Therapeutic effect of liposomal-N-acetylcysteine against acetaminophen-induced hepatotoxicity

Abstract

Background: Acetaminophen (APAP) is an antipyretic analgesic drug that when taken in overdose causes depletion of glutathione (GSH) and hepatotoxicity. N-acetylcysteine (NAC) is the antidote of choice for the treatment of APAP toxicity; however, due to its short-half-life repeated dosing of NAC is required.

Purpose: To determine whether a NAC-loaded liposomal formulation (Lipo-NAC) is more effective than the conventional NAC in protecting against acute APAP-induced hepatotoxicity.

Methods: Male Sprague–Dawley rats were challenged with an intragastric dose of APAP (850?mg/kg b.wt.); 4?h later, animals were administered saline, NAC, Lipo-NAC or empty liposomes and sacrificed 24?h post-APAP treatment.

Results: APAP administration resulted in hepatic injury as evidenced by increases in plasma bilirubin, alanine (AST) and aspartate (ALT) aminotransferase levels and tissue levels of lipid peroxidation and myeloperoxidase as well as decreases in hepatic levels of reduced GSH, GSH peroxidase and GSH reductase. Treatment of animals with Lipo-NAC was significantly more effective than free NAC in reducing APAP-induced hepatotoxicity. Histological evaluation showed that APAP caused periacinar hepatocellular apoptosis and/or necrosis of hepatocytes around the terminal hepatic venules which was reduced by NAC treatment, the degree of reduction being greater for Lipo-NAC.

Conclusion: These data suggest that administration of Lipo-NAC ameliorated the APAP-induced hepatotoxicity.     

sRAGE对脂多糖介导的小鼠急性肺损伤的保护作用

目的探讨可溶性晚期糖基化终末产物受体(sRAGE)对脂多糖(LPS)介导的小鼠急性肺损伤(ALI)的保护作用。方法向小鼠气管内滴注LPS建立ALI模型,造模后1h sRAGE组腹腔注射100μg sRAGE,于24 h留取标本,检测各组动物支气管肺泡灌洗液(BALF)中白细胞及中性粒细胞数量、蛋白浓度和肿瘤坏死因子(TNF)α-水平,并对肺组织进行病理学观察。结果LPS滴注24 h后,BALF中白细胞总数和中性粒细胞数量显著增加,蛋白含量升高,TNFα-释放增多,肺组织出现典型的ALI病理损害,sRAGE干预显著降低了BALF中白细胞及中性粒细胞数量、蛋白含量和TNFα-水平,减轻了LPS引起的肺组织病理改变。结论应用sRAGE阻止RAGE信号通过抑制LPS引起的肺内中性粒细胞聚集、肺毛细血管渗出、炎症因子TNFα-释放,对ALI发挥保护作用。     

胆红素对内毒素致大鼠急性肺损伤的保护作用

目的探讨胆红素对内毒素致急性肺损伤(ALI)的保护作用及其可能机制。方法将雄性Wis-tar大鼠30只随机分为正常对照组、ALI模型组和胆红素干预组。检测肺系数(LI)、支气管肺泡灌洗液(BALF)中白细胞(WBC)计数和中性粒细胞(PMN)百分比、蛋白质含量(Pr)、肺泡通透指数(LPI);采用原位杂交技术半定量法和免疫组织化学染色测定肺血管内皮细胞间黏附分子1(ICAM-1)mRNA、核因子κB(NF-κB)和其抑制蛋白I-κBα的表达。结果①ALI模型组LI、BALF中WBC计数、PMN百分比和Pr及LPI均显著高于正常对照组(P均<0.01);胆红素干预组LI、BALF中WBC计数和LPI均显著低于ALI模型组(P均<0.01),PMN百分比和Pr也明显低于ALI模型组(P均<0.05),且与正常对照组差异无统计学意义(P>0.05)。②ALI模型组肺血管内皮ICAM-1 mRNA表达和胞核NF-κB含量与正常对照组比较显著升高(P均<0.01),胞质I-κBα水平却明显降低(P<0.01);胆红素干预组ICAM-1 mRNA表达和胞核NF-κB与模型组相比明显减低(P<0.01),胞质I-κBα含量显著升高(P<0.01),但与正常对照组比较差异有统计学意义(分别P<0.05、P<0.01)。结论胆红素通过抑制NF-κB和ICAM-1 mRNA的表达而减少中性粒细胞肺内浸润来对抗大鼠急性肺损伤。     

