银杏叶提取物对COPD大鼠p38MAPK/NF-κB信号通路的影响

摘要 目的：观察银杏叶提取物（Ginkgo biloba extract, GBE）对慢性阻塞性肺疾病( COPD) 大鼠肺p38丝裂原活化蛋白激酶（MAPK）/ 核转录因子-κB（NF-κB）信号通路的影响,探讨GBE对COPD抗炎作用的分子机制。方法：将90只雄性Wistar 大鼠随机分为空白对照组、COPD 模型组、GBE高剂量组、GBE中剂量组、GBE低剂量组、SB203580(p38MAPK抑制剂)组,共计6组,每组15只。采用香烟烟雾熏吸联合气道内注入脂多糖（LPS）的方法建立COPD大鼠模型。造模结束后分组给药,空白对照组与COPD 模型组给予生理盐水腹腔注射,GBE高、中、低剂量组 (14, 7, 3.5 mg?kg^-1?d^-1)分别给予不同浓度的GBE腹腔注射,SB203580组予5 mg?kg^-1?d^-1腹腔注射,每天给药1次,连续给药14 d。通过HE染色法观察大鼠肺泡和气道的病理变化,酶联免疫吸附法（ELISA）测定大鼠肺泡灌洗液（BALF）和血清中IL-6、IL-8与IL-10水平,蛋白免疫印迹法(Western blot) 检测大鼠肺组织p38MAPK、NF-κB p65、NF-κB抑制蛋白α（IκBα）蛋白含量,采取实时荧光定量聚合酶链式反应(Real-time qPCR) 法检测大鼠肺组织中p38MAPK、NF-κB p65、IκBα mRNA表达。结果：与COPD模型组相比,各用药组均能抑制肺泡破坏与气道重塑,减轻肺泡与支气管周围炎症浸润;与空白对照组相比,COPD 模型组BALF与血清中IL-6、IL-8含量明显升高（P<0.05）,IL-10含量明显降低（P<0.05）,肺组织中p38MAPK、NF-κB p65蛋白与p38MAPK、NF-κB p65 mRNA表达量明显升高（P<0.05）,IκBα蛋白与IκBα mRNA表达量明显下降（P<0.05）;与COPD模型组相比,各药物组均能明显降低大鼠BALF与血清中IL-8含量、提高IL-10含量（P<0.05）,而GBE高剂量组与SB203580组效果更明显;GBE高剂量组与SB203580组BALF中IL-6含量较GBE低剂量组与COPD模型组明显降低（P<0.05）;与COPD模型组相比,各药物组均能明显降低大鼠肺组织中p38MAPK、NF-κB p65蛋白与p38MAPK、NF-κB p65 mRNA表达量（P<0.05）,GBE高、中剂量组与SB203580组能明显提高IκBα蛋白与IκBα mRNA表达量（P<0.05）。结论：GBE能抑制COPD大鼠炎症反应与气道重塑,其机制可能与调控p38MAPK/NF-κB信号通路有关。     

姜黄素对过度训练大鼠脾脏炎症反应的调控作用及其机制

目的: 研究姜黄素调控Toll-样受体4(TLR4)- p38丝裂原活化蛋白激酶(p38 MAPK)/核因子κB(NF-κB)信号通路缓解过度训练大鼠脾脏炎症反应的作用及其机制。方法: 7周龄SPF级雄性Wistar大鼠分为安静对照组(C组,n=12)、过度训练模型组(OM组,n=11)、姜黄素+模型组(COM组,n=14)。C组不进行任何运动干预,OM和COM组进行8周递增负荷游泳训练。训练期间,COM组以200 mg/(kg·d)、5 ml/kg姜黄素进行灌胃,其他组灌胃等体积0.5 %羧甲基纤维素纳助溶剂。末次训练后24 h,称重计算脾脏指数,光镜观察脾脏组织病理学改变,取血液、脾脏组织检测相关生化指标。结果: 8周递增负荷游泳训练后,光镜下C组大鼠脾脏组织结构正常;OM组较C组脾脏指数极显著降低(P＜0.01),并出现典型炎症病理变化;COM组较OM组脾脏指数显著升高(P＜0.05),且炎症病理变化有所改善。与C组比较,OM组血清皮质酮(Cor)、NF-κB、肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)水平和脾脏单核细胞表面TLR4表达率、TNF-α、IL-6水平均升高(P＜0.05或P＜0.01),脾脏p38 MAPK、磷酸化p38 MAPK(p-p38 MAPK)和NF-κB蛋白质表达水平均增强(P＜0.05或P＜0.01);血清睾酮(T)、血清和脾脏白细胞介素-10(IL-10)水平降低(P＜0.01)。与OM组比较,COM组血清Cor、NF-κB、TNF-α、IL-6水平和脾脏单核细胞表面TLR4表达率、TNF-α、IL-6水平均降低(P＜0.05或P＜0.01),脾脏p38 MAPK、p-p38 MAPK和NF-κB蛋白质表达水平均降低(P＜0.05);血清T、血清和脾脏IL-10水平升高(P＜0.05或P＜0.01)。组间T/Cor比值变化趋势与T变化相一致。结论: 8周递增负荷游泳训练引发大鼠过度训练,脾脏组织炎症反应加剧,出现炎症病理变化。训练期间补充姜黄素可以通过下调TLR4-p38 MAPK/NF-κB信号通路相关蛋白质表达,维护促炎/抑炎因子间动态平衡,保护脾脏。     

