Bictegravir

Bictegravir (GS 9883) is a novel potent HIV-1 integrase (IN) that specifically targets IN strand transfer activity with IC50 of 7.5 nM; exhibits potent and selective in vitro antiretroviral activity in both T-cell lines and primary human T lymphocytes with EC50 of 1.5-2.4 nM, with minimal cytotoxicity; exhibits synergistic in vitro antiviral effects in pairwise combinations with tenofovir alafenamide, emtricitabine, or darunavir and maintains potent antiviral activity against HIV-1 variants.HIV Infection Phase 3 Clinical (In Vitro) :Bictegravir (BIC) inhibits the strand transfer activity with an IC50 of 7.5± 0.3 nM. Relative to its inhibition of strand transfer activity, Bictegravir is a much weaker inhibitor of 3′-processing activity of HIV-1 IN, with an IC50 of 241±51 nM. Bictegravir enhances the accumulation of 2-LTR circles ~5-fold relative to the mock-treated control and reduces the amount of authentic integration products in infected cells by 100-fold. Bictegravir potently inhibits HIV-1 replication in both MT-2 and MT-4 cells with EC50s of 1.5 and 2.4 nM, respectively. Bictegravir exhibits potent antiviral effects in both primary CD4+ T lymphocytes and monocyte-derived macrophages, with EC50s of 1.5±0.3 nM and 6.6±4.1 nM, respectively, which are comparable to values obtained in T-cell lines.