L－精氨酸对兔脑缺血脑水肿的影响

Ｌ－精氨酸对兔脑缺血脑水肿的影响田恒力，张天锡，赵卫国在建立兔大脑中动脉阻断（ＭＣＡＯ）局灶脑缺血模型基础上，应用一氧化氮（ＮＯ）合成底物：Ｌ－精氨酸、ＮＯＳ抑制剂：Ｌ－ＮＮＡ（Ｎ￣Ｇ－Ｎｉｔｒｏ－Ｌ－Ａｒｇｉｎｉｎｅ）及不能合成ＮＯ的Ｄ－精氨酸等，...     

肾脏疾病和NO

在肾脏ＮＯ（一氧化氮）由内皮细胞和致密斑产生。它具有调节肾小球血流动态及肾小管功能的重要作用。ＮＯ的病态生理与某些肾脏疾病有关。ＮＯ由Ｌ－Ａｒｇ（左旋精氨酸）在ＮＯＳ（一氧化氮合成酶）的作用下生成。在肾脏，ＮＯＳ除血管内皮细胞外，在致密斑有ｎＮＯＳ（...     

L-精氨酸加快呼吸道纤毛运动频率的机制

目的 了解ＮＯ信号传递系统对呼吸道纤毛运动的作用机制。方法 用ＮＯ前体Ｌ－精氨酸（Ｌ－Ａｒｇ）作用于培养大鼠呼吸道纤毛上皮,并分别将纤毛组织预孵于一氧化氮合酶（ＮＯＳ）抑制剂Ｌ－ＮＭＭＡ,可溶性岛苷酸环化酶（ｓＧＣ）拮抗剂ＯＤＱ及选择性ｃＧＭＰ依赖的蛋白酶（ＰＫＧ）拮抗剂Ｒｐ－８－Ｂｒ－ｃＧＭＰＳ后,再施以Ｌ－Ａｒｇ。以相差显微镜及成像分析技术测定纤毛运动频率（ＣＢＦ）。结果 Ｌ－Ａｒｇ可使ＣＢＦ     

内源性一氧化氮与输胶体液过荷引起肺水肿关系的实验研究

目的：建立输胶体液过荷引起的肺水肿模型后，用ＮＯ合成酶抑制剂Ｎ－硝基－Ｌ－精氨酸（Ｌ－ＮＮＡ）和大剂量ＮＯ的生理性前体Ｌ－精氨酸，研究内源性ＮＯ与肺水的关系及对血液动力学和动脉血气的影响。     

一氧化氮在门静脉高压症高动力循环中作用的实验研究

目的研究一氧化氮（ＮＯ）在门静脉高压症高血流动力学中的作用。方法用ＳＤ大鼠制备肝内型（ＩＨＰＨ）、肝前型门静脉高压（ＰＨＰＨ）和门腔分流（ＰＣＳ）三组模型,并以正常鼠作为对照组。每一组实验动物再分成三个亚组：ＮＯ生物合成抑制剂左旋单甲基精氨酸（Ｌ－ＮＭＭＡ）组、Ｌ－ＮＭＭＡ加ＮＯ生物合成底物Ｌ－精氨酸组以及生理盐水安慰组。血流动力学研究用放射性微球注射技术。结果ＩＨＰＨ、ＰＨＰＨ和ＰＣＳ鼠均具有心输出量和内脏血流量增加,平均动脉压、周围血管总阻力和内脏血管阻力降低等高血流动力学特征。Ｌ－ＮＭＭＡ能逆转门静脉高压鼠和门腔分流鼠的高血流动力学状态,使之恢复至正常鼠的基础水平,但并未达到正常鼠用Ｌ－ＮＭＭＡ后的水平。如先给予Ｌ－精氨酸,则使Ｌ－ＮＭＭＡ对门静脉高压鼠和门腔分流鼠的心血管作用消失。结论门静脉高压症中ＮＯ过多产生是高动力循环重要的、但并不是唯一的介质。     

