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    • 64. 发明授权
    • cMYC is regulated by Tcf-4
    • C-MYC受TCF-4监管
    • US6140052A
    • 2000-10-31
    • US136605
    • 1998-08-20
    • Tong-Chuan HeBert VogelsteinKenneth W. Kinzler
    • Tong-Chuan HeBert VogelsteinKenneth W. Kinzler
    • C12N15/09A61K31/711A61K38/00A61K45/00A61K48/00A61P35/00C07K14/47C12N15/12C12Q1/02C12Q1/68G01N33/15G01N33/50C12N5/10
    • C07K14/47C07K14/4705C12Q1/6897A61K38/00A61K48/00
    • The APC tumor suppressor protein binds to .beta.-catenin, a protein recently shown to interact with Tcf/Lef transcription factors. Here, the gene encoding a Tcf family member that is expressed in colonic epithelium (hTcf-4) was cloned and characterized. hTcf-4 transactivates transcription only when associated with .beta.-catenin. Nuclei of APC.sup.-/- colon carcinoma cells were found to contain a stable .beta.-catenin-hTCF-4 complex that was constitutively active, as measured by transcription of a Tcf reporter gene. Reintroduction of APC removed .beta.-catenin from hTcf4 and abrogated the transcriptional transactivation. Constitutive transcription of TCF target genes, caused by loss of APC function, may be a crucial event in the early transformation of colonic epithelium. It is also shown here that the products of mutant APC genes found in colorectal tumors are defective in regulating .beta.-catenin/Tcf-4 transcriptional activation. Furthermore, colorectal tumors with intact APC genes were shown to contain subtle activating mutations of .beta.-catenin that altered functionally significant phosphorylation sites. These results indicate that regulation of .beta.-catenin is critical to APC's tumor suppressive effect and that this regulation can be circumvented by mutations in either APC or .beta.-catenin.
    • APC肿瘤抑制蛋白结合β-连环蛋白,最近显示出与Tcf / Lef转录因子相互作用的蛋白质。 这里,克隆并表征编码在结肠上皮(hTcf-4)中表达的Tcf家族成员的基因。 hTcf-4仅在与β-连环蛋白相关时才转录转录。 发现APC - / - 结肠癌细胞的核含有稳定的β-联蛋白-hTCF-4复合物,其通过Tcf报道基因的转录测量而具有组成型活性。 重新引入APC从hTcf4中除去β-连环蛋白,并废除转录反式激活。 由APC功能丧失引起的TCF靶基因的组成转录可能是结肠上皮早期转化的关键事件。 这里还显示,在结肠直肠肿瘤中发现的突变APC基因的产物在调节β-连环蛋白/ Tcf-4转录激活中是缺陷的。 此外,具有完整APC基因的结肠直肠肿瘤显示含有改变功能显着磷酸化位点的β-连环蛋白的微妙活化突变。 这些结果表明,β-连环蛋白的调节对于APC的肿瘤抑制作用至关重要,并且该调节可以通过APC或β-连环蛋白的突变来规避。