亚甲蓝预处理对大鼠肝缺血再灌注肺损伤的保护作用

目的研究肝缺血再灌注后肺损伤的机制以及亚甲蓝的保护作用。方法 36只SD大鼠随机分为假手术组（S组,n=12）、缺血再灌注组（I/R组,n=12）和亚甲蓝处理组（MB组,n=12）。阻断肝门30分钟后开放血流,建立大鼠全肝缺血再灌注模型。I/R组与MB组分别于肝门阻断前10分钟腹腔注射亚甲蓝10mg/kg或相应剂量生理盐水,于再灌注1小时取血、处死动物。假手术组不阻断肝门,于上述相应时间点注射生理盐水与取血、处死动物。肝肺病理切片光镜观察、肺干湿重比、肺组织丙二醛（MDA）含量、髓过氧化物酶（MPO）活力、血清TNF-α和IL-8含量。结果病理结果显示,亚甲蓝组缺血再灌注后肺损害程度较缺血再灌注组减轻。缺血再灌注组较假手术组肺组织干湿重比、MDA含量、MPO活性和血清TNF-α和IL-8含量升高（P〈0.01）,而亚甲蓝组较缺血再灌注组肺组织干湿重比和血清TNF-α和IL-8含量（P〈0.01）,MDA含量和MPO活性（P〈0.05）均有下降。结论肝缺血再灌注会导致肺损伤,缺血前给予亚甲蓝对大鼠肝I/R后肺损伤具有有保护作用。     

利多卡因对脓毒症大鼠肺损伤的影响

目的 研究利多卡因对脓毒症大鼠肺损伤的影响.方法 选择清洁级SD成年雄性大鼠30只,2月龄,体重250～300 g.采用随机数字表法将大鼠分为三组:假手术组(S组)、盲肠结扎穿孔组(C组)和利多卡因组(L组),每组10只.S组仅打开腹腔后缝合,C组和L组采用盲肠结扎穿孔法(CLP)建立脓毒症模型.L组建立脓毒症模型后即...     

The effects of methylene blue on renal scarring due to pyelonephritis in rats

The aim of this study was to evaluate the efficiency of methylene blue (MB) in preventing renal scar formation after the induction of pyelonephritis (PNP) in a rat model with delayed antimicrobial therapy. An inoculum of the K-12 strain of Escherichia coli was injected into both kidneys. Control groups received isotonic saline instead of bacterial solution. Four equal groups were then formed: the PNP group was untreated and the PNP ciprofloxacin (CIP) treated group was treated only with CIP intraperitoneally (i.p.) starting on the third day following bacterial inoculation. In the PNP (MB)-treated group, MB was given i.p., and in the PNP MB + CIP-treated group, MB + CIP were administered i.p.. In the sixth week following bacterial inoculation, all rats were sacrificed, and both kidneys of the rats in all groups were examined biochemically and histopathologically for renal scarring. Renal scar was significant in the groups treated with MB alone or MB + CIP combination compared with untreated or antibiotic only groups. Delayed treatment with antibiotics had no effect on scarring. These results suggest that the addition of MB to the delayed antibiotic therapy might be beneficial in preventing PNP-induced oxidative renal tissue damage.     