左旋精氨酸对急性胰腺炎的作用

探讨左旋精氨酸（Ｌ－Ａｒｇ）在大鼠急性水肿性胰腺炎（ＡＥＰ）中的作用。方法观察倍数剂量Ｌ－Ａｒｇ治疗ＡＥＰ大鼠后,血浆和胰组织一氧化氮（ＮＯ）浓度、血浆淀粉酶、平均动脉压（ＭＡＰ）、胰组织病理的变化。结果ＡＥＰ大鼠血浆、胰组织ＮＯ浓度明显降低,Ｌ－Ａｒｇ５０、１００ｍｇ／ｋｇ升高血浆、胰组织ＮＯ浓度,改善了大鼠ＡＥＰ;Ｌ－Ａｒｇ８００、１６００ｍｇ／ｋｇ体重使ＮＯ浓度过度升高,加重ＡＥＰ成为急性出血坏死性胰腺炎（ＡＨＮＰ）;胰组织病理评分与血浆、胰组织ＮＯ浓度呈正相关。Ｌ－Ａｒｇ对ＭＡＰ的影响较小。血浆淀粉酶除８００ｍｇ／ｋｇ体重组明显降低外,其余各组间无明显差异。结论Ｌ－Ａｒｇ因升高ＮＯ浓度而参与了大鼠ＡＥＰ的病理过程。     

N-单甲基左旋精氨酸对脾切除后大鼠内毒素休克的治疗作用

通过观察脾切除术后大鼠内毒素休克时血压及血浆一氧化氮（ＮＯ）代谢产物的变化，以评价ＮＯ在无脾动物凶险性感染发病中作用及一氧化氮合成酶（ＮＯＳ）抑制剂Ｎ－单甲基左旋精氨酸（Ｌ－ＮＭ－ＭＡ）的治疗效果。Ｗｉｓｔａｒ大鼠脾切除或假手术术后两周，静脉注射内毒素，动态监测血压及血浆亚硝酸盐／硝酸盐浓度，并记录动物死亡率。结果显示：内毒素攻击后大鼠平均动脉压有不同程度下降，ＮＯ水平明显升高，其中无脾动物血压呈进行性降低，程度更重，持续时间更长，血浆ＮＯ代谢产物亚硝酸盐升高更著；应用Ｌ－ＮＭＭＡ后，血压明显回升，死亡率降低。提示：无脾动物对内毒素更敏感，左旋精氨酸：一氧化氮（Ｌ－ａｒｇ：ＮＯ）通路活性在无脾动物明显增高，这可能与革兰氏阴性细菌诱发的脾切除术后凶险性感染（ＯＰＳＩ）发生有关。Ｌ－ＮＭＭＡ对稳定ＯＰＳＩ早期循环状态，改善组织血流灌注可能有益     

一氧化氮与大鼠缺血性急性肾衰竭关系的实验研究

目的 研究一氧化氮（ＮＯ）在缺血性急性肾衰竭病理过程中的作用。方法 通过夹闭大鼠双侧肾蒂４５分钟后再松夹复制出急性肾衰（ＡＲＦ）模型,各组在松夹后分别静滴生理盐水,Ｌ－精氨酸,Ｄ－精氨酸,Ｎ－硝基－Ｌ－精氨酸（ＮＬＡ）。结果 与盐水对照组相比,Ｌ－精氨酸组菊糖清除率和再灌注早期的尿流率增高（Ｐ〈０．０５）,尿钠排泄分数下降（Ｐ〈０．０５）,肾病理损害也较轻（Ｐ〈０．０５）,ＮＬＡ虽升高血压（Ｐ〈０     

一氧化氮在急性缺血性肾衰中作用的实验研究

采用左肾动脉夹闭６０分钟再灌注致缺血性肾衰模型，观察再灌注后肾脏皮质、外髓、内髓中ＮＯ（ＮＯ稳定代谢产物）的动态变化；再灌注后加用ＮＯ底物（Ｌ－精氨酸）或ＮＯ生成抑制剂（Ｌ－ＮＮＡ）对肾脏ＮＯ生成及肾功能的影响。结果表明：再灌注后肾组织ＮＯ含量显著下降，再灌注２４小时无明显恢复。使用Ｌ－ＮＮＡ可进一步减少ＮＯ２生成，加重肾功能损害；Ｌ－精氨酸对肾脏ＮＯ２生成和肾功能均无显著改善。结果提示：再灌注后ＮＯ的生成减少，ＮＯ的生成抑制源于肾脏ＮＯ生成能力的损害，ＮＯ的减少可加重肾功能损害。     

