连翘提取物对小鼠T淋巴细胞体外活化与增殖的影响

目的:分析连翘(FS)提取物对小鼠淋巴结T细胞的体外活化与增殖的影响,初步探讨其免疫抑制作用机制.方法:无菌分离小鼠淋巴结细胞,加入多克隆刺激剂刀豆蛋白A(ConA)进行刺激,利用荧光标记的单克隆抗体(mAb)染色结合流式细胞术(FCM),检测小鼠T淋巴细胞的表达的活化抗原CD69、CD25、CD71的表达情况;以羧基荧光素乙酰乙酸琥珀酰亚胺酯(CFDA-SE)染色,以FCM分析FS对淋巴细胞体外增殖的影响.结果:终浓度为40、80、160 mg/L的FS均对ConA刺激诱导的T细胞CD69、CD25和CD71的表达有降低作用(P＜0.05).CFDA-SE染色分析显示,上述浓度的FS对ConA诱导的小鼠T淋巴细胞增殖具有抑制作用(P＜0.05).结论:FS对ConA诱导的T细胞早、中、后期活化和体外增殖有抑制作用.     

橙皮素对小鼠T淋巴细胞体外活化与增殖的影响

目的:研究橙皮素(Hes)对小鼠T细胞体外活化和增殖的影响,并探讨其作用机制.方法:用ConA刺激小鼠淋巴结来源的淋巴细胞,以不同终浓度Hes与T细胞共培养,利用荧光标记抗体双染色结合流式细胞术(FCM),检测各药物浓度Hes对ConA诱导的小鼠T细胞表达早期活化抗原CD69的作用;以酶标仪结合MTT比色法检测Hes药物的细胞毒性和对ConA诱导的小鼠淋巴结来源的淋巴细胞增殖的影响;以羧基荧光素乙酰乙酸(CFDA-SE)染色结合FCM检测Hes对ConA诱导的小鼠T细胞增殖的作用,并应用ModFit软件分析其增殖指数(PI).结果:淋巴细胞的存活率说明0.2 mL/L DMSO和25～75 μmol/L范围内的Hes对小鼠T淋巴细胞无毒副作用;MTT法、CFDA-SE法、双抗体染色法检测Hes对ConA诱导的小鼠T淋巴细胞的增殖和活化结果均显示,终浓度为25、50、75 μmol/L的Hes对ConA诱导的小鼠T淋巴细胞的增殖和活化均有抑制作用且呈剂量依赖关系.结论:有望通过进一步的研究将Hes发展为免疫抑制药物.     

紫杉醇对小鼠T细胞的影响

为研究抗癌药紫杉醇(PTX)对T细胞行为的影响及其分子机制,利用流式细胞术分析多克隆刺激剂ConA刺激下T细胞行为:羧基荧光素乙酰乙酸琥珀酰亚胺酯(CFSE)标记技术分析T细胞增殖相关指数;碘化丙锭染色分析细胞周期分布;AnnexinV-PI染色检测T细胞凋亡;荧光标记的单克隆抗体染色检测T细胞活化表达CD25的百分率。结果显示.PTX对ConA刺激下小鼠T细胞增殖具有明显的抑制作用,且呈剂量依赖性。该浓度范围PTX阻滞T细胞于G2/M期,诱导凋亡及抑制CD25表达。25nmol/L的PTX与10nmol/L的环孢素A(CsA)具有明显的协同抑制效应。以上结果表明PTX可明显抑制多克隆刺激剂ConA诱导的T细胞体外增殖,是G2/M期阻滞、凋亡诱导和CD25表达抑制等多种机制共同作用的结果。     

