橘红桔梗植物饮品对小鼠急性肺损伤和支气管哮喘的预防作用研究

目的：观察橘红桔梗植物饮品（TPC）对脂多糖诱导的小鼠急性肺损伤（ALI）和卵清蛋白诱导的小鼠支气管哮喘的影响,并分析其作用机制。方法：（1）将48只雄性C57BL/6小鼠随机分成空白对照组、ALI组及低、中、高剂量（0.8、1.6和3.2 mL/d）TPC组,灌胃给药,每日1次,持续1周及地塞米松阳性对照组。采用脂多糖气管内滴注建立小鼠ALI模型。采用HE染色法观察肺组织病理变化;流式细胞分析仪检测支气管肺泡灌洗液（BALF）中性粒细胞比例;ELISA检测BALF中肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、IL-6和IL-10含量;同时检测肺组织匀浆中的髓过氧化物酶（MPO）活性及肺组织中I-κBα和NF-κB的蛋白含量。（2）将48只雌性C57BL/6小鼠随机分成空白对照组、支气管哮喘组及低、中、高剂量（0.8、1.6和3.2 mL/d）TPC组,灌胃给药,每日1次,持续1周及地塞米松组。采用卵清蛋白腹腔注射致敏和鼻内刺激建立支气管哮喘小鼠模型。采用HE染色和甲苯胺蓝染色法观察肺组织病理变化;ELISA检测小鼠血清中IgE、IL-5和IL-13含量。结果：与空白对...     

小鼠间质性肺病循环纤维细胞的水平与肺部炎症和纤维化有关

目的研究博来霉素(BLM)诱导的间质性肺病(ILD)和胶原蛋白诱导关节炎联合博来霉素诱导的间质性肺病(CIA-ILD)小鼠模型肺部病变的发展、病理特点及其与循环纤维细胞(CF)消长的相关性。方法 90只C57BL/6小鼠随机分为3组:对照组(S)组、BLM诱导(B)组和CIA联合BLM诱导(CB)组。分别于BLM处理后第2、7、14、21、28天,HE染色观察肺组织急性炎症,天狼星红染色观察肺组织纤维化情况,免疫组织化学染色观察α-平滑肌肌动蛋白的表达,流式细胞术检测外周血CF(CD45+Col1+细胞)并与病变的程度进行相关性分析。结果 2组小鼠肺组织病理变化均呈现为肺泡炎至纤维化的动态改变,B组在BLM刺激后第7~14天炎性病变最明显,第21、28天病变趋于好转;CB组第14天开始出现肺泡结构明显破坏伴有胶原沉积,病变逐渐加重至第28天达最高峰;与B组相比,CB组肺组织羟脯氨酸含量在第14天后明显增加(P0.05);2组外周血CF均在给药后出现先增高后下降的趋势,且CB组在第14、21、28天明显高于同一时间点B组的CF数量(P0.05);免疫组化结果显示,CB组亦在第14天至第28天有大量肌纤维母细胞聚集;外周血CF数量与肺部炎症、纤维化评分及肺组织羟脯氨酸含量呈正相关(r=0.847、0.826、0.735,P0.01)。结论 CIA-ILD小鼠模型更为接近RA-ILD病理过程,循环纤维细胞可能参与了肺部炎症和纤维化病理进程。     

旋毛虫成虫可溶性虫体蛋白对葡聚糖硫酸钠诱导的小鼠急性结肠炎的影响

本文探讨旋毛虫成虫可溶性虫体蛋白(Soluble adult proteins,SAP)对葡聚糖硫酸钠(Dextran sulphate sodium,DSS)诱导的C57 BL/6小鼠结肠炎的影响.将36只小鼠随机均分为3组:对照组(PBS 组)、肠炎组(PBS+ DSS组)、虫体蛋白治疗组(SAP+ DSS组).小鼠连续饮用3％DSS溶液7d诱发急性肠炎,对照组给予双蒸水.诱发肠炎的同时,治疗组每天经腹腔注射25μg虫体蛋白,肠炎组注射PBS.每天观察对照组和实验组小鼠的临床表现,并进行临床疾病活动指数(DAI)评分.第7d将小鼠处死,观察结肠肉眼或大体病变及组织病理改变.同时提取小鼠脾淋巴细胞和肠系膜淋巴结细胞,用酶联斑点免疫试验检测细胞因子水平.结果显示,与肠炎组相比,虫体蛋白治疗组的小鼠肠炎症状明显缓解,结肠病理变化较轻,脾淋巴细胞和肠系膜淋巴结细胞的Th1型细胞因子IFN-γ分泌水平下降,Th2型细胞因子IL-4和调节性细胞因子IL-10分泌水平显著升高.表明旋毛虫可溶性成虫虫体蛋白对DSS诱导的C57BL/6小鼠结肠炎有缓解作用.     

