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자료유형
학술저널
저자정보
Yang, Ji-Won (BK21 Project Team, College of Pharmacy, Chosun University) Kim, Mi-Ra (BK21 Project Team, College of Pharmacy, Chosun University) kim, Hyung-Gyoon (BK21 Project Team, College of Pharmacy, Chosun University) Kim, Sang-Kyum (College of Pharmacy and Research Center for Transgenic Cloned Pigs, Chungnam National University) Jeong, Hye-Gwang (BK21 Project Team, College of Pharmacy, Chosun University) Kang, Keon-Wook (BK21 Project Team, College of Pharmacy, Chosun University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제31권 제3호
발행연도
2008.1
수록면
350 - 356 (7page)

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Acquired resistance to tamoxifen (TAM) is a serious therapeutic problem in breast cancer patients, and Her-2/ErbB2 expression is associated with decreased sensitivity to TAM. We previously reported that cAMP-dependent protein kinase (PKA)-mediated activator protein-2 (AP-2) activation was responsible for the expression of Her-2/ErbB2 in p53-inactivated mammary epithelial cells (Yang et al., 2006). In the present study, we tested the hypothesis that PKA plays a role in the expression of ErbB2 in tamoxifen-resistant breast cancer cells. Treatment with H-89, a specific PKA inhibitor, suppressed 4-hydroxytamoxifen-induced ErbB2 expression in control MCF-7 cells. In contrast, PKA inhibition by H-89 or cAMP-dependent protein kinase inhibitor $I{\gamma}$ overexpression increased the expression levels of ErbB2 in TAM-resistant MCF-7 (TAMR-MCF-7) cells. Transcriptional regulation of the erbB2 gene depends on two transcription factors, AP-2 and polyomavirus enhancer activator3 (PEA3). H-89 decreased nuclear or total levels of PEA3 in TAMR-MCF-7 cells. Chromatin immunoprecipitation assay results revealed that H-89 treatment reduced PEA3 binding to the proximal Ets binding site of the erbB2 gene promoter. Reporter gene analyses using human erbB2 gene promoter supported the critical role of PEA3 in the overexpression of ErbB2 in TAMR-MCF-7 cells treated with H-89. This deregulated PKA signaling cascades required for the ErbB2 expression may be important for the differential response of TAM-resistant breast cancer cells to EGF/ErbB2 stimuli.

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