腺花素对急性肺损伤模型小鼠的保护作用及其机制

目的 探讨腺花素对急性肺损伤(ALI)的治疗作用及其机制。方法 C57BL/6雄性小鼠30只,随机分为6组：正常对照组、模型对照组(10 mg·kg^-1脂多糖)、地塞米松组(5 mg·kg^-1地塞米松)和腺花素小、中、大剂量组(5,10和20 mg·kg^-1腺花素),每组5只。造模6 h后分别腹腔注射相应药物。18 h后,记录体质量变化,麻醉处死,取肺部样本。酶联免疫吸附测定(ELISA)检测肺组织匀浆中肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β、IL-6的含量;二喹啉甲酸(BCA)比色法和瑞氏-吉姆萨染色法分别检测肺泡灌洗液中总蛋白的浓度、巨噬细胞和中性粒细胞数目;苏木精-伊红(HE)染色观察肺组织病理学改变。采用噻唑蓝(MTT)法检测不同浓度腺花素对RAW264.7细胞生长的影响。AnnexinV-FITC/PI双染法检测腺花素对RAW 264.7细胞凋亡的影响。免疫印迹法(Western blotting)检测RAW 264.7细胞和肺组织中Toll样受体4(TLR4)、MyD88、p-NF-κB、NF-...     

地塞米松对早期脓毒症大鼠急性肺损伤的保护作用研究

目的 观察地塞米松对早期脓毒症大鼠急性肺损伤(acute lung injury,ALI)的保护作用.方法 将雄性大鼠随机分为3组:生理盐水组(N组)、脂多糖组(L组)、脂多糖+地塞米松组(LD组).各组大鼠于造模后4h麻醉处死,行动脉血气分析,测定肺组织湿/干质量比值(W/D),用RT-PCR法检测肺组织水通道蛋白1(aquaporin 1,AQP1 )mRNA表达水平.结果 与L组比较,LD组大鼠肺组织湿/千质量比明显降低,AQP1 mRNA表达水平升高,动脉血气改善.结论 地塞米松对早期脓毒症大鼠ALI有保护作用,该作用与上调肺AQP1 mRNA表达水平有关.     

PPAR-γ配体对大鼠脓毒症急性肺损伤的保护作用

目的探讨过氧化物酶体增殖物活化受体γ(PPAR-γ)配体罗格列酮对大鼠脓毒症急性肺损伤的保护作用。方法 90只SD大鼠随机均分为假手术组(SO组)、改良盲肠结扎穿孔术手术组(CLP组)和罗格列酮4mg.kg-1.d-1治疗组(RT组)。术后2、6、12、24、48h检测大鼠动脉血氧分压(PaO2)、支气管-肺泡灌洗液(BALF)中白细胞(WBC)计数和丙二醛(MDA)含量,HE染色观察肺组织病理改变。结果与SO组相比,CLP组术后肺泡肺间质水肿和炎症细胞渗出加重,PaO2显著下降,BALF中WBC计数和MDA含量显著升高(P<0.05);而RT组的上述指标均明显改善(P<0.05)。结论 PPAR-γ配体对大鼠脓毒症急性肺损伤有保护作用。     

抑制IGF-2表达对脓毒症大鼠肺损伤的保护作用

探讨抑制IGF-2对脓毒症肺损伤大鼠的保护作用.将40只大鼠随机分为假手术组、模型组、siRNA-IGF-2组、siRNA-NC组,通过盲肠穿刺法建立脓毒症模型,假手术组麻醉后开腹不进行盲肠结扎,siRNA-IGF-2组和siRNA-NC组大鼠在造模前24h鼻腔滴入siRNA-IGF-2及siRNA-NC.通过RT-q...     

