Upregulation of the EGFR/MEK1/MAPK1/2 signaling axis as a mechanism of resistance to antiestrogen‑induced BimEL dependent apoptosis in ER + breast cancer cells.

Autor:	Hagan ML; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Mander S; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Joseph C; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., McGrath M; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Barrett A; Department of Pathology, Augusta University, Augusta, GA 30912, USA., Lewis A; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Hill WD; Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA., Browning D; Medical College of Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA., McGee-Lawrence ME; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Cai H; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Liu K; Medical College of Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA., Barrett JT; Medical College of Georgia Cancer Center, Augusta University, Augusta, GA 30912, USA., Gewirtz DA; Department of Pharmacology and Toxicology, Massey Cancer Center, Richmond, VA 23298, USA., Thangaraju M; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA., Schoenlein PV; Department of Cellular Biology and Anatomy, Augusta University, Augusta, GA 30912, USA.
Jazyk:	angličtina
Zdroj:	International journal of oncology [Int J Oncol] 2023 Feb; Vol. 62 (2). Date of Electronic Publication: 2022 Dec 16.
DOI:	10.3892/ijo.2022.5468
Abstrakt:	The epidermal growth factor receptor (EGFR) is commonly upregulated in multiple cancer types, including breast cancer. In the present study, evidence is provided in support of the premise that upregulation of the EGFR/MEK1/MAPK1/2 signaling axis during antiestrogen treatment facilitates the escape of breast cancer cells from BimEL‑dependent apoptosis, conferring resistance to therapy. This conclusion is based on the findings that ectopic BimEL cDNA overexpression and confocal imaging studies confirm the pro‑apoptotic role of BimEL in ERα expressing breast cancer cells and that upregulated EGFR/MEK1/MAPK1/2 signaling blocks BimEL pro‑apoptotic action in an antiestrogen‑resistant breast cancer cell model. In addition, the present study identified a pro‑survival role for autophagy in antiestrogen resistance while EGFR inhibitor studies demonstrated that a significant percentage of antiestrogen‑resistant breast cancer cells survive EGFR targeting by pro‑survival autophagy. These pre‑clinical studies establish the possibility that targeting both the MEK1/MAPK1/2 signaling axis and pro‑survival autophagy may be required to eradicate breast cancer cell survival and prevent the development of antiestrogen resistance following hormone treatments. The present study uniquely identified EGFR upregulation as one of the mechanisms breast cancer cells utilize to evade the cytotoxic effects of antiestrogens mediated through BimEL‑dependent apoptosis.
Databáze:	MEDLINE
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