PTEN抑制剂对大鼠内毒素性急性肺损伤的保护作用

目的研究PTEN抑制剂phen对内毒素导致的急性肺损伤的作用及其可能机制。方法取32只成年♂SD大鼠,随机分为LPS组与phen+LPS组(n=16),比较两组大鼠48h的死亡率。另取60只成年♂SD大鼠随机分为4组:对照组(control组,n=6),LPS组(n=24),phen+LPS组(n=24)以及phen组(n=6)。其中LPS组和phen+LPS组在注射LPS后1、3、6、12h又被分为4个亚组。分别检测各组大鼠支气管肺泡灌洗液(BALF)中蛋白、TNF-α和IL-6的浓度,观察肺组织的病理变化,以及肺组织中p-Akt的表达情况。结果 phen+LPS组死亡率明显低于LPS组(P<0.05)。LPS组大鼠BALF中的蛋白、TNF-α和IL-6的浓度明显升高(P<0.05),肺组织破坏明显,可见肺泡内出血、肺间质水肿、肺泡萎陷及大量炎性细胞浸润,p-Akt表达明显受抑。与LPS组比较,phen+LPS组肺组织损伤程度轻,BALF中的蛋白渗出、TNF-α和IL-6的释放减少(P<0.05),肺组织p-Akt表达增多(P<0.05)。结论 PTEN抑制剂phen能明显缓解LPS诱导的急性肺损伤。     

Prophylaxis against lipopolysaccharide-induced lung injuries by liposome-entrapped dexamethasone in rats

Lipopolysaccharide (LPS), a component of the cell wall of Gram-negative bacteria, stimulates phagocytes to generate metabolites that play an important role in the pathogenesis of acute lung injury. In this study, the prophylactic effect of liposome-entrapped dexamethasone (L-DEX) was evaluated in an animal acute lung injury model. Rats were pretreated intratracheally with L-DEX or dexamethasone phosphate (DEX) at a dose of 800 microg dexamethasone/kg body weight; 1 hr later, pretreated animals were challenged i.v. with LPS (Escherichia coli 0111:B4, 1 mg/kg body weight) and killed 24 hr later. Challenge of saline-pretreated animals with LPS resulted in lung injury, as evidenced by increases in wet lung weight and decreases in lung angiotensin-converting enzyme and alkaline phosphatase activities, injury markers of pulmonary capillary endothelial and alveolar type II epithelial cells, respectively. Also, LPS injection resulted in significant increases in plasma phospholipase A(2), thromboxane B(2), and leukotriene B(4) concentrations. The LPS challenge also increased pulmonary myeloperoxidase and elastase activities as well as chloramine concentrations, suggestive of neutrophil infiltration and activation of the inflammatory response. Pretreatment of animals with L-DEX was significantly more effective than pretreatment with the free drug in reducing lung inflammation and other lung injuries, as indicated by the appropriate injury markers used in this study. Our results suggested that the pulmonary delivery of liposome-entrapped anti-inflammatory drugs such as dexamethasone improves prophylactic efficacy in counteracting LPS-induced lung injury.     

Maresin 1 mitigates LPS-induced acute lung injury in mice

BACKGROUND AND PURPOSE

Acute lung injury (ALI) is a severe illness with a high rate of mortality. Maresin 1 (MaR1) was recently reported to regulate inflammatory responses. We used a LPS-induced ALI model to determine whether MaR1 can mitigate lung injury.

EXPERIMENTAL APPROACH

Male BALB/c mice were injected, intratracheally, with either LPS (3 mg·kg⁻¹) or normal saline (1.5 mL·kg⁻¹). After this, normal saline, a low dose of MaR1 (0.1 ng per mouse) or a high dose of MaR1 (1 ng per mouse) was given i.v. Lung injury was evaluated by detecting arterial blood gas, pathohistological examination, pulmonary oedema, inflammatory cell infiltration, inflammatory cytokines in the bronchoalveolar lavage fluid and neutrophil–platelet interactions.

KEY RESULTS

The high dose of MaR1 significantly inhibited LPS-induced ALI by restoring oxygenation, attenuating pulmonary oedema and mitigating pathohistological changes. A combination of elisa and immunohistochemistry showed that high-dose MaR1 attenuated LPS-induced increases in pro-inflammatory cytokines (TNF-α, IL-1β and IL-6), chemokines [keratinocyte chemokine, monocyte chemoattractant protein-5, macrophage inflammatory protein (MIP)-1α and MIP-1γ], pulmonary myeloperoxidase activity and neutrophil infiltration in the lung tissues. Consistent with these observations, flow cytometry and Western blotting indicated that MaR1 down-regulated LPS-induced neutrophil adhesions and suppressed the expression of intercellular adhesion molecule (ICAM)-1, P-selection and CD24.

