西格列汀对糖尿病肾病大鼠肾脏JNK信号通路的影响

目的探讨西格列汀对糖尿病肾病大鼠肾脏c-Jun氨基末端激酶(JNK)信号通路的影响。方法40只清洁级健康雄性Wistar大鼠,按随机数字表法分为正常对照组(NC组)10只、糖尿病组(DM组)10只、西格列汀干预组1(ST1组,5 mg)10只、西格列汀干预组2(ST2组,10 mg)10只。实验周期16周。检测24 h尿微量白蛋白、尿素氮(BUN)、血肌酐(Scr),计算肌酐清除率(Ccr)。肾组织石蜡切片,苏木精-伊红(HE)染色观察肾组织病理形态学改变;免疫组织化学和实时聚合酶链反应(PCR)检测Nephrin及JNK相关蛋白c-Jun在肾脏的蛋白和基因表达。结果与DM组相比,ST1组与ST2组24 h尿微量白蛋白、血BUN、Scr均显著降低,肾组织病理损伤减轻,差异有统计学意义(P<0.05);与ST1组相比,ST2组上述指标变化更为明显。与DM组相比,ST1与ST2组Nephrin蛋白及基因表达增加,c-Jun蛋白及基因表达降低(P<0.05);ST2组较ST1组变化更为明显。结论西格列汀可能通过抑制糖尿病肾病大鼠肾脏JNK信号通路的活性,上调足细胞Nephrin的表达,产生有效的肾保护作用。     

基于MAPK/ERK/JNK信号通路探究染料木黄酮对荨麻疹大鼠的保护作用

目的 从丝裂原活化蛋白激酶(MAPK)/胞外信号调节激酶1/2(ERK1/2)/c-Jun氨基末端激酶1/2(JNK1/2)通路探究染料木黄酮对荨麻疹大鼠的保护机制.方法 SD大鼠随机分为对照组、模型组、染料木黄酮低、高剂量(150、300 mg/kg)组,MAPK激活剂(茴香霉素)组、染料木黄酮+茴香霉素组,每组12...     

栀子苷通过抑制VPO1/ERK1/2信号通路减轻糖尿病心肌病大鼠的心肌细胞凋亡

目的:探讨栀子苷(geniposide,GE)改善大鼠糖尿病心肌病的作用及其具体机制。方法:24只成年雄性SD大鼠,随机分为3组:正常组(Control组,8只)、糖尿病心肌病组(DCM组,8只)、糖尿病心肌病组+栀子苷组(DCM+GE组,8只),采用高脂饲料联合链脲佐菌素(STZ)构建糖尿病心肌病大鼠模型,应用次氯酸(HOCl)诱导H9C2损伤模型。干预12周后,HE和Masson染色观察心脏组织病理学改变;TUNEL法检测大鼠心肌细胞凋亡水平;免疫组化检测及Western blot检测法检测VPO1/ERK1/2信号通路及凋亡相关蛋白表达水平。给予次氯酸刺激心肌细胞后,Western blot检测法检测ERK1/2、p-ERK1/2、Bcl-2、Bax蛋白表达水平的改变。给予ERK1/2酶抑制剂U0126后,用Western blot检测法再次检测ERK1/2、p-ERK1/2、Bcl-2、Bax蛋白表达水平的改变。结果:HE及Masson染色显示,与Control组相比,DCM组出现心肌纤维排列紊乱、心肌胶原含量明显增多,而DCM+GE组心肌损伤情况明显改善(P<0.05)。与Control组相比,DCM组心肌细胞凋亡水平及Bax/Bcl-2比值明显增加,而DCM+GE组心肌凋亡情况得到明显好转(P<0.05)。免疫组化和Western blot结果显示,在DCM组中VPO1、p-ERK1/2蛋白表达水平升高,而DCM+GE组中VPO1、p-ERK1/2蛋白表达水平得到了抑制(P<0.05)。进一步对H9C2细胞行HOCl干预发现,与Control组相比,次氯酸组出现p-ERK1/2蛋白表达水平及Bax/Bcl-2比值增加,而加入ERK1/2酶抑制剂U0126后p-ERK1/2蛋白表达水平及Bax/Bcl-2比值下降(P<0.05)。结论:栀子苷通过抑制VPO1/ERK1/2信号通路抑制心肌细胞凋亡从而改善糖尿病引起的心肌损伤。     

