Antiviral properties of extracts of Streptomyces sp. SMU 03 isolated from the feces of Elephas maximus.

Antiviral properties of extracts of Streptomyces sp. SMU 03 isolated from the feces of Elephas maximus. Fitoterapia. 2020 Apr 21;:104600 Authors: Li F, Lu S, Xie X, Fan S, Chen D, Wu S, He J Abstract Actinobacteria are historically and continued to be an important source for drug discovery. The annual epidemics and periodic pandemics of humans induced by influenza A virus (IAV) prompted us to develop new effective antiviral drugs with different modes of action. An actinobacterium of Streptomyces sp. SMU 03 was identified from the feces of Elephas maximus in Yunnan Province, China. By employing an H5N1 pseudo-typed virus drug screening system, the anti-IAV effect of the dichloromethane extracts (DCME) of this bacterium was investigated. DCME showed broad and potent activities against several influenza viruses, including the H1N1 and H3N2 subtypes and influenza B virus, with IC50 values ranging from 0.37 ± 0.22 to 14.44 ± 0.79 μg/mL. A detailed modes-of-action study indicated that DCME might interact with the HA2 subunit of hemagglutinin (HA) of IAV by interrupting the fusion process between the viral and host cells' membranes thereby inhibiting the entry of the virus into host cells. Furthermore, the in vivo anti-IAV activity test of DCME showed that compared with the no-drug treated group, the survival rates, appearances, weights, lung indices and histopathological changes were all significantly alleviated. Based on thes...
Source: Fitoterapia - Category: Biochemistry Authors: Tags: Fitoterapia Source Type: research