银杏黄酮对非酒精性脂肪肝模型小鼠的作用及NF-κB在其机制中的相关性分析

本文观察银杏黄酮对非酒精性脂肪性肝(NAFLD)模型小鼠的作用,并分析NF-κB与小鼠肝脏脂肪变性及血清丙氨酸氨基转移酶(ALT)的相关性。170只昆明小鼠随机分为正常对照组、模型组、银杏黄酮高[300mg/(kg·d)]、中[150 mg/(kg·d)]、低[75 mg/(kg·d)]剂量组。采用高脂饲料构建非酒精性脂肪肝小鼠动物模型,分别于给药后4周、8周和12周末处死,观察肝脏病理变化,计算肝指数,检测血清总胆固醇(TC)、ALT、TNF-α以及肝组织NF-κB的表达。各剂量银杏黄酮组小鼠肝指数,血清TC、ALT和TNF-α水平,肝组织NF-κBp65的表达量比模型组显著降低,肝脏脂肪变性明显减轻(P0.05或P0.01);肝组织NF-κBp65相对表达量与肝脏脂肪变性程度及血清ALT含量呈正相关(r0、P0.01或P0.05)。实验结果表明:银杏黄酮可降低NAFLD小鼠血脂、减轻肝脏脂肪变性、改善肝功能指标及肝脏大体形态,且有一定的剂量和时间依赖性;NF-κB上游炎症通路可能是其作用的主要机制。     

姜黄素对大鼠运动性心肌纤维化的保护作用

本文就姜黄素调控p38 MAPK/NF-κB信号通路对长时程、大强度运动致大鼠运动性心肌纤维化的保护作用进行了研究。SPF级雄性SD大鼠随机分为对照组(control group, C)、模型组(model group, M)、姜黄素+模型组(curcumin+model group, CM)。C组安静饲养,其余组进行6周递增负荷跑台训练。训练期间CM组灌胃姜黄素,其余组灌胃等体积0.5%羧甲基纤维素钠。训练后24 h取材,观察心肌组织形态与超微结构,检测血清、心肌相关生化指标。结果显示,心肌组织形态,M组较C组出现损伤性改变,心肌纤维出现断裂,且伴有炎症浸润、结缔组织增生现象,CM组较M组改善明显;心肌超微结构,M组线粒体嵴短缩,部分出现空泡变性,CM组无明显异常。与C组相比,M组心肌组织糖原容积分数、血清cTNI及心肌TGF-β1、TNF-α、IL-1β、p-p38 MAPK和NF-κB p65显著上升(P0.01);与M组相比,CM组心肌组织糖原容积分数、血清cTNI及心肌TGF-β1、TNF-α、IL-1β、p-p38 MAPK和NF-κB p65显著下降(P0.05或P0.01)。从而说明,姜黄素可能通过抑制p38 MAPK/NF-κB信号通路相关蛋白质过度活化和表达,调控心肌组织炎症因子合成与分泌及细胞外基质(extracellular matrix, ECM)合成与降解间的平衡,缓解心肌纤维化。     