JNK信号通路介导化学性缺氧对PC12细胞的损伤作用

目的探讨C-Jun蛋白氨基末端激酶(C-Jun N-termi-nal kinase,JNK)通路在化学性缺氧模拟剂氯化钴(CoCl2)对PC12细胞损伤中的作用。方法应用化学性低氧模拟剂氯化钴(CoCl2)处理PC12细胞以建立化学性缺氧损伤模型。应用CCK-8比色法检测细胞存活率;Hoechst33258核染色法观察细胞凋亡的形态学改变;JC-1染色荧光显微镜照像检测线粒体膜电位(MMP);Western blot法检测JNK蛋白的表达水平。结果 600μmol.L-1CoCl2作用PC12细胞不同时间(12～48 h)后,可时间依赖性地抑制PC12细胞的存活率;600μmol.L-1的CoCl2处理PC12细胞48 h时,可引起细胞出现核固缩等典型的凋亡特征;CoCl2能明显的降低PC12细胞的MMP;CoCl2能诱导JNK的磷酸化,特异性的JNK阻断剂SP600125可抑制CoCl2对PC12细胞的上述损伤作用。结论 CoCl2可引起PC12细胞损伤,此作用可能与其诱导JNK磷酸化有关。     

CyclinD1和Bcl-2水平在B细胞淋巴瘤中的诊断价值

目的:探讨流式细胞术检测细胞周期蛋白D1(CyclinD1)和B淋巴细胞瘤-2基因(Bcl-2)水平在B细胞淋巴瘤中的诊断价值.方法:选取某院收治的B细胞淋巴瘤患者80例为试验组,另选取同期健康体检的健康者80例为对照组.采用流式细胞术测定入选者CyclinD1、Bcl-2水平,比较2组患者不同恶性程度B细胞淋巴瘤Cy...     

