GS-9620 potently inhibited viral replication in peripheral blood mononuclear cells(PBMCs), particularly when added 24 to 48 hours prior to HIV infection (EC50= 27 nM). Depletion of pDCs, but not other immune cell subsets from PBMC cultures, suppressed GS-9620 antiviral activity.
In vivo
Short-term oral administration of GS-9620 provides long-term suppression of serum and liver HBV DNA. GS-9620 administration induces production of IFN-α and other cytokines and chemokines, and activates ISGs, natural killer cells, and lymphocyte subsets. Its treatment reduces viral DNA, Serum levels of HB surface antigen, HB e antigen and numbers of HBV antigen-positive hepatocytes while hepatocyte apoptosis increases. Currently, GS-9620 is under clinical evaluation for treating chronic HBV infection and for reducing latent reservoirs in virally-suppressed HIV-infected patients.