Abstract
Neutrophils participate in host protection and central to this process is the regulation of oxidative mechanisms. We purified by affinity chromatography the receptor for the GlcNAc-specific WGA from CD14+ CD16+ cell lysates (WGAr). The receptor is a 141 kDa glycoprotein constituted by two subunits of 78 and 63 kDa. It is mainly composed of Ser, Asx, and Gly, and, in a minor proportion, His, Cys, and Pro. Its glycan portion contains GlcNAc, Gal, and Man; NeuAc and GalNAc were identified in a minor proportion. The amino acid sequence of the WGA receptor was predicted from tryptic peptides by MALDI-TOF, both subunits showed homology with cytokeratin type II (26 and 29% for the 78 and 63 kDa subunits, respectively); the 78 kDa subunit showed also homology with the human transferrin receptor (24%). Antibodies against WGAr induce higher oxidative burst than WGA, determined by NBT reduction; however, this effect was inhibited (p < 0.05) with GlcNAc suggesting that WGAr participates as mediator in signal transduction in neutrophils.
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Abbreviations
- BSA:
-
bovine serum albumin
- WGA:
-
wheat germ agglutinin
- WGAr:
-
wheat germ agglutinin neutrophils receptor
- PMA:
-
phorbol 12-myristate 13-acetate
- FITC:
-
fluorescein isothiocyanate
- NBT:
-
nitroblue tetrazolium
- GlcNAc:
-
N-acetyl-D-glucosamine
- GalNAc:
-
N-acetyl-D-galactosamine
- Gal:
-
galactose
- Man:
-
Mannose
- Fuc:
-
Fucose
- NeuAc:
-
sialic acid; N-acetyl-neuraminic acid
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Solórzano, C., Bouquelet, S., Pereyra, M.A. et al. Isolation and characterization of the potential receptor for wheat germ agglutinin from human neutrophils. Glycoconj J 23, 591–598 (2006). https://doi.org/10.1007/s10719-006-8635-6
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DOI: https://doi.org/10.1007/s10719-006-8635-6