异种移植物抗宿主病模型

目的 :①观察人→小鼠单向混合淋巴细胞反应 ;②建立人→小鼠异种移值物抗宿主病 (XGVHD)模型 ,探讨XGVHD的免疫发生机理。方法 :①无菌采集体小鼠脾淋巴细胞 ,经丝裂霉素处理 ,作刺激细胞 ;取健康成人外周血淋巴细胞 (hPBL) ,作反应细胞 ;异种单向混合淋巴细胞培养(one wayXMLC) 1周 ;②摧毁受者 (小鼠 )免疫系统 ;将hPBL经尾静脉注入小鼠体内 ,两周后检测脾、肾组织。结果 :①小鼠脾淋巴细胞明显刺激人外周血淋巴细胞 (hPBL)增殖 ,3 H TdR掺入值 (cpm)显著增高 (P <0 0 5 ) ;CD4 ,CD8,IgG ,IgM细胞含量明显升高 ,有显著差异 (P <0 0 5 )。②实验组 (注射hPBL)动物诱发XGVHD ,脾、肾组织中发现人中CD4、CD8、IgG、IgM细胞 ,有Fas蛋白表达和少量调亡细胞出现。结论 :①人→小鼠单向混合淋巴细胞培养 (one wayXMLC) ,具有明显细胞增殖反应 ;②本实验方法成功诱发XGVHD ,建立人→小鼠异种移殖物抗宿主 (XGVHD)模型     

持久稳定的大鼠→小鼠造血嵌合体模型的建立

目的：建立持久稳定的造血嵌合体模型．方法：将预处理后的SD大鼠经尾静脉注射BALB／c小鼠骨髓细胞,诱导形成特异性耐受的嵌合体SD大鼠．30d岳,再将此嵌合体大鼠的骨髓反向移植给致死性照射后的BALB／c小鼠,监测小鼠的存活率,移植后30d做皮片移植和混合淋巴细胞培养,观察小鼠嵌合率的变化．结果：嵌合体模型小鼠仅有轻度移植物抗宿主病的表现,生存期明显延长,移植后嵌合率较稳定,移植皮片存活期延长,与对照组相比有显著性差异．结论：通过输入嵌合体骨髓的方法可建立稳定持久的大鼠→小鼠嵌合体模型．     

Establishment of a sensitized canine model for kidney transplantation

Objective:To establish a sensitized canine model for kidney transplantation. Methods: 12 male dogs were averagely grouped as donors and recipients. A small number of donor canine lymphocytes was infused into different anatomic locations of a paired canine recipient for each time and which was repeated weekly. Specific immune sensitization was monitored by means of Complement Dependent Cytotoxicity (CDC) and Mixed Lymphocyte Culture (MLC) test. When CDC test conversed to be positive and MLC test showed a significant proliferation of reactive lymphocytes of canine recipients, the right kidneys of the paired dogs were excised and transplanted to each other concurrently. Injury of renal allograft function was scheduled determined by ECT dynamic kidney photography and pathologic investigation. Results:CDC test usually conversed to be positive and reactive lymphocytes of canine recipients were also observed to be proliferated significantly in MLC test after 3 to 4 times of canine donor lymphocyte infusions. Renal allograft function deterioration occurred 4 d post-operatively in 4 of 6 canine recipients, in contrast to none in control dogs. Pathologic changes suggested antibody-mediated rejection (delayed) or acute rejection in 3 excised renal allograft of sensitized dogs. Seven days after operation, all sensitized dogs had lost graft function, pathologic changes of which showed that the renal allografts were seriously rejected. 2 of 3 dogs in control group were also acutely rejected. Conclusion：A convenient method by means of repeated stimulation of canine lymphocyte may induce specific immune sensitization in canine recipients. Renal allografts in sensitized dogs will be earlier rejected and result in a more deteriorated graft function.     

