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A monoclonal antibody, PGM34, against 6‐sulfated blood‐group H type 2 antigen, on the carbohydrate moiety of mucin
Author(s) -
Tsubokawa Daigo,
Goso Yukinobu,
Sawaguchi Akira,
Kurihara Makoto,
Ichikawa Takafumi,
Sato Noriko,
Suganuma Tatsuo,
Hotta Kyoko,
Ishihara Kazuhiko
Publication year - 2007
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/j.1742-4658.2007.05731.x
Subject(s) - monoclonal antibody , mucin , antigen , blood type (non human) , antibody , immunology , carbohydrate , medicine , glycoprotein , virology , chemistry , abo blood group system , biochemistry , pathology
Mucin, a major component of mucus, is a highly O‐glycosylated, high‐molecular‐mass glycoprotein extensively involved in the physiology of gastrointestinal mucosa. To detect and characterize mucins derived from site‐specific mucous cells, we developed a monoclonal antibody, designated PGM34, by immunizing a mouse with purified pig gastric mucin. The reactivity of PGM34 with mucin was inhibited by periodate treatment of the mucin, but not by trypsin digestion. This suggests that PGM34 recognizes the carbohydrate portion of mucin. To determine the epitope, oligosaccharide‐alditols obtained from pig gastric mucin were fractionated by successive gel‐filtration, ion‐exchange, and normal‐phase HPLC, and tested for reactivity with PGM34. Two purified oligosaccharide‐alditols that reacted with PGM34 were obtained. Their structures were determined by NMR spectroscopy as Fucα1–2Galβ1–4GlcNAc(6SO 3 H)β1–6(Fucα1–2Galβ1–3)GalNAc‐ol and Fucα1–2Galβ1–4GlcNAc(6SO 3 H)β1–6(Galβ1–3)GalNAc‐ol. None of the defucosylated or desulfated forms of these oligosaccharides reacted with PGM34. Thus, the epitope of PGM34 was determined as the Fucα1–2Galβ1–4GlcNAc(6SO 3 H)β‐ sequence. Immunohistochemical examination of rat gastrointestinal tract showed that PGM34 stained surface mucous cells close to the generative cell zone in the gastric fundus and goblet cells in the small intestine, but only slightly stained antral mucous cells in the stomach. These data, taken together, show that PGM34 is a very useful tool for elucidating the role of mucins with characteristic sulfated oligosaccharides.