姥鲛烷诱导法建立小鼠狼疮肾炎模型

目的:采用姥鲛烷诱导建立C57BL/6小鼠狼疮肾炎模型,并进行生物学鉴定和形成机制的探讨。方法:模型组小鼠单次腹腔注射0. 5 mL姥鲛烷,对照组同方式注射等量生理盐水。注射后监控生存状态;第10天采用流式细胞术分析脾脏巨噬细胞、粒细胞、树突状细胞及B细胞的活化情况;间接免疫荧光法每月检测血清抗核抗体(ANA)及抗双链DNA(dsDNA)抗体的滴度,Albustix试纸法分析尿蛋白含量;注射后8个月处死小鼠并取肾脏,经直接免疫荧光法观测免疫复合物沉积状况,免疫组化法分析干扰素γ(IFN-γ)与白细胞介素4(IL-4)的表达,并进行HE染色及透射电镜病理检查。结果:第10天时脾脏巨噬细胞、粒细胞、树突状细胞及B细胞呈不同程度活化(P0. 05),B细胞表面标志物B7-1、B7-2及MHC-Ⅱ表达上调(P0. 05);3～8个月时血清ANA和抗dsDNA抗体水平进行性升高(P0. 05),3只小鼠出现腹水,1只消瘦并最终于7个月时死亡;4个月时3只小鼠出现蛋白尿,8个月时蛋白尿阳性率100%,尿蛋白含量1～20 g/L;8个月时腹腔内出现大量的异位淋巴组织,肾小球及系膜区免疫复合物沉积严重,肾组织中IFN-γ表达量升高,淋巴细胞侵润、组织坏死、电子致密物沉积等病理损伤明显,而对照组未见明显脾脏免疫细胞活化及自身抗体、蛋白尿产生,肾脏中IFN-γ与IL-4表达正常,无明显肾脏免疫复合物沉积及病理性改变。结论:采用姥鲛烷诱导法建立了与人类狼疮肾炎症状类似的C57BL/6小鼠狼疮肾炎模型。     

microRNA-181c-5p抑制Bcl2L11/Bim减轻压力超负荷诱导的小鼠心力衰竭

目的 探讨MicroRNA-181c-5p(miR-181c-5p)对压力超负荷诱导(TAC)的心力衰竭的作用机制.方法 30只雄性C57BL/6小鼠随机分成对照组、TAC组和TAC+miR-181c-5p组.采用主动脉弓缩窄诱导小鼠心力衰竭动物模型,造模过程中,对模型组小鼠心肌多点注射给予5× 106U/10μL过表...     

miR-150 基因缺失对小鼠繁殖和血液学指标的影响

目的:探讨miR-150 基因缺失对小鼠繁殖和血液学指标的影响。方法:采用miR-150ko 小鼠观察该小鼠的窝产仔数和离乳率及生长曲线,测定其生殖指标;以全自动血球计数仪和自动生化分析仪测定2 月龄miR-150ko 小鼠和正常对照C57BL/6J 小鼠血液细胞学和血清生化参数。结果:miR-150ko 小鼠窝产仔数与离乳率与C57BL/6J 正常对照小鼠相比均显著下降;miR-150ko 小鼠外周血白细胞计数、中间细胞数、中性粒细胞数、中间细胞百分比、中性粒细胞百分比与C57BL/6J小鼠相比显著升高;而血小板计数、淋巴细胞百分比显著下降;miR-150ko 小鼠的血清葡萄糖、总胆固醇水平较正常对照小鼠显著增高。结论:miR-150 基因缺失可影响到小鼠的繁殖功能,并对某些血液细胞学指标及血糖、胆固醇水平产生影响。     

