CAJ | 학술논문

目的:观察吉西他滨对荷B细胞淋巴瘤小鼠脾脏中髓源抑制性细胞(myeloid derived suppressor cell,MDSC)的影响,以及吉西他滨化疗联合树突状细胞(dendrilic cells,DCs)治疗巨大淋巴瘤的疗效.方法:小鼠皮下接种A20淋巴瘤细胞,30 d后形成巨大肿瘤,流式细胞仪分析吉西他滨化疗前后荷瘤小鼠脾脏中Gr-1~+CD11b~+MDSC的比例,免疫磁珠纯化的脾脏MDSC体外加入吉西他滨共培养后,Annexin-V/PI标记法检测细胞凋亡;观察荷瘤小鼠接受吉西他滨化疗联合DCs瘤内注射后肿瘤生长情况及小鼠存活期.结果:荷A20淋巴瘤小鼠脾脏中MDSC的比例显著上调.是正常小鼠脾脏中的10倍以上.体外吉西他滨时间依赖性诱导MDSC凋亡与坏死;荷瘤小鼠体内注射吉西他滨后,脾脏中绝大部分的MDSC被清除.单独吉西他滨注射或DCs瘤内注射对肿瘤生长产生一定的抑制作用,小鼠平均存活天数分别为(48.8±3.6)d和(47.2±7.4)d,而对照组小鼠平均存活天数为(38.8±2.2)d;吉西他滨化疔联合DCs瘤内注射后瘤体持续显著缩小,60%小鼠存活时间均超过90 d.结论:吉西他滨可有效清除荷瘤小鼠脾脏MDSC,吉西他滨化疗与DCs瘤内注射免疫治疗具有协同效应,可以提高对巨大淋巴瘤的疗效,本实验为应用生物化疗综合治疗模式治疗复发、难治性淋巴瘤提供了实验依据.
목적:관찰길서타빈대하B세포림파류소서비장중수원억제성세포(myeloid derived suppressor cell,MDSC)적영향,이급길서타빈화료연합수돌상세포(dendrilic cells,DCs)치료거대림파류적료효.방법:소서피하접충A20림파류세포,30 d후형성거대종류,류식세포의분석길서타빈화료전후하류소서비장중Gr-1~+CD11b~+MDSC적비례,면역자주순화적비장MDSC체외가입길서타빈공배양후,Annexin-V/PI표기법검측세포조망;관찰하류소서접수길서타빈화료연합DCs류내주사후종류생장정황급소서존활기.결과:하A20림파류소서비장중MDSC적비례현저상조.시정상소서비장중적10배이상.체외길서타빈시간의뢰성유도MDSC조망여배사;하류소서체내주사길서타빈후,비장중절대부분적MDSC피청제.단독길서타빈주사혹DCs류내주사대종류생장산생일정적억제작용,소서평균존활천수분별위(48.8±3.6)d화(47.2±7.4)d,이대조조소서평균존활천수위(38.8±2.2)d;길서타빈화정연합DCs류내주사후류체지속현저축소,60%소서존활시간균초과90 d.결론:길서타빈가유효청제하류소서비장MDSC,길서타빈화료여DCs류내주사면역치료구유협동효응,가이제고대거대림파류적료효,본실험위응용생물화료종합치료모식치료복발、난치성림파류제공료실험의거.
Objective:To investigate the effect of gemcitabine on myeloid derived suppressor cells (MDSC) in the spleen of B lymphoma cell-bearing mice, and the therapeutic effect of gemcitabine combined with intratumoral injection of dendritic cells (DCs) in treatment of large B lymphoma. Methods: BALB/c mice were inoculated subcutaneously with B lymphoma A20 cells; large tumors were formed 30 d after inoculation. Gr-1~+ CD11b~+ MDSC proportion in the spleen was analyzed by flow cytometry before and after gemcitabine treatment. Splenic MDSC sorted by immunomagnetic beads was further treated with gemcitabine, and then the apoptosis of MDSC was examined by Annexin-V/PI staining. Tumor growth and survival time of A20 tumor-bearing mice were observed after treatment with gemcitabine and intratumoral injection of DCs. Results: Splenic Gr-1~+ CD11b~+ MDSC ratio in A20 cell-bearing mice was 10 times higher than that in the normal mice. Gemcitabine induced apoptosis and necrosis of purified MDSC in vitro in a time-dependent manner. The percentage of MDSC in the spleen of A20 tumor-bearing mice was decreased after injection of a single dose of gemcitabine. Gemcit-abine or intratumoral injection of DCs alone inhibited growth of tumor to a certain degree, with the mean survival periods of mice in the gemcitabine, DCs, and untreated groups being (48.8±3.6) d, (47.2±7.4) d, and (38.8±2.2) d, respectively. Gemcitabine chemotherapy combined with intratumoral DC injection resulted in continuous shrink of the tumors, and 60% of the mice survived for more than 90 d. Conclusion: Gemcitabine can effectively eliminate splenic MDSC in tumor-bearing mice. Gemcitabine chemotherapy and DCs immunotherapy can work synergistically in the treat-ment of huge lymphoma. These results provide an experimental basis for the comprehensive chemotherapy and immunotber-apy of relapsed or refractory lymphoma.