Isoform 10 (epithelial isoform) is expressed by cells of epithelium and highly expressed by carcinomas. Expression is repressed in neuroblastoma cells.
Expressed in the developing retina between 16 and 19 weeks post-conception, specifically in the outer neuroblastic zone, inner neuroblastic zone, interphotoreceptor zone and the retinal pigment epithelium (at protein level).
Proteolytically cleaved in the extracellular matrix by specific proteinases (possibly MMPs) in several cell lines and tumors.; N-glycosylated.; O-glycosylated. O-glycosylation contains more-or-less-sulfated chondroitin sulfate glycans, whose number may affect the accessibility of specific proteinases to their cleavage site(s). It is uncertain if O-glycosylation occurs on Thr-637 or Thr-638.; Phosphorylated; activation of PKC results in the dephosphorylation of Ser-706 (constitutive phosphorylation site), and the phosphorylation of Ser-672.
CD44 is a cell-surface glycoprotein postulated to play a role in a variety of biological processes, including lymphocyte homing and tumor-cell metastasis. It mediates cell-cell and cell-matrix interactions through its affinity for hyaluronic acid (HA), and possibly also through its affinity for other ligands such as osteopontin, collagens, and matrix metalloproteinases (MMPs). Adhesion with HA plays an important role in cell migration, tumor growth and progression. CD44 is highly polymorphic, possesses a number of alternative splice variants and undergoes extensive post-translational modifications.
Just like the interactions between antigens and antibodies, the higher the affinity between you and us the better.