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Anti-viral effects of superpositively charged mutant of green fluorescent protein.

R. Vahabpour,Parya Basimi,F. Roohvand,Hassan Asadi,Gholnaz Mokhtari Irani,R. Zabihollahi,A. Bolhassani

Published 2019 in Protein Peptide Letters

ABSTRACT

BACKGROUND Supercharged GFP proteins were known as effective carriers for delivery of macromolecules into eukaryotic cells as well as fluorescent fusion tags for in vitro and in vivo detection. OBJECTIVE Herein, anti-viral effects of +36 GFP and its anti-tumor effects were studied in vitro and in vivo, respectively. METHOD We evaluated anti-HIV, anti-HSV, and anti-HCV effects of +36 GFP in vitro using ELISA, and real time PCR as common techniques for their detection, respectively. Moreover, we assessed the role of +36 GFP for eliciting HPV-related anti-tumor effects in mice due to the lack of HPV replication in vitro. RESULTS Our data showed that +36 GFP efficiently enter the cells and augment the transfection rate of HPV16E7 antigen, as well. Furthermore, +36 GFP significantly reduced HCV, HIV and HSV replication up to 75%, 49% and 43% in HCV-infected Huh7.5 cells, HIV-infected Hela cells and HSV-infected Vero cells, respectively. On the other hand, mice immunization with +36 GFP complexed with HPV16 E7 antigen (+36GFP + E7) or fused to HPV16 E7 antigen (+36GFP-E7) elicited a higher Th1 cellular immune response with the predominant IgG2a, IgG2b, IFN-γ and Granzyme B levels than those induced by other groups. These regimens protected mice against TC-1 tumor challenge (~ 67%) compared to E7 protein alone (~ 33%). These data suggested that +36 GFP can act as an anti-viral agent at certain dose due to its high efficiency in cell penetration in vitro and in vivo. CONCLUSION Generally, +36 GFP targets viral replication in vitro as well as helps to suppress the growth of HPV-related tumors in vivo.

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