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Hedgehog信号通路异常对多发性骨髓瘤化疗耐药的影响 被引量:6

Effect of Hedgehog Signaling Pathway Abnormality on Chemothe-rapeutic Resistance of Multiple Myeloma
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摘要 目的:探讨Hedgehog信号过度活化与多发性骨髓瘤耐药的关系。方法:以浓度梯度递增法建立骨髓瘤耐药细胞株RPMI8226/R,实验分为RPMI8226/R,RPMI8226/S,GANT61+RPMI8226/R和GANT61+RPMI8226/S4组,用CCK8法检测4组细胞的增殖抑制率;RT-PCR检测RPMI8226/S和RPMI8226/R耐药前后Gli1,Gli2,Shh,Ihh,Smo和Sufu mRNA表达的变化;Western blot法检测耐药蛋白Cyclin D1,P21和BCL-2及MDR相关信号通路蛋白p-Akt,p-MAPK和STAT3在耐药前后两组细胞的表达。加入不同浓度的GANT61后,Western blot法检测RPMI8226/R,RPMI8226/S组细胞Gli2的表达。结果:Shh、Ihh、Smo、Gli2在RPMI8226/R中表达明显升高,Sufu抑制子则相反,Hedgehog通路下游靶点相关蛋白在RPMI 8226/R中的表达显著高于RPMI8226/S,GANT61体外处理之后,骨髓瘤细胞中Gli2表达量显著减低,GANT61对Gli2表达的减低作用在RPMI8226/R细胞中较RPMI8226/S细胞更为显著,GANT61处理后RPMI8226/R细胞对DOX的敏感性(IC_(50))由7.11±0.061μmol/L升为0.99±0.053μmol/L,相应的耐药指数从5.51降至1.69。结论:Hedgehog信号通路的活化与多发性骨髓瘤的耐药密切相关,GANT61能够阻断Hedgehog信号通路,因此后者可能成为临床克服MM的化疗耐药的一种新的治疗靶点。 Objective: To study the correlation between the excessive activation of Hedgehog signal and the chug resistance of multiple myeloma. Methods : The resistant cell line RPMI 8226/R of multiple myeloma was established by an ascending concentration gradient method. The experiment consisted of 4 groups: RPMI8226/R, RPMI8226/S, GANT61 + RPMI8226/R and GANT61 + RPMI8226/S. The CCK-8 ( cell counting kit-8 ) assay was used to detect the cell proliferation inhibition rate in 4 groups ; the RT-PCR was used to detect the expression of Glil, Gli2, Shh, lhh, Smo and Sufu in the RPMI8226/S and RPMI8226/R cells. The Western blot was used to detect the expression of the resistant protein Cyclin D1, P21 and BCL-2 and MDR-related signaling pathways protein p-Akt, p-MAPK and STAT3 in the RPMI8226/S and RPMI8226/R cells. After adding different concentration of GANT61, the Western blot was used to detect the expression of Gli2 in RPMI8226/R and RPMI8226/S cells. Results: The expression of Shh, lhh, Smo Gli2 was enhanced significantly in the RPMI8226/R cells, but the expression of Sufu inhibitor was reduced, the expression level of related protein in Hedgehog signaling pathway was significanly higher in RPMI8226/R than that in RPMI8226/ S. After theatment of GANT61 in vitro, the expression level of Gli2 in multiple myelom cells obviously decreased, the decreasing effect of GANT61 on Gli2 expression in RPMI8226/R cells was more significant than that in RPMI8226/S cells. The sensitivity of RPMI8226/R cells to DOX after treatment with GANT61 ( IC50 ) was risen from 7.11 ±0.061 μmol/L to 0.99 ±0. 053 μmol/L, the corresponding cell resistance index decreased from 5.51 to 1.69. Conclusion: the activation of Hedgehog signaling pathway is closely related with the resistance of multiple myeloma cells, and GANT61 can block the Hedgehog signaling pathway, thus Hedgehog signaling may be used as a new target for multiple myeloma treatment.
出处 《中国实验血液学杂志》 CAS CSCD 北大核心 2017年第2期465-470,共6页 Journal of Experimental Hematology
基金 福建省卫计委青年课题(编号2014-2-73) 国家自然科学基金(81172246) 福建省创新医学课题(2014-CXB-42)
关键词 HEDGEHOG信号通路 骨髓瘤 耐药 hedgehog signaling pathway multiple myeloma drug resistance
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