What is CD63 a marker for?
CD63 was first detected as a marker of platelet activation, which is increased on the surface of platelets after granule release (Chapter 18).
What cells express CD63?
CD63 is a member of the tetraspanin superfamily of activation-linked cell surface antigens that is known for its abnormally high levels on the surface of activated basophils (334), on proliferating mast cells (335,336), and on the surface of endothelial cells in inflamed tissue (336).
Why does CD63 appear on the surface of basophils?
CD63 is anchored in the basophilic granule membrane (which contains histamine) and its exposure to the outside of the cells reflects cell degranulation due to fusion between granules and plasma membranes (figure 1). Thus, CD63 expression has been proposed as a reliable means to monitor basophil activation [11–13].
What is CD203c?
CD203c (ectonucleotide pyrophosphatase [E-NPP3]) is a surface marker observed uniquely on basophils and mast cells that is upregulated by anti-IgE antibody and allergens (18).
What is CD63 antibody?
CD63 (LAMP-3, lysosome-associated membrane protein-3), a glycoprotein of tetraspanin family, is present in late endosomes, lysosomes and secretory vesicles of various cell types. CD63 is also present in the plasma membrane, usually following cell activation.
What is CD63 gene?
CD63 Gene – CD63 Molecule The protein encoded by this gene is a member of the transmembrane 4 superfamily, also known as the tetraspanin family. Most of these members are cell-surface proteins that are characterized by the presence of four hydrophobic domains.
How are eosinophils activated?
Eosinophils can be activated by cross-linking of IgG or IgA Fc receptors by agarose beads with IgG, IgA, or secretory IgA, with the latter being most potent. Eosinophils can be primed for activation by a number of mediators, including IL-3, IL-5, GM-CSF, CC chemokines, and platelet-activating factor.
Where is CD81 found?
This gene is localized in the tumor-suppressor gene region and thus it is a candidate gene for malignancies. The tetraspanin family includes CD9, CD37, CD53, CD63, CD81 (this protein), CD82 and CD151. CD81 interacts directly with immunoglobulin superfamily member 8 (IGSF8, CD316) and CD36.
What is CD81 ligand?
CD81 belongs to the tetraspanin superfamily, whose members form specialized assemblies on the plasma membrane referred to as tetraspanin-enriched microdomains (TERMs). The specific ligand interactions within TERMs define cellular functions of tetraspanins (22).
What does CD63 stand for in biology?
CD63 (Cell Surface Antigen) CD63 is a member of the tetraspanin superfamily of activation-linked cell surface antigens that is known for its abnormally high levels on the surface of activated basophils (334), on proliferating mast cells (335, 336), and on the surface of endothelial cells in inflamed tissue (336).
What is CD63 and CD9 expression in pancreatic ductal adenocarcinoma?
Exosomal markers (CD63 and CD9) expression and their prognostic significance using immunohistochemistry in patients with pancreatic ductal adenocarcinoma CD63 and CD9 expression is higher in primary tumor from the pancreas compared to pancreatic tumor from metastatic sites.
Where is CD63 expressed during ovulation in rats?
Before the induction of ovulation in immature rats, CD63 is expressed constitutively in follicular thecal cells and stromal interstitial cells, whereas expression in the granulosa layer must be induced by an ovulatory dose of hCG ( 45 ).
What is the function of CD63 in HBV?
Overall, CD63 promotes the efficient production and release of infectious HBV particles, and its suppression induces secretion of subviral particles and viral particles that are less infective. CD63 belongs to the tetraspanin family and is mostly present in MVBs, including ILVs, lysosomes, and exosomes.