Human serum and tissue proteins

Human serum and tissue proteins refer to the comprehensive set of proteins found in the blood and various anatomical tissues, serving as the fundamental building blocks and functional regulators of human physiology. This category is not a single therapeutic target but rather a complex proteome that includes high-abundance transport proteins like albumin, immune components like globulins, and a myriad of tissue-specific enzymes and structural proteins (Anderson & Anderson, 2002, Molecular & Cellular Proteomics). In pharmacology, these proteins are critical because they govern the pharmacokinetic behavior of nearly all drugs; the extent of drug-protein binding determines the "free fraction" of a drug, which is the only portion capable of crossing membranes and interacting with specific molecular targets (Smith et al., 2010, Nature Reviews Drug Discovery). Furthermore, the interaction between drugs and these proteins can be a source of significant drug-drug interactions, as molecules compete for the same binding sites on proteins like albumin (StatPearls, 2023, Plasma Protein Binding). Consequently, variations in the concentration or binding affinity of these proteins—often caused by disease states like cirrhosis or nephrotic syndrome—can lead to significant changes in drug efficacy and safety (Geyer et al., 2017, Cell Systems). Monitoring these proteins also provides vital diagnostic information, as they serve as systemic biomarkers for inflammation, organ function, and metabolic health (NIH, 2023, Clinical Methods).

Other names

Serum proteinsTissue proteinsPlasma proteinsHuman proteomeCirculating proteins

Drugs interact with these proteins through non-specific, reversible binding (primarily to albumin and alpha-1-acid glycoprotein), which regulates the free concentration of the drug in systemic circulation and its subsequent distribution to target tissues (Smith et al., 2010, Nature Reviews Drug Discovery).