Epigallocatechin gallate inhibits the growth of human lung cancer by directly targeting the EGFR signaling pathway
Epigallocatechin gallate (EGCG), the major biologically active compound in green tea, is a well-known chemoprevention agent. Although several reports have shown that EGCG exerts its anticancer activity by targeting specific cell signaling pathways, the underlying molecular mechanism(s)
are only partially understood. In the present study, we report that EGCG had a profound antiproliferative effect on human lung cancer cells. EGCG inhibited anchorage-independent growth and induced cell cycle G0/G1 phase arrest. The mechanism underlying EGCG antitumor potency was mainly dependent
on suppression of the EGFR signaling pathway. Short-term EGCG exposure substantially decreased EGF-induced EGFR, AKT and ERK1/2 activation. Moreover, long-term EGCG treatment not only inhibited total and membranous EGFR expression, but also markedly attenuated EGFR nuclear localization and
expression of the downstream target gene cyclin D1, indicating that EGCG treatment suppressed EGFR transactivation. Additionally, knockdown of EGFR in lung cancer cells decreased their sensitivity to EGCG. Thus, inhibition of the EGFR signaling pathway may partly contribute to the anticancer
activity of EGCG.
Document Type: Research Article
Affiliations: 1: Department of Cardiothoracic Surgery, The Third Xiangya Hospital, Central South University, Changsha 410013, P.R. China 2: Key Laboratory of Cancer Proteomics of the Chinese Ministry of Health, Xiangya Hospital, Central South University, Changsha 410008, P.R. China 3: Department of Ultrasound, The Third Xiangya Hospital, Central South University, Changsha 410013, P.R. China
Publication date: 01 March 2014
- Oncology Reports is a monthly, peer-reviewed journal devoted to the publication of high quality original studies and reviews concerning a broad and comprehensive view of fundamental and applied research in oncology, focusing on carcinogenesis, metastasis and epidemiology.
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