米诺环素对小鼠T淋巴细胞体外活化和增殖的影响

研究米诺环素(MNC)对刀豆蛋白A(ConA)刺激的小鼠T细胞体外活化和增殖的影响,并对其免疫调节作用进行初步探讨。以ConA刺激小鼠淋巴结来源的淋巴细胞,以不同终浓度的MNC与T细胞共培养,荧光抗体染色结合流式细胞术,检测T细胞早期活化抗原CD69的表达;用羧基荧光素双醋酸盐琥珀酰(CFDA-SE)染色结合流式细胞术,并用ModFit软件分析T细胞增殖相关指数。结果:终浓度为10、25和50μmol/L的MNC显著抑制ConA诱导的T细胞CD69的表达,由ConA组的71.20%±1.08%,分别降低为64.43%±1.39%、53.34%±1.26%和33.65%±1.91%;CFDA-SE染色结果显示,培养48 h和72 h的ConA组T细胞的增殖指数(PI)分别为1.57±0.03和2.06±0.02,各浓度的MNC对ConA刺激的T细胞增殖具有明显的抑制作用,以50μmol/L的MNC抑制作用最明显,48 h和72 h的PI分别为1.01±0.02和1.03±0.01,与相应时间的对照组比较,均有统计学意义(P<0.01)。MNC能有效地抑制小鼠T细胞的体外活化和增殖。具有独立于其抗菌活性的抗炎作用。     

ConA对CD4~+CD25~+调节性T细胞早期活化和功能的影响

目的:观察常用丝裂原ConA对CD4+CD25+调节性T细胞抑制功能的影响与早期活化标志CD69之间的关系。方法:用免疫磁珠分离BALB/c小鼠脾脏CD4+CD25+调节性T细胞、CD4+CD25-效应性T细胞,加入不同浓度的ConA,12 h后收集细胞,流式细胞术分析其CD69的表达。CFSE标记CD4+CD25-效应性T细胞,按2∶1比例与CD4+CD25+调节性T细胞共同培养,培养同时加ConA,3 d后流式细胞仪分析ConA对CD4+CD25+调节性T细胞抑制CD4+CD25-效应性T细胞增殖的影响。结果:ConA能剂量依赖性地升高CD4+CD25+调节性T细胞和CD4+CD25-效应性T细胞CD69的表达,对两群细胞CD69的升高表现出了相似的作用;另外,ConA在上述浓度能剂量依赖激活CD4+CD25+调节性T细胞的抑制功能。结论:ConA在体外对CD4+CD25+调节性T细胞活化和功能具有促进作用。ConA能一定程度模拟抗原,因而可用于评价药物对调节性T细胞的活化和功能影响。     

染料木黄酮对小鼠T细胞体外活化及增殖的影响

目的:研究染料木黄酮(Gen)对T细胞体外活化及增殖的影响,并探讨其机制。方法:利用荧光标记的单克隆抗体染色结合流式细胞术,检测多克隆刺激剂佛波醇酯(PDB)或刀豆蛋白(ConA)刺激下小鼠T细胞表达活化抗原CD69、CD25的百分率;以羧基荧光素乙酰乙酸(CFSE)标记技术结合流式细胞术,分析PDB＋Ion(Ionomycin)或ConA刺激下T细胞增殖相关指数。结果:Gen对ConA刺激组T细胞CD69、CD25表达有明显抑制作用(P＜0.05),且呈剂量依赖关系,而对PDB刺激组T细胞CD69及CD25表达的抑制需要较高浓度(＞50μmol/L);Gen无论对ConA或PDB＋Ion刺激组T细胞增殖均有显著抑制作用(P＜0.01),且均呈剂量依赖关系。结论:Gen可明显抑制多克隆刺激剂诱导的T细胞体外活化及增殖,其作用机制可能是抑制早期活化相关蛋白酪氨酸激酶活性。     

