L-type amino acid transporter 1 utilizing prodrugs of ferulic acid revealed structural features supporting the design of prodrugs for brain delivery. 2019

Elena Puris, and Mikko Gynther, and Johanna Huttunen, and Seppo Auriola, and Kristiina M Huttunen
School of Pharmacy, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland. Electronic address: elena.puris@uef.fi.

Ferulic acid (FA), a natural antioxidant, has displayed some potential benefits against Alzheimer's disease. However, due to its poor blood-brain barrier (BBB) permeation and low bioavailability, the clinical use of FA for the treatment of Alzheimer's disease has been limited. In the present study, we applied an L-type amino acid transporter (LAT1) - mediated prodrug approach to deliver FA into the mouse brain and synthetized three novel LAT1-utilizing prodrugs of FA. We used a previously proposed methodology for the development of transporter-utilizing prodrugs and investigated their cellular uptake via LAT1 in vitro in ARPE-19 cells, BBB permeation using in situ perfusion in mice and pharmacokinetics after a single i.p. injection in mice; and compared the findings to our previous structure-pharmacokinetics relationship analysis of LAT1-utilizing prodrugs. In addition, we evaluated interspecies differences in the bioconversion rate of the ester-based prodrug in mouse and human plasma and liver S9 subcellular fraction. It was found that amide-based prodrugs with an aromatic ring in the promoiety were effectively bound to LAT1 and utilized the transporter for cellular uptake in vitro and crossed the BBB after in situ perfusion in mice. In addition, the amide prodrug with the promoiety directly conjugated in the meta-position to FA was bioconverted to the parent drug in mouse brain. Importantly, the study showed that the analogous ester-based prodrug did bind to LAT1 but did not utilize the transporter for cellular uptake in ARPE-19 cells. However, the presence of an ester linker between the prodrug and the parent drug promoted favorable bioconversion properties in human in comparison to mouse tissues in vitro i.e. the ester prodrug showed higher stability in human plasma (75% of intact prodrug in 5 h) and liver S9 subcellular fraction (181 min) in comparison to mouse plasma (t½ 2.6 min) and liver S9 fraction (t½ 23.3 min), suggesting that ester-based prodrugs may offer potential benefits in humans. In conclusion, switching from an amide to ester linker between the promoiety and the parent drug can affect the bioconversion rate of prodrugs in different species as well as influencing their cellular uptake mechanism. Furthermore, the results demonstrated the effective application of structure-pharmacokinetic relationships and screening methodology for developing LAT1-utilizing prodrugs and highlighted the importance of evaluating the biotransformation of parent drug and prodrugs in different species.

UI MeSH Term Description Entries
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D008297 Male Males
D011355 Prodrugs A compound that, on administration, must undergo chemical conversion by metabolic processes before becoming the pharmacologically active drug for which it is a prodrug. Drug Precursor,Drug Precursors,Pro-Drug,Prodrug,Pro-Drugs,Precursor, Drug,Precursors, Drug,Pro Drug,Pro Drugs
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D003373 Coumaric Acids Hydroxycinnamic acid and its derivatives. Act as activators of the indoleacetic acid oxidizing system, thereby producing a decrease in the endogenous level of bound indoleacetic acid in plants. Coumaric Acid,Hydroxycinnamic Acid,Hydroxycinnamic Acids,Acid, Coumaric,Acid, Hydroxycinnamic,Acids, Coumaric,Acids, Hydroxycinnamic
D004952 Esters Compounds derived from organic or inorganic acids in which at least one hydroxyl group is replaced by an –O-alkyl or another organic group. They can be represented by the structure formula RCOOR’ and are usually formed by the reaction between an acid and an alcohol with elimination of water. Ester
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001692 Biological Transport The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments. Transport, Biological,Biologic Transport,Transport, Biologic
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus

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