NA808 is an Serine Palmitoyltransferase ( SPT ) inhibitor. NA808 reduces sphingomyelin synthesis, inhibits its activation in hepatic stellate cells, and decreases the expression of α-SMA protein and mRNA , as well as collagen 1A1 mRNA ( IC 50 0.16, 0.12, and 0.11 μM, respectively). NA808 inhibits HCV replication and reduces NS3 and RdRp protein expression in HCV replicon cells without significant cytotoxicity and exhibits almost no immunosuppressive effect at effective concentrations. NA808 demonstrates broad-spectrum antiviral activity in humanized chimeric liver mice infected with various HCV genotypes, and dose-dependently reduces serum and hepatic HCV RNA levels. NA808 can be used for research on non-alcoholic steatohepatitis and hepatitis C virus infection .
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