芹菜素对小鼠T淋巴细胞体外活化和增殖的抑制作用

研究芹菜素(apigenin,AP)对小鼠T细胞体外活化和增殖的影响,探讨其作用机制,以及将其开发为免疫抑制药物的可能。无菌分离小鼠淋巴结细胞,加入不同浓度(25μmol/L、50μmol/L、100μmol/L、150μmol/L和200μmol/L)的芹菜素预孵育4 h,用多克隆刺激剂刀豆蛋白A(concanavalin A,ConA)诱导T细胞活化和增殖,并用MTT法检测该药物浓度对T细胞的毒性作用。荧光标记抗体双染色结合流式细胞术,检测各浓度AP对ConA诱导的小鼠T细胞表达早期、中期和晚期活化抗原CD69、CD25和CD71的影响;以二乙酰羧基荧光素-琥珀酰亚胺酯(carboxyfluoresceindiacetate-succinim-idyl ester,CFDA-SE)染色结合流式细胞术,检测各浓度AP对ConA诱导的小鼠T细胞增殖的影响,并应用ModFit软件分析其增殖指数(proliferation index,PI)。结果显示,25~200μmol/L AP对ConA诱导的T细胞CD69、CD25的表达有显著抑制作用(P<0.01),且呈剂量依赖关系;25μmol/L和50μmol/L的AP抑制CD71的表达,但高浓度(大于100μmol/L)才有显著抑制作用(P<0.01)。各浓度AP对ConA诱导的T细胞增殖均有显著抑制作用(P<0.01),且呈剂量依赖关系。表明在一定浓度范围内,AP可显著抑制ConA诱导的小鼠T细胞体外活化及增殖,有望通过进一步研究将其开发成免疫抑制药物。     

耐受性CD8~+ NKT细胞体外增殖能力的鉴定

目的:利用CFSE标记细胞,流式细胞术(FCM)检测法,解析超抗原SEB活化的耐受性CD8+ NKT细胞在体外增殖的情况。方法:利用CFSE标记新鲜分离的C57BL/J鼠脾细胞,分别与ConA和LPS共同培养3d,收集细胞进行荧光染色并用FCM解析细胞表面CD69分子的表达率和增殖能力。CFSE标记的鼠脾细胞与SEB共培养5d和10d后,荧光染色并用FCM解析细胞表面CD69的百分数和增殖能力。SEB活化的第10天细胞经CFSE标记后在IL-2的协同作用下继续培养10d,荧光染色,FCM解析这群细胞的增殖能力、活性分子CD69的表达率和NKT细胞亚群的变化情况。结果:ConA、LPS和SEB三者均可以刺激小鼠脾细胞增殖。ConA和LPS在3d内可以使细胞增殖3代,且CD69的表达率为74.19%和41.56%;SEB在5d和10d内分别可以使细胞增殖5代和7代,细胞表面CD69的表达率为32.09%和48.66%。SEB活化的10d细胞可以在IL-2的协同下继续传代培养10d,可以增殖7代;这群细胞中CD8+ NKT细胞亚群,由原始的0.36%增加到38.58%;细胞表面CD69分子由正常值的0.11%提高到83.74%。结论:超抗原SEB活化的CD8+ NKT细胞可以在体外进行增殖培养,且这些细胞是活性化的细胞。利用CFSE标记细胞,FCM可以检测耐受性CD8+ NKT细胞在体外的增殖水平。     

淫羊藿甙对小鼠T淋巴细胞体外活化和增殖的影响

目的研究淫羊藿甙(ICA)对刀豆蛋白A(ConA)刺激的小鼠T淋巴细胞体外早期活化和增殖的影响。方法以MTT法检测T细胞药物毒性;利用流式细胞术(FCM)结合双色荧光抗体染色技术检测早期活化标志CD69分子的表达;运用流式细胞术结合活体染料羧基荧光素乙酰乙酸(CFDA-SE)染色技术和荧光抗体染色技术检测T细胞增殖。结果ICA在终浓度0.3、1.5、3.0μmol·L-1时对于CD69的表达以及淋巴细胞48和72h增殖,均有明显的抑制作用(P<0.01)。结论ICA能抑制ConA刺激的小鼠T淋巴细胞的早期活化和增殖,并呈剂量依赖性,即在最高浓度3.0μmol·L-1时抑制率最强。     

