Detection of CD1b in MOLT‑4 Human Cell Line by Flow Cytometry. MOLT‑4 human acute lymphoblastic leukemia cell line was stained with Mouse Anti-Human CD1b Alexa Fluor® 488‑conjugated Monoclonal Antibody (Catalog # FAB7446G, filled histogram) or isotype control antibody (Catalog # IC0041G, open histogram). View our protocol for Staining Membrane-associated Proteins.
Preparation and Storage
The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Protect from light. Do not freeze.
12 months from date of receipt, 2 to 8 °C as supplied.
CD1b is a 44-46 kDa member of the CD1 family of proteins. It is one of five CD1 isoforms (CD1a-e) that resemble MHC-I type molecules. Based on structure, CD1a, 1b and 1c can be grouped together, with CD1d and 1e existing as stand-alone forms. CD1b is a 316 amino acid (aa) type I transmembrane glycoprotein that contains one Ig-like domain in its ECD. It is expressed in the late endosome/lysosome compartment of myeloid-type dendritic cells. Following synthesis, CD1b associates with SAP-C, binds two short lipids in an unusually large ligand-binding groove, and transits either to the plasma membrane, or more commonly, the endosomal compartment. In either case, exposure to Gm- lipid A or mycobacterial glyolipid results in a substitution of the foreign lipid for the two short-chain self lipids, followed by its presentation on the plasma membrane. Select alpha beta and gamma δ T cell recognize these lipids and typically repond with Th1-type cytokines (IFN-gamma and TNF-alpha ). Unlike other CD1 family molecules, CD1b does not seem to have a soluble form. There is no rodent counterpart to human CD1b, only to CD1d.
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