CREB和NF-κB在p38MAPK所致脊髓星形胶质细胞活化中的作用（英文）

目的：探讨CREB和NF-κB在p38MAPK所致脊髓星形胶质细胞活化中的作用,明确脊髓星形胶质细胞活化中p38MAPK细胞信号转导途径的作用。方法：分离培养SPF大鼠脊髓星形胶质细胞,设正常组、SP刺激组（SP组,10-7mol/L）、SP刺激＋SB203580（10μmol/L）阻断p38MAPK组（SP＋SB组）、SP刺激＋PD98059（10μmol/L）阻断CREB组（SP＋PD组）、SP刺激＋SN50（10μmol/L）阻断NF-κB（SP＋SN组）。WB法、免疫荧光法、ELISA法检测12 h和24 h时p-p38、p-CREB、NF-κBp65水平及GFAP、TNF-、IL-1β水平变化。结果：SP组脊髓星形胶质细胞p-p38、p-CREB、NF-κBp65显著升高,GFAP水平显著增高,同时TNF-和IL-1β水平显著增高。与SP组比较,用SB203580阻断p38MAPK通路后,SP＋SB组p-p38、p-CREB、NF-κBp65显著降低,GFAP、TNF-和IL-1β水平显著降低。用PD98059阻断CREB通路后,SP＋PD组p-p38、NF-κBp65无显著变化,p-CREB显著降低,GFAP水平降低,同时TNF-和IL-1β水平降低。用SN50阻断NF-κB通路后,SP＋SN组p-p38、p-CREB无显著变化,NF-κBp65显著降低,GFAP水平降低,同时TNF-和IL-1β水平降低。结论：体外培养中,SP刺激后脊髓星形胶质细胞显著活化,p38MAPK活化后通过CREB及NF-κB信号途径导致胶质细胞炎性因子水平显著升高。     

基于HMGB1/TLR4/NF-κB信号通路探讨忍冬苷对脓毒症肝损伤大鼠的影响

摘要 目的：基于高迁移率族蛋白B1（HMGB1）/Toll样受体4（TLR4）/核因子κB（NF-κB）信号通路探讨忍冬苷对脓毒症肝损伤大鼠的影响。方法：60只雄性SD大鼠随机分为模型组、对照组、阳性对照组（地塞米松10 mg/kg）、忍冬苷低剂量（7.5 mg/kg）、忍冬苷中剂量（15 mg/kg）、忍冬苷高剂量（30 mg/kg）组,每组10只。采用盲肠结扎穿刺法建立大鼠脓毒症模型。实验结束后麻醉大鼠取血制备血清,检测血清中超氧化物歧化酶（SOD）活性和丙二醛（MDA）、白介素-6（IL-6）、肿瘤坏死因子-α（TNF-α）、白介素-10（IL-10）含量;分离肝组织称重,计算肝脏指数,一部分用于HE染色观察肝组织病理变化,一部分用于制备组织匀浆检测组织中肝功能指标谷丙转氨酶（ALT）、天冬氨酸转氨酶（AST）活性及HMGB1、TLR4、NF-κB蛋白表达。结果：与对照组比较,模型组大鼠血清中MDA、TNF-α、IL-6含量、肝脏指数以及肝组织中AST、ALT活性、HMGB1、TLR4、NF-κB蛋白表达显著增加（P＜0.05）,SOD活性与IL-10含量显著下降（P＜0.05）;且肝组织出现明显病灶,肝细胞水肿变性,大量炎性细胞浸润。与模型组比较,阳性对照组与忍冬苷各剂量组大鼠血清中MDA、TNF-α、IL-6含量、肝脏指数以及肝组织中AST、ALT活性、HMGB1、TLR4、NF-κB蛋白表达显著降低（P＜0.05）,SOD活性与IL-10含量显著升高（P＜0.05）;忍冬苷低、中剂量组仍可见病灶和水肿,但病变减轻;地塞米松组与忍冬苷高剂量组肝细胞结构趋于正常,未发现病灶。与阳性对照组比较,忍冬苷低、中剂量组大鼠血清中MDA、TNF-α、IL-6含量、肝脏指数以及肝组织中AST、ALT活性、HMGB1、TLR4、NF-κB蛋白表达显著升高（P＜0.05）,SOD活性与IL-10含量显著降低（P＜0.05）;忍冬苷高剂量组上述指标无显著差异（P＞0.05）。结论：忍冬苷通过下调HMGB1/TLR4/NF-κB信号通路的表达,抑制氧化应激,减轻炎症反应,改善肝功能,发挥对脓毒症肝损伤的保护作用。     

