Host plasma and tissue proteins

Host plasma and tissue proteins represent a broad and heterogeneous group of proteins located in the systemic circulation and within various organ tissues. This term does not describe a single therapeutic target but rather a collective physiological environment that dictates the pharmacokinetic profile of most drugs [StatPearls]. Plasma proteins, most notably albumin and alpha-1-acid glycoprotein, act as reservoirs and transporters for exogenous compounds, significantly impacting their volume of distribution and half-life [Merck Manual]. Tissue proteins encompass a wide array of structural, enzymatic, and regulatory molecules that can interact with drugs, sometimes leading to off-target effects or sequestration [ScienceDirect]. In clinical pharmacology, the degree of binding to these proteins is a critical determinant of the "free drug" concentration available to interact with specific therapeutic targets [PubMed]. Understanding these interactions is essential for predicting drug behavior and ensuring safety across diverse patient populations [StatPearls].

Other names

Plasma proteinsSerum proteinsTissue-associated proteinsExtracellular matrix proteinsCirculating proteins

Non-specific binding to plasma and tissue proteins, which modulates the free fraction of drugs and influences their distribution and elimination [Merck Manual][PubMed].