具有SLE疾病症状的MRL/lpr小鼠体内自噬水平检测

目的检测16周龄MRL/lpr小鼠发病情况,并研究发病后的MRL/lpr小鼠脾脏自噬水平。方法采用雌性MRL/lpr小鼠和雌性C57BL/6小鼠,分别于16周龄时检测2组小鼠脏器系数,ELISA检测血清抗ds-DNA、ANA的水平,淋巴结、肾脏病理HE染色观察,以检测MRL/lpr小鼠发病情况。取发病小鼠,Western blot检测2组小鼠脾脏自噬相关蛋白Beclin-1、ATG5、P62、LC3Ⅱ/Ⅰ的表达,Real-time PCR检测自噬相关基因Beclin-1、ATG5、Atg12、LC3B mRNA的表达,流式检测2组小鼠脾脏中B细胞和浆细胞的比例。结果 16周龄MRL/lpr小鼠脾脏、淋巴结脏器系数升高,血清中自身抗体水平显著升高,淋巴结和肾脏均出现一定程度的病理性改变。此时脾脏中的自噬相关蛋白Beclin-1、ATG5、LC3Ⅱ/Ⅰ表达均高于C57BL/6小鼠,P62的表达显著低于C57BL/6小鼠,自噬相关基因ATG5 mRNA的表达也显著升高。此外,相较于C57BL/6小鼠,MRL/lpr小鼠脾脏中B细胞数量减少,而抗体分泌型浆细胞数量显著升高。结论 16周龄MRL/lpr小鼠已出现狼疮样症状,出现自噬水平异常升高的现象,并且脾脏中抗体分泌型浆细胞的增多可能与异常升高的自噬水平密切相关。     

粉尘螨蛋白致敏小鼠肺部变应性炎症模型的建立

目的　研究以粉尘螨蛋白建立小鼠肺部变应性炎症模型的方法。方法　将C57BL/6小鼠分为对照组和实验组。实验组在第1、3、5、7、9和11d采取腹腔注射进行致敏,再用粉尘螨提取液多次雾化激发（第13、16、19、20和21d）,最后1次雾化24 h后对小鼠作肺泡灌洗。对照组用生理盐水替代。观察肺组织病理变化与支气管肺泡灌洗液（BALF）细胞计数和分类,用酶联免疫吸附试验（ELISA）测定BALF和脾细胞培养上清中IL-4与IFN-γ含量,用BCA法测定BALF中蛋白的含量。结果　实验组C57BL/6小鼠肺组织呈明显炎症病理改变;BALF中细胞总数、淋巴细胞数和嗜酸性粒细胞计数明显升高（P<0.01）;BALF中IL-4明显升高（P<0.01）,IFN-γ显著降低（P<0.01）;脾细胞培养上清IL-4也明显升高,（P<0.01）,IFN-γ显著降低（P<0.01）。结论　用腹腔注射粉尘螨蛋白致敏后再雾化激发的方式能够在C57BL/6小鼠体内成功构建肺部变应性炎症模型。     

CTLA-4Ig联合髓腔内骨髓移植诱导小鼠同种异体皮肤移植耐受的研究

目的探讨细胞毒性T淋巴细胞相关抗原4免疫球蛋白(Cytotoxic T Lymphocyte Antigen4-immunoglobulin,CTLA4-Ig)与髓腔内骨髓移植(IBM-BMT)联合应用对诱导供体小鼠皮肤移植免疫耐受的促进bd作用。方法受鼠为C57BL/6(H-2,B6)雌性小鼠,于第0天输注雄性BALB/c(2)小鼠来源的骨髓细胞(BMC),同时腹腔注射CTLA4-Ig;第6天进行皮肤移植,并于移植术后第2天再进行一次腹腔注射CTLA4-Ig,观察皮肤移植物存活时间。通过皮肤移植物的组织学分析,以及混合淋巴细胞反应(MLR)检测耐受状态,并通过骨髓染色体分析了解BMT的植入程度。结果联合治疗组B6小鼠的皮肤移植物平均存活时间(MST)显著长于其它各组(P<0.05);MLR结果证明,联合组B6小鼠获得供体特异性耐受,在耐受小鼠骨髓中可检测到一定比例的Y染色体存在。结论 CTLA4-Ig与髓腔内骨髓移植可保证异基因的骨髓细胞形成嵌合体,显著延长了移植物存活时间,诱导免疫耐受。     

