Membrane transporters have a crucial role in compounds' brain drug delivery. They allow not only the penetration of a wide variety of different compounds to cross the endothelial cells of the blood-brain barrier (BBB), but also the accumulation of them into the brain parenchymal cells. Solute carriers (SLCs), with nearly 500 family members, are the largest group of membrane transporters. Unfortunately, not all SLCs are fully characterized and used in rational drug design. However, if the structural features for transporter interactions (binding and translocation) are known, a prodrug approach can be utilized to temporarily change the pharmacokinetics and brain delivery properties of almost any compound. In this review, main transporter subtypes that are participating in brain drug disposition or have been used to improve brain drug delivery across the BBB via the prodrug approach, are introduced. Moreover, the ability of selected transporters to be utilized in intrabrain drug delivery is discussed. Thus, this comprehensive review will give insights into the methods, such as computational drug design, that should be utilized more effectively to understand the detailed transport mechanisms. Moreover, factors, such as transporter expression modulation pathways in diseases that should be taken into account in rational (pro)drug development, are considered to achieve successful clinical applications in the future.

Department of Pharmaceutical Chemistry Drug Analysis and Radiopharmacy Medical University of Lodz ul Muszyńskiego 1 90 151 Lodz Poland

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo Namesti 542 2 160 00 Prague Czech Republic

School of Pharmacy Faculty of Health Sciences University of Eastern Finland P O Box 1627 FI 70211 Kuopio Finland

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