Colon epithelial cell surface proteins

Colon epithelial cell surface proteins refer to a broad and heterogeneous category of proteins localized to the plasma membrane of the cells lining the colon. This group includes essential physiological regulators such as Guanylate cyclase C (GUCY2C), which maintains fluid and electrolyte homeostasis and is the primary target for drugs like linaclotide used in treating irritable bowel syndrome and chronic constipation [1]. It also encompasses highly specific markers like Glycoprotein A33 (GPA33) and Cadherin-17 (CDH17), which are being investigated as targets for radioimmunotherapy and bispecific antibodies due to their restricted expression in intestinal tissues [2][5]. Additionally, this category includes well-known tumor-associated antigens such as Carcinoembryonic Antigen (CEA/CEACAM5) and Epithelial Cell Adhesion Molecule (EpCAM), which serve as critical biomarkers and therapeutic targets for monoclonal antibodies and antibody-drug conjugates in colorectal cancer [3][4]. Because this term describes a functional and anatomical class rather than a single molecular entity, it is considered a descriptive grouping rather than a specific therapeutic target. Therapeutic strategies involving these proteins vary widely, ranging from receptor agonism to targeted immunotherapy, depending on the specific protein's role in health and disease.

Other names

Colonic epithelial surface antigensIntestinal epithelial cell surface proteinsColon-specific surface markersIntestinal mucosal antigens

Agonism of transmembrane receptors (e.g., Guanylate cyclase C) to regulate fluid secretion; antibody-mediated targeting of tumor-associated antigens (e.g., CEA, EpCAM) for immune-mediated cell lysis or cytotoxic delivery; inhibition of growth factor receptors (e.g., EGFR) to arrest tumor growth.