雷帕霉素对异种单向混合淋巴细胞培养的免疫抑制作用

目的 :观察新型免疫抑制剂雷帕霉素 (Rapa mycin ,RPM)对异种单向混合淋巴细胞培养 (one wayXMLC)的免疫抑制作用。方法 :①无菌采集小鼠脾淋巴细胞 ,经丝裂毒素处理 ,作刺激细胞 ;②取健康成人外周血淋巴细胞(hPBL) ,作反应细胞 ;③异种单向混合淋巴细胞培养 ;④实验分对照组 (不用药 )、RPM组 ,实验组 (用药组 )又分不同药物浓度组。结果 :①小鼠脾淋巴细胞明显刺激人外周血淋巴细胞 (hPBL)增殖 ,3H TdR掺入值 (cpm)显著增高 (P <0 .0 5 ) ;CD4 、CD8、IgG、IgM细胞含量明显升高 ,有显著差异 (P <0 .0 5 )。②各实验组的cpm值下降 ,RPM的IC50 (5 0 %有效抑制浓度 )≈ 1.5nmol L。测定各实验组的CD4 ,CD8,IgG ,IgM细胞含量下降 ,药物的IC50 与上相似。结论 :①人→小鼠单向混合淋巴细胞培养 ,具有明显细胞增殖反应。②RPM对异种单向混合淋巴细胞培养具有明显的免疫抑制效果 ,其作用呈剂量依赖性。     

犬肾移植致敏模型的建立

目的建立犬致敏后的肾移植动物模型。方法雄性家犬各6条配对作为淋巴细胞供受体,采用小剂量（0.4×10^7-1.2×10^7个/kg）淋巴细胞多部位多次输注的方法诱导致敏。用补体依赖的淋巴细胞毒（complement deendent cytotoxicity,CDC）和混合淋巴细胞培养（mixed lymphocyte culture,MLC）试验进行检测。当CDC转为阳性和MLC显示反应淋巴细胞增殖明显活跃后,淋巴细胞供受体犬间进行交叉肾移植,术后定期ECT动态显像观察移植肾功能变化;分批摘取移植肾行病理检查,观察排斥反应发生情况。结果实验犬均在输注淋巴细胞3-4次后CDC转为阳性,MLC显示反应淋巴细胞增殖明显活跃。肾移植术后4天ECT检查有4条致敏犬移植肾血流灌注下降,肾功能出现损害,摘取的3只移植肾病理检查表现为抗体介导的排斥（延缓）或急性排斥反应;对照组未见异常。术后7天,致敏犬移植肾均因急性排斥失功;对照组3条犬有2条出现肾功能损害,病理检查示急性排斥反应。结论小剂量淋巴细胞多部位多次输注可以诱导出家犬的免疫致敏状态。致敏犬肾移植术后移植肾排斥反应出现较早,肾功能损害更严重。     

茯苓酸，一种新型的抗鼠心脏移植后急性期排斥反应的化合物

Background Pachymic acid （PA）, a natural triterpenoid, is known to significantly reduce cell proliferation and induce apoptosis in vitro through initiation of mitochondria dysfunction. However, its effect on immune cells and anti-rejection following organ transplantation remains unknown. Methods In this study, we investigated PA as a treatment to control acute rejection occurred in rats which had accepted cardiac transplantation. We measured apoptosis of peripheral blood lymphocyte （PBLs）, and CD4^＋ lymphocyte, as well as the number of CD4^＋ and CD8^＋ lymphocytes and the effect of PA on acute rejection in rats 7 days after cardiac transplantation. Results PA treatment might decrease allograft rejection, protect PBLs from apoptosis, and reduce the percentage of CD8^＋ lymphocyte. PA neither regulated the number nor the apoptosis rate of CD4^＋ lymphocyte. Conclusions Our findings indicated that PA has an anti-apoptotic effect acting on PBLs through a novel mechanism involving stabilization of the PBLs mitochondrial transmembrane potential, an anti-rejection effect in rats after cardiac transplantation and an inhibiting effect to CD8^＋ lymphocyte.     

