TLR3途径诱导多发性骨髓瘤细胞株增殖抑制和凋亡机制研究

目的 研究聚肌苷酸胞苷酸( polyI:C)激活的TLR3通路对多发性骨髓瘤RPMI8226细胞的增殖抑制和凋亡相关的生物学作用及相关机制.方法 RPMI8226细胞培养于RPMI 1640培养基,以不同浓度的polyI:C与该细胞作用不同的时间.收集细胞后,分别利用CCK-8和流式细胞术分析其增殖抑制和凋亡情况,同时抽提总RNA,相对定量PCR测定TLR3通路相关基因表达.结果 PolyI:C对RPMI8226的增殖抑制效应随着作用剂量的增加和时间的延长而增加,24h:12.30％±2.04％、22.50％±2.20％、37.90％±1.30％;48h:17.80％±1.52％、29.60±0.85％、45.80％±1.68％;72 h:25.10％±1.01％、34.60％±1.27％、60.50％±2.08％,差异有统计学意义(P＜0.05).浓度为50、100、200μg/ml的polyl:C与RPMI8226作用48 h后,细胞凋亡率分别为5.60％±1.06％、8.71％±1.06％、13.93％±1.17％,差异具有统计学意义(P＜0.05),而且随着polyI:C作用浓度增加,RPMI8226细胞中TLR3和TRIF mRNA相对于内参β-actin的表达均显著增高,TLR3:1.41±0.10、2.24±0.16、4.08±0.13;TRIF:1.07±0.16、1.97±0.13、3.56±0.19,各组间差异具有统计学意义(P＜0.05).结论 TLR3途径可以有效地抑制多发性骨髓瘤细胞增殖,并且诱导其凋亡,对多发性骨髓瘤的生物治疗具有潜在应用价值.

Growth inhibition and apoptosis of a multiple myeloma cell line induced by TLR3 pathway activation

Objective To investigate the roles of TLR3 pathway activiated by polyI:C in proliferation and apoptosis of multiple myeloma (MM) RPMI8226 cell line.Methods RPMI8226 cells were cultured in RPMI 1640 with different dose of polyl:C.Cells were collected in different time.Proliferation and apoptosis were detected by CCK-8 kit and flow cytometry,separately.Results The proliferation of RPM18226 was inhibited by polyI:C,and it was dose and time dependent,24 h:12.30％ ±2.04％,22.50％±2.20％,37.90％ ±1.30％ ; 48 h:17.80％ ±1.52％,29.60％ ±0.85％,45.80％ ±1.68％ ;72 h:25.10％±1.01％,34.60％±1.27％,60.50％±2.08％,P＜0.05.RPMI8226 cells were incubated with 50 μg/ml,100 μg/ml and 200 μg/ml polyI:C for 48 h.Apoptotic rate were 5.60％ ±1.06％,8.71％ ±1.06％ and 13.93％ ±1.17％,P＜0.05.TLR3 and TRIF mRNA expression increased obviously and dose dependent,TLR3:1.41±0.10,2.24±0.16,4.08±0.13; TRIF:1.07±0.16,1.97±0.13,3.56±0.19,P＜0.05.Conclusion The proliferation of MM cells were inhibited by TLR3 pathway obviously,and apoptosis was induced by polyI:C.