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Effects of Bush Sophora Root polysaccharide and its sulfate on DHAV-1 replication

Chen, Yun, Yang, Yuhui, Yuan, Wenjuan, Wang, Zhaohui, Ming, Ke, Zeng, Ling, Liu, Jiaguo
Carbohydrate polymers 2018 v.197 pp. 508-514
Duck hepatitis A virus, RNA, Sophora, Western blotting, ducklings, polysaccharides, quantitative polymerase chain reaction, reverse transcriptase polymerase chain reaction, sulfates, viruses
Duck hepatitis A virus type 1 (DHAV-1) is a mortal virus to ducklings under three weeks old. Bush sophora root polysaccharide (BSRPS) and its sulfate, sulfated BSRPS (sBSRPS), inhibited the replication of DHAV-1. However the detailed mechanisms were still unknown. The protein translation and RNA synthesis are two most important steps of the replication. Additionally, DHAV-1 3D protein, cellular Hsp70 protein, and DHAV-1 IRES were the important regulatory factors. Therefore, the influence of BSRPS and sBSRPS on DHAV-1 protein translation and RNA synthesis were studied. RT-qPCR, western blot, and dual-luciferase reporter system were used to study the inhibition mechanisms of BSRPS and sBSRPS on DHAV-1. The results showed both BSRPS and sBSRPS significantly inhibited the DHAV-1 protein translation and RNA synthesis, and the effect of sBSRPS was stronger. Furthermore, they dropped the protein translation via suppressing DHAV-1 IRES activity and dropped the DHAV-1 synthesis via suppressing cellular Hsp70 expression.