金银花提取物对小鼠淋巴细胞体外活化与增殖的影响

目的 研究金银花(Flos lonicerae,FL)提取物对小鼠淋巴细胞体外活化和增殖的影响,并初探其免疫抑制作用机制.方法 分离小鼠淋巴结细胞,以荧光标记的单克隆抗体染色结合流式细胞术,检测FL对刀豆蛋白A(Concanavalin A,ConA)刺激的小鼠淋巴细胞活化的影响;利用羧基荧光素乙酰乙酸琥珀酰亚胺酯(CFDA-SE)染色,分析FL对淋巴细胞增殖情况.结果 细胞活化分析表明,金银花提取物对ConA诱导的小鼠淋巴细胞CD69、CD25和CD71表达均有明显的抑制作用,且这种抑制程度与其药物浓度呈正相关(P＜0.05).CFDA-SE染色分析显示,不同浓度的金银花提取物均能明显抑制淋巴细胞的增殖(P＜0.05).结论 金银花提取物对ConA诱导下的小鼠淋巴细胞体外活化和增殖均有明显抑制作用,是一种有潜在能力的免疫抑制剂.     

TMB-8对小鼠T淋巴细胞体外活化、增殖和细胞周期的影响

目的: 研究胞内钙离子释放阻断剂8- (N,N-二乙胺) 辛基-3,4,5-三甲氧基苯甲酸酯（TMB-8）对刀豆蛋白A（Con A）介导的小鼠T淋巴细胞体外活化、增殖和细胞周期的影响。方法: 以Con A作为T细胞活化、增殖的刺激剂，以不同浓度的TMB-8及与环孢菌素A（CsA）联合作用于该系统，用流式细胞术检测T细胞早期活化标志CD69分子的表达；以活体染料羧基荧光素乙酰乙酸（CFDA-SE）染色流式细胞术，分析TMB-8在Con A刺激下小鼠淋巴细胞的增殖相关指数（PI）；以碘化丙啶染色分析细胞周期的分布情况。结果: Con A作用6 h后，CD69+ T细胞的比率为（74.88±1.88）%，TMB-8在终浓度10、20、40 μmol/L下均抑制Con A介导的T细胞CD69表达（P<0.01），其中，40 μmol/L的TMB-8为（52.55±1.54）%, 达到最高抑制率。培养48 h和72 h，Con A刺激下的PI值分别为1.24±0.01和2.05±0.07，TMB-8从5 μmol/L起均抑制Con A介导的淋巴细胞增殖（P<0.01），以40 μmol/L的效果最为显著，PI值分别为1.01±0.01和1.10±0.01；10 μmol/L的TMB-8与25 μg/L的环孢菌素A（CsA）具有明显的协同抑制作用（P<0.01）。细胞周期分析显示，培养48 h的TMB-8从10 μmol/L起即显著抑制S期（P<0.01）。结论: TMB-8可明显抑制Con A介导下的T细胞早期活化及增殖，并具T细胞周期的S期阻滞作用。     

喜树碱对小鼠T淋巴细胞活化、增殖以及细胞周期的影响

目的： 研究喜树碱（CPT）对刀豆蛋白A(ConA)介导的小鼠T淋巴细胞体外活化、增殖及细胞周期的影响。方法：以ConA刺激小鼠T淋巴细胞，建立小鼠T淋巴细胞活化、增殖的模型，以不同浓度的CPT作用于该模型，流式细胞术检测T细胞早期活化标志CD69分子的表达；以活体染料羧基荧光素乙酰乙酸（CFDA-SE）染色流式细胞术分析CPT 在Con A刺激下小鼠淋巴细胞的增殖相关指数（PI）；以碘化丙啶染色流式细胞术分析细胞周期的分布情况。 结果： ConA作用6 h后流式细胞术分析显示CD69的表达率为（58.88±0.55）%，不同浓度的CPT组（10 nmol/L、20 nmol/L、50 nmol/L、100 nmol/L）CD69的表达率分别为（55.48±0.98）%、（54.67±1.05）%、（50.40±0.82）%、（42.47±1.32）%，均可明显抑制CD69的表达(P<0.01)；ConA刺激48 h后流式细胞术分析显示，不同浓度的 CPT 组（10 nmol/L、20 nmol/L、50 nmol/L、100 nmol/L）的增殖指数（PI）明显低于对照组(P<0.05)；细胞周期分析显示刺激48 h后不同浓度的CPT组（10 nmol/L、20 nmol/L、50 nmol/L、100 nmol/L）均出现明显的凋亡峰（apoptosis peak，AP），sub-G1期、G₀/G₁期细胞的比率明显高于ConA刺激组(P<0.01)。结论：CPT可明显抑制ConA刺激的T淋巴细胞的活化、增殖，同时使淋巴细胞阻滞于G₀/G₁期。     