CREB 和NF-κB在p38MAPK所致脊髓星形胶质细胞活化中的作用

目的:探讨CREB和NF-κB在p38MAPK所致脊髓星形胶质细胞活化中的作用,明确脊髓星形胶质细胞活化中p38MAPK细胞信号转导途径的作用。方法:分离培养SPF大鼠脊髓星形胶质细胞,设正常组、SP刺激组(SP组,10-7mol/L)、SP刺激+SB203580(10μmol/L)阻断p38MAPK组(SP+SB组)、SP刺激+PD98059(10μmol/L)阻断CREB组(SP+PD组)、SP刺激+SN50(10μmol/L)阻断NF-κB(SP+SN组)。WB法、免疫荧光法、ELISA法检测12 h和24 h时p-p38、p-CREB、NF-κBp65水平及GFAP、TNF-、IL-1β水平变化。结果:SP组脊髓星形胶质细胞p-p38、p-CREB、NF-κBp65显著升高,GFAP水平显著增高,同时TNF-和IL-1β水平显著增高。与SP组比较,用SB203580阻断p38MAPK通路后,SP+SB组p-p38、p-CREB、NF-κBp65显著降低,GFAP、TNF-和IL-1β水平显著降低。用PD98059阻断CREB通路后,SP+PD组p-p38、NF-κBp65无显著变化,p-CREB显著降...     

黔产毛蒟挥发油对油酸致大鼠急性肺损伤的影响及其机制

为研究黔产毛蒟挥发油在油酸诱导的大鼠急性肺损伤中的作用及其机制。实验将雄性成年清洁级SD大鼠按照体重随机分为对照组、油酸模型组和毛蒟挥发油组(0.125、0.25、0.5 mL/kg)。油酸模型组大鼠采用右侧颈静脉注射油酸0.2 mL/kg形成急性肺损伤模型;毛蒟挥发油组大鼠在油酸造模前30分钟静脉注射毛蒟挥发油;建模4 h后处死,留取标本。观察各组肺组织病理学形态并进行肺损伤评分,同时测定血气分析值、右下肺湿干重、肺通透指数以及肺泡灌洗液中TNF-α、IL-6和IL-1β炎症因子的含量,最后采用免疫组化和Western Blot检测p38MAPK和p-p38MAPK蛋白的表达量。结果表明大鼠PaO_2和PaO_2/FiO_2在油酸模型组明显低于对照组,同时右下肺湿干重、肺通透指数以及肺泡灌洗液中TNF-α、IL-6和IL-1β炎症因子的含量在油酸模型组明显高于对照组。油酸模型组肺组织病理学显示肺损伤明显;毛蒟挥发油组上述指标较油酸模型组明显减轻。p-p38MAPK蛋白表达量在油酸模型组中明显高于对照组,而p-p38MAPK蛋白表达量在毛蒟挥发油组中明显低于油酸模型组。实验证明黔产毛蒟挥发油能够通过抑制p38MAPK通路减少急性肺损伤炎症因子的产生,对急性肺损伤具有较好的保护作用。     

七味净肝灵对酒精性肝损伤大鼠的保护作用研究

探讨七味净肝灵(QWJGL)对酒精性肝损伤大鼠的保护作用及作用机制。将60只大鼠随机分为正常组、模型组、水飞蓟宾组(0.18 g/kg)、QWJGL高、中、低剂量组(8、4、2 g/kg),每组10只。造模采用灌胃56%vol白酒(10 mL/kg),2 h后,各用药组灌胃给药,持续给药30天。末次给药16 h后,取血,收集肝脏、脾脏和胰腺,计算LI、SI和TI,生化法测定血清ALT、AST、MDA、SOD和GSH-Px含量,ELISA法检测肝脏中IL~(-1)β、IL-6和TNF-α含量,Western blot检测肝组织NF-κB和CD14表达,HE染色观察肝脏组织病理学变化。结果表明,QWJGL可降低酒精性肝损伤大鼠的LI(P0.05),提高SI和TI(P0.05),降低肝损伤大鼠血清中ALT和AST活性(P0.05),并且可以降低MDA含量(P0.05),增强SOD和GSH-Px活性(P0.05),降低TNF-α、IL~(-1)β和IL-6水平(P0.05),抑制肝组织NF-κB和CD14表达(P0.05)。综上,QWJGL对酒精性肝损伤有明显的保护作用,其保肝作用可能与抑制氧化应激、炎症反应和调控CD14、NF-κB蛋白表达有关。     

