Targeting hormone-resistant breast cancer cells with docetaxel: a look inside the resistance
Alexander M. Scherbakov , Anna A. Basharina , Danila V. Sorokin , Ekaterina I. Mikhaevich , Iman E. Mizaeva , Alexandra L. Mikhaylova , Tatiana A. Bogush , Mikhail A. Krasil’nikov
Cancer Drug Resistance ›› 2023, Vol. 6 ›› Issue (1) : 103 -15.
Aim: The study aims to analyze the effect of long-term incubation of ERα-positive MCF7 breast cancer cells with 4-hydroxytamoxifen (HT) on their sensitivity to tubulin polymerization inhibitor docetaxel.
Methods: The analysis of cell viability was performed by the MTT method. The expression of signaling proteins was analyzed by immunoblotting and flow cytometry. ERα activity was evaluated by gene reporter assay. To establish hormone-resistant subline MCF7, breast cancer cells were treated with 4-hydroxytamoxifen for 12 months.
Results: The developed MCF7/HT subline has lost sensitivity to 4-hydroxytamoxifen, and the resistance index was 2. Increased Akt activity (2.2-fold) and decreased ERα expression (1.5-fold) were revealed in MCF7/HT cells. The activity of the estrogen receptor α was reduced (1.5-fold) in MCF7/HT. Evaluation of class III β-tubulin expression (TUBB3), a marker associated with metastasis, revealed the following trends: higher expression of TUBB3 was detected in triple-negative breast cancer MDA-MB-231 cells compared to hormone-responsive MCF7 cells
Conclusion: Further development of taxane-based chemotherapy for hormone-resistant cancer looks highly promising, especially for cancers with low TUBB3 expression.
Cancer / docetaxel / 4-hydroxytamoxifen / class III β-tubulin / resistance / breast cancer / estrogen receptors alpha
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