CpTPx was transfected to COS-7 cells.
CpTPx mediated higher cell survival rates among the experimental groups.
Potent antioxidant and DNA damage protection activity of CpTPx are conserved in cells.
Apoptotic change was reduced in CpTPx transfected COS-7 after irradiation.
Transfected CpTPx contribute to radioprotection in COS-7 cells.