CONCLUSIONS AND IMPLICATIONS

High-dose MaR1 mitigated LPS-induced lung injury in mice by inhibiting neutrophil adhesions and decreasing the levels of pro-inflammatory cytokines.     

麦角甾醇对LPS诱导的肺损伤小鼠的抗炎作用研究

目的研究麦角甾醇对LPS诱导的小鼠急性肺损伤的抗炎作用研究。方法取50只雄性BABL/c小鼠随机分为5组:空白对照组、模型组、地塞米松组(2 mg/kg)、麦角甾醇低剂量组(20 mg/kg)、麦角甾醇高剂量组(40 mg/kg)。空白对照组和模型组按体积给予生理盐水,地塞米松组(2 mg/kg)、麦角甾醇组(20、40mg/kg)灌胃给予相应药物。给药1 h后,除空白对照组,其余各组小鼠气管滴注20μg LPS。检测小鼠肺干湿重比(W/D),肺泡灌洗液(BALF)中超氧化物歧化酶(SOD)水平、丙二醛(MDA)含量,血清与肺泡灌洗液炎性细胞因子(TNF-α、IL-1β、IL-6)水平。取各组小鼠肺组织做HE染色,并检测肺组织Rho、ROCK1、ROCK2、p-NF-κBP65、NF-κBP65、p-IκBα、IκBα蛋白表达。结果麦角甾醇20、40 mg/kg能显著提升LPS诱导的急性肺损伤小鼠血清SOD水平,降低MDA含量;改善血清及肺泡灌洗液炎症因子水平和肺组织病理学改变;降低肺组织Rho、ROCK1、ROCK2、p-NF-κBP65、p-IκBα蛋白表达。结论麦角甾醇对LPS诱导的急性肺损伤小鼠有保护作用,其作用可能与Rho/ROCK/NF-κB信号通路有关。     

Invasive and noninvasive lung function measurements in rodents

Precise and repeatable measurements of pulmonary function in intact mice or rats are becoming increasingly important for experimental investigations on various respiratory disorders like asthma and for pharmacological, safety-pharmacological or toxicological testing of drugs or chemicals. This review provides a short overview of typical in-vivo measurement techniques, discusses their advantages and disadvantages and presents two of these methods in detail: the noninvasive head-out body plethysmography and an invasive but repeatable body-plethysmography in orotracheally intubated rodents. It will be demonstrated that these methods are able to monitor bronchoconstriction in safety-pharmacological tests or in asthma models showing early allergic response or late airway hyperresponsiveness in response to inhaled allergens and demonstrate drug effects on pulmonary endpoints. The changes in the respective parameters such as tidal midexpiratory flow (EF(50)) or lung resistance in typical bronchoconstriction models have been measured in the same animals and compared for validation purposes. It is concluded that both invasive and noninvasive pulmonary function tests are capable of detecting allergen-specific as well as non-allergic bronchoconstriction in intact mice or rats. The invasive determination of resistance is superior in sensitivity, whereas the noninvasive EF(50) method is particularly appropriate for quick and repeatable screening of respiratory function in large numbers of mice and rats or if the conscious animal has to be tested (e.g. safety pharmacology). The use of both techniques in a large number of studies in the last years have demonstrated that they provide useful and necessary information on pulmonary mechanics in studies of respiratory disorders including experimental models of asthma, in investigations of pulmonary pharmacology, safety pharmacology and toxicology in mice and rats.     

Antiinflammatory effects of matrine in LPS-induced acute lung injury in mice

Matrine is one of the main active components of Chinese herb Sophora flavescens Ait (Kushen), which has been demonstrated to be effective in suppressing inflammation. The aim of the present study is to investigate the effect of matrine on LPS-induced lung injury. Lung injury was assessed by histological study and wet to dry weight ratios, as well as cell count and protein content in bronchoalveolar lavage fluid. We also detected MPO activity reflecting neutrophil infiltration and MDA activity examining oxidative stress in lung tissues. Cytokines and ROS production in cells were monitored by ELISA and flow cytometry, respectively. The results showed that high dose of matrine significantly reduced the mortality rate of mice with LPS administration. Treatment with matrine improved LPS-induced lung histopathologic changes, alleviated pulmonary edema and lung vascular leak, inhibited MPO and MDA activity,and reduced the production of inflammatory mediators including TNF-α, IL-6 and HMGB1. In vitro, matrine administration reduced the production of ROS and inflammatory factors, which was possibly associated with inhibition of NF-κB. In conclusion, the current study demonstrated that matrine exhibited a protective effect on LPS-induced acute lung injury by inhibiting of the inflammatory response, which may involve the suppression of ROS and tissue oxidative stress.     