Effects of cryptotanshinone on immune functions in rats with adjuvant arthritis

Background Cryptotanshinone （CT） was originally isolated from the dried roots of Salvia militorrhiza, an herb that is used extensively in Asian medicine and the extracts of this herb have been used in the treatment of several pathologies, including cardiovascular diseases, hematological abnormalities, hepatitis, and hyperlipidemia, but no studies had been carried on the treatment for rheumatic diseases with it. This study aimed to investigate the effects of cryptotanshinone on immune functions in rats with adjuvant arthritis （AA）. Methods Complete Freund＇s adjuvant was used to induce AA in rats. Thymus and spleen was aseptically taken from normal rats and the AA rats. Then a thymus lymphoid cell suspension, splenic lymphoid cell suspension and peritoneal macrophage cell suspension were prepared. After adding CT （0.1 ug/ml, 1.0 ug/ml, 10 ug/ml, 100 ug/ml, 1000 ug/ml） into the suspension, T and B lymphocytes proliferation was determined by 3-（4,5-2 dimethylthiazal-2yl）2,5- diphenyltetrazoliumbromide （MTT） assay. And the activities of interleukin-1 （IL-1） and IL-2 were measured by the mouse lymphocytes proliferation assay. Results Thymic T and splenic B lymphocyte proliferation of the AA rat was significantly lower, and could be stored through using CT in vitro. CT （100ug/ml and 1000ug/ml） increased T or B lymphocytes proliferation in vitro （P 〈0.01）. In AA rats, the levels of IL-1 released by abdominal PMφ significantly increased whereas the level of IL-2 released by T cells decreased in vitro. CT （1000 pg/ml） decreased the production of IL-1 and promoted production of IL-2 in vitro （P 〈0.05）. Conclusions CT can ameliorate the abnormal immunological functions in AA rats.     

PHA、ConA、PWM对血内淋巴细胞的激活效应研究

实验用不同浓度的PHA、ConA、PWM研究了对正常人血内淋巴细胞的激活效应,观察了PHA、ConA及PWM激活后的增殖特性。其增殖高峰分别出现在第5、4、6天。可见不同丝裂原激活的淋巴细胞各具不同的代谢活力及增殖状态。分别反映着血中不同淋巴细胞群的特性。     

大鼠骨髓间充质干细胞对同种异体T淋巴细胞的作用及其机制

目的:探讨骨髓间充质干细胞(MSCs)在混合淋巴细胞反应(MLR)中对同种异体T淋巴细胞免疫应答反应的影响,并探讨其作用机制。方法:建立MSCs和同种异体T淋巴细胞共培养体系,反应体系总量250μl。以SD大鼠的脾T淋巴细胞为刺激细胞,以W istar大鼠的脾T淋巴细胞为反应细胞,分为6组。组Ⅰ:对照组,1×105刺激细胞和1×105反应细胞共同培养;组Ⅱ:1×105反应细胞与1×104SD大鼠的MSCs共同培养;组Ⅲ:1×105刺激细胞和1×105反应细胞并加入1×104SD大鼠的MSCs共同培养;组Ⅳ:细胞种类及数量同组Ⅲ,另加1-甲基色氨酸(1-MT)(终浓度1 mol/L);组Ⅴ:细胞种类及数量同组Ⅲ,另加植物刺激素(终浓度2μg/m l);组Ⅵ:每孔加入反应细胞和刺激细胞各1×105及MSC 1×103。混合培养120 h,结束培养前13 h,每孔加入3H-TdR 20μl,以液闪测定仪测定各组的每分钟脉冲数。反相高效液相色谱法检测MSCs和MLR共培养体系中色氨酸含量。结果:MSCs可以抑制混合淋巴细胞培养体系中T淋巴细胞增殖,并呈现出剂量依赖关系;同时MSCs和MLR共培养体系中色氨酸含量明显降低。1-MT可以阻断这一作用。结论:MSCs在体外可抑制同种异体T淋巴细胞的免疫应答,吲哚胺2,3双加氧酶参与了这种免疫抑制作用。     