一氧化氮及其合酶在心肌缺血再灌注损伤中作用的研究

目的：用鼠的离体工作心脏研究心肌缺血再灌注损伤一氧化氮（ＮＯ）、ＮＯ合酶（ＮＯＳ）的作用。方法：ＲＴ－ＰＣＲ定量检测心肌组织结构型ＮＯＳ（ｃＮＯＳ）的ｍＲＮＡ表达,测定心肌组织的ｃＮＯＳ、诱导型ＮＯＳ（ｉＮＯＳ）及冠状动脉动脉冠脉）流出液的ＮＯ,同时检测心脏缺血再灌注前后的心功能变化。并分别于次序停跳液中加用缓激肽（ＢＫ）、Ｌ－精氨酸及ＢＫ加Ｌ－精氨酸,观察其对心肌缺血再灌注损伤的影响。结果：心肌     

氯化镧对内毒素/脂多糖诱导巨噬细胞株一氧化氮合酶表达的抑制作用

目的了解氯化镧（LaCl3）对内毒素／脂多糖（LPS）刺激的巨噬细胞诱导型一氧化氮合酶（iNOS）表达的影响，并探讨其机制。方法将小鼠巨噬细胞株RAW264．7分为空白对照组、LaCl、组、LPS组和LaCl3＋LPS组。前3组细胞分别用常规培养液、含2．50μmol／L LaCl3的培养液、含1mg／L LPS的培养液培养24h，LaCl3＋LPS组用含2．5μmol／LLaCl，的培养液培养24h后，换为含1mg／L LPS的培养液培养24h。采用免疫细胞化学染色法检测iNOS在各组细胞中的表达强度；蛋白质印迹法检测iNOS的蛋白表达水平；反转录一PCR测定iNOS的mRNA表达水平；硝酸还原酶法测定各组细胞培养上清液中一氧化氮（NO）含量。结果免疫细胞化学染色结果显示，iNOS主要分布于各组细胞的胞质中，空白对照组和LaCl3组荧光强度极弱；LPS组荧光强度最强，阳性细胞百分率为44．4％，明显高于LaCl3＋LPS组（11．8％，P〈0．05）。LPS组iNOS蛋白及其mRNA表达量和细胞培养上清液中NO含量均高于其余各组（P〈0．05）。结论LaCl3可在mRNA水平和蛋白水平抑制LPS诱导的iNOS过度表达，减少NO生成，提示LaCl3能拮抗LPS诱导的iNOS过度活化。     

Inhibition of inducible nitric oxide synthase limits nitric oxide production and experimental aneurysm expansion

PURPOSE: Nitric oxide (NO), frequently cited for its protective role, can also generate toxic metabolites known to degrade elastin. Both abdominal aortic aneurysms (AAAs) and inducible nitric oxide synthase (iNOS) are associated with inflammatory states, yet the relationship between NO production by iNOS and AAA development is unknown. The current study examines iNOS expression, NO production, and the effects of selective inhibition of iNOS by aminoguanidine in experimental AAA. METHODS: An intra-aortic elastase infusion model was used. Control rats received intra-aortic saline infusion and postoperative intraperitoneal saline injections (Group 1). In the remaining groups, intra-aortic elastase infusion was used to induce aneurysm formation. These rats were treated with intraperitoneal injections of saline postoperatively (Group 2), aminoguanidine postoperatively (Group 3), or aminoguanidine preoperatively and postoperatively (Group 4). Aortic diameter and plasma nitrite/nitrate levels were measured on the day of surgery and postoperative day 7. Aortas were harvested for biochemical and histologic analysis on postoperative day 7. RESULTS: Infusion of elastase produced AAAs (P <.001) with significant production of iNOS (P <.05) and nitrite/nitrate (P <.003) compared with controls. Selective inhibition of iNOS with aminoguanidine in elastase-infused aortas significantly reduced aneurysm size (P <.01) compared with elastase infusion alone. Aminoguanidine-treated rats displayed suppression of iNOS expression and plasma nitrite/nitrate production not significantly different from the control group. Histologic evaluation revealed equivalent inflammatory infiltrates in elastase-infused groups. CONCLUSION: Expression of iNOS is induced and plasma nitrite/nitrate levels are increased in experimental AAA. Inhibition of iNOS limits NO production and iNOS expression, resulting in smaller aneurysm size. NO production by iNOS plays an important role with detrimental effects during experimental aneurysm development.     

