[1] HUANG Yujie;RUAN Yuan;WANG Jiaying(School of Medicine,Nanjing University of Chinese Medicine,Nanjing 210023,China;Affiliated Hospital of Nanjing University of Chinese Medicine,Nanjing 210029,China)

机构地区：[1]南京中医药大学医学院,江苏南京210023 [2]南京中医药大学附属医院,江苏南京210029

出　　处：《南京中医药大学学报》2024年第11期1189-1199,共11页Journal of Nanjing University of Traditional Chinese Medicine

基　　金：国家自然科学基金面上项目(82473982);江苏省高等学校自然科学基金重大项目(23KJA350002)。

摘　　要：目的探讨长春胺衍生物Vin24对糖尿病周围神经病变(DPN)小鼠病理症状的保护作用及其作用机制。方法40只8周龄雄性C57BL/6N小鼠随机分为对照组、模型组、长春胺给药组和Vin24给药组。除对照组外,其余3组小鼠腹腔注射链脲佐菌素(STZ,150 mg·kg^(-1))诱导1型糖尿病模型,6周后开始给药。30只18周龄雄性db/db小鼠随机分为模型组、长春胺给药组和Vin24给药组,10只同窝阴性小鼠作为对照组。给药组每天灌胃长春胺(30 mg·kg^(-1))或Vin24(46.8 mg·kg^(-1)),对照组和模型组每天灌胃等体积的生理盐水,持续4周。通过检测机械异位痛觉和热痛觉阈值来评价小鼠感觉功能。利用激光散斑成像仪检测小鼠外周血流量。取足垫表皮组织进行PGP9.5免疫荧光染色评价表皮内神经纤维(IENF)密度;提取原代背根底神经节(DRG)神经元进行β-tubulinⅢ免疫荧光染色评价DRG神经元突起生长情况。此外,取DRG组织进行ATF3免疫荧光染色以及Western blot检测Bcl-2、Bax、Cleaved-Caspase3和Caspase3的蛋白水平来评价DRG神经元凋亡水平。结果与模型组相比,Vin24给药组小鼠的机械异位痛和热痛觉阈值降低(P<0.01,P<0.001),外周血流量增加(P<0.001);IENF密度增加(P<0.05,P<0.01),DRG神经元突起生长得到改善(P<0.001)。荧光染色结果显示,Vin24给药后小鼠DRG组织中神经元凋亡标记物ATF3的表达减少(P<0.01,P<0.001)。Western blot结果显示,抗凋亡蛋白Bcl-2的蛋白水平显著增加(P<0.05),促凋亡蛋白Bax和Cleaved-Caspase3的蛋白水平显著降低(P<0.05)。结论长春胺衍生物Vin24通过调控Bcl-2/Bax/Caspase3通路,抑制Cleaved-Caspase3的激活,降低神经元的凋亡水平,从而减轻DRG神经元损伤,改善糖尿病小鼠周围神经病变。OBJECTIVE To investigate the protective effect and mechanism of vincamine derivative Vin24 on the pathological symptoms of diabetic peripheral neuropathy(DPN)in mice.METHODS Forty 8-week-old male C57BL/6N mice were randomly divided into control group(Control),model group(STZ),vincamine group(STZ+Vin)and Vin24 group(STZ+Vin24).Except the control group,the rest three groups of mice were intraperitoneally injected with streptozocin(STZ,150 mg·kg^(-1))to induce type 1 diabetes and administration was started six weeks later.Thirty 18-week-old male db/db mice were randomly divided into model group(db/db),vincamine group(db/db+Vin)and Vin24 group(db/db+Vin24).Ten age-matched wild-type mice were used as a control group(db/m).The vincamine group were gavaged 30 mg·kg^(-1)of vincamine daily.The Vin24 group was gavaged 46.8 mg·kg^(-1)of Vin24,while the control and model group were given the same amount of saline daily,for four weeks.Sensory functions of the mice were assessed by assays against tactile and thermal allodynia threshold.A Laser Speckle Imaging System was used to detect the peripheral blood flow.The epidermal tissues of foot pads were collected for PGP9.5 immunofluorescence to measure the intraepidermal nerve fiber(IENF)density.Primary dorsal root ganglia(DRG)neurons were isolated forβ-tubulinⅢimmunofluorescence to evaluate neurite outgrowth.Additionally,DRG tissues were extracted for ATF3 immunofluorescence for the evaluation of DRG neuronal apoptosis,and Western blot analysis was used to measure the protein levels of Bcl-2,Bax,Cleaved-Caspase3 and Caspase3.RESULTS The tactile and thermal allodynia thresholds were decreased(P<0.01,P<0.001),and peripheral blood flow was increased(P<0.001)in Vin24-treated DPN mice.The IENF density was increased(P<0.05,P<0.01)and DRG neurite outgrowth was improved(P<0.001)in Vin24 group compared with that in the model group.Immunofluorescence assay results indicated that the number of ATF3(a marker of neuronal apoptosis)-positive neurons was obviously decreased(P<0.01,P<0.00

关 键 词：糖尿病周围神经病变 背根底神经节 神经元凋亡 Bcl-2/Bax/Caspase3通路 长春胺衍生物 

分 类 号：R285.5[医药卫生—中药学]