早期戒烟大鼠肺病理及炎性介质变化

目的观察早期戒烟后大鼠肺组织病理及炎性介质表达变化规律。方法选用Wistar雄性大鼠80只,随机分为对照组及早期戒烟后0天、1周、2周、4周、6周、8周、12周组。采用酶联免疫吸附方法测定各组大鼠血清中IL-8的蛋白质含量,S-P免疫组化学方法检测肺组织NF-κB p65的表达,并光镜下观察HE染色切片、对大鼠气道炎症进行病理学评分。结果早期戒烟组大鼠可见气道上皮细胞纤毛发生粘连、倒伏,上皮细胞空泡变形、坏死、增生,炎症细胞浸润;其血清IL-8浓度、肺组织NF-κB的表达及气道炎症病理评分在戒烟后各时相点较未吸烟对照组明显升高,有统计学意义（P〈0.05）。早期戒烟组大鼠血清IL-8的浓度、肺组织NF-κB的表达及肺组织病理炎症评分在戒烟后略有上升、且在戒烟后8周达到高峰,但随后在戒烟12周时可见IL-8的浓度有下降趋势,肺组织病理炎症反应有所减轻。结论早期戒烟大鼠在戒烟早期虽可见炎症反应略有加重,但随戒烟时间延长,仍可见炎症反应有所减轻。因此,提倡及早且坚持戒烟。     

补体系统及其在肝损伤再生中的作用

补体系统是机体免疫防御机制的重要组成部分,参与免疫识别和防御。近年来,系统研究发现补体除免疫调节外,还具有参与生殖发育、成骨、组织和器官再生等重要生理机能的作用。多项研究报道了补体活化和各种肝损伤／再生的关系,对此进行综述,以期促进对补体多样性功能的了解。     

The hedgehog pathway in nonalcoholic fatty liver disease

Nonalcoholic fatty liver disease (NAFLD) encompasses a spectrum of obesity-associated liver diseases and it has become the major cause of cirrhosis in the Western world. The high prevalence of NAFLD-associated advanced liver disease reflects both the high prevalence of obesity-related fatty liver (hepatic steatosis) and the lack of specific treatments to prevent hepatic steatosis from progressing to more serious forms of liver damage, including nonalcoholic steatohepatitis (NASH), cirrhosis, and primary liver cancer. The pathogenesis of NAFLD is complex, and not fully understood. However, compelling evidence demonstrates that dysregulation of the hedgehog (Hh) pathway is involved in both the pathogenesis of hepatic steatosis and the progression from hepatic steatosis to more serious forms of liver damage. Inhibiting hedgehog signaling enhances hepatic steatosis, a condition which seldom results in liver-related morbidity or mortality. In contrast, excessive Hh pathway activation promotes development of NASH, cirrhosis, and primary liver cancer, the major causes of liver-related deaths. Thus, suppressing excessive Hh pathway activity is a potential approach to prevent progressive liver damage in NAFLD. Various pharmacologic agents that inhibit Hh signaling are available and approved for cancer therapeutics; more are being developed to optimize the benefits and minimize the risks of inhibiting this pathway. In this review we will describe the Hh pathway, summarize the evidence for its role in NAFLD evolution, and discuss the potential role for Hh pathway inhibitors as therapies to prevent NASH, cirrhosis and liver cancer.     

Alterations in histones of the liver and oviduct of Japanese quail during aging

Age-related changes occur in histones of the liver and oviduct of the female quail. In the liver an extra histone band, named HCX, between H2A and H4, is observed that increases with age. In the oviduct, a large complex of histones is seen which is tissue-specific. This complex declines with increasing age. The changes in the histones of the oviduct of adult and old birds in response to estradiol and progesterone are age-related. In the adult, the histone-complex increases after administration of either one of the hormones. In old birds, however, it is seen only after progesterone administration. Thus, the alterations in histones in the birds are not only tissue- and age-related, but also vary in response to steroid hormones.     

Mesenchymal stromal cell-dependent immunoregulation in chemically-induced acute liver failure

Drug-induced liver injury(DILI),which refers to liver damage caused by a drug or its metabolites,has emerged as an important cause of acute liver failure(ALF)in recent years.Chemically-induced ALF in animal models mimics the pathology of DILI in humans;thus,these models are used to study the mechanism of potentially effective treatment strategies.Mesenchymal stromal cells(MSCs)possess immunomodulatory properties,and they alleviate acute liver injury and decrease the mortality of animals with chemically-induced ALF.Here,we summarize some of the existing research on the interaction between MSCs and immune cells,and discuss the possible mechanisms underlying the immunomodulatory activity of MSCs in chemically-induced ALF.We conclude that MSCs can impact the phenotype and function of macrophages,as well as the differentiation and maturation of dendritic cells,and inhibit the proliferation and activation of T lymphocytes or B lymphocytes.MSCs also have immunomodulatory effects on the production of cytokines,such as prostaglandin E2 and tumor necrosis factor-alpha-stimulated gene 6,in animal models.Thus,MSCs have significant benefits in the treatment of chemically-induced ALF by interacting with immune cells and they may be applied to DILI in humans in the near future.     

