Implication of α2β1 integrin in anoikis of MCF-7 human breast carcinoma cells

• Published in: Biochemistry (Moscow) 2015, Vol.80 (1), p.97-103
• Main Authors: Morozevich, G. E., Kozlova, N. I., Susova, O. Y., Karalkin, P. A., Berman, A. E.
• Format: Article
• Language: English
• Subjects: Anoikis; Apoptosis; Biochemistry; Biomedical and Life Sciences; Biomedicine; Bioorganic Chemistry; Breast cancer; Breast Neoplasms - enzymology; Breast Neoplasms - metabolism; Cancer; Cancer cells; Cell research; Cyclin-Dependent Kinase Inhibitor p27 - metabolism; Extracellular Signal-Regulated MAP Kinases - metabolism; Female; Health aspects; Humans; Integrin alpha2beta1 - physiology; Integrins; Life Sciences; MAP Kinase Signaling System; MCF-7 Cells; Microbiology; Oncology, Experimental; Physiological aspects; Tumor Suppressor Protein p53 - metabolism
• ISSN: 0006-2979; 1608-3040
• DOI: 10.1134/S0006297915010113

Silencing of α2β1 integrin expression significantly promoted anchorage-dependent apoptosis (anoikis) and drastically reduced clonal activity of MCF-7 human breast carcinoma cells. Depletion of α2β1 enhanced the production of apoptotic protein p53 and of inhibitor of cyclin-dependent protein kinases, p27, while downregulating antiapoptotic protein Bcl-2 and multifunctional protein cMyc. Blocking the expression of α2β1 had no effect on activity of protein kinase Akt, but it sharply increased the kinase activity of Erk1/2. Pharmacological inhibition of Erk1/2 had a minor effect on anoikis of control cells, while it reduced anoikis of cells with downregulated α2β1 to the level of control cells. The data show for the first time that integrin α2β1 is implicated in the protection of tumor cells from anoikis through a mechanism based on the inhibition of protein kinase Erk.