Carrier-mediated drug delivery (CMDD)

Carrier-mediated drug delivery (CMDD) is a pharmacological strategy that utilizes endogenous transport proteins to facilitate the movement of therapeutic agents across biological membranes. This mechanism typically involves the chemical conjugation of a drug (the cargo) to a ligand that mimics a natural substrate, such as an amino acid, hexose, or vitamin, which is then recognized by specific transporters like the Solute Carrier (SLC) family [1]. CMDD is particularly vital for overcoming restrictive barriers such as the blood-brain barrier (BBB) and the intestinal mucosa, where passive diffusion is often insufficient for polar or large molecules [2]. By hijacking these high-affinity transport systems, drugs like Levodopa or Gabapentin achieve effective therapeutic concentrations in the central nervous system [3]. This approach not only enhances bioavailability but also allows for tissue-specific targeting based on the differential expression of transporters in various organs or tumors [4]. However, the strategy faces challenges such as competition with endogenous nutrients and the potential for transporter saturation, which can limit the rate of drug uptake [5]. [1] Hediger, M. A., et al. (2013). "The ABCs of membrane transporters in health and disease (SLC series)." Molecular Aspects of Medicine. [2] Pardridge, W. M. (2012). "Drug transport across the blood-brain barrier." Journal of Cerebral Blood Flow & Metabolism. [3] Scalise, M., et al. (2018). "The SLC7 Family of Amino Acid Transporters and Cancer." Frontiers in Oncology. [4] Manners, S., et al. (2020). "Transporter-Mediated Drug Delivery." Pharmaceutics. [5] Zhang, Y., et al. (2019). "Transporters in Drug Discovery and Development." Molecular Pharmaceutics.

Other names

Carrier-mediated transportTransporter-mediated drug deliveryLigand-targeted deliveryProdrug-mediated transportCMT

The mechanism involves the chemical linkage of a therapeutic molecule to a specific ligand that acts as a substrate for endogenous membrane transporters or receptors, facilitating active or facilitated transport across biological barriers such as the blood-brain barrier or intestinal epithelium [2, 4].