Tacrine Sinusoidal Uptake and Biliary Excretion in Sandwich-Cultured Primary Rat Hepatocytes

Authors

  • Amal Kaddoumi Department of Basic Pharmaceutical Science, School of Pharmacy, University of Louisiana at Monroe. 1800 Bienville Dr., Monroe, LA.
  • Loqman A. Mohamed Department of Basic Pharmaceutical Science, School of Pharmacy, University of Louisiana at Monroe. 1800 Bienville Dr., Monroe, LA.

DOI:

https://doi.org/10.18433/J3801T

Abstract

PURPOSE. The knowledge of hepatic disposition kinetics of tacrine, a first cholinesterase inhibitor was approved by FDA for the treatment of Alzheimer’s disease (AD), would help to understand its hepatotoxicity, its therapeutic effect, and improve the management of patients with AD. The current study aims to characterize tacrine hepatic transport kinetics and study the role of organic cation transporters (OCTs), P-glycoprotein (P-gp) and multidrug resistance-associated protein (MRP2) in tacrine sinusoidal uptake and biliary excretion. METHODS. Modulation of tacrine hepatic uptake and efflux, biliary excretion index (BEI%), were performed in sandwich-cultured primary rat hepatocytes (SCHs) using transporters inhibitors. Conformation of the integrity of SCHs model was established by capturing images with light-contrast and fluorescence microscopy. RESULTS. Tacrine uptake in SCHs was carrier-mediated process and saturable with apparent Km of 31.5±9.6 µM and Vmax of 908±72 pmol/min/mg protein. Tetraethyl ammonium (TEA), cimetidine and verapamil significantly reduced tacrine uptake with more pronounced effect observed with verapamil which caused 3-fold reduction in tacrine uptake, indicating role for OCTs. Tacrine has a biliary excretion in SCHs with maximum BEI% value of 22.9±1.9% at 10 min of incubation. Addition of MK571 and valspodar decreased the BEI% of tacrine by 40 and 60% suggesting roles for canalicular MRP2 and P-gp, respectively. CONCLUSIONS. Our results show that in addition to metabolism, tacrine hepatic disposition is carrier-mediated process mediated by sinusoidal OCTs, and canalicular MRP2 and P-gp.

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Author Biography

Amal Kaddoumi, Department of Basic Pharmaceutical Science, School of Pharmacy, University of Louisiana at Monroe. 1800 Bienville Dr., Monroe, LA.

Department of Basic Pharmaceutical Sciences

Associate professor of Pharmaceutics.

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Published

2014-09-03

How to Cite

Kaddoumi, A., & Mohamed, L. A. (2014). Tacrine Sinusoidal Uptake and Biliary Excretion in Sandwich-Cultured Primary Rat Hepatocytes. Journal of Pharmacy & Pharmaceutical Sciences, 17(3), 427–438. https://doi.org/10.18433/J3801T

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Section

Pharmaceutical Sciences; Review Articles