亚甲蓝对兔肠缺血再灌注时肺损伤的影响

目的评价亚甲蓝（MB）对兔肠缺血再灌注时肺损伤的影响。方法健康新西兰白兔36只,体重2.5～3.5 kg,雄雌不拘,随机分为3组（n=12）,假手术组（S组）不夹闭肠系膜上动脉;缺血再灌注组（I/R组）：夹闭肠系膜上动脉1 h,再灌注3 h;MB组再灌注前即刻静脉注射亚甲蓝10 mg/kg。再灌注3 h时,抽取静脉血,测定血清肿瘤坏死因子-α（TNF-α）、白细胞介素-8（IL-8）及总蛋白浓度;取右肺下叶组织,测定肺组织湿/干重比（W/D）和Na^＋-K^＋-ATPase活性;测定支气管肺泡灌洗液（BALF）中蛋白浓度,并计算其与血清总蛋白浓度的比值,表示肺通透指数;光镜及电镜下观察肺组织结构,并进行中性粒细胞（PMN）计数。结果与S组比较,I/R组血清TNF-α、IL-8浓度及BALF蛋白浓度、PMN计数、肺通透指数和W/D升高,Na^＋-K^＋-ATPase活性降低,MB组PMN计数、BALF蛋白浓度和肺通透指数升高,Na^＋-K^＋-ATPase活性降低（P〈0.05或0.01）;与I/R组比较,MB组血清TNF-α、IL-8及BALF蛋白浓度、PMN计数、肺通透指数和W/D降低,Na^＋-K^＋-ATPase活性升高（P〈0.05或0.01）。MB组肺组织结构损伤轻于I/R组。结论再灌注前即刻静脉注射亚甲蓝10 mg/kg可减轻兔肠缺血再灌注时肺损伤,与抑制肺组织Na^＋-K^＋-ATPase活性降低及减轻炎性反应有关。     

亚甲蓝对大鼠机械通气相关肺损伤中核苷酸结合寡聚化结构域样受体蛋白3炎性小体的影响

目的评价亚甲蓝对大鼠机械通气相关损伤(VILI)中核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)炎性小体的影响。方法清洁级成年雄性SD大鼠36只,8周龄,体重240～260 g,采用随机数字表法分为三组:自主呼吸对照组(C组)、大潮气量模型组(H组)和大潮气量+亚甲蓝组(MB组),每组12只。三组大鼠均行气管切开插管术,MB组经腹腔注射1%亚甲蓝50 mg/kg,10 min后以V_T 20 ml/kg行机械通气;C组经腹腔注射等容量生理盐水后保持自主呼吸;H组经腹腔注射等容量生理盐水,10 min后以V_T 20 ml/kg行机械通气。通气参数:FiO_2 21%,I∶E 1∶1,RR 80次/分,PEEP 0,通气时间4 h。于基础状态、通气结束时经颈总动脉取血行血气分析,通气结束后颈总动脉放血处死大鼠,收集肺组织标本、支气管肺泡灌洗液(BALF)。光镜下观察肺组织病理学改变,记录肺损伤评分,计算肺组织湿/干重比值(W/D)。采用ELISA法测定BALF中总蛋白含量以及血清、BALF中白细胞介素(IL)-1β、IL-18浓度;鲁米诺化学发光法检测肺组织中活性氧(ROS)含量;RT-PCR法及Western blot法分别检测肺组织NLRP3、凋亡相关斑点样蛋白(ASC)、天冬氨酸半胱氨酸蛋白酶-1(caspase-1)mRNA表达量及蛋白含量。结果与C组比较,H组肺损伤评分、W/D明显升高(P0.01),BALF中总蛋白以及血清、BALF中IL-1β和IL-18浓度明显升高(P0.01),肺组织中ROS含量、NLRP3、ASC、caspase-1 mRNA表达量及蛋白含量明显升高(P0.01)。与H组比较,MB组肺损伤评分、W/D明显降低(P0.05),BALF中总蛋白以及血清、BALF中IL-1β和IL-18浓度明显降低(P0.05),肺组织中ROS含量、NLRP3、ASC、caspase-1 mRNA表达量及蛋白含量明显降低(P0.05)。结论亚甲蓝通过抑制大鼠肺组织中NLRP3炎性小体的激活,阻碍促炎因子IL-1β及IL-18的形成,减轻大鼠VILI。     

The ameliorative effects of methylene blue on testicular damage induced by cisplatin in rats

