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Interferon (IFN) regulates immune responses and antitumor activity. Arginine-glycine-aspartic acid (RGD) peptides can specifically bind to integrin αvβ3, a transmembrane receptor that is highly expressed on the surface of various cancer cells. In this study, we expressed recombinant RGD-IFN-α2a-core fusion proteins and assessed their antitumor activity in vitro. Two RGD-IFN-α2a-core fusion proteins and a negative control protein were expressed in vitro. These two RGD-IFN-α2a-core fusion proteins could bind the tumor cell surface specifically and did not bind to normal cells. RGD-IFN-α2a-core fusion protein treatment of tumor cells significantly reduced cell viability and induced apoptosis in a dose-dependent manner. At the 'mRNA' level, both proteins could upregulate CASP3 expression. These data indicate that both laboratory-engineered RGD-IFN-α2a-core fusion proteins could bind the surface of tumor cells and induce apoptosis in vitro. Further studies will investigate the in-vivo antitumor activities of the RGD-IFN-α2a-core fusion proteins.

Antitumor activity of recombinant RGD-IFN-α2a-core fusion protein in vitro