简介：<正>Uponactivation,naiveT-helpercellscandifferentiateintotwomajordistinctsubsets,Thelper1(Th1)andThelper2(Th2),asdefinedbytheireffectorfunctionsandcytokinesecretionpatterns.CytokinemilieuandcostimulatorymoleculeshavebeenshowntoplayanessentialroleindeterminingThelperdifferentiation.However,itisstillunclearhowtheeffectsofsignalsofco-stimulatorymoleculesandcytokinesareexertedduringThelperdifferentiation.Weshowevidencesuggestingthatwhilecytokinesignalsinitiatedifferentiationprogram,theselectiveactionofdeatheffectorsdeterminestheendpointbalanceofdifferenti-

简介：目的观察马齿苋及其不同提取部位对改善2型糖尿病大鼠胰岛素抵抗糖脂代谢紊乱的影响。方法应用小剂量链脲佐菌素加高热量饲养的方法建立实验性2型糖尿病大鼠模型，随机分为模型组、马齿苋组、马齿苋MH部位组、马齿苋MS部位组及多烯康对照组，并设正常对照组，各组大鼠相应地给与灌胃治疗12周；检测各组糖代谢及脂代谢血生化指标。结果糖代谢方面，马齿苋组能明显改善实验性2型糖尿病大鼠糖耐量异常，FINS明显低于模型组，相应地ISI显著提高；马齿苋MH部位具有改善实验性2型糖尿病大鼠糖耐量异常的趋势，FINS水平有所下降，ISI有所增加，与模型组比较接近统计学意义；而马齿苋MS部位对2型糖尿病大鼠糖耐量异常影响不大，改善胰岛素作用不明显。脂代谢方面，马齿苋组与模型组比较，显著升高血清HDL-C水平，同时降低血清TC、TG和FFA水平。马齿苋MH部位与模型组比较，显著降低血清TG水平，同时降低血清TC和FFA水平，但升高血清HDL-C水平不明显。马齿苋MS部位与模型组比较，显著降低血清FFA水平，降低血清TG接近统计学意义，但对血清TC和HDL-C水平无明显影响。结论马齿苋能明显改善2型糖尿病大鼠胰岛素抵抗糖代谢异常。马齿苋MH部位具有改善糖代谢的趋势，而马齿苋MS部位对糖代谢的影响不明显。马齿苋及其马齿苋MH部位、马齿苋MS部位对2型糖尿病大鼠胰岛素抵抗脂代谢异常均有明显的改善作用，但其侧重点各有不同，可能与其作用环节和机制不同有关。

简介：Plasmamembrane(PM)Ca^2+-ATPaseactivityinpoplarapicalbudmeristematiccellsduringshort-day(SD)-induceddormancydevelopmentwasexaminedbyaceriumprecipitationEM-cytochemicalmethod.Ca^2+-ATPaseactivity,indicatedbythestatusofceriumphosphateprecipitatedgrains,waslocalizedmainlyontheinteriorface(cytoplasmicside)ofthePMwhenplantsweregrownunderlongdaysandreachedadeepdormancy.Afewreactionproductswerealsoobservedonthenuclearenvelope.Whenplantbudsweredevelopingdormancyafter28to42dofSDexposure,almostnoreactionproductswerepresentontheinteriorfaceofthePM.Incontrast,alargenumberofceriumphosphateprecipitatedgrainsweredistributedontheexteriorfaceofthePM.After70dofSDexposure,whenbudshaddevelopedadeepdormancy,thereactionproductsofCa^2+-ATPaseactivityagainappearedontheinteriorfaceofthePM.TheresultsseemedsuggestingthattwokindsofCa^2+-ATPasesmaybepresentonthePMduringtheSD-induceddormancyinpoplar.OneistheCa^2+-pumpingATPase,whichislocatedontheinteriorfaceofthePM,formaintainingandrestoringtheCa^2+homeostasis.Theothermightbeandecto-Ca^2+-ATPase,whichislocatedontheexteriorfaceofthePM,fortheexocytosisofcellwallmaterialsassuggestedbythefactofthecellwallthickeningduringthedormancydevelopmentinpoplar.

