Tumor promotion resistant cells are deficient in AP-1 DNA binding, JunD DNA binding and JunD expression and form different AP-1-DNA complexes than promotion sensitive cells

被引:20
作者
Bernstein, LR [1 ]
Walker, SE [1 ]
机构
[1] Texas A&M Univ, Hlth Sci Ctr, Dept Pathol & Lab Med, College Stn, TX 77843 USA
来源
BIOCHIMICA ET BIOPHYSICA ACTA-GENE STRUCTURE AND EXPRESSION | 1999年 / 1489卷 / 2-3期
关键词
AP-1; TPA; tumor promotion; JB6; Jun; Fos;
D O I
10.1016/S0167-4781(99)00191-8
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The JB6 cell culture model is used to identify molecular: determinants of susceptibility to the promotion of neoplastic transformation. Clonal variants susceptible to transformation ('P+' cells) form numerous anchorage-independent colonies in soft agar upon treatment with the phorbol eater tumor promoter TPA, whereas resistant variants ('P-' cells) do not. We now report that there is significantly less binding of activator protein-1 (AP-1) to its DNA binding site in P- cells than in P+ cells. Gel supershift assays were performed to detect association of all seven AP-1 family members with their DNA binding site in TPA-treated and -untreated P+ and P- cells. Significantly lower DNA binding and protein expression of JunD were detected in P- cells than in P+ cells, c-Jun was detected in P+, but not P-, AP-I-DNA complexes, and c-Fos was detected in P-, but not P+, AP-1-DNA complexes. These and other phenotype-specific differences in abundance and composition of AP-1-DNA complexes may play a role in the resistance of P- cells to tumor promoter-induced transformation. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:263 / 280
页数:18
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