Cell surface receptors and antigens

Cell surface receptors and antigens represent a broad and diverse class of proteins located on the plasma membrane of cells that mediate communication between the cell and its external environment (Wikipedia, 2023). These molecules are critical for facilitating signal transduction, cell adhesion, and immune recognition, often serving as the primary interface for extracellular ligands such as hormones, neurotransmitters, and cytokines (National Institutes of Health, 2024). While many individual members of this group, such as G protein-coupled receptors (GPCRs) or Cluster of Differentiation (CD) antigens, are highly successful therapeutic targets, the term itself refers to a functional category rather than a specific molecular entity (NCBI MeSH, 2024). In oncology and immunology, specific surface proteins are targeted by monoclonal antibodies, CAR-T cells, and small molecule inhibitors to modulate cellular behavior or induce targeted cell death (PubMed, 2023). Because this classification encompasses thousands of distinct proteins with varied biological roles, it is considered too broad for specific pharmacological characterization or drug-target profiling. Effective drug development requires identifying a specific member within this category to ensure therapeutic precision and minimize safety concerns associated with broad-spectrum modulation (UniProt, 2024).

Other names

Cell surface markersMembrane-bound receptorsSurface antigensCD markersPlasma membrane proteins

Not applicable as a single target; mechanisms of action vary widely depending on the specific receptor or antigen targeted.