CD1D is the humangene that encodes the proteinCD1d,[5] a member of the CD1 (cluster of differentiation 1) family of glycoproteins expressed on the surface of various human antigen-presenting cells. They are non-classical MHC proteins, related to the class I MHC proteins, and are involved in the presentation of lipid antigens to T cells. CD1d is the only member of the group 2 CD1 molecules.
α-galactosylceramide (α-GalCer), a compound originally derived from the marine sponge Agelas mauritanius[6] with no physiological role but great research utility.
iGb3, a self antigen which has been implied in iNKT selection.[8]
HS44, a synthetic amino cyclitolic ceramide analogue which has less contact with the TCR, activating iNKTs in a more constrained way than α-GalCer (specially in relation to Th2 cytokines production) and thus being more interesting for therapeutic use.[9]
CD1d tetramers
CD1d tetramers are protein constructs composed of four CD1d molecules joined together and usually fluorescently labelled, used to identify NKT cells or other CD1d-reactive cells. In particular, type I NKT cells and some type II NKT cells are stained by them. A differentiation of these two types can be obtained in human by using an antibody against the TCR Vα24 chain, which is specific of type I NKT cells.[10]
Although they are the most widely used of CD1d oligomers, sometimes CD1d dimers (two units) or pentamers (five units) are used instead.[10]
Melián A, Beckman EM, Porcelli SA, Brenner MB (1996). "Antigen presentation by CD1 and MHC-encoded class I-like molecules". Curr. Opin. Immunol. 8 (1): 82–88. doi:10.1016/S0952-7915(96)80109-9. PMID8729450.
Joyce S (2001). "CD1d and natural T cells: how their properties jump-start the immune system". Cell. Mol. Life Sci. 58 (3): 442–469. doi:10.1007/PL00000869. PMID11315191. S2CID29982004.
Blumberg RS, Terhorst C, Bleicher P, et al. (1991). "Expression of a nonpolymorphic MHC class I-like molecule, CD1D, by human intestinal epithelial cells". J. Immunol. 147 (8): 2518–2524. doi:10.4049/jimmunol.147.8.2518. PMID1717564. S2CID33639980.
Maruyama K, Sugano S (1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–174. doi:10.1016/0378-1119(94)90802-8. PMID8125298.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, et al. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–156. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.