Jourdan Michel, Veyrune Jean-Luc, De Vos John, Redal Nicole, Couderc Guilhem, Klein Bernard
INSERM U475 and Unit for Cellular Therapy, CHU Montpellier, 34197 Montpellier, France.
Oncogene. 2003 May 15;22(19):2950-9. doi: 10.1038/sj.onc.1206423.
Interleukin-6 (IL-6) is a major survival factor for malignant plasma cells involved in multiple myeloma. Using an RNase protection assay, we looked for gene expression of 10 anti- and proapoptotic Bcl-2-family proteins in 12 IL-6-dependent human myeloma cell lines (HMCL). A high Mcl-1 gene expression was found in all HMCLs and the other genes were variably expressed. Out of the 10 Bcl-2-family members, only the Mcl-1 gene was regulated by IL-6. Upon starvation of IL-6, Mcl-1 gene expression decreased in association with myeloma cell apoptosis and was upregulated after adding IL-6 again in association with myeloma cell survival. A constitutive Mcl-1 expression was induced with an Mcl-1-GFP retrovirus in two IL-6-dependent HMCLs. The Mcl-1 HMCLs have a marked reduced apoptosis upon IL-6 starvation compared to HMCLs transduced with control GFP retrovirus and may grow without adding IL-6. These data emphasize the major role of Mcl-1 antiapoptotic protein in the IL-6-induced survival of human myeloma cells.
白细胞介素-6(IL-6)是参与多发性骨髓瘤的恶性浆细胞的主要生存因子。我们使用核糖核酸酶保护分析方法,在12种依赖IL-6的人骨髓瘤细胞系(HMCL)中寻找10种抗凋亡和促凋亡Bcl-2家族蛋白的基因表达。在所有HMCL中均发现Mcl-1基因高表达,其他基因表达则各不相同。在10个Bcl-2家族成员中,只有Mcl-1基因受IL-6调控。在IL-6饥饿时,Mcl-1基因表达随骨髓瘤细胞凋亡而降低,再次添加IL-6后随骨髓瘤细胞存活而上调。用Mcl-1-GFP逆转录病毒在两种依赖IL-6的HMCL中诱导组成性Mcl-1表达。与用对照GFP逆转录病毒转导的HMCL相比,Mcl-1 HMCL在IL-6饥饿时凋亡明显减少,且可不添加IL-6而生长。这些数据强调了Mcl-1抗凋亡蛋白在IL-6诱导的人骨髓瘤细胞存活中的主要作用。