Memantine protects against amphetamine derivatives-induced neurotoxic damage in rodents

We hypothesize that 3,4-methylenedioxymethamphetamine (MDMA) and methamphetamine (METH) interact with alpha-7 nicotinic receptors (nAChR). Here we examine whether memantine (MEM), an antagonist of NMDAR and alpha-7 nAChR, prevents MDMA and METH neurotoxicity. MEM prevented both serotonergic injury induced by MDMA in rat and dopaminergic lesion by METH in mice. MEM has a better protective effect in front of MDMA- and METH-induced neurotoxicity than methyllycaconitine (MLA), a specific alpha-7 nAChR antagonist. The double antagonism that MEM exerts on NMDA receptor and on alpha-7 nAChR, probably contributes to its effectiveness. MEM inhibited reactive oxygen species production induced by MDMA or METH in synaptosomes. This effect was not modified by NMDA receptor antagonists, but reversed by alpha-7 nAChR agonist (PNU 282987), demonstrating a preventive effect of MEM as a result of it blocking alpha-7 nAChR. In synaptosomes, MDMA decreased 5-HT uptake by about 40%. This decrease was prevented by MEM and by MLA but enhanced by PNU 282987. A similar pattern was observed when we measured the dopamine transport inhibited by METH. The inhibition of both transporters by amphetamine derivatives seems to be regulated by the calcium incorporation after activation of alpha-7 nAChR. MDMA competitively displaces [(3)H]MLA from rat brain membranes. MEM and METH also displace [(3)H]MLA with non-competitive displacement profiles that fit a two-site model. We conclude that MEM prevents MDMA and METH effects in rodents. MEM may offer neuroprotection against neurotoxicity induced by MDMA and METH by preventing the deleterious effects of these amphetamine derivatives on their respective transporters.     

Tacrolimus (FK506) has protective actions against murine bleomycin-induced acute lung injuries

The effects of tacrolimus on murine acute lung injury were tested, especially in comparison to dexamethasone. Acute lung injury was induced by intratracheal instillation of bleomycin. Oral tacrolimus significantly improved survival rates of bleomycin-exposed mice, while cyclosporin A or dexamethasone did not. After instillation of bleomycin (day 0), a migration of neutrophils into alveolar spaces peaked on day 3, with concomitant increases of chemokines. On day 6, marked morphological changes in the lungs were observed. All these changes were significantly inhibited by tacrolimus. Furthermore, DNA ladder and immunohistochemical analyses of lungs showed that apoptosis of lung cells appeared on day 6 and was abolished only by the treatment of tacrolimus. These results suggest that both anti-inflammatory and anti-apoptotic action of tacrolimus contribute to improvement of bleomycin-induced acute lung injury.     

血管生成素2在大鼠内毒性急性肺损伤中的作用与机制研究

目的 探讨血管生成素-2(Ang-2)在脂多糖(LPS)致大鼠急性肺损伤(ALI)时的表达及其机制。方法 48只清洁级SD大鼠随机分为正常对照组、1 mg/kg LPS组、5 mg/kg LPS组和10 mg/kg LPS组,每组12只。LPS组尾静脉注射不同剂量LPS复制ALI模型,对照组注射同等体积生理盐水,留取肺组织标本,观察肺湿/干重(W/D)比值、HE染色光镜观察肺组织标本病理改变并进行肺损伤评分,各组ELISA法检测血浆中Ang-2与血管内皮生长因子(VEGF)的表达,Westernblot方法检测肺组织中Ang-2的蛋白表达情况。结果 LPS注射进入大鼠尾静脉6 h后,光镜下可见肺组织内的炎性细胞浸润,肺泡隔增宽,肺间质水肿和肺结构破坏等病理改变;LPS各组的肺损伤评分与W/D比值明显高于对照组(P<0.05);LPS不同剂量组血浆中Ang-2与VEGF的表达水平较对照组明显增高(P<0.05),血浆中Ang-2的表达与VEGF、肺损伤评分呈正相关(r=0.826,P<0.05;r=0.775,P<0.05);LPS不同剂量组与Ang-2蛋白的表达水平呈现剂量效应关系(P<0.05)。结论 Ang-2参与大鼠ALI的发病过程,且Ang-2水平增高与ALI严重程度有关。     