Cisplatin, a common chemotherapeutic drug, can induce testicular toxicity. Methylene blue, a potent antioxidant, can inhibit the generation of free radicals. This research aimed to study the protective effect of methylene blue against the cisplatin-induced toxicity of the reproductive system in rats. 35 male Wistar rats were divided into five groups: the control group, the cisplatin group (a single dose of 5 mg/kg cisplatin), the low-dose and high-dose methylene blue + cisplatin (2 and 4 mg/kg of methylene blue, respectively, for 7 days) and the methylene blue group (4 mg/kg of methylene blue, for 7 days). The treatments were applied through intraperitoneal injection. Cisplatin treatment reduced the sperm parameters and serum testosterone levels significantly. Methylene blue treatment increased the sperm count (p < .001), viability (p < .001) and motility (p < .001) compared to the cisplatin group. The methylene blue group showed a significant increase in the levels of testosterone compared to the cisplatin group (p < .001) and reverted histopathological changes in cisplatin-treated groups. Immunohistochemical evaluation of the caspase-3 protein revealed that the treatment with methylene blue has significant anti-apoptotic effects on testicular tissue damage. In conclusion, methylene blue can attenuate the cisplatin-induced histological damages and improve the sperm parameters.     

亚甲蓝对感染性休克患者术中氧代谢的影响

目的 探讨亚甲蓝对感染性休克患者术中氧代谢的影响.方法 行急诊手术的感染性休克患者40例,ASA分级Ⅱ或Ⅲ级,年龄38～64岁,体重48～75 kg,随机分为2组(n=20):去甲肾上腺素组(NE组)和亚甲蓝组(MB组).人室后NE组静脉输注去甲肾上腺素0.5～2.0μg·kg-1·min-1至术毕,MB组静脉输注亚甲蓝0.5～1.0 mg·kg-1·h-1至术毕.静脉注射咪达唑仑-依托咪酯-舒芬太尼-维库溴铵麻醉诱导,经口气管插管行机械通气,术中吸入七氟醚,间断静脉注射维库溴铵和舒芬太尼维持麻醉.于麻醉诱导前(T0)、手术开始前(T1)、手术开始后30 min(T2)、60 min(T3)、90 min(T4)及术毕时(T5)记录HR、SvO2、MAP、CVP、每搏量,计算外周血管阻力指数(SVRI)、CI.于上述时点采集桡动脉和颈内静脉血样行血气分析,并测定动脉血乳酸(Lac)浓度,计算氧供指数(DO2I)、氧耗指数(VO2I)和氧摄取率(ERO2).结果 与NE组比较,MB组MAP、HR、CVP、SVRI、DO2I、VO2I和ERO2升高,CI和Lac降低(P＜0.05).与T0时比较,T2～5时MB组MAP、HR、CVP、SVRI、VO2I、DO2I和ERO2升高,CI和Lac降低,NE组CI和Lac降低,SVRI、VO2I和ERO2升高(P＜0.05),DO2I差异无统计学意义(P＞0.05).结论术中应用0.5～1.0 mg·kg-1·h-1亚甲蓝不仅可改善感染性休克患者术中血液动力学,还可改善机体氧代谢.     

雷帕霉素联合罗格列酮对脓毒症大鼠肺损伤的影响

目的 评价雷帕霉素联合罗格列酮对脓毒症大鼠肺损伤的影响.方法 健康雄性Wistar大鼠120只,2月龄,体重250～ 300 g,采用随机数字表法,将其分为5组(n=24):假手术组(S组)、盲肠结扎穿孔组(CLP组)、雷帕霉素组(RPM组)、罗格列酮组(RGZ组)和雷帕霉素+罗格列酮组(RPM+ RGZ组).CLP组、RPM组、RGZ组和RPM+ RGZ组采用盲肠结扎穿孔术法制备大鼠脓毒症模型.术前30 min RPM组于皮下注射雷帕霉素0.4 mg/kg,RGZ组股静脉注射罗格列酮0.3 mg/kg,RPM+ RGZ组皮下注射雷帕霉素0.4 mg/kg联合股静脉注射罗格列酮0.3 mg/kg,CLP组给予等容量生理盐水.于术后2、6、24和48 h时分别处死6只大鼠,取肺组织,行HE染色,光镜下观察,进行肺损伤评分;采用分光光度法检测肺组织髓过氧化物酶(MPO)活性;采用凝胶阻滞电泳分析法检测肺组织信号转导和转录激活因子3(STAT3) DNA结合活性.结果 与S组比较,CLP组、RPM组、RGZ组和RPM+ RGZ组肺损伤评分、肺组织MPO活性和STAT3 DNA结合活性升高(P＜0.05);与CLP组比较,RPM组、RGZ组和RPM+ RGZ组肺损伤评分、肺组织MPO活性及STAT3 DNA结合活性降低(P＜0.05);与RPM组及RGZ组比较,RPM+ RGZ组肺损伤评分、肺组织MPO活性及STAT3 DNA结合活性降低(P＜0.05).结论 与雷帕霉素或罗格列酮单独用药比较,二者联合应用减轻脓毒症大鼠肺损伤的效应更明显,其机制与抑制STAT3信号通路激活有关.     