毛兰素通过 JNK/c-Jun信号通路对 2型糖尿病大鼠肝脏损伤的保护作用机制研究

目的基于 c-Jun氨基末端激酶( JNK)/c-Jun信号通路对氧化应激反应的调控作用,研究毛兰素对 2型糖尿病大鼠肝脏损伤的保护作用。方法于 2021年 10月至 2022年 2月腹腔注射链脲佐菌素构建糖尿病大鼠模型,将造模成功大鼠分为模型组、毛兰素低剂量组( 10 mg/kg)、毛兰素高剂量组( 40 mg/kg)及罗格列酮组( 1.25 mg/kg)、毛兰素( 40 mg/kg)+JNK激活组(5 mg/ kg),每组 10只,另取正常饲养大鼠 10只作为对照组。连续给药,6周后,通过血糖仪和胰岛素放射免疫分析试剂盒检测空腹血糖( FBG)、空腹胰岛素( FINS)水平,计算胰岛素抵抗指数( HOMA-IR)及胰岛素敏感指数( ISI);天平称取大鼠体质量和肝质量,计算肝脏指数;试剂盒检测丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶( AST)、总超氧化物歧化酶( T-SOD)、谷胱甘肽过氧化物酶( GSH-Px)活性及丙二醛(MDA)含量; HE染色观察肝脏组织病理学变化; western blotting法检测肝脏组织中 JNK/c-Jun信号通路相关蛋白表达。结果与对照组相比,模型组肝脏指数［( 4.26±0.12)g/100 g比( 2.24±0.09)g/100 g］、 FBG［( 21.49±1.78)mmol/L比( 5.14±0.45)mmol/L］、 FINS［( 80.17±6.38)mmol/L比( 22.35±2.04)mmol/L］、 HOMA-IR［( 76.46±6.56)比( 5.11±1.12)］、 ALT［( 138.71±10.21)U/L比( 70.29±5.54)U/L］和 AST活性［( 77.21±5.08)U/L比( 40.38±3.27)U/L］、 MDA含量［( 13.45±1.34)nmol/mg prot比( 3.72±0.87)nmol/mg prot］、 JNK/c-Jun信号通路相关蛋白表达均明显升高( P<0.05),体质量、 ISI［( ?7.45±0.18)比( ?4.74±0.11)］、 SOD［( 100.79±11.22)U/mg prot比( 223.46±19.86)U/mg prot］和 GSH-Px活性［( 24.42±1.74)U/mg prot比(56.79±3.18)U/mg prot］明显降低( P<0.05),且肝脏组织病理损伤较为严重;与模型组相比,毛兰素低剂量组、毛兰素高剂量组和罗格列酮组肝脏指数、 FBG、FINS、HOMA-IR、ALT和 AST活性、 MDA含量、 JNK/c-Jun信号通路相关蛋白表达均明显降低( P<0.05),体质量、 ISI、SOD和 GSH-Px活性明显升高( P<0.05)减轻肝脏损伤程度;与毛兰素高剂量组相比,毛兰素低剂量组、毛兰素+JNK激活组肝脏指数、 FBG、FINS、HOMA-IR、ALT和 AST活性、 MDA含量、 JNK/c-Jun信号通路相关蛋白表达均明显升高(P<0.05)体质量、 ISI、SOD和 GSH-Px活性明显降低( P<0.05),肝脏损伤恢复缓慢。结论毛兰素可通过调控 JNK/c-Jun信号通路,抑制,JNK/c-Jun通路蛋白表达,从而缓解氧化应激反应,改善糖尿病大鼠肝脏损伤。     

白皮杉醇对糖尿病肾病大鼠ERK1/2通路及CTGF蛋白表达的影响

目的:探究白皮杉醇(PIC)对糖尿病肾病(DN)大鼠细胞外调节蛋白激酶(ERK1/2)通路及其调控的结缔组织生长因子(CTGF)蛋白表达的影响.方法:取健康雄性SD大鼠,采用高脂高糖喂养+腹腔注射链脲霉素建立大鼠DN模型,并将造模成功的50只SD大鼠随机分为模型组(DN组)、PIC低(50mg·kg-1)、中(100m...     

牡荆素调控Sirt1/FoxO1通路介导的铁死亡对变应性鼻炎大鼠鼻黏膜损伤的保护作用

目的 探究牡荆素对变应性鼻炎大鼠鼻黏膜损伤的保护作用及其调控机制。方法 将SD大鼠随机分为对照组、模型组、牡荆素（3、6、12 mg/kg），及牡荆素（12 mg/kg）＋EX527（5 mg/kg）组，每组各10只。除对照组外，其余各组大鼠均采用卵清白蛋白诱导建立变应性鼻炎大鼠模型，模型构建成功后，各组大鼠ip相应剂量药物，对照组和模型组大鼠ip等量的生理盐水，1次/d，连续14 d。末次给药结束后30 min，记录各组大鼠行为学评分，观察鼻黏膜组织病理形态学变化；检测鼻黏膜组织超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH）、丙二醛（MDA）、活性氧气簇（ROS）、铁离子（Fe²⁺）水平，铁死亡相关蛋白溶质载体家族7成员11（SLC7A11）、谷胱甘肽过氧化物酶4（GPX4）、酰基辅酶A合成酶长链家族成员4（ACSL4）以及沉默信息调节因子1（Sirt1）、叉头框蛋白O1（FoxO1）、p-FoxO1、Ac-FoxO1蛋白表达。结果 与模型组相比，牡荆素各剂量组大鼠行为学评分均显著降低，鼻黏膜损伤显著改善（P＜0.05）；大鼠鼻黏膜组织匀浆SOD、GSH活性显著升高，MDA、ROS、Fe²⁺含量均显著降低（P＜0.05）；大鼠鼻黏膜组织SLC7A11、GPX4、Sirt1、FoxO1蛋白表达显著升高，p-FoxO1、Ac-FoxO1、ACSL4蛋白表达显著降低（P＜0.05），且呈剂量相关性。结论 牡荆素能够改善变应性鼻炎大鼠鼻黏膜损伤，其机制与激活鼻黏膜组织Sirt1/FoxO1通路，抑制细胞铁死亡有关。     

