重症肌无力抗乙酰胆碱受体抗分泌的调控

AchR—特异性CD4~+T细胞通过对AchR特异性位点的识别,将AchR—MIR的主要免疫功能区提供给B细胞,有效地帮助B细胞分泌高致病性的抗体;T_h细胞通过分泌淋巴因子来实现对AchR—Ab的分泌的调控,根据条件的不同,可产生辅助或抑制作用。近来有人发现B细胞亦产生对T细胞的正向调节作用。此外,IL—1、IL—2、IL—4、IL—6等也与AchR—Ab产生有关。     

淋巴因子的测定在急性排斥反应诊断中的临床意义

随着免疫抑制剂的发展，临床上急性排斥反应也变的更加隐匿，单纯根据血肌酐的变化及试验性的冲击治疗，已不能满足临床的需要；对患者行移植物活检穿刺又受到患者观念的束缚。临床上需要方便快捷的诊断方法，急性排斥反应时淋巴因子的活跃表达可以满足这一需要。     

NK／LAK细胞对人口腔癌耐细胞药株杀伤活性的观察

OBJECTIVE: To understand the relation between cytotoxic activity of immunologic effector cells and multidrug resistance of the tumor cells. METHODS: Continuous observation of the morphological changes and MTT colorimetry were employed to evaluate the cytotoxic activity of lymphokine-activated killer (LAK) cells and natural killer (NK) cells against multidrug-resistant (MDR) human oral carcinoma cell line-KBV200 (before and after reversal of MDR) and parental drug-sensitive cell line KB. The morphologic changes of LAK cells and the 3 target cell lines were observed continuously under inverted microscope 3 h after co-culture of LAK cells with one of three target cell lines respectively. The lysis rates of three tumor cell lines in response to co-culture with LAK or NK cells were determined using MTT colorimetry. RESULTS: In comparison with the parental drug-sensitive cell line KB, both KBV200 and its reserved cell line by verapamil (KBVV) showed earlier adherence and greater number of cells lysed by LAK. In MTT colorimetry assay, the cytotoxicity of both LAK and NK cells against the 3 cell lines was associated with the effector-to-target (E/T) cell ratio; the lysis rates of KBV200 and reversed KBV200 cells by verapamil in response to LAK and NK cells were higher than that of KB cells (P<0.05), but KBV200 and KBVV did not significantly differ (P>0.05). At the same E/T ratio, LAK cells possessed stronger cytotoxicity than NK cells against all the tumor cell lines (P<0.05). CONCLUSIONS: Immunologic effector cells possess strong cytotoxic activity against multidrug-resistant cell line KBV200. Modulation of MDR does not decrease the cytotoxic activity of the immunologic effector cells. The results of this study suggest that adoptive cell immunotherapy with immunologic effector cells may be of value in controlling the progress of MDR tumors.     

IL-2激活的TIL对自体肿瘤细胞的杀伤活性及其与LAK细胞活性的比较

肿瘤浸润性淋巴细胞(TIL)经白细胞介素2(IL-2)体外培养后具有很强的体内外抗肿瘤作用,且有一定的靶细胞特异性,其抗肿瘤效果强于淋巴因子激活的杀伤细胞即LAK细胞(P<0.01)。从瘤体中新鲜分离到的TIL对自体肿瘤细胞的杀伤活性极低,经IL-2体外培养后,其杀伤活性逐渐增高,以培养至7～25d的杀伤活性最强,这与IL-2使TIL分泌3种抗癌淋巴因子包括IL-2、IFN-γ、淋巴毒素(LT)增加有关。体外培养25d后,TIL的抗肿瘤活性下降,实验表明这与培养过程中TIL的Lyt-2~+细胞(Tc)减少而L3T4~+细胞(T_H)增多有关。TIL经冻存复苏和IL-2体外培养后仍保持很强的抗肿瘤活性,冻存前后比较未见显著差异(P>0.05),这为间断地运用TIL治疗复发性、晚期肿瘤提供了一条可行的途径。     

淋巴因子水平改变与妊高征的关系

近年来的研究结果发现由Th1/Th2细胞分泌的淋巴因子与妊娠高血压综合征联系密切 ,可能参与了其病因及病理生理过程 ,对它的深入研究有利于妊娠高血压综合征诊断、治疗水平的提高     

三种淋巴因子在重组痘苗病毒中的表达及其对重组病毒…

研究了巨噬细胞游走抑制因子，白细胞介素及白细胞介素２等三种淋巴因子分别在含有甲型肝炎病毒基因的重组痘苗病毒中表达后，对病毒毒力及免疫效果的影响。使用Ｂａｌｂ／Ｃ小鼠和家兔进行免疫的初步结果显示，表达ＩＬ－６的重组痘苗病毒免疫后特异性抗体反应明显增强，痘苗病毒抗体及甲型肝炎病毒抗体阳转小鼠数量分别由对照的３／１０和１／１０提高到８／１０和７／１０，痘苗病毒和甲型肝炎及病毒抗体滴度也明显升高。