姜黄素对脓毒症模型小鼠肺损伤的作用及作用机制

目的 探讨姜黄素对脓毒症模型小鼠肺损伤的作用及作用机制。方法 将48只BALB/c小鼠随机分为假手术组（7只）、手术组（17只）、假手术+姜黄素组（7只）、手术+姜黄素组（17只）,通过盲肠结扎穿刺法构建脓毒症模型小鼠,假手术组和手术组小鼠术后2 h腹腔注射0.1%二甲基亚砜,假手术+姜黄素组和手术+姜黄素组小鼠术后2 h腹腔注射200 mg/kg姜黄素（用0.1%二甲基亚砜稀释）。观察并记录术后7 d小鼠的死亡率。检测小鼠术后24 h血浆中肝肾功能指标丙氨酸氨基转移酶（ALT）、天门冬氨酸氨基转移酶（AST）、血浆尿素氮（BUN）的水平,通过伊文思蓝检测肺微血管的渗透性,且称量肺组织的湿重和干重,计算湿干重比。采用实时荧光定量聚合酶链式反应（PCR）仪检测肺组织中炎性因子肿瘤坏死因子-α(TNF-α)、白细胞介素1β(IL-1β)、白细胞介素6(IL-6)的水平,采用免疫印迹（Western blot）法检测核因子类胡萝卜素衍生2样因子2(Nrf2)和血红素加氧酶1(HO-1)的蛋白表达水平。结果 术后7 d,手术+姜黄素组小鼠的存活率为64.71%,显著高于手术组的29.41%(P...     

瑞芬太尼对脓毒症大鼠急性肺损伤保护作用的实验研究

目的观察瑞芬太尼对脓毒症所致急性肺损伤(ALI)大鼠肺湿/干质量比、肺组织病理学改变及炎症因子及丙二醛(MDA)和超氧化物歧化酶(SOD)的影响,为瑞芬太尼治疗脂多糖(LPS)诱导的ALI提供理论依据。方法采用雄性清洁级Wistar大鼠32只,体质量270～320g,随机分为四组:对照组、ALI组、瑞芬太尼处理组和瑞芬太尼对照组。ALI组于20min内尾静脉注射LPS 15mg/kg制作脓毒症ALI模型,对照组用相同量的生理盐水代替;瑞芬太尼对照组和瑞芬太尼处理组,先注射等量生理盐水/LPS,后给予瑞芬太尼(0.04mg/kg)尾静脉泵入40min。测定各组大鼠造模后6h后的肺湿/干比;苏木精-伊红(HE)染色方法对肺组织进行病理观察,ELISA检测肿瘤坏死因子(TNF-α),白介素-6(IL-6)的水平,并测定SOD活性及MDA的含量。结果与对照组比较,ALI组大鼠肺干湿比、肺组织TNF-α、IL-6水平、MDA含量增加而SOD活性显著降低(P 0.05);而瑞芬太尼显著改善上述指标的变化。肺组织病理学观察发现ALI大鼠肺组织结构损伤严重,可见大量炎性细胞聚集。而瑞芬太尼处理组大鼠的上述病理学改变则明显减轻。结论瑞芬太尼可以通过抑制肺组织炎症因子的释放,减轻氧化应激途径保护LPS所致的急性肺损伤。     

王不留行黄酮苷对脓毒症小鼠急性肺损伤保护作用及机制研究

目的 基于网络药理学和动物实验探究王不留行黄酮苷（VAC）对脓毒症小鼠急性肺损伤的保护作用机制。方法 通过 Swiss Target Prediction数据库收集 VAC的潜在作用靶点;利用 GeneCards数据库检索肺脓毒症相关的疾病靶点;运用Draw Venn Diagram 软件构建 VAC 和疾病的共同靶点;利用 STRING 11.5数据库和 Cytoscape 3.10.0软件构建共同靶点蛋白质-蛋白质相互作用（PPI）网络;利用 Metascape 数据库进行基因本体（GO）富集分析和京都基因与基因组百科全书（KEGG）通路分析。采用 ip 给予脂多糖（LPS）构建脓毒症模型,造模同时给予 VAC（1、5 mg·kg^-1）或地塞米松干预,取各组小鼠肺组织及血清,苏木精-伊红（HE）、Masson 及 TUNEL 染色观察肺组织形态变化、纤维化及细胞凋亡情况,ELISA 法和实时荧光定量 PCR（qRT-PCR）法分别检测血清和肺组织中炎症因子水平,免疫组织化学法和 Western blotting法检测肺组织炎症通路相关蛋白表达。结果 VAC和肺脓毒症共同靶点有44个;GO富集分析涉及生物过程（BP）823个条目、细胞组分（CC）52个条目和分子功能（MF）49个条目;KEGG分析筛选出癌症通路、PI3K-Akt、JAK-STAT信号通路等 20 条信号通路。验证实验结果显示,与对照组相比,模型组小鼠肺组织损伤且纤维化严重,肺脏指数显著增加（P＜0.05）,血清及肺组织中相关炎症因子表达升高（P＜0.01、0.001）。与模型组相比,VAC及地塞米松组肺组织病理形态得到改善,纤维化程度减轻,肺脏指数显著降低（P＜0.05）,血清中肿瘤坏死因子（TNF-α）、白细胞介素-1β（IL-1β）、白细胞介素6（IL-6）水平、肺组织炎症蛋白表达量及细胞凋亡数量降低,PI3K、Akt蛋白表达升高（P＜0.05、0.01、0.001）。动物实验结果与网络药理学结果一致。结论 VAC 对脓毒症小鼠急性肺损伤具有一定的保护作用,其机制可能与调控 PI3K-Akt、NLRP3/TNF-α等通路抑制炎症的发展有关,为VAC抗炎作用机制的深入研究提供了依据。     

