Transport of hydroxyzine and triprolidine across bovine olfactory mucosa: Role of passive diffusion in the direct nose-to-brain uptake of small molecules

Karunya K. Kandimalla, Maureen D. Donovan

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Hydroxyzine and triprolidine have both been reported to reach the CNS following nasal administration. The objective of this study was to investigate their in vitro permeation across bovine olfactory mucosa in order to further characterize the biological and physicochemical parameters that influence direct nose-to-brain transport. In vitro experiments were conducted using Sweetana-Grass (Navicyte®) vertical diffusion cells to evaluate the effect of directionality, donor concentration and pH on the permeation of hydroxyzine and triprolidine across excised bovine olfactory mucosa. These studies demonstrated that the Jm-s (mucosal-submucosal flux) and J s-m (submucosal-mucosal flux) of hydroxyzine and triprolidine across the olfactory mucosa were linearly dependent upon the donor concentration without any evidence of saturable transport. Hydroxyzine inhibited the efflux of P-gp substrates like etoposide and chlorpheniramine across the olfactory mucosa. Both hydroxyzine and triprolidine reduced the net flux (Js-m - Jm-s) of etoposide with IC50 values of 39.2 and 130.6 μM, respectively. The lipophilicty of these compounds, coupled with their ability to inhibit P-gp, enable them to freely permeate across the olfactory mucosa. Despite the presence of a number of protective barriers such as efflux transporters and metabolizing enzymes in the olfactory system, lipophilic compounds such as hydroxyzine and triprolidine can access the CNS primarily by passive diffusion when administered via the nasal cavity.

Original languageEnglish (US)
Pages (from-to)133-144
Number of pages12
JournalInternational journal of pharmaceutics
Volume302
Issue number1-2
DOIs
StatePublished - Sep 30 2005
Externally publishedYes

Keywords

  • CNS
  • Diffusion
  • Efflux
  • Etoposide
  • Hydroxyzine
  • Membrane transport proteins
  • Nasal absorption
  • Olfactory mucosa
  • P-glycoprotein
  • Triprolidine

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