槲皮素对小鼠T细胞体外活化的抑制作用

目的:通过分析槲皮素对淋巴细胞早期活化标记物CD69表达的影响,探讨其对T淋巴细胞体外活化抑制作用的机制。方法:分离小鼠淋巴结细胞,加入多克隆刺激剂及槲皮素共同培养,分别于2、6、24h收获细胞,进行双色免疫荧光标记,以流式细胞仪对T细胞的CD69分子表达情况进行分析并计算抑制率。结果:槲皮素(终浓度10μmol/L)对未受刺激的T细胞CD69表达百分率无明显影响,而经佛波醇酯(PDB)及刀豆蛋白A(ConA)活化同时加入槲皮素的T细胞CD69表达百分率在2h、6h及24h均显著下降(P＜0.01)。槲皮素对PDB的抑制率随作用时间延长而明显下降,对ConA的抑制率平缓而持久。结论:槲皮素对PDB、ConA活化的T淋巴细胞均显示明显的抑制效应,表明该药可能作用于T细胞活化信号传递通路蛋白激酶Cθ或其下游部位,并且,这种抑制效应表现出一定的可逆性。     

Possible activation of murine T lymphocyte through CD98 is independent of interleukin 2/interleukin 2 receptor system

CD98 is a widely expressed cell surface heterodimeric protein of 125 kDa. Its expression is upregulated during lymphocyte activation induced by mitogen, superantigen, conventional antigen, and a combination of phorbol myristate acetate (PMA) and ionomycin. However, the role of CD98 in the immune system is not so well understood. The role of CD98 in murine T lymphocyte proliferation was investigated, especially in correlation with the interleukin 2 (IL-2)/interleukin 2 receptor (IL-2R) system. Monoclonal antibody (mAb) directed against murine CD98 heavy chain (mCD98HC) suppressed the proliferation of lymphocytes stimulated with concanavalin A (Con A). Anti-mCD98HC mAb did not suppress the expression of IL-2Ralpha. Anti-IL-2Ralpha mAb, which suppressed DNA synthesis, did not inhibit the expression of CD98HC. Murine IL-2 (recombinant), which induced considerable DNA synthesis by lymphocytes stimulated with a sub-optimal dose of Con A, did not induce CD98HC expression in lymphocytes. In addition, anti-mCD98HC mAb did not inhibit the production of IL-2 by lymphocyte stimulated with Con A. Taken together with these findings, it was speculated that the CD98 system is independent of the IL-2/IL-2R system in murine T lymphocyte activation.     

