ISSN:
1573-4986
Keywords:
carcinoembryonic antigen
;
CD15
;
Lewisx
;
oesophagus
;
squamous mucosa
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Carcinoembryonic antigen (CEA)-related antigens were detected histologically in normal and inflamed oesophageal squamous mucosa using polyclonal anti-CEA antisera and monoclonal antibodies recognizing CEA or NCAs (non-specific cross-reacting antigens). Expression was limited to the surface of more mature squames. Immunoblotting of detergent extracts of oesophageal mucosa separated on polyacrylamide gels using polyclonal anti-CEA antisera showed a number of CEA-related proteins, of 195, 145, and 80 kDa. CEA-specific monoclonal antibodies recognized only the 195-kDa glycoprotein. The lower molecular weight species were recognized by anti-NCA antibody DD9 and a CD66 antibody. The carboyhydrate antigen Lewisx (Lex, CD15), previously shown to be a marker of mature squames, was present predominantly on a subpopulation of the 195-kDa antigen and was demonstrable on the higher molecular weight component of a doublet recognized by the CEA antibodies. Expression of Lex carbohydrate antigens in inflamed oesophageal squamous mucosa was shown to be significantly reduced relative to the expression seen in normal tissue. A suprabasal layer of CEA-positive, Lex-negative cells became apparent in inflamed tissue showing altered glycosylation of the CEA under these conditions. It is postulated that CEA plays a role in maintaining the integrity of the squamous mucosa.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00919336
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