Mariana Babayeva

Mariana Babayeva

Touro College of Pharmacy, USA

Title: Renal excretion of Apricitabine: Ex vivo and In vivo studies


Mariana Babayeva is an Associate Professor at Touro College of Pharmacy, New York City. In addition to her role at Touro, she is also a Visiting Scientist at Arnold and Marie Schwartz School of Pharmacy of LIU, an Adjunct Professor at Rockefeller University, and Instructor at UNC, Eshelman School of Pharmacy. She has over 10 years of experience inclinical practice. She is recognized for her expertise in the pharmacokinetics of renal excretion and the use of animal and organ models to explore mechanism and kinetics of renal clearance. She has conducted several international research projects. She has published in peer-reviewed journals focusing on pharmocokinetics of interaction.


Apricitabine (ATC) is a novel nucleoside reverse transcriptase inhibitor undergoing phase 2/3 clinical development for the treatment of HIV infection. In this investigation, the renal handling of ATC was evaluated in isolated perfused rat kidney (IPK) model with follow-up in vivo studies. IPK experiments were performed to characterize the renal excretion of ATC, toprobe mechanisms of ATC excretion using known inhibitors of organic cation (cimetidine) and organic anion (probenecid)transport systems, and to screen for potential drug-drug interactions between ATC and clinically relevant medications (dapsone, metformin, pentamidine, stavudine, tenofovir and ritonavir). ATC demonstrated net tubular secretion in the IPKwith average excretion ratio (XR) of 2.1. ATC XR decreased 3.6-fold in the presence of cimetidine and 2-fold in the presence of probenecid. Among the clinically relevant medications, metformin produced the greatest inhibitory effect on ATC excretion. In vivo studies were conducted in rats to evaluate ATC disposition upon co-administration with compoundsthat showed a significant effect on ATC clearance in the IPK model. Co-administration of cimetidine and trimethoprim significantly reduced ATC renal clearance, but resulted in only a moderate increase in plasma exposure. Metformin had no apparent effect on ATC clearance. These findings indicate that the IPK model is more sensitive to secretory inhibition as compared to in vivo. The medications screened showed minimal effects on ATC renal excretion in the IPK, and should thus be excluded as potential In vivo interactants. Overall, this study generated important information on renal handling of ATC to support its development and commercialization.

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