General plasma ligands and transport processes

General plasma ligands and transport processes refers to a functional grouping of proteins in the blood plasma that facilitate the transport of various molecules, including hormones, lipids, vitamins, and drugs (IUPHAR: https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=1001). Key members of this group include Serum albumin, Alpha-1-acid glycoprotein (AAG), and various globulins like Transthyretin and Sex hormone-binding globulin (StatPearls: https://www.ncbi.nlm.nih.gov/books/NBK542187/). These proteins play a fundamental role in determining the pharmacokinetic profile of therapeutic agents by influencing their distribution and the fraction of drug available to interact with specific tissue targets (PubMed: https://pubmed.ncbi.nlm.nih.gov/33428965/). While not typically therapeutic targets themselves, their saturation or displacement can lead to significant clinical consequences and drug-drug interactions (NCBI: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4743551/). Understanding these processes is essential for predicting drug behavior in different patient populations, particularly those with altered protein levels due to disease. The binding capacity and affinity of these proteins are major determinants of a drug's volume of distribution and systemic clearance.

Other names

Plasma transport proteinsBlood transport processesPlasma protein binding proteinsPlasma ligands

Drugs interact with these plasma proteins through reversible, non-covalent binding at specific sites, such as Sudlow's site I and II on albumin, which regulates the free drug concentration available for tissue distribution and receptor interaction (StatPearls: https://www.ncbi.nlm.nih.gov/books/NBK542187/).