肝X受体在百草枯致急性肺损伤小鼠肺组织中的表达及作用

目的研究肝X受体(Liver X receptors,LXRs)在百草枯(Paraquat,PQ)致急性肺损伤小鼠肺组织中的表达情况及保护作用。方法 48只雄性c57小鼠随机分为6组,对照组:0.1 m L生理盐水腹腔注射;A组(TO901317低剂量对照组):5 mg/kg TO901317腹腔注射;B组(TO901317高剂量对照组):20 mg/kg TO901317腹腔注射;C组(百草枯染毒组):百草枯28 mg/kg腹腔注射;D组(TO901317低剂量预处理组):百草枯染毒前0.5 h给予TO901317 5 mg/kg腹腔注射;E组(TO901317高剂量预处理组):百草枯染毒前0.5 h给予TO90131720 mg/kg腹腔注射。在百草枯染毒后72 h处死小鼠,收集肺组织及肺泡灌洗液标本。肺组织取出后测定肺湿重/干重比,肺组织切片后HE染色进行肺损伤评分,采用ELISA方法检测肺泡灌洗液中IL-1β和TNF-α含量,Western blot方法检测肺组织中LXRs(LXRα和LXRβ)及Toll样受体4(TLR-4)的表达。结果对照组小鼠肺组织中可检测到较高水平的LXRα和LXRβ表达,与对照组相比,百草枯中毒组小鼠LXRα和LXRβ表达明显减少,肺湿重/干重比及肺损伤评分显著增加,肺泡灌洗液中IL-1β和TNF-α含量明显增高,TLR-4表达明显增加。上述改变在TO901317预处理组明显减轻,减轻程度与TO901317剂量有关。结论肝X受体可以在正常小鼠肺组织的中表达,百草枯中毒可显著抑制肝X受体在小鼠肺组织中表达,应用LXRs激动剂TO901317能明显减轻百草枯导致的小鼠急性肺损伤程度,这一作用可能与LXRs抑制TLR-4在肺组织中的表达有关。     

基于Toll样受体4/髓样分化蛋白88通路研究马齿苋多糖对小鼠急性肺损伤的保护作用

目的 探讨马齿苋多糖对脂多糖(LPS)诱导小鼠急性肺损伤(ALI)的保护作用及其机制。方法 水提醇沉法提取马齿苋多糖,配置浓度为10 mg·mL^-1马齿苋多糖溶液。将小鼠随机分为空白组、模型组、阳性对照组、低剂量实验组、高剂量实验组。低、高剂量实验组分别灌胃10和40 mg·kg^-1·d^-1马齿苋多糖溶液,阳性对照组灌胃2 mg·kg^-1·d^-1地塞米松,空白组和模型组灌胃等量蒸馏水。灌胃7 d后,除空白组外,其余各组均腹腔注射10 mg·kg^-1 LPS制备急性肺损伤模型。24 h后眼眶取血及肺组织样本。用酶联免疫吸附(ELISA)法检测血清肿瘤坏死因子α(TNF-α)含量;用比色法测定肺组织匀浆中髓过氧化物酶(MPO)和血清中超氧化物歧化酶(SOD)含量;用原位末端标记(TUNEL)法检测细胞凋亡情况;用蛋白质印迹法检测肺中Toll样受体4(TLR4)、髓样分化蛋白88(MyD88)、B淋巴细胞瘤-2相关X蛋白(Bax)表达情况。结果 空白组、模型组、...     

