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Interaction of antiretrovirals with drug transporters such as P-glycoprotein (P-gp), multidrug resistance-associated protein (MRP), breast cancer resistance protein (BCRP) and solute carrier organic anion transporter (SLCO) may influence the emergence of viral mutants by altering intracellular drug concentrations. Here we characterize the effect of transporter expression in a variety of cell types such as control CEM, CEM(VBL) (P-gp-overexpressing), CEM(E1000) (MRP1-overexpressing), MT4, control MDCKII, MDCKII(MDR1) (P-gp-overexpressing) and peripheral blood mononuclear cells (PBMCs) on the uptake of [(14)C]efavirenz and [(3)H]nevirapine. We also investigated the lipophilicity of [(14)C]efavirenz and [(3)H]nevirapine.

Intracellular accumulation of efavirenz and nevirapine is independent of P-glycoprotein activity in cultured CD4 T cells and primary human lymphocytes