穿心莲内酯调节cAMP/PKA/CREB信号通路对幼年癫痫大鼠神经炎症的影响  

Effect of andrographolide on neuroinflammation in young epileptic rats by regulating cAMP/PKA/CREB signaling pathway

作　　者：郭静芳[1] 吴磊 杨赫[1] 李爱民[1] GUO Jingfang;WU Lei;YANG He;LI Aimin(Department of Pediatrics,Jingzhou Central Hospital,Jingzhou 434020,China)

机构地区：[1]荆州市中心医院儿科,荆州434020

出　　处：《中国免疫学杂志》2025年第4期841-846,共6页Chinese Journal of Immunology

摘　　要：目的:探究穿心莲内酯(AG)调节环磷酸腺苷(cAMP)/蛋白激酶A(PKA)/cAMP反应元件结合蛋白(CREB)信号通路对幼年癫痫大鼠神经炎症的影响。方法:将幼年SPF级SD大鼠随机分为5组(12只/组):模型(Model)组,低、高剂量AG(AG-L、H)组(125、250 mg/kg),高剂量AG+PKA抑制剂H-89(AG-H+H-89)组(250 mg/kg AG+2 mg/kg H-89)和对照(Control)组,腹腔注射红藻氨酸(KA)建立幼龄大鼠癫痫模型。Morris水迷宫检测大鼠学习记忆能力。ELISA检测大鼠海马组织IL-10、TNF-α、丙二醛(MDA)、超氧化物歧化酶(SOD)、cAMP水平。Nissl染色检测海马组织形态学。TUNEL实验分析海马神经元凋亡率。RT-qPCR测定海马组织中PKA、CREB mRNA的表达。Western blot检测各组大鼠海马组织PKA、Bax、Caspase-3、CREB、p-CREB、脑源性神经营养因子(BDNF)蛋白表达。结果:相比Control组,Model组逃避潜伏期、神经细胞凋亡率、海马组织MDA、TNF-α水平、Bax、Caspase-3表达升高,目标象限停留时间、海马组织SOD、IL-10、cAMP水平、PKA、CREB mRNA和蛋白表达、BDNF蛋白表达显著下降(P<0.05),海马组织出现病理损伤,大量尼氏小体丢失。与Model组相比,AG-H组大鼠相应指标与上述相反(P<0.05),尼氏小体丢失减少。H-89减轻了AG对幼年癫痫大鼠神经炎症的改善作用。结论:AG可改善幼年癫痫大鼠的神经炎症,其机制可能与上调cAMP/PKA/CREB信号通路有关。Objective:To investigate effect of andrographolide(AG)on neuroinflammation in young epileptic rats by regulating cyclic adenosine monophosphate(cAMP)/protein kinase A(PKA)/cAMP response element binding protein(CREB)signaling pathway.Methods:SPF grade young SD rats were randomly divided into Control group,Model group,low-dose AG group(AG-L,125 mg/kg),high-dose AG group(AG-H,250 mg/kg)and high-dose AG+PKA inhibitor H-89 group(AG-H+H-89,250 mg/kg AG+2 mg/kg H-89),with 12 rats in each group.Epilepsy model of young rats was established by intraperitoneal injection of kainic acid(KA).Morris water maze test was used to detect learning and memory functions of rats.ELISA was used to detect levels of TNF-α,IL-10,malondialdehyde(MDA),superoxide dismutase(SOD)and cAMP in hippocampus of rats in each group.Histomorphology of hippocampus was detected by Nissl staining.TUNEL test was usd to determine apoptosis rate of neurons in rat hippocampus.PKA and CREB mRNA expressions in hippocampus of rats in each group were detected by RT-qPCR.Western blot was used to detect protein expressions of PKA,Bax,Caspase-3,CREB,p-CREB and brain derived neurotrophic factor(BDNF)in hippocampus of rats in each group.Results:Compared with control group,escape latency,TNF-αand MDA levels in hippocampus,apoptosis rate of nerve cells,Bax and Caspase-3 protein expressions in Model group were obviously increased(P<0.05),target quadrant residence time,SOD,IL-10,cAMP levels,PKA,CREB mRNA and protein expressions,BDNF protein expression in hippocampus were decreased obviously(P<0.05),hippocampal tissue showed pathological damage and a large number of Nissl bodies were lost.Compared with Model group,corresponding indexes of rats in AG-H group were contrary to the above(P<0.05),loss of Nissl corpuscles was reduced.H-89 alleviated improvement of AG on neuroinflammation in young epileptic rats.Conclusion:AG may reduce neuroinflammation in young epileptic rats by activating cAMP/PKA/CREB signaling pathway.

关 键 词：穿心莲内酯 环磷酸腺苷/蛋白激酶A/cAMP反应元件结合蛋白信号通路 癫痫 神经炎症 

分 类 号：R285.5[医药卫生—中药学]