肿瘤细胞组蛋白的免疫原性研究

为了寻找肿瘤患者血清中多种抗核抗体 (antinuclearantibodies,ANA )生成的新的可能免疫原 ;进一步论证细胞活化是核抗原性发生改变并诱导抗体产生的根本因素。提取SP2 / 0瘤细胞组蛋白免疫同系BALB/c小鼠 ,用ELISA方法检测IgG类抗组蛋白、抗dsDNA抗体 ,免疫荧光法检测ANA核型 ,免疫印迹法测定可溶性核抗原 (ENA )抗体。结果 :SP2 / 0瘤细胞组蛋白诱导同系BALB/c小鼠产生了IgG类抗组蛋白、抗dsDNA、抗Sm、抗SS A/SS B等多种自身ANA ,其核型有周边型、均质型、颗粒型等。推测肿瘤细胞组蛋白是诱导ANA生成的免疫原之一。     

空弯菌抗原诱导的自身抗体产生动力学

用CJ-S131菌苗经口免疫小鼠16周,观察免疫小鼠体内的自身抗体(抗ds-DNA,ss-DNA,组蛋白和ENA抗体)产生动力学。在CJ-S131菌苗连续免疫的16周内,免疫小鼠有两个自身抗体产生峰。免疫后第6周,出现第一峰,抗组蛋白和ENA抗体的阳性率高于抗ds-DNA和ss-DNA抗体;在第16周,抗ds-DNA和ss-DNA抗体的阳性率高于抗组蛋白和ENA抗体。在正常小鼠体内,存在“自然”抗核酸抗体(抗ds-DNA和ss-DNA抗体),随年龄而增长,但个体差异较大;而抗核蛋白抗体(抗组蛋白和ENA抗体)始终测不出。上述结果提示,抗组蛋白抗体和抗ENA抗体在自身免疫病的发病机理和早期诊断中,具有潜在意义,值得进一步研究。     

活性染色质诱导抗核抗体生成及肾损伤

系统性红斑狼疮 (SLE )的病因和诱导抗核抗体 (ANA )生成的激发原迄今不明。本实验试图用ConA活化淋巴细胞的染色质免疫同系BALB/c小鼠 ,寻找诱导ANA生成的真正免疫原 ,阐明SLE发生的激发原是自身活化细胞的核成分 ,而且证明它所诱导的ANA具有致病性。从ConA活化的脾细胞中提取染色质 ,然后免疫同系BALB/c小鼠 ,用ELISA方法测定IgG类抗双链DNA (dsDNA )、抗组蛋白抗体 ,用免疫荧光法检测抗核抗体核型和免疫复合物沉积 ,用免疫印迹法测定抗核抗体谱 ,在光镜下检测肾损伤及电镜下检测肾小球沉积物 ,用考马斯亮蓝法检测尿蛋白含量。结果显示 ,活性染色质能诱导IgG类抗dsDNA、抗组蛋白等多种抗核抗体生成 ,且肾小球有显著免疫复合物沉积和蛋白尿形成。该实验表明 ,活化淋巴细胞的染色质是诱导SLE发生的真正自身免疫原。     

组蛋白诱导抗核抗体产生及其对肾脏损害

目的 寻找系统性红斑狼疮中诱导抗核抗体（ANA）生成的真正的自身核成分免疫原。方法 从Con A活化的脾淋巴细胞中提取组蛋白免疫同系BALB／c小鼠,ELISA方法测定IgG类抗组蛋白、抗dsDNA抗体,免疫荧光法检测抗核抗体核型和免疫复合物在肾小球内的沉积,免疫印迹法测定抗可溶性核抗原抗体,考马斯亮蓝法检测尿蛋白含量,光镜下观察肾脏形态变化,电镜下观察肾小球电子致密物。结果 活性组蛋白诱导IgG类抗组蛋白、抗dsDNA等多种抗核抗体生成,且诱发同系小鼠产生SLE样肾脏病理变化。结论 活性组蛋白是诱发抗核抗体生成、造成肾损害的免疫原之一。     

