简介:Wiskott-Aldrich综合征(Wiskott-Aldrichsyndrome,WAS)是一种少见的X连锁隐性遗传性疾病,以湿疹、血小板减少、联合免疫缺陷为特征,多数在婴幼儿期发病。1994年导致WAS的缺陷基因被克隆出来,其位于X染色体短臂着丝点周围Xp11.22-23,该基因翻译表达的蛋白质称为WASp[1]。本文报道1例特殊的基因突变。1病例资料患儿男,4个月。以间断腹泻3个月,发热、血小板减少2月余入院。
简介:基于轻质、高强和耐磨等诸多优势,铝基碳化硼复合材料已成为集结构/功能一体化的新型材料。本文采用粉末冶金及轧制方法,制备出厚度3.5mm、碳化硼质量分数为33%的B4C/Al复合材料板材,并对其疲劳性能和断裂机制进行分析。在1×107循环次数下,铝基碳化硼复合材料板材的疲劳强度达到110MPa。采用SEM对疲劳断口进行观察,结果表明B4C/Al复合材料疲劳断口可清楚的看到裂纹的萌生、扩展和失稳断裂的典型特征,但存在多种形式的疲劳启裂源。疲劳裂纹扩展路径取决于裂纹尖端塑性区的半径和B4C颗粒的间距大小,当增强颗粒的间距小于塑性区半径时,裂纹主要沿着颗粒的连接界面或断裂的碳化硼颗粒扩展,当增强颗粒的间距大于塑性区半径时,有利于裂纹尖端钝化,减缓裂纹的扩展和方向改变。
简介:Objective:TheresultsofapreviousstudyshowedthatacleardysregulationwasevidentintheglobalgeneexpressionoftheBCL11A-suppressedB-lymphomacells.Inthisstudy,thebonemorphogeneticproteinreceptor,typeII(BMPR2),E1Abindingproteinp300(EP300),transforminggrowthfactor-β2(TGFβ2),andtumornecrosisfactor,andalpha-inducedprotein3(TNFAIP3)geneexpressionpatternsinB-cellmalignancieswerestudied.Methods:TherelativeexpressionlevelsofBMPR2,EP300,TGFβ2,andTNFAIP3mRNAinB-lymphomacelllines,myeloidcelllines,aswellasincellsfromhealthyvolunteers,weredeterminedbyreal-timequantitativereversetranscriptpolymerasechainreaction(qRT-PCR)withSYBRGreenDye.Glyceraldehyde-3-phosphatedehydrogenase(GAPDH)wasusedasreference.Results:TheexpressionlevelofTGFβ2mRNAinB-lymphomacelllineswassignificantlyhigherthanthoseinthecellsfromthehealthycontrol(P<0.05).However,theexpressionlevelofTNFAIP3mRNAinB-malignantcellswassignificantlylowerthanthatofthehealthycontrol(P<0.05).TheexpressionlevelsofBMPR2andEP300mRNAshowednosignificantdifferencebetweenB-malignantcelllinesandthehealthygroup(P>0.05).InB-lymphomacelllines,correlationanalysesrevealedthattheexpressionofBMPR2andTNFAIP3(r=0.882,P=0.04)hadsignificantpositiverelation.TheexpressionlevelsofBMPR2,EP300,andTNFAIP3mRNAincelllinesfrommyeloidleukemiaweresignificantlylowerthanthoseinthecellsfromthehealthycontrol(P<0.05).TheexpressionlevelsofTGFβ2mRNAshowednosignificantdifferencebetweenmyeloidleukemiacelllinesandthehealthycontrolorB-malignantcelllines(P>0.05).TheexpressionlevelsofBMPR2,EP300,andTNFAIP3mRNAinB-lymphomacellsweresignificantlyhigherthanthoseofthemyeloidleukemiacells(P<0.05).Conclusion:DifferentexpressionpatternsofBMPR2,EP300,TGFβ2,andTNFAIP3genesinB-lymphomacellsexist.更多还原
简介:APt-MoO3/Ccatalyst,aimedtoeliminatetheharmfuleffectofsulfurdioxide(SCb)ontheperformanceofPtnanoparticles(NPs)forcatalysisofoxygenreductionreaction(ORR)inprotonexchangemembranefuelcells(PEMFC),isdevelopedandcharacterizedbyTEM,XRDandXPS.TheresultsrevealthatPt-MoO3/Ccatalystexhibitsnotonlyahighercatalyticactivity,butalsoabetterSO2poisoningresistanceandabetterrecoveryperformancethanthecommercialPt/Ccatalystdoes.
简介:Objective:TodeterminewhetherInterferon-alpha-2b(IFN-α2b)canmodulatetheautophagicresponseinhepatocellularcarcinomacells.Methods:HepatocellularcarcinomacellsweretreatedwithIFN-α2b.Autophagywasassessedbyacridineorangestaining,GFP-LC3dottedassay,transmissionelectronmicroscopyandimmunoblotting.Results:AcridineorangestainingshowedthatIFN-α2btriggeredtheaccumulationofacidicvesicularandautolysosomesinHepG2cells.TheacridineorangeHepG2cellratioswere(4.3±1.0)%,(6.9±1.4)%,and(13.1±2.3)%,respectively,aftertreatmentwith100,1,000,and10,000IU/mLIFN-α2bfor48h.AmarkedlypunctatepatternwasobservedinHepG2cellstreatedwith10,000IU/mLIFN-α2bfor48h,butonlydiffuseandweaklyfluorescentGFP-LC3punctawasobservedincontrolcells.HepG2cellstreatedwith10,000IU/mLIFN-α2bfor48hdevelopedautophagosome-likecharacteristics,includingsingle-ordouble-membranevacuolescontainingintactanddegradedcellulardebris.TheBeclin1andLC3-IIproteinexpressionwasup-regulatedbyIFN-α2btreatment.Conclusion:Autophagycanbeinducedinadose-dependentmannerbytreatmentwithIFN-α2binHepG2cells,andtheBeclin1signalingpathwaywasstimulatedbyIFN-α2b.