Expression of TGF-betas and their receptors is differentially modulated by reactive oxygen species and nitric oxide in human articular chondrocytes

OBJECTIVES: To study the effects exerted by two antioxidants, N-monomethyl-L-arginine (L-NMMA), as an inhibitor of nitric oxide (NO) synthesis, and N-acetylcysteine (NAC), a reactive oxygen species (ROS) scavenger, on the expression of the major growth factor involved in cartilage repair, TGF-beta, under the three isoforms beta1, beta2 and beta3, and the receptors I and II of this factor, using lipopolysaccharide (LPS)-treated human chondrocytes in culture. METHODS: Suspension cultures of human chondrocytes derived from the knee of osteoarthritic patients were treated for 48 h with lipopolysaccharide (LPS) (10 microg/ml), L-NMMA (0.5 mM) or NAC (1 mM). Nitrite levels were assayed on the culture media using the Griess spectrophotometric method. After total RNA extraction, the expression of inducible NO synthase (iNOS), TGF-beta1, TGF-beta2, TGF-beta3, TGF-beta receptors I and II, was determined by semi-quantitative polymerase chain-reaction (RT-PCR). RESULTS: LPS induced a dramatic increase of both NO production and iNOS mRNA level. The addition of L-NMMA (0.5 mM) abolished NO production without affecting iNOS mRNA levels. In contrast NAC (1 mM) strongly synergized with LPS to stimulate NO synthesis. LPS treatment did not significantly alter TGF-beta1 expression whereas L-NMMA inhibited its production. TGF-beta2 mRNA level was decreased by LPS and was not changed in the presence of L-NMMA. On the other hand, NAC was capable of counteracting the LPS-induced inhibition of TGF-beta2 expression. TGFbeta3 mRNA level was markedly reduced by LPS alone, or with both L-NMMA and NAC. Finally, the expression of TGF-betaRI was slightly increased in the presence of combined LPS and L-NMMA or NAC whereas that of TGFbeta-RII was reduced in the same conditions. CONCLUSIONS: The modulation of TGF-beta system was found to be differentially controlled by NO and ROS productions. Indeed, the control exerted on TGF-beta expression varied according to the isoform: TGF-beta1 mRNA level depends on NO whereas that of TGF-beta2 is regulated by ROS and TGF-beta3 seems to be unaffected by both of them. The expression of TGF-beta receptors appeared to be modulated by NO and ROS levels. The relevance of the present findings to osteoarthritis (OA) physiopathology and the potential use of antioxidant therapy to treat this disease are discussed.     

L-精氨酸和氨基胍在大鼠肺移植缺血再灌注损伤中的作用

目的 观察L-精氨酸(L-Arg)和氨基胍对大鼠肺移植后缺血再灌注的保护作用.方法 建立大鼠左单肺移植模型,术后随机分为A组(对照组,腹腔注射生理盐水),B组(腹腔注射L-Arg)、C组(腹腔注射氨基胍)和D组(腹腔注射L-Arg和氨基胍),每组6只.移植肺再灌注2 h后,检测肺组织髓过氧化物酶(MPO)、丙二醛(MDA)含量、超氧化物歧化酶(SOD)活力、内皮型一氧化氮合酶(eNOS)和诱导型一氧化氮合酶(iNOS)活性并测定移植肺干湿重比(W/D)及静脉血中一氧化氮(NO)含量,观察移植肺的病理学形态.结果 再灌注2 h后,B组移植肺的W/D(5.10±0.21)、MPO(1.74±0.26)U/g和MDA(20.87±2.90)μmol/g均低于A组W/D(5.74 ±0.14)、MPO(2.36±0.32)U/g和MDA(31.33 ±3.46)μmol/g;SOD活性(424.29±27.86)U/mgprot、NO含量(175.12 ±17.40)μmol/L、iNOS活性(3.62 ±0.26)U/mgprot和eNOS活性(5.36±0.28)U/mgprot均较A组SOD活性(268.01±26.06)U/mgpro、NO含量(98.29±6.95)μmol/L、iNOS活性(2.53 ±0.22)U/mgprot和eNOS活性(3.57 ±0.40)U/mgprot高(P＜0.05).C组的NO含量(84.13±5.18)μmol/L、iNOS活性(1.81 ±0.09)U/mgprot均较A组低(P＜0.05).D组的W/D(4.79 ±0.19)、MPO(1.24±0.13)U/g、MDA(14.60±4.14)μmol/g、iNOS活性(1.99±0.17)U/mgprot低于A组,SOD活性(493.75±24.95)、NO含量(149.61±10.70)μmol/L、eNOS活性(5.50±0.27)U/mgprot高于A组(P＜0.05).与B组比较,D组的W/D、MPO、MDA、NO含量、iNOS活性降低,SOD升高(P＜0.05).病理形态学检查显示D组炎细胞浸润及渗出最轻,B组次之,A组和C组最差.结论 移植后再灌注早期应用L-Arg可减轻缺血再灌注损伤,应用氨基胍并不能减轻移植肺的损伤,但联合应用L-Arg和氨基胍优于单纯应用L-Arg.