氯化钆对脓毒症大鼠急性肺损伤的肺保护作用

目的探讨氯化钆(GdCl3)在脓毒症大鼠急性肺损伤中的肺保护作用及可能机制。方法采用盲肠结扎穿孔术(CLP)建立脓毒症模型。将36只成年Wistar大鼠随即均分为假手术组(Sham组)、脓毒症组(CLP组)和氯化钆治疗组(GdCl3组),GdCl3组术后经尾静脉注射氯化钆溶液。检测血浆TNF-α、丙二醛(MDA)水平,用HE染色法观察肺组织形态,测定肺湿/干重比,统计方法采用SPSS19.0。结果 GdCl3组血浆TNF-α及MDA水平、肺湿/干重比均显著低于CLP组(P<0.05),光镜下可见GdCl3组肺组织病理学改变明显减轻。结论 GdCl3可明显减轻脓毒症所致的急性肺损伤的炎性反应。     

银杏叶提取物注射液对脂多糖致大鼠急性肺损伤肺组织的保护作用

目的 观察银杏叶提取物注射液（GBE）对脂多糖（LPS）致大鼠急性肺损伤（ALI）肺组织的保护作用及其可能机制。方法 24只健康雄性Wistar大鼠随机分为对照组、LPS组和GBE组,每组8只。尾静脉注射LPS建立ALI模型,光镜下观察大鼠肺组织形态学改变;检测肺组织中超氧化物歧化酶活性（SOD）和丙二醛（MDA）含量及血清中白细胞介素-6（IL-6）的表达变化。结果 与对照组相比,LPS组肺组织中SOD活性降低、MDA含量增加、血清中IL-6含量增加（P<0.05）;应用GBE后,肺组织SOD活性升高、MDA含量减少、血清中IL-6含量减少（P<0.05）。结论 GBE可有效减轻ALI肺组织的炎症反应,其机制可能与其提高大鼠抗氧化能力、升高血清中IL-6的含量有关。     

Protective effects of caffeoylxanthiazonoside isolated from fruits of Xanthium strumarium on sepsis mice

Abstract

Context: The fruit of Xanthium strumarium L. (Asteraceae) has been used for the treatment of various inflammatory diseases.

Objective: This study investigates the protective effect of caffeoylxanthiazonoside (CYXD) isolated from fruits of X. strumarium on sepsis mice in vitro and in vivo.

Materials and methods: Cecal ligation and puncture (CLP) operation was used to establish the sepsis mice model, and sham mice were also performed. CYXD was administered by intraperitoneal injection (10, 20, and 40?mg/kg/d), then the survival rate was measured in 96?h. Additionally, sepsis mice were induced by injection LPS (2?mg/kg); CYXD was administered by intraperitoneal injection (10, 20, and 40?mg/kg/d), then mice were sacrificed, and serum levels of TNF-α and IL-6 were determined by ELISA assay. Furthermore, the ability of CYXD to neutralize LPS was measured by using the LAL test, and expressions of TNF-α, IL-6 were determined by using real-time fluorogenic PCR.

Results: Results indicated that CYXD significantly elevated survival rates of sepsis mice induced by CLP (p?<?0.05) with survival rates of 35%, 45%, and 65%. Furthermore, the LPS level was decreased obviously by CYXD (1, 2, and 4?mg/L) (p?<?0.05). Additionally, CYXD (10, 20, and 40?mg/kg) can not only significantly decrease TNF-α and IL-6 levels induced by LPS in mice's serum (p?<?0.05), but also inhibit mRNA expressions of TNF-α and IL-6 induced by LPS in RAW 264.7 cells at doses of 20, 40, and 80?μg/mL (p?<?0.05).

Conclusion: Our study demonstrated that CYXD has significant protective effects on sepsis mice.     

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.     

脓毒症致急性肺损伤相关的microRNAs研究进展

脓毒症是导致全球范围内急重症患者死亡的最常见病因, 其本质是由于机体促炎和抗炎过程失衡, 导致全身炎症级联反应发生和特异性免疫功能障碍, 并最终演变成多器官功能障碍综合征(multiple organ dysfunction syndrome, MODS)。在脓毒症的发生发展过程中, 肺脏损伤的相关表现尤为常见, 继发于脓毒症的急性肺损伤(acute lung injury, ALI)或急性呼吸窘迫综合征(acute respiratory distress syndrome, ARDS)是脓毒症患者致死的最主要原因。因此, 早期识别和诊断脓毒症相关肺损伤对患者诊治具有重要意义。作为一种单链非编码RNAs, microRNAs具有较高的生物特异性、选择性和保守性, 当前已作为理想的生物标志物被用于多种疾病的临床诊断。多项研究证实, microRNAs在脓毒症相关肺损伤的发病过程中差异表达, 通过监测和分析其变异水平能有效对脓毒症相关肺损伤的诊断及预后进行判断。本文回顾分析microRNAs在脓毒症相关肺损伤中的系列研究, 现对异常表达的microRNAs及其在脓毒症相关肺损伤中的作用机...     