磷酸化对组蛋白免疫原性的影响

为了研究细胞活化后组蛋白磷酸化程度的改变以及对其免疫原性的影响。将正常淋巴细胞组蛋白人为加磷酸、活性组蛋白人为去磷酸 ,用Westernblot法检测其磷酸化程度 ;然后用以上不同组蛋白同系免疫BALB/c小鼠 ,用ELISA法测定IgG类抗组蛋白抗体、抗dsDNA抗体 ,用免疫荧光法检测抗核抗体核型及肾脏病理 ,用免疫印迹法测定可溶性核抗原抗体。结果发现淋巴细胞活化后 ,其组蛋白H1成分发生明显的丝氨酸磷酸化 ,对正常组蛋白人为加磷酸仍无免疫原性 ,活性组蛋白人为去磷酸后仅影响抗体产生的滴度 ,仍具有免疫原性。所以丝氨酸磷酸化在组蛋白的免疫原性改变方面起一定的作用 ,但不是主要因素     

弓形虫排泄-分泌抗原鼻内免疫小鼠诱导体液免疫应答的动态观察

观察从Vero细胞与弓形虫速殖子共培养液分离的排泄-分泌抗原(Excreted-secreted antigens,ESA)鼻内免疫小鼠诱导的体液免疫应答及动态变化,为弓形虫复合黏膜疫苗候选抗原提供实验依据。BALB/c小鼠84只随机分为实验组和对照组,实验组以ESA为抗原(20μg/只),对照组用未接种弓形虫的细胞培养上清液20μL(μg/只),滴鼻免疫2次(间隔2周)。分别于2次免疫后第1、2、3、4、5、6、7周颈椎脱位处死小鼠。ELISA法测定血清IgG、IgA,粪便sIgA及肠液sIgA。结果表明,免疫组小鼠血清IgG、IgA和粪便sIgA及肠液sIgA均增高。血清IgG、IgA水平分别第5周、第4周达高峰,免疫后第1~7周(P<0.05)显著高于对照组。粪便sIgA第4周即达高峰,之后逐渐降低,至第7周仍(P<0.05)显著高于对照组。肠液sIgA第4周达高峰,第2、3、4周(P<0.05)高于对照组。可见,弓形虫ESA鼻内免疫BALB/c小鼠可有效诱导体液免疫应答,特异性抗体生成明显且可持续较长时间。     

活化淋巴细胞与慢性GVHR诱导的SLE样小鼠模型的比较

目的 :将本室建立的用活化淋巴细胞诱导的系统性红斑狼疮 (SLE)样小鼠模型与国际上公认的用慢性GVHR诱导的SLE样小鼠模型进行比较 ,进一步探索SLE的发病机理。方法 :分别将亲代Balb c小鼠淋巴细胞经静脉和用ConA活化的(Balb c×C5 7BL 6 )F1代小鼠淋巴细胞经皮下途径输入F1代小鼠 ,用ELISA测定IgG类抗dsDNA抗体和抗组蛋白抗体 ,用免疫荧光法检测抗核抗体 (ANA)荧光核型和肾小球内免疫复合物沉积 ,用免疫印迹法检测抗可溶性核抗原 (ENA)抗体。结果 :亲代淋巴细胞免疫F1代小鼠所致的慢性GVHR和活化F1代小鼠淋巴细胞均可诱导F1代小鼠产生高滴度的抗dsDNA抗体、抗组蛋白抗体等ANA ,并且肾脏都有明显的IgG类免疫复合物沉积。但亲代淋巴细胞免疫组ANA核型以颗粒型、核仁型为主 ,ENA多肽谱多在 32、47、6 7kD处显色 ;而活化淋巴细胞免疫组以胞浆型、周边型、均质型为主 ,ENA多肽谱在 2 8、47、6 7kD处显色。结论 :这 2种方法均可诱导出SLE样综合征 ,但其抗核抗体谱有所不同。     

NZB/W F1狼疮模型小鼠泪腺病变的特征

目的:观察狼疮易感NZB/W F1小鼠泪腺随周龄变化特点以及明确是否存在相应眼部体征改变。方法:应用BALB/c小鼠作对照,采用泪液分泌试验进行泪液分泌量测定,ELISA法行血清抗dsDNA抗体检测,采用H-E染色观察小鼠泪腺结构的病理改变及炎症程度并进行炎症评分。结果:NZB/W F1小鼠泪液分泌量低于BALB/c小鼠,29周龄开始其差值逐渐增大,到35周龄NZB/W F1小鼠泪液分泌量(4.6 mm±0.7 mm)显著低于同周龄BALB/c小鼠(8.7mm±0.7mm);NZB/WF1小鼠泪腺显著的灶性炎症细胞浸润出现在35周龄,密集成片浸润的炎症细胞甚至部分取代原有的腺泡结构,其炎症评分(3.3分±0.5分)明显高于同周龄BALB/c小鼠(1.1分±0.6分),小叶内及小叶间导管结构仍保存。结论:随周龄增加,NZB/W F1小鼠自发出现加重类似继发性干燥综合征的泪腺炎症变化,其眼部体征异常出现在35周龄。     

