The AAPS Journal

, 20:21 | Cite as

The Drug of Abuse Gamma-Hydroxybutyric Acid Exhibits Tissue-Specific Nonlinear Distribution

  • Melanie A. Felmlee
  • Bridget L. Morse
  • Kristin E. Follman
  • Marilyn E. Morris
Research Article
  • 131 Downloads

ABSTRACT

The drug of abuse γ-hydroxybutyric acid (GHB) demonstrates complex toxicokinetics with dose-dependent metabolic and renal clearance. GHB is a substrate of monocarboxylate transporters (MCTs) which are responsible for the saturable renal reabsorption of GHB. MCT expression is observed in many tissues and therefore may impact the tissue distribution of GHB. The objective of the present study was to evaluate the tissue distribution kinetics of GHB at supratherapeutic doses. GHB (400, 600, and 800 mg/kg iv) or GHB 600 mg/kg plus l-lactate (330 mg/kg iv bolus followed by 121 mg/kg/h infusion) was administered to rats and blood and tissues were collected for up to 330 min post-dose. Kp values for GHB varied in both a tissue- and dose-dependent manner and were less than 0.5 (except in the kidney). Nonlinear partitioning was observed in the liver (0.06 at 400 mg/kg to 0.30 at 800 mg/kg), kidney (0.62 at 400 mg/kg to 0.98 at 800 mg/kg), and heart (0.15 at 400 mg/kg to 0.29 at 800 mg/kg), with Kp values increasing with dose consistent with saturation of transporter-mediated efflux. In contrast, lung partitioning decreased in a dose-dependent manner (0.43 at 400 mg/kg to 0.25 at 800 mg/kg) suggesting saturation of active uptake. l-lactate administration decreased Kp values in liver, striatum, and hippocampus and increased Kp values in lung and spleen. GHB demonstrates tissue-specific nonlinear distribution consistent with the involvement of monocarboxylate transporters. These observed complexities are likely due to the involvement of MCT1 and 4 with different affinities and directionality for GHB transport.

KEY WORDS

Gamma-hydroxybutyric acid Monocarboxylate transporters Toxicokinetics 

Notes

ACKNOWLEDGEMENTS

The study received grant support from the NIH (R01 DA023223).

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Copyright information

© American Association of Pharmaceutical Scientists 2017

Authors and Affiliations

  • Melanie A. Felmlee
    • 1
    • 2
  • Bridget L. Morse
    • 1
    • 3
  • Kristin E. Follman
    • 1
  • Marilyn E. Morris
    • 1
  1. 1.Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical SciencesUniversity at Buffalo, State University of New YorkBuffaloUSA
  2. 2.Department of Pharmaceutics & Medicinal Chemistry, Thomas J Long School of Pharmacy & Health SciencesUniversity of the PacificStocktonUSA
  3. 3.Investigative Drug DispositionEli Lilly and CompanyIndianapolisUSA

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