金属氧化物材料对小鼠急性肺损伤作用的研究

 摘要：目的 以C57 BL/6小鼠为模型对氧化铜、氧化铁、氧化钛、氧化硅等金属氧化物纳米材料的呼吸系统毒性进行比较和评估。方法 给C57 BL/6小鼠气管注射金属氧化物纳米材料,对给药后小鼠的死亡率、肺湿干比以及小鼠肺泡灌洗液中细胞因子的水平进行检测。结果 注射较高剂量氧化铜纳米材料的小鼠在24 h 内全部死亡,而相同剂量下注射其他金属氧化物未导致小鼠死亡;注射氧化铜纳米的小鼠肺湿干比显著高于对照组,且小鼠肺泡灌洗液中白细胞介素6的水平显著上升,而其他金属氧化物并未导致小鼠肺湿干比或白细胞介素6的水平的显著升高。结论 氧化铜纳米材料对C57 BL/6小鼠具有很强的致死性,并且引起小鼠肺水肿,导致小鼠急性肺损伤。而其他几种金属氧化物纳米材料的毒性较低,对小鼠的急性肺损伤作用较小。炎症因子IL-6水平在注射氧化铜纳米后显著增加,可能在氧化铜诱导的急性肺损伤中起到重要作用。     

Pathogenic role of B cells in the development of diffuse alveolar hemorrhage induced by pristane

Diffuse alveolar hemorrhage is an uncommon, yet often fatal, complication of systemic lupus erythematosus (SLE). Advances in the treatment of alveolar hemorrhage have been hampered because of the heterogeneity of clinical findings and the lack of suitable animal models. A single intraperitoneal injection of pristane induces a lupus-like syndrome characterized by lupus-related autoantibodies and glomerulonephritis in non-autoimmune-prone strains of mice. In addition, C57BL/6 (B6) mice frequently develop alveolar hemorrhage within a few weeks of pristane injection. Immunopathogenesis of pristane-induced alveolar hemorrhage was investigated in the present study. Early (2-4 weeks after injection) mortality due to hemorrhage was unique to C57BL/6 and C57BL/10 strains of mice. Recruitment of the macrophages and neutrophils preceded the hemorrhage by several days, and hemorrhage started 3-7 days after pristane injection in some mice, peaked at 2 weeks (84% in B6) and then resolved by 4 weeks in a majority of mice. Alveolar hemorrhage was independent of MyD88 (myeloid differentiation factor 88), or TLR7 pathways, in contrast to autoantibody production and glomerulonephritis, and was also independent of FcγR or Fas. Rag1(-/-) mice had a reduced prevalence of alveolar hemorrhage compared with B6 (P=0.01) congenics. However, T-cell receptor-deficient mice developed alveolar hemorrhage at a rate comparable to wild-type controls, whereas B6 Igμ(-/-) mice surprisingly had a strikingly reduced prevalence (7% vs 84% in B6, P<0.0001). Reconstitution of B6 Igμ(-/-) mice with wild-type B cells increased the prevalence to 50% (P=0.028). Pristane-induced alveolar hemorrhage is a useful model to study the pathogenesis and develop new therapy for this underappreciated and often life-threatening complication of SLE.     