一株抗双链DNA单克隆抗体的制备及其特性研究

制备抗双链DNA(dsDNA)单克隆抗体并对其生物学特性进行初步研究。以活化淋巴细胞的DNA为免疫原,常规免疫BALB/c小鼠,采用B淋巴细胞杂交瘤技术制备单克隆抗体;用体内诱生法制备腹水,以间接酶链反应吸附试验(ELISA)法分析抗体的亚类、特异性和亲和力;用免疫荧光法检测抗体的荧光核型;用考马斯亮蓝法检测注入杂交瘤细胞的小鼠的尿蛋白含量。结果显示,成功获得了1株持续稳定分泌抗dsDNA单克隆抗体的杂交瘤细胞株,命名为6C2;该细胞株所分泌的抗体亚类为小鼠IgG2a,能特异性结合dsDNA,亲和力常数为2.67×10~8mol/L,免疫荧光核型为均质型;将6C2细胞注入正常BALB/c小鼠腹腔后,小鼠的尿蛋白含量较对照组明显增高。结果表明,抗dsDNA单克隆抗体6C2是致病性抗体,对于进一步研究抗dsDNA抗体的致病机制具有重要的价值。     

LAK细胞诱导抗双链DNA抗体生成条件的研究

本文以LAK细胞为免疫原,用不同的剂量、不同的途径免疫同系小鼠,对诱导抗dsDNA抗体生成条件进行比较研究.结果表明活化淋巴细胞诱导抗加dsDNA抗体生成具有明显的免疫剂量依赖性和免疫途径选择性.皮下免疫细胞≥10~6组易诱导抗dsDNA抗体产生;皮下和腹腔途径是有效的免疫途径,能明显诱导抗dsDNA抗体的生成,而静脉则不易诱导该抗体生成.本文确证了活化淋巴细胞达到一定的剂量,并经过适当的免疫途径就可以诱导抗dsDNA抗体的生成.此现象应引起临床上应用活化淋巴细胞治疗疾病时的注意.     

Specific suppression of the local GVH reaction by F1 spleen cells

The local graft-versus-host (GvH) reaction in (C57BL/6 X BALB/c) F1 hybrid mice, assayed by popliteal lymph node enlargement, was specifically depressed by an injection of parental lymphocytes mixed with spleen cells from F1 mice pretreated with the same parental lymphocytes. Suppressor activity of CBF1 spleen cells was obtained 7 days after inoculation of parental lymphocytes, and peaked on day 10. The suppressive activity was induced by only spleen cells from CBF1 which was inoculated Balb/c lymphocytes, but not C57BL/6 lymphocytes. The lymphocyte subpopulation responsible for the suppressive activity was noticed in T cell population.     

B cell apoptosis accelerates the onset of murine lupus

To investigate whether the increased rate of lymphocyte apoptosis in systemic lupus erythematosus is involved in the onset of the disease, apoptotic or necrotic T or B lymphocytes from various cell lines were injected intraperitoneally into pre-autoimmune (NZBxNZW)F1 mice (BW) and non-autoimmune BALB/c mice. The intraperitoneal production of cytokines and chemokines, the specific T cell response in the spleen, and the production of anti-histone and anti-dsDNA Ab were investigated. The onset of the disease was characterized by creatinine levels and evaluation of glomerular IgG deposits. In BW, but not in BALB/c mice, injection of apoptotic and not necrotic cells up-regulated IL-6 and IL-10 in resident macrophages. Administration of apoptotic cells augmented the number of Th2 and B lymphocytes recruited in the peritoneal cavity. Only the treatment with apoptotic B cells promoted a systemic Th2 autoimmune response to H2 histones, associated with earlier occurrence of high levels of anti-dsDNA autoantibodies, higher creatinine levels and more numerous glomerular IgG deposits than in BW controls not injected with apoptotic B cells. In genetically susceptible mice exposure to apoptotic of B, but not T, lymphocytes can elicit a Th2 response to H2 histones that helps B cell production of anti-dsDNA Ab and finally triggers the onset of lupus.     

