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Updated: Jul 18, 2026

Modeling Breast Cancer via an Intraductal Injection of Cre-expressing Adenovirus into the Mouse Mammary Gland
Published on: June 7, 2019
ErbB2 overexpression in p53-inactivated mammary epithelial cells
Jin Won Yang1, Eva Y-H P Lee, Keon Wook Kang
1BK21 Project Team, College of Pharmacy, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, South Korea.
Abstract:
Functional loss of p53 and ErbB2 overexpression are the frequent genetic alterations in human breast carcinomas. Here, we found that ErbB2 expression was upregulated in primary cultured mammary epithelial cells (MECs) isolated from mice with a defect in exons 5 and 6 of the p53 gene (p53(Delta5,6)). The reporter gene activity in the p53(Delta5,6) MECs transfected with the -756bp flanking region of the hErbB2 gene was higher than the wild type MECs. p53 inactivation selectively increased the level of AP-2alpha, but not AP-2beta and AP-2gamma and a mutation of the two AP-2 binding sites completely inhibited the reporter activity.
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