ERK1/2及JNK通路在AcSDKP抑制PDGF诱导的大鼠心脏成纤维细胞增殖和胶原蛋白表达中的作用

目的探讨细胞外信号调节激酶1/2(ERK1/2)及C-Jun氨基末端激酶(JNK)通路在N-乙酰基-丝氨酰-天门冬酰-赖氨酰-脯氨酸(AcSDKP)抑制血小板源性生长因子(PDGF)诱导的大鼠心脏成纤维细胞增殖和胶原蛋白表达中的作用。方法将新生Wistar大鼠心脏成纤维细胞分为对照组(A组)、10ng/ml PDGF刺激组(B组)、10-9 mol/L AcSDKP+10ng/ml PDGF干预组(C组)、25μmol/L PD98059+10ng/ml PDGF干预组(D组)和10nmol/L SP600125+10ng/ml PDGF干预组(E组)。MTT法检测心脏成纤维细胞代谢活性的变化,Western blot法检测大鼠心脏成纤维细胞中ERK1/2、JNK及磷酸化-ERK1/2、磷酸化-JNK蛋白表达和Ⅰ型、Ⅲ型胶原蛋白的表达。结果与A组相比,B组心脏成纤维细胞代谢活性、Ⅰ型及Ⅲ型胶原蛋白表达、磷酸化-ERK1/2及磷酸化-JNK蛋白表达均增强(P<0.05);而C、D、E组能明显逆转B组上述各观察指标的增加过程(P<0.05)。结论 AcSDKP能够通过阻断PDGF介导的ERK1/2及JNK通路的激活,进而抑制大鼠心脏成纤维细胞增殖和胶原蛋白表达。     

甜菜碱对糖尿病足大鼠创面愈合及AMPK/SIRT1/FoxO1通路的影响

目的 探讨甜菜碱对糖尿病足大鼠创面愈合及AMPK/SIRT1/FoxO1通路的影响。方法 SD大鼠随机分为对照组、模型组、二甲双胍（200 mg·kg^-1，ig给药）组和甜菜碱低、高剂量（50、100 mg ·kg^-1，ip给药）组，每组18只。除对照组外，其余组大鼠均构建糖尿病足模型。检测大鼠空腹血糖水平和创面愈合率；ELISA法检测大鼠血清炎性因子白细胞介素-6（IL-6）、肿瘤坏死因子-α（TNF-α）、C反应蛋白（CRP）水平；HE染色检测大鼠创面皮肤组织病理学改变；免疫组化染色检测大鼠创面皮肤组织中CD31蛋白阳性表达；试剂盒法检测大鼠创面皮肤组织中氧化应激指标超氧化物歧化酶（SOD）活性、丙二醛（MDA）含量；Western blotting检测大鼠创面皮肤组织中AMP依赖的蛋白激酶（AMPK）/沉默信息调节因子相关酶1（SIRT1）/叉头框蛋白1（FoxO1）通路相关蛋白表达。结果 给药结束后，与对照组比较，模型组大鼠空腹血糖、血清IL-6、TNF-α、CRP水平以及创面皮肤组织中MDA含量和p-FoxO1/FoxO1值显著升高，创面愈合率和创面皮肤组织中CD31阳性表达率、SOD活性、p-AMPK/AMPK值和SIRT1蛋白表达水平显著降低（P<0.05），且创面皮肤组织病理学损伤严重；与模型组比较，甜菜碱低、高剂量组和二甲双胍组大鼠空腹血糖、血清IL-6、TNF-α、CRP水平以及创面皮肤组织中MDA含量和p-FoxO1/FoxO1值显著降低，创面愈合率和创面皮肤组织中CD31阳性表达率、SOD活性、p-AMPK/AMPK值和SIRT1蛋白表达水平显著升高（P<0.05），且创面皮肤组织病理学损伤均有不同程度改善，且甜菜碱高剂量组和二甲双胍组上述指标变化更为明显。结论 甜菜碱可激活AMPK/SIRT1/FoxO1通路，减轻糖尿病足大鼠氧化应激和炎症反应，促进血管生成，加速创面愈合。     