Association between leukocyte infiltration and development of glomerulosclerosis in experimental lupus nephritis

Mice with chronic graft-versus-host disease (GvHD) induced by injection of DBA/2 lymphocytes into (DBA/2×C57BL/10) F1 hybrids (DBA/2 GvHD) develop a lupus-like glomerulonephritis with global glomerulosclerosis 12 weeks after induction of the disease. In two other strain combinations with similar H-2 incompatibilities [BALB/c into BALB/c×BL10 (BALB/c GvHD) and BALB.D2 into BALB.D2×BL10 (BALB.D2 GvHD)], GvHD induction leads to lupus nephritis without global glomerulosclerosis. This study investigated the identity of kidney-infiltrating leukocytes and their involvement in the development of glomerulosclerosis in these three strain combinations. In mice with DBA/2 GvHD, a significant increase in glomerular CD11a-positive cells was found 4 weeks after disease induction. Mice with BALB/c or BALB.D2 GvHD did not show an increase in glomerular CD11a-positive cells at any time point. In the interstitium, CD11a-positive cells were observed 4 weeks after disease induction only in mice with DBA/2 GvHD. In mice with BALB.D2 GvHD, no increase was found in interstitial CD11a-positive cells. In mice with BALB/c GvHD, interstitial CD11a-positive cells were found from week 4 onward. Further immunohistochemical analysis of the glomerular CD11a-positive cells in mice with DBA/2 GvHD showed that these cells were neither polymorphonuclear leukocytes (PMN), nor CD3-positive (T cells), B220-positive (B cells), or F4/80-positive (macrophages). They were all CD45-positive (leukocytes) and MHC class II-positive. In conclusion, we have shown in this model of chronic lupus nephritis that glomerular influx of as yet unidentified CD11a-positive leukocytes is associated with the development of glomerulosclerosis. © 1998 John Wiley & Sons, Ltd.     

A correlation between IgG class antibody production and glomerulonephritis in the murine chronic graft-versus-host reaction.

A graft-versus-host reaction (GVHR) was induced in (B10 x DBA/2)F1 (BDF1) and (BALB/c x A)F1 (CAF1) murine recipients by injection of their parental or B10.D2-derived spleen cells. The incidences of glomerulonephritis and autoantibody production were then correlated. All of the BDF1 mice that received DBA/2 spleen cells (termed DBA/2----BDF1) and 33% of the CAF1 mice that received BALB/c spleen cells (BALB/c----CAF1) developed glomerulonephritis. However, in other combinations (B10.D2----BDF1, A/J----CAF1) no significant glomerular lesions were observed. An analysis of antibodies by ELISA revealed that the groups with renal disease showed a significant polyclonal elevation of IgG class antibodies, including autoantibodies (anti-DNA, anti-MRBC, and NTA) and a conventional antibody (anti-TNP-KLH). No significant IgG class antibody production was observed in the groups that did not develop glomerulonephritis. Thus, it was suggested that an IgM to IgG class switch is important in the development of glomerulonephritis in GVHR. Other factors also appear to be involved. Only 33% of BALB/c----CAF1 developed glomerulonephritis, even though a level of IgG class antibody production was comparable to that observed in DBA/2----BDF1 in which 100% showed severe glomerulonephritis.     

Effects of CTLA4-Fc on glomerular injury in humorally-mediated glomerulonephritis in BALB/c mice