Critical role of TLR7 in the acceleration of systemic lupus erythematosus in TLR9-deficient mice

Accumulating evidence supports the idea that TLR7 and TLR9 play pathogenic and protective roles, respectively, in the development of murine systemic lupus erythematosus (SLE). However, the molecular mechanism responsible for the accelerated development of SLE resulting from the deletion of TLR9 and the respective contributions of TLR7 and TLR9 to the development of different autoimmune responses against nuclear and non-nuclear autoantigens implicated in lupus nephritis have not been well defined. In the present study, we addressed these questions by assessing the effect of the TLR9 and/or TLR7 deletion on the production of various autoantibodies and the development of lupus nephritis in C57BL/6 mice congenic for the Nba2 (NZB autoimmunity 2) locus (B6.Nba2). TLR9-deficient B6.Nba2 mice displayed increased production of autoantibodies against nuclear antigens, serum retroviral gp70 and glomerular matrix antigens, and developed a markedly accelerated form of lupus nephritis. Enhanced disease was associated with functionally upregulated expression of TLR7, as documented by an increased TLR7-dependent activation of B cells and plasmacytoid dendritic cells. Notably, disease exacerbation in TLR9-deficient mice was completely suppressed by the deletion of TLR7. Our results indicate that TLR7 has a pivotal role in a wide variety of autoimmune responses against DNA- and RNA-containing nuclear antigens, retroviral gp70 and glomerular matrix antigens implicated in murine SLE, and that enhanced TLR7 activity is critical for the accelerated development of SLE in TLR9-deficient lupus-prone mice.     

Pristane诱导小鼠系统性红班狼疮动物模型的研究

目的:建立pristane诱导的系统性红斑狼疮(SLE)小鼠模型,并对该小鼠模型的发病机制进行初步的探讨。方法:6-8周龄雌性BALB/c小鼠单次腹腔注射pristane0.5mL,对照组单次腹腔注射PBS0.5mL,注射前及注射后每2周行流式细胞术(FCM)检测外周血中IFN-α分泌细胞(CD11b+Ly6Chigh)的比例及细胞活化状态B220+Aβ1dhigh),ELISA检测血清中自身抗体(anti-dsDNA,anti-smRNP,anti-ribosomalP0)的含量。至6个月处死动物,FCM检测腹腔细胞中IFN-α分泌细胞(CD11b+Ly6Chigh)的比例和脾脏中细胞的活化(B220,Aβ1d),采用直接免疫荧光法标记小鼠肾脏免疫球蛋白复合物及H&E染色评估小鼠肾脏免疫复合物的沉积及损伤情况。结果:小鼠腹腔注射pristane第2个月开始血清总IgG升高,第3个月起出现自身抗体阳性,到个6月时达到最高,并维持高水平至被处死;Pristane处理6个月后,Pristane处理组小鼠出现关节炎症状,肾脏免疫复合物的大量沉积和明显肾脏损伤。Pristane注射2周起,小鼠外周血中IFN-α分泌细胞(CD11b+Ly6Chigh)的比例明显高于PBS注射组,小鼠腹腔细胞中IFN-α分泌细胞的比例也明显升高;同时外周血和脾细胞中B细胞表面MHCII分子Aβ1d的平均荧光强度(MFI)均高于对照组,表明pristane处理组小鼠中B细胞发生了显著活化。结论:BALB/c小鼠腹腔注射pristane可诱导构建小鼠SLE模型,其SLE的发病可能与IFN-α的持续分泌导致B细胞的异常活化有关。该模型的建立为进一步研究SLE的发病机制提供了良好的动物模型。     

Vitamin D supplementation ameliorates arthritis but does not alleviates renal injury in pristane-induced lupus model

Systemic lupus erythematosus (SLE) is a multifactorial and autoimmune inflammatory disease with pleomorphic clinical manifestations involving different organs and tissues. The study of different murine models has provided a better understanding of these autoimmune phenomena. Pristane-induced lupus represents a suitable model to study factors that could influence the induction and/or progression of SLE, including genetic factors. The objective of the present study was to evaluate the development and evolution of SLE after vitamin D supplementation in PIL model. Here, we evaluated the effects of vitamin D supplementation in model of pristane-induced SLE in female BALB/c mice. The animals were randomly divided into three groups: control group (CO), pristane-induced lupus group (PIL) and pristane-induced lupus group plus vitamin D (VD). Lupus was induced in PIL and VD groups using pristane. PIL group showed arthritis and kidney injury, characterized by increased proteinuria, glomerular mesangial expansion and inflammation. Moreover, PIL model showed increased levels of IL-6, TNF-α and IFN-γ in serum. We observed that treatment with vitamin D improved arthritis through reduced of incidence and arthritis clinical score and edema, but does not influenced renal injury. Treatment with vitamin D was not able to reduce proteinuria levels, decrease mesangial hypercellularity or IgG and IgM deposition in the kidney. Vitamin D supplementation did not alter IL-6, TNF-α, IL-2 and IL-4, but reduce IFN-γ. These results support that the role of vitamin D may be different depending on acting site, what could explain different responses according clinical phenotype. Therefore, further investigations of vitamin D are needed to explore the supplement dosage, timing, and the molecular basis in SLE.     