曲古抑菌素A对小鼠混合淋巴细胞培养中淋巴细胞增殖和IL-2表达的影响

目的 研究曲古抑菌素A(TSA)对小鼠体外混合淋巴细胞培养中淋巴细胞增殖及IL-2表达的影响,探讨TSA对T细胞免疫功能的影响.方法 采用0.16、0.8、4、20、100、500 nmol/L倍比浓度TSA作用于BALB/c及C57BL小鼠混合淋巴细胞培养体系.根据不同的OD值测定12、24、48 h各浓度TSA对T淋巴细胞增殖的抑制率;相同浓度梯度TSA再作用于经丝裂霉素处理过的BALB/c淋巴细胞与C57BL淋巴细胞单向混合淋巴细胞培养体系,以环磷酰胺作对照,应用流式细胞技术观察其对IL-2表达的影响.结果 TSA可以抑制小鼠混合淋巴细胞培养中T淋巴细胞的增殖,这种抑制能力表现出明显的量效及时效依赖性;TSA也显著抑制经刺激激活的小鼠T淋巴细胞的IL-2的表达,并且随着TSA浓度的升高,IL-2表达逐步下降.但与CTX比较有显著性差异(P<0.01).结论 TSA能抑制混合淋巴细胞培养中淋巴细胞的增殖.减少激活T淋巴细胞IL-2的表达,降低T细胞的免疫活性,能够减弱对外来抗原刺激的免疫应答.     

EXPERIENCE ON HLA TYPING FOR ALLOGENEIC MARROW TRANSPLANTATION IN 217 MEMBERS OF 30 FAMILIES

From April 1978 to Oct 1990, 217 members of 30 families who requiredallogeneic marrow transplantation were examined for HLA typing, with HLA standardantiserum and mixed lymphocyte culture (MLC). The following conclusions could bedrawn: (1) when the HLA-A, B, C loci between donor and recipient were identical, theD locus also was generally identical too, but, in some rare cases the HLA-A, B, C wereidentical while the D locus remained different detected by MLC SI which wassignificantly increased; (2) in addition to twin, the sib were the main candidates of donorsin allogeneic marrow transplantation, however, if the phenotype of children was compati-ble to that of their parents with no significant stimulation in MLC, the parents could alsobe considered as a donor; (3) if the HLA-A, B, C typing was identical between fatherand motaher, the parents can also be considered as an eligible donor. Using HLA-A, B,C, DR and D loci identical sibs as donor, 9 of 11 cases (aplastic anemia 9 cases andANLL-M2 2 cases who received allogeneic marrow transplantation) had the evidence ofengraftment. Much attention should be paid to the difference of the minorhistocompatibility antigens, such as sex associated antigen between donor and recipient, be-cause even in 11 cases with HLA-A, B, C, DR and D loci identical sibs as donors formarrow transplantation, 5 cases still had the manifestation of GVHD in various degree,4/5 died of severe GVHD.     

通痹灵总碱对大鼠机体细胞免疫的调节作用

目的 研究通痹灵（TBL）的有效部位总生物碱对生物增殖及T淋巴细胞转铁蛋白受体（CD71）的影响,探讨通痹灵调节细胞免疫的作用机理。方法 培养大鼠淋巴细胞，刀豆蛋白（ConA)刺激72h，四甲基偶氮唑盐（MTT）法检测通痹灵总碱对淋巴细胞增殖的影响；佛波醇酯（PDB）或ConA刺激48h ,流式细胞术检测T淋巴细胞CD71的表达率。结果 不同浓度的TBL总碱可明显抑制ConA刺激下的淋巴细胞增殖；不同浓度的TBL总碱对PDB和ConA激活的T淋巴细胞CD71表达均有明显的下调作用，而且呈明显的量效关系，对ConA刺激下的CD71表达抑制要强于PDB。结论 TBL总碱可抑制异常增殖的T淋巴细胞，其作用机制可能是通过抑制转铁蛋白受体来实现的。     