Combined delivery of angiopoietin-1 gene and simvastatin mediated by anti-intercellular adhesion molecule-1 antibody-conjugated ternary nanoparticles for acute lung injury therapy

Effective treatment for acute lung injury (ALI) is in high demand. Lung-targeted ternary nanoparticles containing anti-intercellular adhesion molecule-1 (ICAM-1) antibody-conjugated simvastatin-loaded nanostructured lipid carrier (ICAM/NLC), protamine (Pro), and angiopoietin-1 (Ang-1) gene (ICAM-NLC/Pro/Ang) were developed for ALI therapy. The ternary nanoparticles with different weight ratios of ICAM-NLC to Ang-1 gene were prepared via charge interaction. The anti-ICAM-1 antibody-conjugated ternary nanoparticles exhibited higher cellular uptake and transfection efficiency (from 26.7% to 30.9%) in human vascular endothelial cell line EAhy926 than the non-targeted control. The largest size of ICAM-NLC/Pro/Ang (357.1 nm) was employed for further study, which significantly up-regulated in vitro and in vivo Ang-1 protein expression. In vivo i.v. administration of ICAM-NLC/Pro/Ang (357.1 nm) significantly attenuated pulmonary TNF-α and IL-6 levels, inflammatory cell infiltration, and led to positive histological improvements in lipopolysaccharide-induced ALI mice. Collectively, the ICAM-NLC/Pro/Ang that co-delivered simvastatin and Ang-1 gene may represent a potential treatment modality for ALI.     

Protective effects of intranasal curcumin on paraquot induced acute lung injury (ALI) in mice

Paraquot (PQ) is widely and commonly used as herbicide and has been reported to be hazardous as it causes lung injury. However, molecular mechanism underlying lung toxicity caused by PQ has not been elucidated. Curcumin, a known anti-inflammatory molecule derived from rhizomes of Curcuma longa has variety of pharmacological activities including free-radical scavenging properties but the protective effects of curcumin on PQ-induced acute lung injury (ALI) have not been studied. In this study, we aimed to study the effects of curcumin on ALI caused by PQ in male parke's strain mice which were challenged acutely by PQ (50 mg/kg, i.p.) with or without curcumin an hour before (5 mg/kg, i.n.) PQ intoxication. Lung specimens and the bronchoalveolar lavage fluid (BALF) were isolated for pathological and biochemical analysis after 48 h of PQ exposure. Curcumin administration has significantly enhanced superoxide dismutase (SOD) and catalase activities. Lung wet/dry weight ratio, malondialdehyde (MDA) and lactate dehydrogenase (LDH) content, total cell number and myeloperoxidase (MPO) levels in BALF as well as neutrophil infiltration were attenuated by curcumin. Pathological studies also revealed that intranasal curcumin alleviate PQ-induced pulmonary damage and pro-inflammatory cytokine levels like tumor necrosis factor-α (TNF-α) and nitric oxide (NO). These results suggest that intranasal curcumin may directly target lungs and curcumin inhalers may prove to be effective in PQ-induced ALI treatment in near future.     

p38MAPK inhibition attenuates LPS-induced acute lung injury involvement of NF-kappaB pathway

The pathogenesis of acute lung injury/acute respiratory distress syndrome (ARDS) is complex and involves multiple signal transduction processes. It is believed that p38MAPK (mitogen-activated protein kinase) is one of the most kinases in inflammatory signaling. At present study, we demonstrated the role of p38MAPK in lipopolysaccharide (LPS)-induced acute lung injury with pharmacologic p38MAPK inhibition by SB203580. SB203580, p38MAPK specific inhibitor, was injected (10 mg/kg, i.v.) 30 min before LPS administration (5 mg/kg, i.v.). The hematoxylin-eosin staining of lung tissues showed that p38MAPK inhibition significantly attenuated the pulmonary inflammatory responses induced by LPS. Moreover, SB203580 can also inhibit the inflammatory cytokine release, and reduce the mortality rate of LPS-induced acute lung injury. Further, western blot analysis that showed SB203580 administration can inhibit the activation of NF-kappaB, which was associated with the inhibition of IkappaBalpha degradation in cytoplasm. These data suggest that p38MAPK signaling may be involved in the activation of NF-kappaB, and activation of p38MAPK signaling may be one of the mechanisms of acute lung injury.     