The effect of cytotoxic T-lymphocyte-associated molecule 4-immunoglobulin fusion protein (CTLA4-Fc) on humorally-mediated glomerulonephritis was studied in accelerated anti-glomerular basement membrane (anti-GBM) glomerulonephritis induced in BALB/c mice. This strain of mice develops antibody and complement dependent glomerulonephritis under this protocol. Sensitized BALB/c mice developed high levels of circulating autologous antibody titres, intense glomerular deposition of mouse immunoglobulin and complement, significant proteinuria, renal impairment, significant glomerular necrosis and a minor component of crescent formation 10 days after challenge with a nephritogenic antigen (sheep anti-GBM globulin). Early treatment during the primary immune response, or continuous treatment throughout the disease with CTLA4-Fc, significantly suppressed mouse anti-sheep globulin antibody titres in serum, and immunoglobulin and complement deposition in glomeruli. The degree of glomerular necrosis was improved and proteinuria was reduced, particularly in the earlier stages of disease. Late treatment by CTLA4-Fc starting one day after challenge with sheep anti-mouse GBM did not affect antibody production and did not attenuate glomerulonephritis. The low level of crescent formation found in BALB/c mice developing glomerulonephritis was not prevented by the administration of CTLA4-Fc. These results demonstrate that CTLA4-Fc is of benefit in this model of glomerulonephritis by its capacity to attenuate antibody production, without affecting the minor degree of cell-mediated glomerular injury.     

中国株HIV-1外膜蛋白基因疫苗诱导免疫小鼠免疫应答的实验研究

目的 :构建中国流行株HIV 1外膜蛋白 (gp12 0 )基因疫苗并接种小鼠 ,评价其诱导的体液和细胞免疫应答。方法 :将HIV 1gp12 0基因插入到真核表达载体pVAX1中 ,构建重组真核表达质粒pVAX1 GP12 0 ,并经EcoRI和PstI双酶切以及测序鉴定。同时以pVAX1 GP12 0和空载体pVAX1分别免疫BALB/c小鼠 ,采用ELISA检测免疫小鼠的特异性抗体和IFN γ水平 ,用MTT比色法检测免疫小鼠脾淋巴细胞的增殖 ,用乳酸脱氢酶 (LDH)试验检测小鼠特异性细胞毒性T淋巴细胞 (CTL)的应答。结果 :酶切及测序结果表明 ,成功地构建了HIV 1gp12 0基因疫苗。与空载体pVAX1组相比较 ,pVAX1 GP12 0免疫组小鼠血清抗HIV 1gp12 0抗体的滴度和IFN γ的水平均升高 ,两者差异显著 (P <0 .0 1)。pVAX1 GP12 0免疫组小鼠脾淋巴细胞增殖的刺激指数 (SI)及特异性CTL的杀伤活性 ,均高于空载体pVAX1组 (P <0 .0 1)。结论 :构建了针对我国HIV 1流行株的gp12 0基因疫苗。以其免疫BALB/c小鼠可诱导特异性体液和细胞免疫应答 ,为进一步将其用于我国的HIV的治疗奠定了基础。     

Tuberculosis DNA vaccine encoding Ag85A is immunogenic and protective when administered by intramuscular needle injection but not by epidermal gene gun bombardment

Immunogenicity and protective efficacy of a DNA vaccine encoding Ag85A from Mycobacterium tuberculosis were compared in BALB/c and C57BL (B6 and B10) mice immunized by intramuscular (i.m.) needle injection or epidermal gene gun (gg) bombardment. In BALB/c mice, gg immunization could induce elevated antibody and cytotoxic T lymphocyte responses with plasmid doses 50-fold lower than those required for i.m. immunization. Interleukin-2 (IL-2) and gamma interferon (IFN-gamma) secretion, however, was much lower in gg-immunized than in i.m.-immunized BALB/c mice. On the other hand, C57BL mice reacted only very weakly to gg immunization, whereas elevated Ag85A-specific antibody, IL-2, and IFN-gamma responses (significantly higher than in BALB/c mice) were detected following vaccination by the i.m. route. Antibody isotypes were indicative of Th2 activation following gg injection of BALB/c and of Th1 activation following i.m. injection of C57BL mice. Finally, C57BL but not BALB/c mice were protected by i.m. Ag85A DNA immunization against intravenous M. tuberculosis challenge, as measured by reduced numbers of CFU in spleen and lungs, compared to animals vaccinated with control DNA. Gene gun immunization was not effective in either BALB/c or C57BL mice. These results indicate that i.m. DNA vaccination is the method of choice for the induction of protective Th1 type immune responses with the Ag85A tuberculosis DNA vaccine.     

Completely allogeneic spleen cells induced cytolytic neonatal tolerance to alloantigens,but failed to establish allo-helper interactions with host T cells.

