慢性乙型肝炎患者T淋巴细胞激活诱导的细胞死亡

Activation-induced cell death in peripheral blood T-lymphocytes from patients with chronic hepatitis B

目的 研究慢性乙型肝炎患者外周血T淋巴细胞 (PBL T)激活诱导细胞死亡 (AICD)的发生情况 ,探讨AICD在慢性乙型肝炎发病机制中的作用。方法 采用免疫磁珠技术负性分离 14例慢性乙型肝炎患者和 9例正常人PBL T ,应用抗CD3单克隆抗体、佛波醇 (PMA)及离子霉素 (iono mycin)体外诱导细胞活化 ;采用脱氧核苷酸转移酶介导的dUTP切口末端标记 (TUNEL)染色观察凋亡情况并用流式细胞仪检测凋亡率。结果 慢性乙型肝炎患者诱导组PBL T凋亡率为 (16.73±0 .99) % ,明显高于未诱导组 (9.74± 1.14 ) % ,P <0 .0 1。无论是否诱导 ,患者PBL T的凋亡率均高于健康人。培养上清液中IFN γ浓度与T细胞凋亡率成负相关 (P <0 .0 1) ,而各组IL 10的浓度差异无显著性 (P >0 .0 5 )。结论 慢性乙型肝炎患者PBL T存在AICD现象 。

Objective To study the activation induced cell death(AICD) in peripheral blood T lymphocytes(PBL T) from patients with chronic hepatitis B(CHB), and the role of AICD in the pathogenesis of chronic hepatitis B. Methods The PBL Ts of 14 patients were isolated with negative selection by magnetic beads, and cultured with or without anti CD3 mAb in the presence of PMA and ionomycin. The apoptosis of PBL T was observed by TUNEL staining and assessed by Flow Cytometry. Results In CHB patients, the apoptotic rate of PBL T activated with anti CD3 mAb was significantly higher than that of without activation (16.73%±0.99% vs. 9.74%±1.14%, P <0.01); Apoptotic rate of PBL T in CHB patients either with or without activation was higher than that of healthy control( P <0.01).There was no difference between the two groups in level of IL 10( F =0.1389, P >0.05), and a negative correlation existed between the level of INFγ and apoptotic rate of T cell( r =-0.87126, P <0.001, Y=1924.38-56.39X). Conclusions Activation induced cell death in peripheral T cells exists in chronic hepatitis B virus infection, and it may play an important role in the pathogenesis, especially in the persistence, of chronic HBV infection.