简介:Alzheimer’sdisease(AD)isoneofthemostdevastatingdiseasesaffectingthelifeandhealthofagingpopulation.TwohallmarksofADaresenileplaquesandneurofibrillarytangles,andADiswellknownforthemassivelossofneuronsandimpairedcognitivefunctionsespeciallymemoryloss.Despiteextensivesearchforeffectivetreatment,available
简介:目的:观察电针对吗啡戒断大鼠空间学习记忆能力及前额叶皮质NR2B(N-甲基-D-天门冬氨酸受体NR2B亚单位)表达的影响,探讨电针治疗药物戒断后学习记忆损害的分子生物学机制。方法:选用雄性SD大鼠36只,随机分为空白组、模型组、模型加针刺组(针刺组)及模型加电针组(电针组),每组各9只。除空白组外,其余各组大鼠采用逐日增量法背部皮下注射盐酸吗啡注射液,末次注射后3h给予纳络酮快速戒断,建立吗啡戒断大鼠模型。造模成功后选取双侧"肾俞""足三里"穴,分别采用针刺及电针方法治疗,15min/次,1次/日,连续6d。采用Morris水迷宫测试大鼠空间学习记忆能力,应用WesternBlot及RT-PCR测定前额叶皮质NR2B蛋白与基因的表达水平。结果:水迷宫定位航行测试中,与空白组比较,模型组、针刺组及电针组大鼠逃避潜伏期明显延长(P〈0.01);与模型组比较,针刺组、电针组大鼠逃避潜伏期明显缩短(P〈0.01);与针刺组比较,电针组大鼠逃避潜伏期缩短(P〈0.05)。空间探索测试中,与空白组比较,模型组、针刺组及电针组穿越平台次数减少(P〈0.01);与模型组比较,针刺组穿越平台次数增多(P〈0.05),电针组显著增多(P〈0.01)。前额叶皮质NR2B蛋白表达,与空白组比较,模型组蛋白表达减少(P〈0.01)。与模型组比较,针刺组和电针组蛋白均升高(P〈0.01),电针组表达高于针刺组(P〈0.01)。前额叶皮质NR2BmRNA表达,戒断后大鼠表达下降(P〈0.05),与模型组相比,电针组大鼠表达上调(P〈0.05),针刺组上调改变无统计学意义(P〉0.05)。结论:针刺和电针均可以改善戒断后大鼠空间学习记忆能力,且电针效果优于针刺治疗,其机制可能与对前额叶皮质脑区NR2B表达的调节有关。
简介:摘要目的探讨DL-C-BⅡ超短波治疗机治疗腰椎间盘突出症的临床疗效。方法选择80例腰椎间盘突出症患者,随机分为观察组和对照组各40例;对照组常规予以绝对卧床休息、持续牵引、理疗推拿按摩糖皮质激素硬膜外注射,髓核化学溶解法,非甾体类消炎镇痛药、解痉、消除神经根水肿等治疗,治疗组在此基础上加用DL-C-BⅡ超短波电疗机治疗,2次/天。对比两组腰椎间盘突出症马尾综合症、肌肉瘫痪和疼痛分级变化。结果观察组治疗24h后疼痛评分(1.6±0.9)分,对照组为(2.1±1.0)分,观察组治疗24小时后疼痛评分明显低于对照组(P<0.05);观察组肌力下降明显缓解时间(21±2.0)天,对照组为(24±4.4)天,观察组肌力下降明显缓解时间显著低于对照组(P<0.05)。结论DL—C—BⅡ超短波治疗机治疗腰椎间盘突出症疗效较好。
简介:目的探讨GustiloⅢB、ⅢC型小腿及足踝部开放性骨折一期修复与重建的临床疗效及手术要点.方法回顾性分析2001年1月至2012年4月收治的160例GustiloⅢB、ⅢC型小腿及足踝部开放性骨折患者,男103例,女57例;平均年龄为36.3岁.骨折部位及Gustilo分型:胫骨干113例(ⅢB型91例,ⅢC型22例),胫骨远端4例(ⅢB型3例,ⅢC型1例),足踝部43例(ⅢB型37例,ⅢC型6例).受伤至手术时间为3~37h,平均12.7h.彻底清创后应用穿支皮瓣、皮神经营养血管皮瓣、传统轴型皮瓣及肌皮瓣、局部皮瓣一期修复关键创面,选择外固定支架(121例)、钢板(20例)、螺钉或克氏针(14例)及髓内钉(5例)确定性固定骨折,同时完成其他必要的肢体结构及功能重建.结果本组患者平均住院时间为28.0d(9~76d),关键创面均经初次手术获得修复.除1例GustiloⅢC型胫腓骨骨折患者因主诉伤肢持续性疼痛而截肢外,其余159例保肢成功患者术后获12~83个月(平均21.3个月)随访.随访期间均未发生严重或持续的骨感染,骨性愈合时间为6~19个月(平均11.7个月),肢体功能、外形恢复满意.结论应用标准的修复重建外科技术及骨折固定技术一期修复与重建GustiloⅢB、ⅢC型小腿及足踝部开放性骨折可显著缩短治疗周期,减少并发症;新鲜创面解剖清晰,手术更为灵活;仅修复关键创面可减少供区牺牲,避免外形臃肿.