Monoammonium glycyrrhizinate inhibited the inflammation of LPS-induced acute lung injury in mice

Monoammonium glycyrrhizinate (MAG) was the aglycone of glycyrrhizin derived from licorice. In this study, the anti-inflammatory effects of MAG on lipopolysaccharide (LPS)-induced acute lung injury (ALI) in mice and the possible mechanisms involved in this protection were investigated. Pretreatment with MAG prior to the administration of intratracheal LPS significantly induced a decrease in lung wet weight/dry weight ratio, in total leukocyte number and neutrophil percent in the BALF, and in myeloperoxidase (MPO) activity of lung in dose-dependent manners. At the same time, pretreatment with MAG also significantly improved the super oxide dismutase (SOD) activity and induced the malondialdehyde (MDA) content in the bronchoalveolar lavage fluid (BALF). Importantly, pretreatment with MAG prevented an increase in cyclic adenosine monophosphate-phosphodiesterase (cAMP-PDE) activity of lung in a dose-dependent manner. In addition, it can up-regulate the interleukin-10 (IL-10) level and down-regulate the tumor neurosis factor-α (TNF-α) level in the lung tissue of ALI mice. These results showed that anti-inflammatory effects of MAG against the LPS-induced ALI may be due to its ability of primary inhibition of cAMP-PDE activity, oxidative stress and its regulation of cytokine effects. Thus the results support that use of MAG is beneficial in the treatment of ALI and ARDS.     

褪黑素对GalN/LPS引起小鼠急性肝损伤的保护作用

目的研究褪黑素(MT)对氨基半乳糖(D-GalN)与细菌脂多糖(LPS)共处理引起小鼠急性肝损伤的保护作用。方法建立GalN/LPS引起的小鼠急性肝脏损伤模型。于GalN/LPS共处理前30min和处理后1h、2h分别经腹腔注射给予MT,经GalN/LPS共处理8h后剖杀动物,取血和肝脏,检测血清丙氨酸氨基转移酶(ALT)活力、肿瘤坏死因子α(TNF-α)和一氧化氮(NO)水平,测定肝脏组织Caspase-3活性、还原性谷胱甘肽(GSH)含量、谷胱甘肽还原酶(GSH-RD)和谷胱甘肽过氧化物酶(GSH-PX)活性,采用DNA梯度分析实验检测肝脏凋亡,并对小鼠部分肝脏进行病理组织学检查。结果与模型组比较,MT处理组小鼠血清ALT活力和TNF-α含量明显下降,肝脏Caspase-3活性、GSH损耗明显降低,肝组织GSH-RD和GSH-PX活性明显升高,DNA凋亡条带较前有所减弱,而MT对体内NO生成无明显影响。结论MT对GalN/LPS引起小鼠急性肝损伤有保护作用,主要通过其抗炎、抗氧化和抗凋亡作用。     

Assessment of early acute lung injury in rodents exposed to phosgene

Phosgene is a highly reactive oxidant gas used in the chemical industry. Phosgene can cause life-threatening pulmonary edema by reacting with peripheral lung compartment tissue components. Clinical evidence of edema is not usually apparent until well after the initial exposure. This study was designed to investigate early signs of acute lung injury in rodents within 45–60 min after the start of exposure. Male mice, rats, or guinea pigs were exposed to 87 mg/m³ (22 ppm) phosgene or filtered room air for 20 min followed by room air washout for 5 min. This concentration-time exposure causes a doubling of lung wet weight within 5 h. After exposure, animals were immediately anesthetized i.p., with pentobarbital. Bronchoalveolar lavage (BAL) was performed and fluid analyzed for total glutathione (GSH), lipid peroxidation thiobarbituric acid reactive substances (TBARS), and protein concentration. Lungs were perfused with saline to remove blood, freeze-snapped in liquid N₂, analyzed for tissue GSH, and TBARS. Lung edema was assessed gravimetrically by measuring tissue wet/dry (W/D) weight ratios and tissue wet weights (TWW). W/D and TWW were significantly higher in mice for phosgene vs air (P=0.001, P<0.0001, respectively), but not in rats or guinea pigs. Tissue TBARS was significantly higher in phosgene-exposed guinea pigs, P=0.027; however, BAL TBARS was higher in both rats and guinea pigs, P=0.013 and P=0.006, respectively. Tissue GSH was significantly lower in phosgene-exposed rats and guinea pigs but not mice, whereas BAL GSH was higher in rats, P<0.0001. There were significantly higher BAL protein levels in all phosgene-exposed species: mice, P<0.0001; rats, P<0.0001; and guinea pigs, P=0.002. Although there appears to be a species-specific biochemical effect of phosgene exposure for some biochemical indices, measurement of BAL protein in all three species is a better indicator of ensuing edema formation. Received: 30 June 1997 / Accepted: 5 January 1998     