Differential susceptibility to acute Trypanosoma cruzi infection in BALB/c and C57BL/6 mice is not associated with a distinct parasite load but cytokine abnormalities

Inoculation of Trypanosoma cruzi, Tulahuén strain, into C57BL/6 and BALB/c mice led to an acute infection characterized by marked parasitaemia, myocardial inflammation and thymocyte depletion. While C57BL/6 mice showed a progressive and lethal disease, BALB/c mice partly recovered. To characterize these murine models more effectively, we studied the parasite burden, serum levels of major infection outcome-related cytokines, the in vitro features of T. cruzi infection in peritoneal macrophages and the immunophenotype of thymic cells. The greater disease severity of T. cruzi-infected C57BL/6 mice was not linked to an increased parasite load, as parasitaemia, myocardial parasite nests and amastigote counts in peritoneal macrophages were not different from those in BALB/c mice. Cortical thymocyte loss was accompanied by the presence of apoptotic bodies and fragmented nuclear DNA, whereas fluorocytometric analysis at 17 days postinfection (p.i.) revealed a more pronounced loss of CD4+ CD8+ cells in C57BL/6 mice. This group displayed higher levels of TNF-alpha on days 14 and 21 p.i., in the presence of lower IL-1beta and IL-10 concentrations by days 14 and 21, and days 7 and 14 p.i., respectively. Day-21 evaluation showed higher concentrations of nitrate and TNF-alpha soluble receptors in C57BL/6 mice with no differences in IFN-gamma levels, with respect to the BALB/c group. Increased morbidity of C57BL/6 T. cruzi-infected mice does not seem to result from an aggravated infection but from an unbalanced relationship between pro- and anti-inflammatory mediators.     

罗哌卡因通过 HMGB1 / NF-κB 通路减轻 LPS 诱导的小鼠急性 肺损伤

目的 探讨罗哌卡因 ( ropivacaine, Rop) 对脂多糖 ( lipopolysaccharide, LPS) 诱导的小鼠急性 肺损伤 (acute lung injury, ALI) 的作用及其机制。 方法 气管内滴注 LPS 诱导肺损伤小鼠模型, 并将小鼠 随机分为 6 组: 对照组、 LPS 组、 罗哌卡因 0. 25、 0. 5、 1 μmol / L 组和右美托咪定 (dexmedetomidine, Dex) 100 μg / kg 组。 Hematoxylin-eosin (H&E) 染色评估肺组织的组织病理学变化; ELISA 法测定肺组织中髓过 氧化物酶 (myeloperoxidase, MPO)、 丙二醛 ( malondialdehyde, MDA)、 超氧化物歧化酶 ( superoxide dismutase, SOD) 和谷胱甘肽过氧化物酶 ( glutathione peroxidase, GSH-Px) 的活性; 检测血清中 IL-6、 IL-1β 和肿瘤坏死因子-α (tumor necrosis factor-α, TNF-α) 的表达; Western 印迹检测 HMGB1 / NF-κB 通路相关蛋 白的表达。 结果 与对照组比较, LPS 诱导肺泡外膜增厚、 出血和肺水肿; 肺损伤评分和肺含水量增加; MPO 和 MDA 活性增加, SOD 和 GSH-Px 水平降低; IL-6、 IL-1β 和 TNF-α 水平升高; HMGB1 蛋白和 NF-κB P65 磷酸化水平升高, 有显著性差异 (P< 0. 05)。 与 LPS 组比较, 罗哌卡因 0. 5、 1 μmol / L 组小鼠肺损伤 程度明显减轻; MPO 和 MDA 活性降低, SOD 和 GSH-Px 水平升高; IL-6、 IL-1β 和 TNF-α 水平降低; HMGB1 蛋白和 NF-κB P65 磷酸化水平降低, 有显著性差异 (P< 0. 05)。 结论 罗哌卡因通过抑制 HMGB1 / NF-κB 通路, 有效减弱了 LPS 引起的肺组织损伤。     

