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• W2973709516 abstract "Eflornithine has been used to treat second-stage human African trypanosomiasis. However, it has inadequate oral bioavailability and low blood-brain barrier permeation, thus requiring a lengthy and complicated intravenous infusion schedule. Here, we investigated the feasibility of using an intercellular junction-modulating E-cadherin peptide HAV6 to enhance the oral bioavailability and blood-brain barrier permeation of eflornithine. Eflornithine was not metabolized in liver microsomes, nor was it a substrate for the human efflux transporter P-glycoprotein. Furthermore, HAV6 and HAV6scr (sequence scrambled HAV6) were stable in simulated gastric fluid with pepsin and rat intestinal mucosal scrapings. Both peptides were stable in human plasma, albeit less stable in rat and mouse plasma. HAV6 increased eflornithine permeability across Madin-Darby canine kidney and Caco-2 cell monolayers (5- and up to 8.5-fold), whereas HAV6scr had little effect. Using an in situ rat brain perfusion model, HAV6, but not HAV6scr, significantly increased eflornithine concentrations in different brain regions up to 4.9-fold. In rats, coadministration of HAV6 increased eflornithine oral bioavailability from 38% to 54%, brain concentrations by up to 83%, and cerebrospinal fluid concentrations by 40%. In conclusion, coadministration of HAV6, either during intravenous infusion or as an oral formulation, has the potential to improve eflornithine-based treatment for second-stage human African trypanosomiasis." @default.
• W2973709516 created "2019-09-26" @default.
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• W2973709516 date "2019-12-01" @default.
• W2973709516 modified "2023-09-27" @default.
• W2973709516 title "Improving Eflornithine Oral Bioavailability and Brain Uptake by Modulating Intercellular Junctions With an E-cadherin Peptide" @default.
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• W2973709516 doi "https://doi.org/10.1016/j.xphs.2019.09.015" @default.
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