Abstract：

Objective To investigate the effects of L-arginine (L-Arg) and aminoguanidine on ischemia-reperfusion injury following rat lung transplantation. Methods The models of rats lung transplantation were established and 4 groups ( n = 6 each) were randomly set up: group A ( normal control group)and treated groups B, C and D. In these groups, different medicines (NS, group A; L-Arg, group B;aminoguanidine, group C; L-Arg and aminoguanidine, group D) were intraperitoneally administered to the recipient rats before reperfusion. After reperfusion for 2 h, the lung graft was harvested for measurements of lung wet/dry ratio ( W/D ) , myeloperoxidase ( MPO ) , malondialdehyde ( MDA ) , superoxide dismutase (SOD) , endothelial nitric oxide synthase (eNOS) , inducible nitric oxide synthase (iNOS). The contents of plasma nitric oxide (NO) were determined. The pathological changes in the lung grafts were observed.Results After reperfusion for 2 h, W/D (5. 10 ±0.21), MPO (1.74 ±0.26) U/g, MDA (20.87 ±2. 90) μmol/g in group B were significantly lower [W/D (5. 74 ± 0. 14), MPO (2. 36 ± 0. 32) U/g,MDA (31. 33 ±3.46) μmol/g] (P ＜ 0. 05), and the levels of SOD (424. 29 ± 27. 86) U/mg protein,NO (175. 12 ± 17. 40) μmol/L, iNOS (3. 62 ±0. 26) U/mg protein and eNOS (5. 36 ±0. 28) U/mg protein were significantly higher than in group A [SOD (268.01 ±26.06) U/mg protein, NO (98.29 ±6.95) μmol/L, iNOS (2.53 ±0.22) U/mg protein and eNOS (3. 57 ±0.40) U/mg protein] (P＜0. 05). The contents of NO (84. 13 ±5. 18) μmol/L and iNOS (1. 81 ±0. 09) U/mg protein in group C were significantly lower than in group A (P ＜ 0. 05). W/D (4. 79 ± 0. 19) , MPO (1. 24 ± 0. 13 ) U/g,MDA (14. 60 ±4. 14) μmol/g, iNOS (1. 99 ±0. 17) U/mg protein were significantly lower than in group A (P ＜0. 05) , and SOD (493. 75 ±24. 95) , NO (149. 61 ± 10. 70) μmol/L and eNOS (5. 50 ±0. 27)U/mg protein in group D were significantly higher than in group A (P＜0. 05). W/D, MPO, MDA, NO and iNOS in group D were significantly reduced as compared with group B (P ＜ 0. 05 ) , and SOD was significantly increased in group B ( P ＜ 0. 05 ) . The pathological examination revealed that the inflammatory cell infiltration in group D was the mildest, followed by groups B, A and C. Conclusion The L-Arg could alleviate the lung ischemia-reperfusion injury after transplantation, the combined used of L-Arg and aminoguanidine could obtain better effects than L-Arg used alone. The aminoguanidine used alone could not alleviate ischemia-reperfusion injury after transplantation.     