亚甲蓝对兔肝缺血再灌注损伤的影响

目的 探讨亚甲蓝对兔肝缺血再灌注损伤的影响.方法 健康成年新西兰大白兔24只,雌雄不拘,体重2.0～2.3 kg,随机分为3组(n=8):假手术组(S组)、肝缺血再灌注组(I/R组)和亚甲蓝组(MB组).I/R组及MB组采用夹闭肝左外叶、中叶、右中叶及方形叶肝动脉分支40min再灌注60 min的方法制备肝缺血再灌注模型,S组仅游离相应血管.MB组于再灌注前20 min经耳缘静脉注射亚甲蓝5 mg/kg(用生理盐水稀释至5 ml),S组及I/R组给予等容量生理盐水.于缺血前即刻(T1)、缺血20 min(T2)、加min(T3)、再灌注1 min(T4)、再灌注5 min(T5)、30 min(T6)、60 min(T7)时记录MAP和HR.于T1,5-7时取股动脉血样1 ml,测定血清TNF-α及IL-6的浓度.分别于T1,6,7时取股动脉血样1.5 ml,测定血浆ALT及AST的活性.于T7时测定肝左叶组织SOD活性及MDA含量,光镜下观察肝组织病理学结果.结果 与S组比较,I/R组T4-7,时MAP降低,T7时HR降低,肝组织SOD活性降低,MDA含量升高,I/R组及MB组T3-5时血清TNF-α和IL-6浓度升高,T6,7时血浆ALT和AST活性升高(P<0.05或0.01);与I/R组比较,MB组T4-7时MAP升高,肝组织SOD活性升高,MDA含量降低,T3-5时血清TNF-α和IL-6浓度降低,T6,7时血浆ALT和AST活性降低(P<0.05或0.01).MB组肝组织损伤较I/R组减轻.结论 亚甲蓝可维持血液动力学稳定,减轻兔肝缺血再灌注损伤.     

丙泊酚对大鼠机械通气相关肺损伤的保护作用及机制

目的 探讨丙泊酚对大鼠机械通气相关肺损伤影响的作用机制.方法 24只Wistar清洁级大鼠随机分为3组(n=8),采用压力控制机械通气模式通气4 h.A组为模型组,通气模式为吸气峰压(PIP)=25 cm H2O(1 cm H2O=0.098 kPa),呼气末正压(PEEP)=2 cm H2O;B、c组为同时输注丙泊酚组,通气模式同A组,B组输注模式为静注2mg/kg,继以4mg·kg-1·h-1速度持续输注;C组输注模式为5 mg/kg,继以10 mg·kg-1·h-1速度持续输注,记录基础时点、1、2、3、4 h的MAP、HR和动脉血气.4 h后处死全部大鼠,测量肺组织湿/干比(W/D),支气管肺泡灌洗液(bronchoalveolar lavage fluid,BALF)中总蛋白、肿瘤坏死因子α(tumor necrosis factora,TNF-α)、白介素1β(interleukin1β,IL-1β)、白介素6(interleukin6,IL-6)、白介素10(interleukin10,IL-10)和巨噬细胞炎性蛋白2(macrophage inflammatorv protein2,MIP-2)的含量,肺组织匀浆中丙二醛(malondialdehyde,MDA)和超氧化物歧化酶(superoxide dismutase,SOD)的含量,观察肺组织病理形态学变化.结果 A组MAP和PaO2在4 h时显著降低,由(116.0±7.4)mm Hg(1 mm Hg=0.133 kPa)和(379±65)mm Hg降低到(73±21)mm Hg和(103±48)mm Hg,与基础值相比差异有统计学意义(P<0.05),而B、C组与基础值相比差异无统计学意义.在4 h时A组的PaCO2显著升高(P<0.05),而B、C两组与基础值相比差异无统计学意义.肺组织湿/干比、BALF中总蛋白含量、TNF-α和MIP-2浓度A组明显高于B、C组(P<0.05),肺组织匀浆巾MDA浓度A组明显高于B、C组(P<0.05),A组SOD浓度也有所降低,但和B、C组差异无统计学意义.肺组织学病理评分B、C组也好于A组(P<0.05),B、C组间差异无统计学意义.结论 丙泊酚可减轻大鼠机械通气相关肺损伤,其机制可能与其减少炎症因子的释放,减少中性粒细胞在肺内的积聚,抑制过氧化损伤有关.     