人羊膜间充质干细胞与骨髓间充质干细胞对外周血淋巴细胞的免疫调节作用比较

目的 比较人羊膜间充质干细胞(hAMSC)与骨髓间充质干细胞(hBMSC)对异体外周血淋巴细胞的免疫调节功能,为临床应用hAMSC治疗移植物抗宿主病提供实验依据.方法 通过酶消化法和Ficoll-Hypaque密度梯度离心法分别分离出人羊膜间充质干细胞和骨髓间充质干细胞,体外扩增培养间充质干细胞(MSC),获取第4代细胞,建立MSC与经植物血凝素(PHA)刺激的异体人外周血单个核细胞(PBMC)共培养体系,采用流式细胞术分析比较两种不同共培养体系中T淋巴细胞亚群的变化情况,采用ELISA法比较两种MSC共培养体系中细胞因子白介素2(IL-2)及白介素10(IL-10)的分泌水平.结果 (1)hAMSC+PBMC+PHA、hBMSC+PBMC+PHA共培养组Treg、Th2、Tc2细胞亚群的比例均较PBMC+PHA组明显上升(P<0.05),Th1、Tc1细胞亚群的比例均较PBMC+PHA组明显下降(P<0.05),且hAMSC+PBMC+PHA、hBMSC+PBMC+PHA共培养组T细胞亚群的变化差异无统计学意义(P>0.05);(2)ELISA结果提示,与PBMC+PHA组相比,hAMSC+PBMC+PHA、hBMSC+PHA+PBMC共培养组上清液中IL-2的水平均明显下降(P<0.05),hAMSC+PBMC+PHA、hBMSC+PHA+PBMC共培养组上清液中IL-10水平均明显上升(P<0.05),hAMSC+PBMC+PHA、hBMSC+PBMC+PHA共培养组上清液中IL-2、IL-10含量的变化无统计学差异(P>0.05).结论 hAMSC、hBMSC对外周血淋巴细胞具有相似的免疫调节功能,提示hAMSC可能为移植物抗宿主病的预防和治疗提供一种新的选择.     

丹参和天麻素在大鼠脑出血后的治疗作用

目的:探讨脑出血血肿周围细胞免疫机制及丹参、天麻素的治疗作用.方法:用免疫组织化学及组织HE方法,观察40只大鼠尾壳核脑出血后3、7d及药物治疗组的血肿周围区域CD3 、CD8 淋巴细胞的表达和微血管增生情况.结果:脑出血后血肿周围存在CD3 、CD8 淋巴细胞表达.在脑出血3d时丹参和天麻治疗组血肿周围CD3 淋巴细胞数明显高于对照组,CD8 淋巴细胞数低于对照组.丹参组在此期间血管增生明显.出血7 d后丹参治疗组血肿周围CD3 淋巴细胞数明显高于对照组,CD8 淋巴细胞数低于对照组;而天麻组CD3 淋巴细胞数下降,但血管增生显著.结论:丹参和天麻素在脑出血治疗过程中均表现出免疫调节和血管增生作用.     

