简介：AIMToinvestigatetherolesandinteractionsofmutThomolog（MTH）-1andhypoxia-induciblefactor（HIF）-1αinhumancolorectalcancer（CRC）.METHODS：TheexpressionanddistributionofHIF-1αandMTH-1proteinsweredetectedinhumanCRCtissuesbyimmunohistochemistryandquantitativerealtimepolymerasechainreaction（qRT-PCR）.SW480andHT-29cellswereexposedtonormoxiaorhypoxia.ProteinandmRNAlevelsofHIF-1αandMTH-1wereanalyzedbywesternblottingandqRT-PCR,respectively.InordertodeterminetheeffectofHIF-1αontheexpressionofMTH-1andtheamountof8-oxodeoxyguanosinetriphosphate（dGTP）inSW480andHT-29cells,HIF-1αwassilencedwithsmallinterferingRNA（siRNA）.GrowthstudieswereconductedoncellswithHIF-1αinhibitionusingaxenografttumormodel.Finally,MTH-1proteinwasdetectedbywesternblottinginvivo.RESULTS：HighMTH-1mRNAexpressionwasdetectedin64.2%ofcases（54/84）,andthiswassignificantlycorrelatedwithtumorstage（P=0.023）andsize（P=0.043）.HIF-1αproteinexpressionwascorrelatedsignificantlywithMTH-1expression（R=0.640;P〈0.01）inhumanCRCtissues.HypoxicstressinducedmRNAandproteinexpressionofMTH-1inSW480andHT-29cells.InhibitionofHIF-1αbysiRNAdecreasedtheexpressionofMTH-1andledtotheaccumulationof8-oxo-dGTPinSW480andHT-29cells.Intheinvivoxenografttumormodel,expressionofMTH-1wasdecreasedintheHIF-1αsiRNAgroup,andthetumorvolumewasmuchsmallerthanthatinthemocksiRNAgroup.CONCLUSION：MTH-1expressioninCRCcellswasupregulatedviaHIF-1αinresponsetohypoxicstress,emphasizingthecrucialroleofHIF-1α-inducedMTH-1intumorgrowth.

简介：程序性死亡分子-1（PD-1）是T淋巴细胞膜表面表达的负向协同刺激分子，与其主要配体（PD-L1）形成通路后，可以减弱T淋巴细胞的免疫反应，甚至导致T淋巴细胞功能衰竭。PD-1／PD-L1信号通路在乙型肝炎病毒感染后的效应T细胞免疫耐受中具有重要作用，阻断该途径可能是抗病毒治疗的方向之一，具有良好的应用前景。

简介：肠梗阻是外科常见的病症,而机械性肠梗阻尤为多见。因食用水果造成机械性肠梗阻,进而发展为绞窄性肠梗阻导致肠管坏死的病例,目前国内罕有报道。我院曾收治1例老年男性患者因杏核导致的回肠坏死,现报道如下。

简介：病例：患者女,42岁,已婚已育.因“间断性下腹痛伴黏液血便3年,加重2个月”于2013年11月2日收治入院.入院时一般情况可,大便1次/d,排出不畅,带黏液血便.查体：心肺未见异常,腹平软,下腹部见纵形手术瘢痕,无压痛、反跳痛,未扪及腹部包块,移动性浊音（-）.肛检示距肛门口约4～5cm处截石位12～2点可及一隆起灶,质硬、固定,表面欠光滑,结节状,局部压痛,指套染淡红色血迹和黏液.实验室检查：血尿常规、肝肾功能电解质、肿瘤指标CA125、CEA无异常,粪隐血试验（＋）.心电图、胸片、上腹部CT未见异常.

简介：AIM:Toanalyzethemismatchrepair(MMR)statusandtheARID1Aexpressionaswellastheirclinicopathologicalsignificanceingastricadenocarcinomas.METHODS:WeexaminedtheexpressionsofMMRproteinsandARID1Abyimmunohistochemistryinconsecutive489primarygastricadenocarcinomas.Theresultswerefurthercorrelatedwithclinicopathologicalvariables.RESULTS:ThelossofanyMMRproteinexpression,indicativeofMMRdeficiency,wasobservedin38cases(7.8%)andwassignificantlyassociatedwithanolderage(68.6±9.2vs60.4±11.7,P<0.001),afemalesex(55.3%vs31.3%,P=0.004),anantrallocation(44.7%vs25.7%,P=0.021),andadifferentiatedhistology(57.9%vs39.7%,P=0.023).AbnormalARID1Aexpression,includingreducedorlossofARID1Aexpression,wasobservedin109cases(22.3%)andwassignificantlycorrelatedwithlymphaticinvasion(80.7%vs69.5%,P=0.022)andlymphnodemetastasis(83.5%vs73.7%,P=0.042).ThetumorswithabnormalARID1AexpressionmorefrequentlyindicatedMMRdeficiency(47.4%vs20.2%,P<0.001).AmultivariateanalysisidentifiedabnormalARID1Aexpressionasanindependentpoorprognosticfactor(HR=1.36,95%CI:1.01-1.84;P=0.040).CONCLUSION:OurobservationssuggestthattheAIRD1Ainactivationisassociatedwithlymphaticinvasion,lymphnodemetastasis,poorprognosis,andMMRdeficiencyingastricadenocarcinomas.

简介：背景：研究表明神经肽S受体1（NPSR1）基因多态性与欧洲人群炎症性肠病（IBD）的遗传易感性相关，但尚无研究探讨两者在中国人群中的相关性。目的：探讨中国汉族人群中NPSR1基因多态性与IBD的关系。方法：收集武汉大学中南医院457例确诊IBD患者[溃疡性结肠炎（UC）组355例，克罗恩病（CD）组102例]和500名健康对照者，以PCR和测序技术分析NPSR1基因rs323922（C→G突变）、rs740347（G→C突变）位点多态性。结果：UC组与对照组间、CD组与对照组间rs323922、rs740347位点的基因型频率和等位基因频率差异均无统计学意义（P〉0.05）。基因型与IBD临床表型的相关性分析显示：①rs323922位点突变型CG基因型与男性CD（OR：0.441，95%CI：0.230~0.844）和结肠型CD（OR：0.425，95%CI：0.199~0.911）相关，为保护因素。②rs740347位点突变型CC基因型与CD早期发病（〈16岁）相关（OR：15.019，95%CI：2.634~86.470），突变型C等位基因与结肠型CD相关（OR：2.142，95%CI：1.709~4.294），两者均为危险因素。结论：NPSR1基因rs323922、rs740347位点多态性与中国汉族人群的IBD遗传易感性无关，但与IBD的某些临床表型有关。