简介：中国生理学会第２１届理事会第一次会议于２００２年１０月１７日在福建省南平市公安局疗养院召开，王晓民秘书长主持了会议。

简介：今天，来自全国各地的５００多位生理学工作者聚集在风景秀美的武夷山，在２ｌ世纪的曙光的普照下，隆重举行中国生理学会第２ｌ届代表大会暨学术会议。首先，请允许我代表中国生理学会第２０届常务理事会，向各位来宾和代表表示热烈的欢迎！Ｏｕｒ　ｓｐｅｃｉａｌ　ｗｅｌｃｏｍｅ　ｉｓ　ｅｘｔｅｎｄｅｄ　ｔｏ　ｏｕｒ　ｇｕｅｓｔｓ　ｆｒｏｍ　ａｂｒｏａｄ，‘Ｐｒｏｆｓ．Ｊｏｈｎ　Ｎｉｃｈｏ１１ｓ　ａｎｄ　Ｗａｎｇ　Ｊｉａｎ—Ｙｉｎｇ．他们将分别作第二届冯德培纪念讲座和第一届王志均纪念讲座。

简介：中国生理学会第２ｌ届全国代表大会暨学术会议于２００２年１０月１４—１９日在福建省南平市公安局疗养院胜利召开。会议的主要议题是举行全国会员代表大会，听取和讨论第２０届理事会工作报告、修改学会章程、改选理事会，同时举行学术会议。这是２ｌ世纪我会召开的第一次大型盛会，共有近６００人参加了大会，包括来自香港的代表４人、来自台湾的来宾１人和来自美国，日本，意大利和澳大利亚等国的同行８人。出席大会人数之多，在中国生理学会历史上是空前的，显示了中国生理学生机勃勃、欣欣向荣的大好形势。

简介：本研究首次用RT-PCR技术分两段扩增了我国猪瘟病毒(HCV)标准强毒石门株的主要保护性抗原E2基因,并将其进行了克隆和序列分析。将这两个片段连接成完全的E2基因,并将其克隆到原核表达载体pBV220和pET-28a(+)中,重组表达载体转化、诱导的受体菌经Western印迹和直接ELISA检测能够表达E2抗原。用RT-PCR技术对从我国多个地区收集的猪瘟病料进行检测,结果从吉林、长春、南京、重庆、昆明、佛山病料中扩增出了HCVE2保

简介：目的通过观察左归丸含药血清对成骨细胞白细胞介素-1（IL-1）、白细胞介素．6（IL-6）和环加氧酶-2（COX-2）表达的影响，探讨其治疗骨质疏松症的作用机制。方法体外分离、培养成骨细胞，实验分为3组：正常血清组、卵巢切除（OVX）血清组和OVX含药血清组。采用免疫组化法，检测成骨细胞IL-1、IL-6和COX-2的表达。结果OVX血清组成骨细胞IL-1、IL-6和COX-2的表达明显强于正常血清组，而OVX含药血清组的表达较OVX血清组明显减弱，与正常血清组比较，则无显著性差异。结论在去势状态下，左归丸可能是通过抑制成骨细胞IL-1、IL-6和前列腺素E2（PGE2）的分泌，进而达到治疗骨质疏松的作用。

简介：中国生理学会第２ｌ届常务理事会第一次会议于２００２年ｌ0月１７日在福建省南平市公安局疗养院举行，当选的常务理事除了一人请假外全部出席。姚泰理事长主持了会议。会议对今后的工作做了具体安排，并就有关问题进行了讨论。