Glabridin induces apoptosis and cell cycle arrest in oral cancer cells through the JNK1/2 signaling pathway

Glabridin, a flavonoid extracted from licorice (Glycyrrhiza glabra), possesses various biological properties, including anticancer activities. However, the effect of glabridin on oral cancer cell apoptosis and the underlying molecular mechanisms has not been elucidated. In this study, we demonstrated that glabridin treatment significantly inhibits cell proliferation in human oral cancer SCC‐9 and SAS cell lines. Flow cytometric assays demonstrated that glabridin induced several features of apoptosis, such as sub‐G1 phase cell increase and phosphatidylserine externalization. Furthermore, glabridin induced apoptosis dose‐dependently in SCC‐9 cells through caspase‐3, −8, and −9 activation and poly (ADP‐ribose) polymerase cleavage. Moreover, glabridin increased the phosphorylation of the extracellular signal–regulated kinase, p38, and c‐Jun N‐terminal kinase (JNK) pathways in a dose‐dependent manner. Moreover, the inhibition of the JNK1/2 inhibitor significantly reversed the glabridin‐induced activation of the caspase pathway. In conclusion, our findings suggest that glabridin induces oral cancer cell apoptosis through the JNK1/2 pathway and is a potential therapeutic agent for oral cancer.     

Wogonin protects glomerular podocytes by targeting Bcl-2-mediated autophagy and apoptosis in diabetic kidney disease

Diabetic kidney disease (DKD) is one of the microvascular complications of diabetes mellitus and a major cause of end-stage renal disease with limited treatment options. Wogonin is a flavonoid derived from the root of Scutellaria baicalensis Georgi, which has shown a potent renoprotective effect. But the mechanisms of action in DKD are not fully elucidated. In this study, we investigated the effects of wogonin on glomerular podocytes in DKD using mouse podocyte clone 5 (MPC5) cells and diabetic mice model. MPC5 cells were treated with high glucose (30 mM). We showed that wogonin (4, 8, 16 μM) dose-dependently alleviated high glucose (HG)-induced MPC5 cell damage, accompanied by increased expression of WT-1, nephrin, and podocin proteins, and decreased expression of TNF-α, MCP-1, IL-1β as well as phosphorylated p65. Furthermore, wogonin treatment significantly inhibited HG-induced apoptosis in MPC5 cells. Wogonin reversed HG-suppressed autophagy in MPC5 cells, evidenced by increased ATG7, LC3-II, and Beclin-1 protein, and decreased p62 protein. We demonstrated that wogonin directly bound to Bcl-2 in MPC5 cells. In HG-treated MPC5 cells, knockdown of Bcl-2 abolished the beneficial effects of wogonin, whereas overexpression of Bcl-2 mimicked the protective effects of wogonin. Interestingly, we found that the expression of Bcl-2 was significantly decreased in biopsy renal tissue of diabetic nephropathy patients. In vivo experiments were conducted in STZ-induced diabetic mice, which were administered wogonin (10, 20, 40 mg · kg⁻¹ · d⁻¹, i.g.) every other day for 12 weeks. We showed that wogonin administration significantly alleviated albuminuria, histopathological lesions, and p65 NF-κB-mediated renal inflammatory response. Wogonin administration dose-dependently inhibited podocyte apoptosis and promoted podocyte autophagy in STZ-induced diabetic mice. This study for the first time demonstrates a novel action of wogonin in mitigating glomerulopathy and podocytes injury by regulating Bcl-2-mediated crosstalk between autophagy and apoptosis. Wogonin may be a potential therapeutic drug against DKD.     