Soluble TNF-�� Receptor I Encoded on Plasmid Vector and Its Application in Experimental Gene Therapy of Radiation-Induced Lung Fibrosis

Post-radiation inflammatory reaction leads to an irreversible pulmonary fibrosis which may cause lethal respiratory insufficiency. Pathological inflammatory and fibrotic changes might be attenuated by inhibiting tumour necrosis factor (TNF)-α activity using TNF-α soluble receptors. Thus, an experimental antifibrotic gene therapy with the plasmid vector encoding a mouse soluble receptor I for TNF-α (psTNFR-I) was assessed. Soluble TNFR-I encoding gene was cloned into pcDNA3.1 plasmid. The ability of psTNFR-I expressing vector to transfect cells, and its biological activity in vitro and in vivo were examined by PCR, RT-PCR, MTT assay and ELISA. The C57Bl/6J mice received single intramuscular injection of psTNFR-I, conjugated with polyetylenimine (PEI) 25 kDa, equally divided to both hind legs, 3 days before irradiation (20 Gy, Co60), and either a single injection or ten injections once a week after irradiation. The data proved the effectiveness of psTNFR-I product to neutralise TNF-α activity in vitro. The in vivo plasmid incorporation and maintenance was confirmed. Measurements of plasma soluble TNFR-I levels showed that the in vivo gene transfer was effective. PEI was found to enhance transfection efficiency in vivo. The psTNFR-I/PEI complexes caused no toxicity in the transfected mice. C57Bl/6J mice that received prolonged psTNFR-I/PEI injections developed lethal fibrotic syndrome and died 8 weeks later than the mice treated with a double plasmid injection and the control mice treated with a control plasmid. Sequential administration of soluble TNFR-I by a nonviral, intramuscular gene transduction in the early and late post-radiation inflammatory phase prolonged survival of irradiated mice and attenuated the symptoms of lung fibrosis. The psTNFR-I gene transduction may provide a safe and simple method to partially neutralise TNF-α activity and prevent radiation-induced lung injury.     

miRNA-148a对乙型肝炎小鼠的保护作用

目的探讨miR-148a对乙型肝炎模型小鼠肝功能的影响。方法40只SPF级C57BL/6小鼠(20-25 g)随机分为对照组、模型组、miRNA-148a mimics及miRNA-148a inhibitor组,每组10只。除对照组外,其余各组小鼠均建立慢性乙型肝炎模型,利用尾静脉注射pAAV/HBV1.3表达质粒的方法构建乙型肝炎小鼠模型。待模型成功后,将miRNA-148a mimics、miRNA-148a inhibitor经尾静脉注射到乙型肝炎模型小鼠体内,3周后利用Real-time PCR检测血清中miRNA-148a表达水平、乙肝病毒的脱氧核糖核酸(HBV-DNA)水平;利用试剂盒检测肝功能相关指标天门冬氨酸氨基转移酶(AST),丙氨酸氨基转移酶(ALT)、γ-谷氨酰转肽酶(γ-GT)、总胆红素(TBIL);ELISA检测C反应蛋白(CRP)及炎症因子肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)的水平变化。结果miRNA-148a mimics组与模型组相比,miRNA-148a表达水平明显增加,血清中HBVDNA水平降低,AST、ALT、γ-GT、TBIL及CRP水平明显降低(P<0.05),且炎症因子TNF-α和IL-6水平也明显降低(P<0.05)。miRNA-148a inhibitor能显著降低miRNA-148a的表达水平并增加小鼠血清中HBV-DNA水平,同时,AST,ALT,γ-GT,TBIL,CRP水平及炎症因子TNF-α和IL-6水平显著增加(P<0.05)。结论MiRNA-148a能够改善乙型肝炎小鼠肝功能,抑制炎症因子的表达,发挥保护肝脏的作用。