氧化苦参碱对淋巴细胞增殖和调节性T细胞（Tr）数量的影响

目的： 分析氧化苦参碱（OMT）对小鼠外周血调节性T细胞（Tr细胞）数量及其对刀豆蛋白A(Con A) 刺激的小鼠淋巴结T细胞增殖的影响, 探讨OMT治疗ACD的免疫学机制。方法： 建立DNFB诱发的小鼠ACD模型，腹腔注射（ip）不同剂量的OMT、PBS、氢化可的松(HCT)，在实验的第1 d、7 d、14 d、21 d、28 d小鼠尾静脉采血, 应用抗-CD3、抗-CD4、抗-CD25单抗进行免疫荧光标记, 流式细胞术检测各组CD4+CD25+T细胞数量。利用羧基荧光素乙酰乙酸(CFDA-SE)染色，流式细胞术检测OMT对小鼠淋巴结T细胞增殖的影响。结果： 500、125和31 mg/L OMT对小鼠淋巴结T细胞增殖呈剂量依赖性抑制，而16、8、4、2 mg/L OMT可促进小鼠淋巴结T细胞增殖，但剂量依赖关系不明显。腹腔注射OMT能明显提高小鼠外周血中CD4+CD25+T细胞数量, 与HCT组、PBS组比较（P<0.01）。结论: OMT对小鼠淋巴结T细胞增殖呈双向作用；腹腔注射OMT能明显提高小鼠外周血中CD4+CD25+T细胞数量；提示:OMT是一种双向免疫调节剂。     

Inhibitory effect of somatostatin on human T lymphocytes proliferation

Somatostatin (SOM) was originally described as a growth hormone release inhibiting factor, but SOM and its specific receptors (SOM-r) have been shown to be expressed on both normal and activated T and B lymphocytes and other immunocompetent cells. In the present study we have demonstrated that SOM strongly inhibits the proliferation of human T lymphocytes when stimulated by PHA, Con A or alloantigens. However, SOM was most effective when the T cells were stimulated by an alloantigen rather than a polyclonal activator such as PHA and ConA. Moreover, SOM strongly inhibited the expression of activation markers such as CD69 and CD25 that are expressed on T lymphocytes during alloantigen stimulation. SOM also inhibited both CD28 and CD2 mediated T cell proliferation. Whereas proliferation of T cells induced by the engagement of CD3 antigen using specific mAbs was only marginally affected. Our results would support the concept that in humans SOM plays a key role in the modulation of T cell activation by interfering with the antigen-independent pathways CD2 and CD28.     

Intra-epithelial lymphocytes: interferon-gamma production and suppressor/cytotoxic activities.

Human intraepithelial lymphocytes (IEL) proliferate minimally in response to phytohaemagglutinin (PHA), but produce as much interleukin-2 (IL-2) as do peripheral blood lymphocytes (PBL). The addition of sheep erythrocytes during activation of IEL with PHA markedly augments both T cell functions. This study evaluates the ability of IEL to produce interferon-gamma (IFN-gamma) and to develop suppressor and cytotoxic activities when stimulated with mitogens in the presence or absence of sheep erythrocytes. PHA-activated IEL produced as much IFN-gamma as did PHA-activated peripheral blood CD8+ T lymphocytes. IEL activated by concanavalin A (Con A) demonstrated less suppressor activity directed against T cell proliferation than did Con A-activated peripheral blood CD8+ T lymphocytes. IEL generated less mitogen-induced cellular cytotoxicity and lymphokine-activated killer cell activity than did peripheral blood CD8+ T lymphocytes. The addition of sheep erythrocyte lysates during mitogen stimulation of IEL markedly enhanced their proliferation and lymphokine production but did not affect their suppressor or cytotoxic activities.     

Human dendritic cells activate T lymphocytes via a CD40: CD40 ligand-dependent pathway