丙泊酚对大鼠机械通气相关肺损伤的保护作用及机制

Objective To investigate the mechanisms of propofol on ventilator-induced lung injury in rats produced by high PIP ventilation. Methods Twenty-four anesthetized Wistar rats weighting 280 g-320 g were randomly divided into tlhree groups (n=8). Rats were ventilated with high PIP pattern (PIP=25 cm H2O,PEEP=2 cm H2O) for 4 h. Propofol was given in a bolus of 2 mg/kg (group B) or 5 mg/kg (group C), followed by continuous infusion with 4 mg·kg-1·h-1 (group B)or 10 mg·kg-1·h-1(group C). No Propofol was given for group A. MAP, HR were recorded and arterial blood gases were analyzed. Lung wet and dry weight ratio( W/D), tumor necrosis factora(TNF-α), interleukin1β(IL-1β), IL-6, IL-10, macrophage inflammatory protein2(MIP-2) and protein content in bronchoalveolar lavage fluid (BALF) , content of malondialdehyde (MDA) and superoxide dismutase (SOD) in lung homogenate were determined.Pathological change of lung was examined and lung injury was scored as well. Results MAP and PaO2 decreased from (116±7.4) mm Hg and (379±65) mm Hg to (73±21 )mm Hg and (103±48)mm Hg, and PaCO2 increased at fourth hour in group A(P<0.05). PaO2 in group B and C were higher than in group A after 3 h(P<0.05). Lung W/D weight ratio, TNF-α, MIP-2 and protein content in BALF were higher in group A (P<0.05), and MDA was higher in group A (P<0.05). No significant difference between group B and C. Pathological changes of lung in group B and C were all better than those in group A. Conclusion Propofol may attenuate VILI in rats partly by reducing the release of cytokine, decreasing the accumulation of neutrophil in the lung, and inhibiting peroxidized injury.     

丙泊酚对大鼠机械通气相关肺损伤的保护作用及机制

Objective To investigate the mechanisms of propofol on ventilator-induced lung injury in rats produced by high PIP ventilation. Methods Twenty-four anesthetized Wistar rats weighting 280 g-320 g were randomly divided into tlhree groups (n=8). Rats were ventilated with high PIP pattern (PIP=25 cm H2O,PEEP=2 cm H2O) for 4 h. Propofol was given in a bolus of 2 mg/kg (group B) or 5 mg/kg (group C), followed by continuous infusion with 4 mg·kg-1·h-1 (group B)or 10 mg·kg-1·h-1(group C). No Propofol was given for group A. MAP, HR were recorded and arterial blood gases were analyzed. Lung wet and dry weight ratio( W/D), tumor necrosis factora(TNF-α), interleukin1β(IL-1β), IL-6, IL-10, macrophage inflammatory protein2(MIP-2) and protein content in bronchoalveolar lavage fluid (BALF) , content of malondialdehyde (MDA) and superoxide dismutase (SOD) in lung homogenate were determined.Pathological change of lung was examined and lung injury was scored as well. Results MAP and PaO2 decreased from (116±7.4) mm Hg and (379±65) mm Hg to (73±21 )mm Hg and (103±48)mm Hg, and PaCO2 increased at fourth hour in group A(P<0.05). PaO2 in group B and C were higher than in group A after 3 h(P<0.05). Lung W/D weight ratio, TNF-α, MIP-2 and protein content in BALF were higher in group A (P<0.05), and MDA was higher in group A (P<0.05). No significant difference between group B and C. Pathological changes of lung in group B and C were all better than those in group A. Conclusion Propofol may attenuate VILI in rats partly by reducing the release of cytokine, decreasing the accumulation of neutrophil in the lung, and inhibiting peroxidized injury.     

