BRAF野生型及BRAFV600E突变型的黑色素瘤细胞中Mpsl基因对BRAFWT／MEK／ERK通路的影响  

Study of negative feedback between wild-type BRAF or RAFV600E and Mpsl in melanoma

作　　者：张玲[1,2] 贺婵婷[2] 毕炀辉 刘峰 崔鹤洋 王娟[2] 宋彬[2,4] 师如意[2] 杨斌[2] 王芳[2] 贾志武[2] 赵振祥[2] 刘静[2,5] 

机构地区：[1]山西医科大学基础医学院病理学教研室,太原030001 [2]细胞生理学省部共建教育部重点实验室 [3]法医学院 [4]山西医科大学第一医院肿瘤科 [5]山西医科大学第一医院普外科

出　　处：《中华病理学杂志》2015年第4期274-277,共4页Chinese Journal of Pathology

基　　金：国家自然科学基金（81272189,81201956）

摘　　要：目的：研究野生型BRAF及突变型BRAFV600E背景下Mps1激酶对BRAFWT／MEK／ERK通路的影响。方法（1）在BRAF野生型背景的黑色素瘤细胞中单独或联合转染pBabe-puro-GST-BRAF-WT／pBabe-puro-GST-BRAFV600E、pBabe-puro-GFP-Mps1-WT 及空载体，应用 Western blot方法来检测 Mps1及 p-ERK 表达水平。（2）用 pSUPER-Mps1反转录病毒感染 BRAF 野生型及BRAFV600E突变型背景黑色素瘤细胞，敲低内源性Mps1，Western blot法检测Mps1及p-ERK表达水平。（3）在BRAFV600E突变型背景的黑色素瘤细胞中转染pBabe-puro-GFP-Mps1，Western blot法检测Mps1及p-ERK表达水平。结果（1）在BRAF野生型背景的黑色素瘤细胞中转染pBabe-puro-GST-BRAF-WT及pBabe-puro-GFP-Mps1-WT，与未处理组及转染空载体组相比，p-ERK水平显著降低（ P＜0．01）；在BRAF野生型背景的黑色素瘤细胞中转染pBabe-puro-GST-BRAFV600E及pBabe-puro-GFP-Mps1-WT，与未处理组及转染空载体组相比，p-ERK表达水平未发生明显变化。（2）在BRAF野生型背景的黑色素瘤细胞中敲低内源性Mps1后，与对照组相比p-ERK含量增多；而在BRAFV600E突变型黑色素瘤细胞中敲低内源性Mps1后，与对照组相比p-ERK含量未发生明显变化。（3）转染Mps1的BRAFV600E突变型细胞中 p-ERK 水平较对照组及空载体组没有发生显著变化。结论Mps1激酶和BRAFWT／MEK／ERK通路之间存在一条自动调节的负反馈回路，Objective To study the effect of Mps1 on BRAFWT/MEK/ERK pathway in the presence of wild type BRAF or BRAFV600E in melanoma.Methods Melanoma cells harboring BRAFWT genotype were transfected either with pBabe-puro-GST-BRAF-WT and/or pBabe-puro-GFP-Mps1-WT or pBabe-puro-GST-BRAFV600E and/or pBabe-puro-GFP-Mps1-WT, followed by Western blot to detect Mps1 and p-ERK expression.The melanoma cells harboring BRAFWT and BRAFV600E genotype were infected with pSUPER-Mps1 retrovirus to knockdown the endogenous Mps1 protein, followed by Western blot to detect Mps1 and p-ERK expression.Meanwhile, melanoma cells harboring BRAFV600E genotype were infected with pBabe-puro-GFP-Mps1 and Western blot was performed to detect Mps1 and p-ERK expression. Results In melanoma cells harboring BRAFWT genotype and transfected with pBabe-puro-GST-BRAF-WT and pBabe-puro-GFP-Mps1-WT, phospho-ERK levels were notably reduced as compared to either negative control or empty vector.However, cells transfected with pBabe-puro-GST-BRAFV600E and pBabe-puro-GFP-Mps1-WT, phospho-ERK levels did not change significantly compared with either negative control or empty vector.Knockout of Mps1 in BRAF wild-type cell lines led to an increased ERK activity.However, there was no significant change of ERK activity in BRAFV600E cell lines in the absence of Mps1.The expression of p-ERK in BRAFV600E mutant cell lines infected with pBabe-puro-GFP-Mps1-WT did not show any significant difference from either negative control or empty vector. Conclusions Based on these findings, it suggests that there exists an auto-regulatory negative feedback loop between the Mps1 kinase and BRAFWT/ERK signaling.Oncogenic BRAFV600E abrogates the regulatory negative feedback loop of Mps1 on the MAPK pathway.

关 键 词：黑色素瘤 转染 印迹法 蛋白质 

分 类 号：R739.5[医药卫生—肿瘤]