Nuclear receptor coactivator 7 (NCOA7) protects cancer cells from oxidative damage through its ERbd domain

Abstract

Oxidative stress causes damage to cancer cells and plays an important role in cancer therapy. Antagonizing oxidative stress is crucial for cancer cells to survive during the oxidation-based therapy. In this study, we defined the role of nuclear receptor co-activator 7 (NCOA7) in anti-oxidation in lung cancer cells and found that NCOA7 protects lung cancer A549 cells from the oxidative damage caused by hydrogen peroxide. Knockdown of NCOA7 in A549 cells significantly enhanced the hydrogen peroxide-caused inhibition of cell proliferation and migration, and markedly increased the damage effect of hydrogen peroxide on F-actin and focal adhesion structure, suggesting that NCOA7 protects F-actin and focal adhesion structure, thus the cell proliferation and migration, from oxidation-caused damage. Mechanistically, the anti-oxidation effect of NCOA7 is mediated by its nuclear receptor binding domain, the ERbd domain, suggesting that the anti-oxidation function of NCOA7 is dependent on its nuclear receptor co-activator activity. Our studies identified NCOA7 as an anti-oxidative protein through its nuclear receptor co-activator function and revealed the mechanism underlying the anti-oxidative effect of NCOA7 on cancer cell proliferation and migration.