新生大鼠同种心脏移植免疫耐受的实验研究

目的探讨诱导新生大鼠免疫耐受性。方法实验组新生SD大鼠胸腺内接种成年wistar大鼠2.5×10     

TJU103对小鼠同种异基因造血干细胞移植模型GVHD的预防作用

目的探讨TJU103对小鼠同种异基因造血干细胞移植模型移植物抗宿主病(GVHD)是否起预防作用。方法(1)用单向混合淋巴细胞培养方法检测TJU103对T淋巴细胞增殖的影响;(2)以BALB/c(H-2d)、CB6F1(H-2d/b)分别作为完全异基因移植和半相合基因移植的受鼠,给予9.0Gy全身照射后4h,单纯照射组经尾静脉注射0.3mlD-Hank's液,不进行细胞移植;对照组经尾静脉注射C57BL/6小鼠混合细胞悬液(4.5×106骨髓细胞 3.0×107脾细胞),但不进行其他治疗处理;实验组经尾静脉注射C57BL/6小鼠混合细胞悬液(4.5×106骨髓细胞 3.0×107脾细胞) TJU103(终浓度25μg/ml),此后腹腔注射TJU10350μg/d,共7d,然后观察其造血恢复、植入及GVHD的情况。结果(1)TJU103可以显著抑制T细胞活化增殖,其抑制作用呈剂量依赖性,在25μg/ml浓度时,可以抑制83%细胞增殖。(2)由于没有给予GVHD防治措施,对照组受鼠GVHD的发生率和死亡率分别为10/10和10/10;而完全异基因移植实验组小鼠GVHD发生率仅为2/10,30d生存率增加至8/10(P<0.01),中位生存期延长至30d以上(P<0.01);半相合基因移植实验组小鼠GVHD发生率为1/10,30d生存率增加至9/10(P<0.01),中位生存期延长至30d以上(P<0.01)。结论TJU103不仅可以显著抑制体外T淋巴细胞增殖效应,而且可显著降低小鼠同种异基因造血干细胞移植模型GVHD的发生率。     

动粒蛋白与人外周血淋巴细胞增殖关系的研究

笔者以正常人外周血淋巴细胞为实验材料,加入２ μｇ／ｍｌ 的ＰＨＡ刺激,用３Ｈ—ＴｄＲ标记,通过放射自显影,测定培养不同时间后进入细胞周期的淋巴细胞数量及Ｍ 期的细胞数量,探讨细胞内动粒蛋白含量变化与淋巴细胞增殖的关系。ＡＣＡ间接免疫荧光染色显示,正常未经转化的淋巴细胞和加ＰＨＡ刺激培养至４８ ｈ 的淋巴细胞内动粒荧光斑点小而微弱,加ＰＨＡ刺激培养５４～７２ ｈ 的淋巴细胞内动粒荧光斑点亮度逐渐增强,体积逐渐增大。Ｗｅｓｔｅｒｎ ｂｌｏｔ 表明,１７ＫＤ和５２ＫＤ两种动粒蛋白在对照组和培养不同时间的各组淋巴细胞内均存在,且含量保持相对稳定,８０ＫＤ和５６ＫＤ两种动粒蛋白在未经培养和培养至４８ ｈ 的淋巴细胞内不出现,８０ＫＤ蛋白在培养５４ ｈ 的细胞内可见。培养６０～７２ ｈ,淋巴细胞内可被ＡＣＡ 特异识别的动粒蛋白共四种：８０ＫＤ、５６ＫＤ、５２ＫＤ和１７ＫＤ。     

ICOS-Ig combined with CsA induces long term survival of cardiac allografts in mouse