氯沙坦对心肌成纤维细胞基质金属蛋白酶-2、JNK1/2表达及增殖活性的影响

目的：研究氯沙坦通过影响高血压大鼠心肌成纤维细胞间质成分抑制心室重构的药理机制。方法：培养心肌成纤维细胞，免疫细胞化学法鉴定细胞，MTT法测氯沙坦和AngⅡ对细胞增殖活性影响的量效关系，Western Blotting测AngⅡ刺激成纤维细胞心肌JNK1／2、磷酸化JNK1／2表达的时效关系。根据实验所得AngⅡ刺激心肌成纤维细胞增殖活性作用的EC劬值、氯沙坦抑制心肌成纤维细胞活性作用的IC50值和AngⅡ刺激JNK1／2表达的最佳时间，心肌成纤维细胞分为无血清DMEM组、AngⅡ100nmol／L组、AngⅡ100nmol／L＋losartan　100nmol／L组、losartan 100nmol／L组，药物干预后分别收集各组蛋白质、培养上清液，Western blotting检测各组MMP-2、JNK1／2、磷酸化JNK1／2蛋白表达，ELISA检测分泌至培养上清液中MMP-2的量。结果：AngⅡ刺激心肌成纤维细胞增殖活性作用的EC50为53nmol／L，氯沙坦抑制心肌成纤维细胞增殖活性作用的EC50为56．3nmol／L。JNK1／2蛋白表达在AngⅡ刺激2min达高峰，随后表达逐渐降低。AngⅡ增加JNK1／2表达，氯沙坦降低AngⅡ刺激导致的JNK1／2表达。AngⅡ组MMP-2蛋白表达较无血清DMEM组明显增高，氯沙坦降低AngⅡ刺激增高的MMP-2表达。AngⅡ组MMP-2分泌较无血清DMEM组增高，氯沙坦减少AngⅡ刺激所致MMP-2分泌增高。结论：氯沙坦防治高血压引起的心室重构，可能与其对抗AngⅡ刺激心肌成纤维细胞增殖活性、MMP-2合成、分泌有关，信号通路涉及JNK1／2。     

Structure-based design,synthesis, and evaluation of Bcl-2/Mcl-1 dual inhibitors

Based on our previously reported Bcl-2/Mcl-1 dual inhibitor 4-thiomorpholinyl-2-cyano-3-amidinophenalenone ( A1 ) that simultaneously occupies the p2 and p4 hydrophobic pockets of Bcl-2 and Mcl-1, we optimized molecules with different bond angles of the groups extending to the p4 pocket and bulky hydrophobic groups to explore p2. Research on structure–activity relationship resulted in a new derivative B4 that is capable of occupying both the p2 and p4 more deeply and completely than A1 , with K_i values determined by fluorescence polarization assay (FPAs) improving to 0.31 μM for Bcl-2 and 0.16 μM for Mcl-1. Furthermore, B4 exhibited selective lethality on cancer cells over normal cells. It showed stronger apoptosis induction than (–)-gossypol on a Bcl-2/Mcl-1-dependent cancer cell line and killed an Mcl-1-dependent cell line which is resistant to ABT-199 treatment.     