简介：Amurinemacrophage-likecelllineJ774,acquired,inresponsetoLPS,anabilitytokilltumornecrosisfactor(TNF)-insensitivetargetP815mastocytomacellswhereasanothercellline,P388D1didnot,LPStriggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference,TheresultswhowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2(PLCandPLA2)toapproximatelythesameextent.ThemaximumresponseoftothenzymesofJ774cellswasnotedwithin10minthetreatmentwhereasthatofP388D1cellsrequiredmorethan20min,TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,includingActivationofPLCandPLA2andPKCinmacrophagesbyLPS.Ca2+augmentationofenzymeactivation,participationofguaninenucleotidebinding(G)proteinsintheinitialactivationpreocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpertussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities.J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform,Nevertheless,thequestionwhyJ774cellsbutnotP388D1cells,canacquirethetumoricidalactivity,aganistP815,cellsfollowingLPStreatmentrematinstobeanswered.

简介：Amurinemacrophage-likecellline,J774,acquried,inresponsetoLPS,anabilitytokilltumornecrosisfactor（TNF）-insensitivetargetP815mastocytomacells,whereasanothercellline,P388D1,didnot.LPS-triggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference.TheresultsshowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2（PLCandPLA2）toapproximatelythesameextent.ThemaximumresponseofbothenzymesofJ774cellswasnotedwithin10minofthetreatment,whereasthatofP388D1cellsrequiredmorethan20min.TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,ineludingActivationofPLCandPLA2andPKCinmacrophagesbyLPSCa2+augmentationofenzymeactivation,participationofguaninenucleotidebinding（G）proteinsintheinitialactivationprocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpartussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities,J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform.Nevertheless,thequestionwhyJ774cells,butnotP388D1cells,canacquirethetumoricidalactiyity,aganistP815cellsfollowingLPS-treatmentremainstobeanswered.

简介：OverexpressionandactivationofHER-2/neu(alsoknownasc-erbB-2),aproto-oncogene,wasfoundinabout30%ofhumanbreastcancers,promotingcancergrowthandmakingcancercellsresistanttochemo-andradio-therapy.Wild-typep53iscrucialinregulatingcellgrowthandapoptosisandisfoundtobemutatedordeletedin60-70%ofhumancancers.Andsomecancerswithawild-typep53donothavenormalp53function,suggestingthatitisimplicatedinacomplexprocessregulatedbymanyfactors.Inthepresentstudy,weshowedthattheoverexpressionofHER-2/neucoulddecreasetheamountofwild-typep53proteinviaactivatingPI3Kpathway,aswellasinducingMDM2nucleartranslocationinMCF7humanbreastcancercells.BlockageofPI3KpathwaywithitsspecificinhibitorLY294002causedG1-Sphasearrest,decreasedcellgrowthrateandincreasedchemo-andradio-therapeuticsensitivityinMCF7cellsexpressingwild-typep53.However,itdidnotincreasethesensitivitytoadriamycininMDA-MB-453breastcancercellscontainingmutantp53.OurstudyindicatesthatblockingPI3KpathwayactivationmediatedbyHER-2/neuoverexpressionmaybeusefulinthetreatmentofbreasttumorswithHER-2/neuoverexpressionandwild-typep53.

简介：本文作者已有的研究结果证明,完整的人干细胞生长因子(hSCGF)没有种属特异性,即可以作用于小鼠骨髓造血细胞.这一点与在Ca2+依赖糖识别结构域(CRD)缺失了78个氨基酸残基的截短分子(hSCGFβ)有所不同.本研究从hSCGF全长cDNA中完全删除了CRD结构域编码序列,进一步探讨CRD结构域的生物学功能.由于该突变体序列GC含量较高,因此将该缺失突变体序列克隆在GST融合表达载体中进行融合表达.通过低温(28℃)诱导,表达产物主要以可溶蛋白的形式存在.利用亲和层析纯化CRD结构域完全缺失的hSCGF突变体融合蛋白,通过检测重组突变分子的协同刺激造血活性有无改变来初步探讨CRD结构域在hSCGF分子中的生物学功能.研究结果表明,去掉完整CRD结构域的突变分子仍然具有造血刺激活性.据此推断CRD结构域在hSCGF分子中可能对于受体配体结合起辅助作用.