内毒素休克大鼠核因子κB活化规律及其在生物蝶呤诱生中的作用

目的观察内毒素休克大鼠血浆及主要脏器核因子(NF)κB活化规律及其对生物蝶呤(BH4)和一氧化氮(NO)表达水平的影响,探讨内毒素休克时NF-κB信号通路对BH4诱生NO的分子调控机制及其与多器官功能损害的关系。方法将47只大鼠按表格随机法分为正常组(8只)、内毒素／脂多糖(LPS)组(24只,每观察时相点8只,均同时注射LPS制成休克模型)和拮抗组[15只,每观察时相点5只,均同时注射LPS并以吡咯烷二硫代氨基甲酸盐(PDTC)拮抗]。休克及拮抗组于注射LPS后2、6、12 h观察,并与正常组同法处死,无菌留取大鼠血标本及肝、肺、肾组织,测定组织中NF-κB活性和三磷酸鸟苷环水解酶Ⅰ(GTP-CHⅠ)和诱导型一氧化氮合酶(iNOS)mRNA表达水平、血浆和组织中的BH4含量及NO水平、肝脏和肾脏功能指标、肺组织髓过氧化物酶活性。结果与正常组(例如肺组织中NF-κB活性为26±6)比较,LPS组大鼠组织中NF-κB迅速活化(P<0．01),并于注射后2 h达峰值(肺组织中为291±44);LPS组各组织中GTP-CHⅠ和iNOS mRNA表达、BH4和NO水平也较正常组明显升高(P<0．05或0．01),至伤后12 h仍持续较高水平。此外,该组相应器官功能均受到不同程度的损害。应用PDTC的拮抗组大鼠各组织中NF-κB活性均较LPS组有所降低,GTP-CHⅠ、iNOS mRNA表达及BH4、NO水平显著受抑,肝、肺、肾功能明显改善。结论内毒素休克时机体内NF-κB通路高度活化,并对BH4／NO系统具有明显调节效应;可通过下调BH4介导的iNOS的过度活化抑制NF-κB信号途径,从而减轻组织炎性反应,对机体脏器功能起到保护作用。     

氨基胍与环孢素A联用对大鼠心脏移植后急性排斥反应的影响

目的：探讨氨基胍与环孢素A联用对同种大鼠心脏移植后急性排斥反应的影响。方法：受体SD大鼠心脏移植后分为4组：（1）对照组：术后不作任何处理;（2）低剂量环孢素A（CsA)组;术后0－7d肌肉注射CsA2mg.kg^-1.d^-1;（3）氨基胍（AG）组：术后0－7d皮下注射AG600mg.kg^-1.d^-1;（4）低剂量CsA加AG组;术后0－7d肌肉注射CsA2mg.kg^-1.d^-1及皮下注射AG600mg.kg^-1.d^-1。术后4d测定急性排斥反应时移植心的诱生型一氧化氮合酶（iNOS)的表达及血清一氧化氮（NO）含量,并观察移植心存活时间。结果与低剂量环孢素A组相比较,低剂量环孢素A与氨基胍联用组不仅显著地抑制移植心iNOS表达与NO产生（P＜0．05）;而且显著地减轻急性排斥反应（P＜0．01）,延长了移植心存活时间（P＜0．05）。结论低剂量环孢素A与氨基胍联用,协同抑制急性排斥反应时移植心iNOS活性及NO产生;显著地延长移植物存活时间。     

促红细胞生成素预先给药对大鼠内毒素性急性肺损伤的影响

目的 探讨促红细胞生成素(EPO)预先给药对大鼠内毒素性急性肺损伤的影响.方法 成年雄性SD大鼠32只,体重180～220 g,随机分为4组(n=8),C组腹腔注射生理盐水4 ml/kg(EPO溶剂对照),30 min后静脉注射生理盐水2 ml/kg[脂多糖(LP3)溶剂对照];EPO组腹腔注射EPO3 000 U/kg,30 min后静脉注射生理盐水2 ml/kg;LPS组腹腔注射生理盐水4 ml/kg,30 min后静脉注射LPS 6 mg/kg;EPO+LPS组腹腔注射EPO 3 000 U/kg,30 min后静脉注射LPS 6 mg/kg.于静脉注射LPS后4 h时处死大鼠,观察肺组织病理学结果 ,计算肺组织湿/干重(W/D)比;测定肺组织髓过氧化物酶(MPO)活性和丙二醛(MDA)、一氧化氮(NO)含量;采用Western blot法测定肺组织诱导型一氧化氮合酶(iNOS)和硝基酪氨酸(NT)的表达.结果 与C组相比,LPS组和EPO+LPs组肺组织W/D比、MPO活性、MDA和NO含量升高,iNOS和NT表达上调(P<0.01);与LPS组相比,EPO+LPS组肺组织W/D比、MPO活性、MDA和NO含量降低,iNOS和NT表达下调(P<0.01).结论 EPO预先给药可减轻大鼠内毒素性急性肺损伤,与其下调iNOS表达,减少NO生成有关.