Downregulation of Nrf2/HO-1 pathway and activation of JNK/c-Jun pathway are involved in homocysteic acid-induced cytotoxicity in HT-22 cells

Previous studies have suggested that elevated blood homocysteic acid (HCA) levels increased the risk of Alzheimer's disease (AD), but the underlying mechanisms are unclear. Herein, we studied the neuronal toxicity of HCA and the underlying mechanisms in HT-22 cells. Results showed that HCA induced cell death in concentration- and time-dependent manners, but did not activate Caspase-3. Additionally, HCA increased ROS production, depleted GSH, inactivated the Nrf2/HO-1 pathway, decreased mitochondrial membrane potential and increased the ratio of Bax/Bcl-2, two apoptosis-related proteins. Furthermore, HCA significantly increased the levels of p-JNK and p-c-Jun and its toxicity dramatically attenuated by SP600125, a specific JNK pathway inhibitor. Taken together, our results provide evidence that HCA induced cytotoxicity in HT-22 cells through down-regulating of Nrf2/HO-1 pathway and activating JNK/c-Jun pathway, supporting that HCA might be a therapeutic target for AD.     

硫化氢对抗化学性缺氧引起的心肌细胞损伤及其机制

目的观察H2S对氯化钴(CoCl2)诱导的H9C2心肌细胞缺氧性损伤的影响,探讨其作用机制。方法用CoCl2处理H9C2心肌细胞,建立化学性缺氧诱导心肌细胞损伤的实验模型。NaHS(H2S的供体)在CoCl2处理H9C2心肌细胞前30 min加入培养基中,作为预处理。应用CCK-8比色法检测细胞存活率;PI染色流式细胞仪检测细胞凋亡率;Western blot法检测Cleaved Caspase-3的表达;GSSG试剂盒检测GSSG/(GSSG+GSH)的比值;双氯荧光素(DCFH-DA)染色荧光显微镜照相检测细胞内的活性氧(ROS);罗丹明123(Rh123)染色荧光显微镜照相检测线粒体膜电位(MMP)。结果在400~800μmol.L-1浓度范围内,CoCl2处理H9C2心肌细胞36 h,呈剂量依赖性地降低细胞存活率。在600μmol.L-1CoCl2处理H9C2心肌细胞前30 min,应用400μmol.L-1NaHS可明显地抑制CoCl2对细胞的损伤作用,使细胞存活率明显升高,细胞凋亡率及CleavedCaspase-3表达降低;并使H9C2心肌细胞内GSSG/(GSH+GSSG)比值及ROS水平明显降低,同时明显地改善MMP。结论H2S能明显地对抗化学性缺氧诱导的心肌细胞损伤,此保护作用与其降低GSSG/(GSH+GSSG)比值和ROS水平,改善MMP,抑制Caspase-3活化等机制有关。     

Resveratrol protects against 4-hydroxynonenal-induced apoptosis by blocking JNK and c-JUN/AP-1 signaling.

In the present study we have studied the effect of resveratrol in signal transduction mechanisms leading to apoptosis in 3T3 fibroblasts when exposed to 4-hydroxynonenal (HNE). In order to gain insight into the mechanisms of apoptotic response by HNE, we followed MAP kinase and caspase activation pathways; HNE induced early activation of JNK and p38 proteins but downregulated the basal activity of ERK (1/2). We were also able to demonstrate HNE-induced release of cytochrome c from mitochondria, caspase-9, and caspase-3 activation. Resveratrol effectively prevented HNE-induced JNK and caspase activation, and hence apoptosis. Activation of AP-1 along with increased c-Jun and phospho-c-Jun levels could be inhibited by pretreatment of cells with resveratrol. Moreover, Nrf2 downregulation by HNE could also be blocked by resveratrol. Overexpression of dominant negative c-Jun and JNK1 in 3T3 fibroblasts prevented HNE-induced apoptosis, which indicates a role for JNK-c-Jun/AP-1 pathway. In light of the JNK-dependent induction of c-Jun/AP-1 activation and the protective role of resveratrol, these data may show a critical potential role for JNK in the cellular response against toxic products of lipid peroxidation. In this respect, resveratrol acting through MAP kinase pathways and specifically on JNK could have a role other than acting as an antioxidant-quenching reactive oxygen intermediate.