亚甲蓝对感染性休克犬肠道灌注和氧合的影响

目的　研究鸟苷酸环化酶抑制药亚甲蓝对感染性休克犬肠道灌注和氧合的影响。方法　静脉注入内毒素诱导的 7只感染性休克犬模型 ,输注 0 9%氯化钠复苏后 15分钟内注入亚甲蓝2mg/kg。血流量仪测定基础、休克 1小时后、复苏后和亚甲蓝注入后 30分钟肠系膜上动脉血流量。分析动脉和肠系膜上静脉血气 ,计算肠道氧合。结果　犬感染性休克后 ,肠系膜上动脉 (肠道 )血流减少 6 1 8% (P <0 0 1) ,氧输送 (DO2 )减少 6 2 1% (P <0 0 1) ,氧摄取 (O2 extr)增加 2 3 5 %。复苏至肺动脉嵌压为 (12 1± 1 4 )mmHg后 ,肠道血流增加 5 4 6 % (P <0 0 1) ,DO2 增加 12 8% (P <0 0 1) ,O2 extr增加 2 0 9%。亚甲蓝注入后 ,肠道血流增加 19 4 % (P <0 0 1) ,DO2 则无明显变化 (P >0 0 5 ) ,O2 extr增加 14 8%。结论　感染性休克后肠道血流灌注减少 ,氧耗增加 ;液体复苏仅部分恢复肠道灌注 ;亚甲蓝增加肠道灌注和氧摄取     

卡巴胆碱对脓毒症大鼠促炎症细胞因子所致心肌损伤的保护作用

目的：研究卡巴胆碱对脓毒症大鼠促炎症因子所致心肌损伤的保护作用。方法：雄性SD大鼠32只,采用盲肠结扎穿孔术（CLP）制备大鼠脓毒症模型,随机分为CLP组、卡巴胆碱干预组（CAR组）,每组16只。CLP术后立即静脉注射CAR10μg／kg（CAR组）或等量生理盐水（CLP组）。各组大鼠于CLP术后6h和12h取血检测血浆肌酸激酶同工酶（CK—MB）活性;然后处死动物,取心肌组织,测定肿瘤坏死因子-α（TNF-α）水平、一氧化氮（NO）含量、髓过氧化物酶（MPO）活性以及组织含水率。结果：CLP术后6h和12h,CAR组血浆CK—MB水平显著低于CLP组（P〈0．05）,CAR组心肌组织TNF-α水平、N0含量和MPO活性显著低于CLP组（P〈0．05）。CAR组心肌组织含水率均低于CLP组[6h：（69．5±2．3）％vs．（74．3±2．6）％,P〈0．05;12h：（71．4±2．4）％vs．（76．7±2．1）％,P〈0．05]。结论：卡巴胆碱能显著抑制脓毒症大鼠心肌促炎症因子水平,减轻心肌组织水肿和功能损害。卡巴胆碱的抗炎和心肌保护作用机制可能与兴奋胆碱能抗炎通路有关。     

Prolonged methylene blue infusion in refractory septic shock: a case report

Purpose

Methylene blue (MB) has been advocated for the treatment of refractory hemodynamic instability in patients with septic shock. However, the use of MB infusions in septic shock is not considered standard treatment, and the available literature describes infusions of short duration, typically less than six hours.