Activity of Brucea javanica oil emulsion against gastric ulcers in rodents

The present study aims to investigate the gastroprotective effect of Brucea javanica oil emulsion (BJOE) in animals. Gastroprotective potential of BJOE was studied on absolute ethanol, aspirin, reserpine and restraint plus water immersion-induced gastric ulcers in mice as well as glacial acetic acid (GAA) and pyloric ligation (PL)-induced gastric ulcers in rats. Except for ulcer scores, total acidity as well as pepsin activity as for the PL-induced gastric ulcer model and ulcer incidence as for the GAA-induced gastric ulcer model were also determined. Histopathological evaluation as for aspirin, reserpine, PL-induced models was conducted. Results showed that BJOE significantly (P < 0.05) reduced ulcer index in the mouse and rat models in a dose-dependent manner. It had significant (P < 0.05) suppressive effect on total activity of gastric juice as well in PL-induced model. Histopathological examination for the stomach samples confirmed the findings in the aspirin, reserpine or PL-induced gastric lesion models, which showed relatively complete mucosa structure and less inflammation. It is concluded that BJOE could be effective on gastric ulcer in rodents and its gastroprotective activity might be related to antioxidant, anti-inflammatory ability and promote gastric mucus secreted. The results may provide beneficial basis for increasing BJOE's clinical indication in future.     

p38MAPK对内毒素致大鼠急性肺损伤的保护

目的 研究p38丝裂原活化蛋白激酶(p38MAPK)在内毒素引起急性肺损伤中的作用.方法 60只SD大鼠随机分生理盐水(NS)组、内毒素(LPS)组、SB203580+LPS(SB+LPS)组和SB203580+NS(SB+NS)组.ELISA法检测不同时间点大鼠支气管肺泡灌洗液(BALF)中肿瘤坏死因子(TNF)-α和白细胞介素(IL)-6浓度,HE染色检测肺组织病理学变化,Western blot法检测肺组织中磷酸化p38MAPK、核因子-kB(NF-kB)、p65和NF-kB抑制蛋白(IkBa)的表达.结果 LPS组大鼠BALF中TNF-α、IL-6的浓度明显升高(P＜0.05),肺组织破坏明显.磷酸化p38MAPK及胞核中NF-αB 065表达显著增多,胞浆中IkBa表达显著减少.SB+LPS组肺组织损伤程度轻,BALF中TNF-α、IL-6的释放显著受抑(P＜0.01),肺组织NF-kB活化及胞浆中IkBα鼬的降解均明显受抑(P＜0.01).结论 p38MAPK在LPS诱导的急性肺损伤中发挥重要作用,p38MAPK可能参与NF-kB的活化过程.     

姜黄素类似物JZ02对LPS诱导的急性肺损伤的影响

目的探讨姜黄素类似物JZ02对细菌毒素诱导的大鼠急性肺损伤的药理活性。方法 18只SPF级SD大鼠随机分为对照组(CON组)、模型组(LPS组)和JZ02治疗组(JZ02+LPS组),每组6只。连续7 d灌胃JZ02 20 mg/kg或等剂量0.5%CMC-Na,气管滴注5 mg/kg LPS或等量生理盐水建立急性肺损伤(ALI)模型,24 h后收取肺组织及肺泡灌洗液,检测肺湿干重比值(Wet/Dry)、肺泡灌洗液中蛋白浓度、细胞计数及炎症介质TNF-α等,并做肺组织切片,观察肺损伤及炎症细胞浸润情况。结果姜黄素类似物JZ02可有效抑制LPS导致的肺含水量及肺泡灌洗液中蛋白、炎性细胞、炎症因子的增加,缓解肺组织细胞肺泡间隔增厚,间质充血、水肿及炎症细胞浸润等。结论姜黄素类似物JZ02能够抑制LPS诱导的炎症反应,减轻肺损伤。