Radiomodification of glyoxalase I in the liver and spleen of mice: Adaptive response and split-dose effect

Glyoxalase system, particularly glyoxalase I (Gly I) plays an important role in regulation of cell division and is considered to be a metabolic indicator of cell proliferation. The glyoxalase system is likely to have a close link with cellular radiosensitivity. Therefore, we have examined the effect of adaptive and split-dose of -rays on the activity of Gly I in the liver and spleen of mice. For the adaptive response studies, mice pre-treated with a conditioning dose of 0.5 Gy were given a challenging dose of 4 Gy at varying time intervals. In the split-dose studies, a dose of 4 Gy was delivered into two equal fractions and spaced at different time intervals. The results show that pre-exposure to a conditioning dose or the fractionation of total dose decreased the specific activity of Gly I in the liver and spleen of mice. The decreased activity of Gly I was suggestive of protective action induced by the conditioning dose and fractionation of dose. The similar pattern of radiation response of Gly I probably supported the possibility of involvement of a common pathway in the radiation-induced adaptive and split-dose effect. From these observations a close link between the Gly I and the adaptive-response as well as the split-dose effect is speculated. Since, the glyoxalase system is vital for a variety of biological functions including cell division and repair, the present findings may have relevance in understanding the dose-fractionation as well as the biological defence induced by low doses of radiations.     

虫草素对四氯化碳所致小鼠急性肝损伤的保护作用

本文探究蛹虫草活性成分虫草素对四氯化碳（CCl₄）造成的小鼠急性肝损伤的保护作用及其分子机制。首先建立四氯化碳致小鼠急性肝损伤的动物模型,通过检测血清生化指标、肝功指标的变化及HE染色观察组织切片病理的病变情况,评价虫草素的保肝效果,进一步通过Western blot检测虫草素能否通过激活Nrf-2/Keap1信号通路及其下游抗氧化因子（HO-1、NQO-1）的表达来提高机体抗氧化损伤能力以及抑制炎症因子（TNFα、TNFβ、IL-6、IL-10）的表达。对比模型组结果显示,虫草素能极显著降低（P<0.01）小鼠血清中ALT、AST及肝脏中MDA水平,并能极显著提高肝脏中SOD水平（P<0.01）;HE染色结果显示虫草素能有效降低改善受损肝组织中的炎细胞浸润及纤维组织增生;Western blot结果表明虫草素能够通过激活Nrf-2信号通路,促进下游抗氧化因子及抗炎因子的表达,从而降低炎症反应。虫草素对CCl₄致小鼠急性肝损伤具有一定的保护作用,其机制与Nrf-2信号通路相关,实验结果为后续蛹虫草及虫草素的开发应用奠定基础。     

红托竹荪多糖对大鼠酒精性肝损伤的保护作用

研究红托竹荪多糖(Dictyophora rubrovalvata polysaccharide,DRP)对酒精所致大鼠肝损伤的保护作用.采用苯酚-硫酸法测得DRP的含量为74.68％±1.32％,利用傅里叶红外光谱初步分析表明DRP是含有α-糖苷键和β-糖苷键的吡喃环多糖.当DRP浓度达到3.0 mg/mL时,DPP...     

Influence of some biological response modifiers on swelling of rat liver mitochondriain vitro

In order to understand any involvement of altered calcium functions in peroxidative membrane damage, the effect of a few chemicals, known to modify specific biological responses involving calcium related functions on mitochondrial swellingin vitro was studied. Histamine caused swelling, whereas antihistamines reduced calcium induced swelling. Anti-inflammatory agents aspirin and indomethacin did not affect the initial rapid phase of swelling but reduced the swelling during the later phase. The uncouplers of oxidative phosphorylation and electron transport chain blockers such as dinitrophenol (DNP), antimycin-A and rotenone reduced swelling and the respiratory inhibitors KCN and sodium azide completely abolished it. Trifluoperazine, an anti-calmodulin agent did not influence the initial phase of calcium induced swelling but in the subsequent phase swelling was reduced. c-AMP as well as calcium ionophores, calcimycin and lasalocid acid, potentiated swelling. Thus agents capable of modulating calcium functions could influence thein vitro swelling of mitochondria.