Clinical features

We report a case of septic shock in a 67-yr-old male who required maximal vasopressor support with norepinephrine, epinephrine, and vasopressin. Despite standard protocols for the treatment of septic shock, the patient’s hemodynamic status was refractory 80 hr post admission. However, initiation of a MB infusion resulted in the rapid restoration of hemodynamic stability and a subsequent decrease in vasopressor requirements. Multiple attempts to discontinue the MB infusion resulted in immediate and repeated increases in vasopressor requirements, necessitating a continuous infusion with a slow taper of MB for 120 hr. Ultimately, the patient survived the illness and was discharged home. We observed no adverse events that could be attributed to the use of MB.

Conclusion

In our patient, the use of MB resulted in hemodynamic stability unattained with standard vasopressor support. Further research is warranted on the use of MB in patients with septic shock.     

乌司他丁明显减轻肠源性脓毒症大鼠氧自由基介导性肺损伤

目的 观察乌司他丁(ulinastatin,UTI)对肠源性脓毒症大鼠肺组织及血中过氧化物歧化酶(superoxide dismutase,SOD)及丙二醛(malondialdehyde,MDA)的影响.方法 健康Wistar大鼠114只,雌雄各半,体重180 g～220g,分为正常对照组(NC组,n=6)、假手术对...     

盐酸氨溴索预先给药对内毒素诱导大鼠急性肺损伤的作用

目的探讨盐酸氨溴索（AMB）预先给药对内毒素（LPS）诱导大鼠急性肺损伤（ALI）的作用及其机制。方法雄性SD大鼠108只，体重196～273g，12～14周龄。随机分为6组（n=18），A组生理盐水（NS）0．5ml腹腔注射（i．p．）1h后，再i．p．NS0．5ml；B组i．p．AMB 10mg／kg 1h后i．p．NS0．5ml；C组i.p．NS0．5ml 1h后i．p．LPS 5mg／kg；D、E、F组分别i．p．AMB5、10、20mg／kg后1hi．p．LPS5mg／kg。i．p．NS（A、B组）或LPS（C、D、E、F组）后1、2、4h各处死5只大鼠，采用双夹心抗体酶联吸附免疫法测定支气管肺泡灌洗液（BALF）中肿瘤坏死因子-α（TNF-α）、白细胞介素-1β（IL-1β）和巨噬细胞炎性蛋白-2（MIP-2）浓度，蛋白印迹法检测肺组织细胞胞浆中磷酸化／非磷酸化c—Jun氨基末端激酶（JNK）的表达。另外3只i．p．NS（A、B组）或LPS（C、D、E、F组）后4h观察大鼠肺组织形态学变化。结果与A组比较，C、D、E、F组BALF中TNF-α、IL-1β和MIP-2升高；与C组比较，E、F组上述三指标均降低。与A组比较，C、D、E、F组磷酸化JNK表达增多；与C组比较，E、F组磷酸化JNK表达减少，D、E、F组非磷酸化JNK表达增多（P〈0．05或0．01）。AMP预先给药可减轻i．p.LPS诱导的肺组织损伤。结论AMB预先给药可减轻LPS诱导大鼠ALI，其机制与抑制肺组织JNK的活化、下调TNF-α、IL-1β和MIP-2的表达有关．且呈剂量依赖性。     

The role of C5 in septic lung injury.

One proposed mechanism for the pathogenesis of lung injury in septic animals is the stimulation by C5a of granulocytes to produce and release toxic oxygen radicals that damage cellular membranes in pulmonary capillaries. The authors have investigated the possible role of C5 in septic lung injury, utilizing C5-sufficient and C5-deficient twin mice strains. In this lethal sepsis model, mean survival time is increased in C5-deficient mice in comparison to the survival of their C5-sufficient twins. Morphometric results demonstrate a significant increase in intracapillary granulocrit and air-blood barrier thickness 24 hours after cecal ligation and puncture in C5-sufficient septic mice. Similarly, mean arterial pO2 is significantly decreased in the C5-sufficient animals. Intracapillary granulocrit, air-blood barrier thickness, and arterial pO2 are normal in the septic C5-deficient twins of these animals. These data support the hypothesis that C5 is involved in the pathogenesis of septic lung injury.