The injection of spleen cells from F1 mice into-newborns from a parental strain results in the establishment of cytolytic tolerance to donor alloantigens and the development of a lupus-like disease. This syndrome is the consequence of the recognition by alloreactive host CD4+ T cells of discordant major histocompatibility complex (MHC) class II antigens on semi-allogeneic donor B cells. We have analysed whether completely allogeneic spleen cells are as able as semi-allogeneic spleen cells to induce cytolytic tolerance to donor alloantigens and to co-operate with alloreactive T cells for autoantibody production. BALB/c mice were injected at birth with Thy-1-depleted spleen cells from (C57BL/6 x BALB/c)F1 or C57BL/6 mice, either alone or in combination. Cytolytic tolerance was always induced, as manifested by persistence of chimerism and acceptance of skin allografts. However, only F1 semi-allogeneic B cells were activated by alloreactive host T cells to produce anti-DNA IgG antibody. The deficient co-operation between BALB/c CD4+ T cells and completely allogeneic C57BL/6 B cells was confirmed after neonatal injection of (C57BL/ 6 x BALB/c)F1(Igha) spleen cells together with C57BL/6(Ighb) spleen cells. These mice developed anti-DNA antibodies bearing only the Igha allotype. Similar results were observed in experiments of allogeneic interaction in vitro, in which BALB/c CD4+ T cells were cocultured with either (C57BL/6 x BALB/c)F1 or C57BL/6 B cells. The present results demonstrate that completely allogeneic spleen cells efficiently induced cytolytic unresponsiveness to donor alloantigens, but B cells contained in this spleen cell population were unable to establish allo-helper interactions with alloreactive CD4+ T cells, suggesting that cytolytic and helper T-cell interactions involved in alloreactivity may be different.     

Inverse correlation between the utilization of an idiotype in specific immune responses and its representation in pre-immune "natural" antibodies

Previously we have characterized an idiotype (Id) that accounts for half of all specific anti-dextran B512 (Dex) antibodies in C57BL/6 mice. BALB/c mice produce the same Id in normal, pre-immune sera but fail to use it in antibody responses to Dex, although Id+ anti-Dex antibodies can be induced in this strain by anti-Id immunization. By limiting dilution analysis of B cell clonal precursors, we show here that the frequencies of Id+ B cells are comparable in both strains, but their state of activity is sharply distinct: while all Id+ B cells are small, resting lymphocytes in C57BL/6 mice, they are all large, naturally activated cells in BALB/c mice. The suggestion that naturally activated cells are poorly engaged in specific responses was supported by the delayed and lower Id+ responses obtained in BALB/c mice when they are immunized, in parallel with C57BL/6 animals, with a conjugate of anti-Id antibodies and lipopolysaccharide. Finally, C57BL/6 responder mice were found to closely reproduce the normal BALB/c situation, if analyzed 3 months after anti-Id priming: they produce low levels of serum Id and all Id+ B cells are in the large lymphocyte compartment. Upon immunization these animals develop serum Id+ responses that are undistinguishable from low-responder BALB/c mice. The relevance of these observations for the questions of physiologic self-reactivity is discussed.     

疟疾DNA疫苗免疫接种方法对小鼠 体液免疫应答的影响

目的 探讨DNA疫苗免疫接种方法对抗体水平及辅助性T细胞极化的影响。方法 利用DNA重组技术构建恶性疟原虫红内期多表位DNA疫苗,通过基因枪、肌肉注射、皮内注射等接种方法免疫小鼠,经ELISA测定该疫苗诱导产生特异性抗体的总量、亚型及表位特异性,比较不同免疫接种方法对DNA疫苗诱导产生抗体及辅助性T细胞极化的影响。结果 接种DNA疫苗的小鼠经3次免疫后都产生了较高滴度的抗重组蛋白抗体。基因枪组单位DNA诱导抗体滴度是肌注组的120倍。基因枪组小鼠血清抗体以IgG1升高为主,而肌注和皮内注射组小鼠血清抗体均以IgG2a升高为主。各免疫接种组诱导产生的抗表位多肽抗体特异性相同。结论 不同免疫接种方法不但会影响血清总免疫球蛋白水平,还能使辅助性T细胞向不同方向极化。肌注和皮内注射诱导产生以IgG2a为主的TH1型免疫应答,基因枪接种诱导产生以IgG1为主的TH2型免疫应答。DN疫苗的摄取方式可明显影响辅助性T细胞的极化。