Objective： To study the synergistic effect of ICOS-Ig combined with cyclosporine （CsA） on mouse heart transplantation and explore its therapeutic potential. Methods： ICOS-Ig fusion protein was generated by fusing the extraeellular portion of human ICOS and Fc portion of human IgG. To investigate the effect of ICOS-Ig on T-cell proliferation in vitro, ICOS-Ig or IgG was added to the primary MLR cultures （BALB/c spleen T cells as responder cells and irradiated C57BL/6 spleen cells as stimulator cells）. The cells responsiveness rates were detected by 3H-TdR methods. Then the T cells of each group in primary MLR were cultured as responder cells for secondary MLR, and irradiated C57BL/6 （donor） or C3H （third party） spleen cells as stimulator cells. To study the effect of ICOS-Ig on T-cell proliferation in vivo, CFSE-labeled C57BL/6 spleen cells were transferred to irradiated BALB/c mice. Mice were then treated with IgG, ICOS-Ig or CsA. Seventy two hours after transfer, the spleen cells of the mice were harvested for the detection of CD4^＋CFSE^＋ and CD8^＋CFSE^＋ by FACS. C57BL/6 mouse underwent transplantation of the hearts of BALB/c mouse and were then randomly divided into five equal groups： no treatment group, control lgG treated group （250 gg i.p. d2, 4, 6）, ICOS-Ig treated group （250 μg i.p. d2, 4, 6）, CsA treated group （10 mg/kg i.p. d0-6）, ICOS-Ig combined with CsA group. The cardiac allograft survival was monitored by daily palpation. Results： In primary MLR, ICOS-Ig inhibited T-cell proliferation, （inhibition ratio 58i8.2% in 50 μg/ml）. In secondary MLR, ICOS-Ig specifically inhibited donor spleen cells, which suggested ICOS-Ig could induce donor-specific hyporesponsiveness. In the CFSE dye assay, CD4^＋CFSE^＋ and CD8^＋CFSE^＋ in ICOS-Ig and CsA group was stronger than those in control group, which showed ICOS-Ig and CsA could inhibit the proliferation of allo-reactive T cells in vivo. In mouse heart transplantation model, survival was significantly prolonged in animals treated with ICOS-Ig or CsA as compared with controls. Moreover, ICOS-Ig combined with CsA group had even longer engraftment （〉100 d） than ICOS-Ig or CsA used alone. In histological examination, it was found that there were congestions and edemas in no treatment and IgG treated recipients, together with a lot of inflammatory cells infiltrated. Allogeneic hearts from ICOS-Ig and/or CsA immunized recipients revealed milder histological changes. It was revealed in mechanical analysis that splenic T cells from recipients also exhibited depressed mixed leukocyte reactions （MLR） and cytotoxic lymphocyte reactions （CTL）. Conclusion： These data suggest that ICOS-Ig combined with CsA induces a long-term survival of mouse cardiac allografts, whereas monotherapy is less effective in this regard. Thus, ICOS-Ig combined with CsA treatment may be a novel regimen to combat allograft rejection.     

大鼠骨髓间充质干细胞在淋巴细胞增殖中的免疫调节作用

目的:探讨大鼠骨髓间充质干细胞(BM MSCs)在体外对淋巴细胞增殖的影响及其作用机制。方法:分离和鉴定大鼠MSCs,与淋巴细胞、BRL、刀豆蛋白(ConA)建立共培养体系,混合培养0h、24h和48h后,用ELISA方法检测上清中TNF-α、TGF-β和IL-10的分泌量,MTT方法检测淋巴细胞数目变化,流式细胞仪检测调节T细胞(Treg)的含量变化。结果:加入MSCs后TNF-α分泌量降低,TGF-β和IL-10分泌量升高,OD值明显低于未加MSCs组的对照组(P<0.05),Treg含量升高。结论:骨髓MSCs在单独存在以及与BRL同时存在时均对淋巴细胞的增殖具有抑制作用,并且作用程度随时间变化不明显,其中IL-10、TGF-β以及Treg参与了这种免疫抑制过程。     

树突状细胞单克隆抗体对大鼠心脏移植排斥反应的免疫抑制作用

探讨树突状细胞单克隆抗体（DC McAb）对大鼠心脏移植排斥反应的免疫抑制效果及其对细胞免疫和体液免疫的影响。方法：以大鼠同种异体腹腔心脏移植为模型（Wistar→SD），应用含DC McAb的WZD腹水按1∶25（McAb 25组）和1∶50（McAb 50组）稀释，心脏移植后受体腹腔注射给药7?d，1?ml/d，观察移植心脏存活时间。另设非移植组，相同方法给药4～5?d后处死大鼠，取脾观察DC McAb对大鼠脾淋巴细胞增殖、白细胞介素 2（IL 2）生成活性及绵羊红细胞（SRBC）免疫后抗体形成细胞功能的影响。结果：受体体内短期应用DC McAb，McAb 25组大鼠移植心脏存活时间为（19.37±2.93）d，McAb 50组为（19.13±2.25）d，而生理盐水对照组（NS组）为（8.75±1.28）d(P均＜0.01)；两McAb组脾淋巴细胞增殖、IL 2生成活性及抗SRBC抗体形成能力均明显低于对照组（P均＜0.01）。结论：DC McAb能够明显延长大鼠移植心脏存活时间，对大鼠脾淋巴细胞增殖、IL 2生成活性及抗体形成细胞功能均有明显抑制作用。