Cellular and Serum Proteins

Cellular and Serum Proteins is a broad classification encompassing all proteins found within cells and the systemic circulation. Serum proteins, such as albumin and alpha-1-acid glycoprotein, are vital for maintaining the osmotic pressure of blood and serving as transport vehicles for hormones, fatty acids, and drugs (StatPearls: Albumin, 2023). Cellular proteins include a vast array of enzymes, structural components, and signaling molecules that drive metabolic processes and maintain homeostatic functions (UniProt, 2024). In the context of drug development, these proteins are rarely the primary therapeutic target but are crucial for understanding pharmacokinetics, as drug-protein binding determines the free concentration of a drug in the plasma (PubMed: PMID 11516307). Alterations in the levels of these proteins, such as hypoalbuminemia, can significantly impact drug efficacy and safety, leading to potential toxicity or subtherapeutic dosing (NIH: Liver Function Tests, 2022). Because this term refers to a collective group rather than a specific protein or receptor, it is generally classified as a generic or non-specific entry in target databases.

Other names

Plasma proteinsBlood proteinsIntracellular proteinsSerum albuminGlobulinsTotal serum protein

Non-specific binding to serum proteins, such as albumin and alpha-1-acid glycoprotein, which sequesters drugs and regulates their free plasma concentration, distribution, and half-life (PubMed: PMID 11516307).