CA125/CD3 Antibodies

Target Information

CA 125 determinant is present on a high molecular weight, mucin like glycoprotein of high molecular weight. CA 125 has been found on frozen sections of amnion and derivatives of coelomic and mullerian epithelium, including pleura, pericardium and peritoneum. In adult tissues, epithelial cells of fallopian tube, endometrium and endocervix; pancreas, colon, gall bladder, stomach, kidney, apocrine sweat gland and mammary gland. It is also found in mesothelial cell lining of pleura, pericardium and peritoneum. It is found in ovarian tumors of serous, endometrioid or clear cell types and adenocarcinomas of mullerian type.

The CD3 complex, composed of gamma, delta, epsilon, and zeta subunits, is essential for the assembly, trafficking, and surface expression of the T cell receptor (TCR) complex. These subunits are structurally related members of the immunoglobulin superfamily and are encoded by closely linked genes on human chromosome 11. CD3 is expressed by thymocytes in a developmentally regulated manner and by all mature T cells, but not on B or NK cells. The CD3 subunits play a crucial role in transducing antigen-recognition signals into the cytoplasm of T cells. The cytoplasmic tails of CD3 subunits contain a double tyrosine-based motif that associates with cytoplasmic signal transduction molecules, mediating T cell activation through the TCR. Crosslinking of the TCR initiates intracellular biochemical pathways that result in cellular activation, proliferation, and potentially growth arrest and cell survival. CD3 is present on 68-82% of normal peripheral blood lymphocytes, 65-85% of thymocytes, and Purkinje cells in the cerebellum. Decreased percentages of T lymphocytes may be observed in some autoimmune diseases. Defects in the CD3 gene are associated with CD3 immunodeficiency, highlighting its importance in immune function and regulation.