双调蛋白对小鼠呼吸机相关性肺损伤的保护作用及机制研究

目的 研究上皮生长因子双调蛋白(Amphiregulin,Areg)对呼吸机相关性肺损伤(ventilator-associated lung injury,VALI)肺组织的保护作用,并探讨其作用机制。方法 将C57BL/6小鼠根据随机数字表法随机分为8组: ①对照组(Control组),每只腹腔注射磷酸盐缓冲液(PBS) 200 μL,维持正常呼吸;②Areg组,腹腔注射重组小鼠Areg蛋白(rmAreg),维持正常呼吸;③PBS+VALI组,腹腔注射PBS,30min后行机械通气;④Areg+VALI组,腹腔注射rmAreg,30 min后行机械通气;⑤DMSO+VALI组;⑥DMSO+Areg+VALI组,每只腹腔注射二甲基亚砜(dimethylsulfoxide,DMSO)100 μL,30 min后腹腔注射PBS或rmAreg,再经30 min后行机械通气;⑦AG1478+Areg+VALI组与⑧Perifosine+Areg+VALI组,每只腹腔注射AG1478 1 mg或Perifosine 1 mg,30 min后腹腔注射rmAreg,再经30 min后行机械通气。 小鼠通过大潮气量机械通气(潮气量12 mL/kg,频率90次/分,通气4 h)制作VALI模型。机械通气24 h后行肺组织HE染色并观察病理学变化,检测支气管肺泡灌洗液(Bronchoalveolar lavage fluid,BALF)中总蛋白、免疫球蛋白M(Immunoglobulin M,IgM)、肿瘤坏死因子α-(Tumor necrosis factor,TNF-α)与白细胞介素-6(Interleukin-6,IL-6)的浓度;机械通气6 h后检测肺组织中上皮生长因子受体(Epidermal growth factor receptor,EGFR)与蛋白激酶B(AKT)的磷酸化水平。结果 与0 h组[(62.0±19.4) pg/mL]相比,VALI小鼠在机械通气结束3、6、12、24 h后BALF中的Areg浓度有明显升高,其中在6 h升高最为显著[(231.8±58.7) pg/mL]。与Control组相比,PBS+VALI组小鼠的肺组织肺泡壁增厚,炎症反应显著增加,而在Areg+VALI组中这些病理损伤均有明显减轻。与Control组相比,PBS+VALI组小鼠BALF中总蛋白、IgM、TNF-α与IL-6均有显著升高,而相较于PBS+VALI组,Areg+VALI组中这些指标有明显降低。rmAreg显著提高了VALI小鼠肺组织中EGFR与AKT的磷酸化水平。AG1478与Perifosine均明显抑制了rmAreg对VALI肺组织的作用效果。结论 小鼠发生VALI后肺组织中Areg的表达量显著增加。Areg通过EGFR-AKT信号通路减轻肺组织病理学变化、渗透性与炎症反应,因此在VALI中具有明显的保护作用。     

乌司他丁对感染性休克患者肺损伤的保护作用

目的探讨大剂量乌司他丁对感染性休克患者肺损伤的保护作用。方法80例感染性休克合并肺损伤患者随机均分为两组:A组在综合治疗基础上加用乌司他丁(100万U泵注,每12小时1次,连续应用7d);B组仅采取综合治疗。治疗前及治疗后第3、7天检测肺泡灌洗液肿瘤坏死因子α(TNF-α)和白细胞介素1β(IL-1β)表达及肺血管外肺水含量。比较两组ICU住院时间和疗效。结果与B组比较,A组ICU住院时间缩短[(8.7±2.9)d vs.(11.4±3.5)d](P<0.05),治疗有效率高(75.0%vs.62.5%)(P<0.05),病死率低(15.0%vs.27.5%)(P<0.05)。A组治疗后肺泡灌洗液TNF-α、IL-1β和肺血管外肺水含量低于B组(P<0.05)。结论大剂量乌司他丁可减少感染性休克患者肺部炎症反应及毛细血管渗漏,改善预后。