The CD40: CD40 ligand (CD40L) interaction provides T lymphocyte-mediated help for B lymphocyte and monocyte function but has also been shown to serve as a co-stimulus for T lymphocyte activation. In this report, we studied the regulation of CD40 expression and its functional relevance for the human dendritic cell (DC) stimulation of T lymphocytes. Only a small subpopulation of directly isolated blood DC expressed CD40. However, CD40 was rapidly up-regulated by culture, and its expression was further enhanced by interleukin (IL)-1α, IL-1β, IL-3, tumor necrosis factor-α and granulocyte/macrophage-colony-stimulating factor. Expression of CD40L on DC was not detected. The proliferation of T lymphocytes in an allogeneic mixed leukocyte reaction, stimulated by blood DC or epidermal Langerhans cells, was significantly reduced in the presence of the CD40 immunoglobulin (CD40Ig) fusion protein or CD40L monoclonal antibodies. Cross-linking of CD40 on directly isolated DC with mouse CD40L trimer (mCD40LT) markedly augmented CD80 and CD86 up-regulation. Nevertheless, the same cross-linking mCD40LT inhibited DC stimulated T lymphocyte proliferation. When CD40Ig was added simultaneously with CTLA-4Ig, only minimal and variable additional inhibition of DC-stimulated allogeneic T lymphocyte proliferation and IL-2 secretion was observed, compared to each fusion protein alone. These results suggest that both CD80/CD86-dependent and -independent components of DC-T lymphocyte CD40: CD40L co-stimulation exist and further emphasize that the majority of blood DC have to differentiate or be activated to express co-stimulatory molecules.     

Forskolin对佛波醇酯类刺激的小鼠体外T淋巴细胞行为的影响

目的 分析Forskolin对佛波醇酯多克隆刺激剂(phorbol 12,13-dibutyrate,PDB)联合离子霉素(ionomycin,Ion)刺激的小鼠CD3+T淋巴细胞体外增殖和周期的影响,在此基础上进一步研究Forskolin对单纯PDB刺激的小鼠CD3+T淋巴细胞早期活化标志CD69分子和中期活化标志CD25分子的影响,从而阐明其作用机制.方法 无菌分离小鼠淋巴结并制备单个淋巴细胞悬液,与不同浓度的Forskolin孵育48h后,运用羧基荧光素已酰已酸(CFDA-SE)染色技术和碘化丙锭(PI)染色技术结合流式细胞术、CRLLQuest 和ModFitLT软件,分别榆测Fomkolin对PDB+Ion刺激下小鼠CD3+T淋巴细胞增殖和周期的影响;与不同浓度的Forskolin孵育2 h、10 h,运用流式细胞术结合双色荧光抗体染色技术检测Fomkolin对PDB诱导下的小鼠CD3+T淋巴细胞CD69分子和CD25分子表达的影响.结果 Forskolin(10-7、10-6、10-5 mol·L-1)均能明显抑制PDB+Ion刺激的小鼠CD3+T淋巴细胞的增殖并将细胞阻滞在G0/G1期;同时也能明显抑制单纯PDB刺激下的CD3+T细胞早期和中期活化,且呈明显的量效关系.结论 提示Forskolin在CD3+T细胞活化过程中信号转导的某个环节上有抑制作用,从而通过抑制T淋巴细胞的活化,发挥免疫抑制作用,是一种潜在的免疫抑制剂.     

In vitro X-ray irradiation of human peripheral blood T lymphocytes enhances suppressor function

We studied the effect of in vitro X-ray irradiation on human peripheral blood T lymphocytes, with regard to their suppressor activity related to the concanavalin A (Con A)-induced suppressor system. To generate suppressor T lymphocytes, purified human T lymphocytes were incubated for 3 days in the first culture, with or without Con A. These lymphocytes were irradiated with various doses of X-ray before, mid or after the culture. After doing a second culture for 6 days, we measured the suppressive influence of these cells on T lymphocyte proliferation rates stimulated with allogeneic mononuclear cells, and B lymphocyte proliferation rates stimulated with pokeweed mitogen. Irradiation (1,000 rad) of cultures to which Con A had not been added induced much the same level of suppressor activity as seen in the cultures with Con A. The suppressor activity gradually increased with lapse of time from the irradiation to the suppressor cell assay. Suppressor T lymphocytes were resistant to X-ray irradiation and independent of DNA synthesis. On the other hand, irradiation-induced enhancement was minimal in cultures incubated with Con A, regardless of the irradiation time. As irradiation of human peripheral blood T lymphocytes was found to induce a suppressor function in vitro, clinical and experimental applications of irradiation in cases of a suppressed T lymphocyte function may be feasible.