Dimeric Le(a) (Le(a)-on-Le(a)) status of beta-haptoglobin in sera of colon cancer, chronic inflammatory disease and normal subjects

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The glycosyl epitope dimeric Le(a) (Le(a)-on-Le(a)). defined by mouse monoclonal antibody NCC-ST-421. was identified previously as tumor-associated antigen. expressed highly in various human cancer tissues and cell lines derived therefrom. but with minimal expression in various normal tissues. In the present study, we observed clearly higher expression of this epitope. defined by ST421. in beta-haptoglobin (beta-Hap) from sera of patients with colorectal cancer, compared to normal. healthy subjects or patients with chronic inflammatory processes (Crohn's disease, ulcerative colitis) We focused, therefore, on biochemical characterization of glycosyl epitope status expressed in beta-Hap We concluded that the dimeric Le(a) epitope is carried by O-linked but not by N-linked structure, based on the following observations i) Treatment of beta-Hap with alpha-L-fucosidase reduced its reactivity with ST421. but did not affect its reactivity with anti-Hap antibody In contrast, treatment of purified beta-Hap with PNGase F. which releases N-linked glycans, had no effect on reactivity with ST421 but changed molecular mass from 40 kDa to 30 kDa ii) Strong reactivity of Colo205 supernatant with ST421 was reduced clearly by pre-incubation of cells with benzyl-alpha-GalNAc
Publisher
SPANDIDOS PUBL LTD
Issue Date
2010-05
Language
English
Article Type
Article
Keywords

IMMUNOLOGICAL ADJUVANT QS-21; CARBOHYDRATE VACCINES; GLYCOSYLATION STATUS; PANCREATIC-CANCER; N-GLYCOSYLATION; ANTIGEN; TUMOR; CONJUGATE; BREAST; CELLS

Citation

INTERNATIONAL JOURNAL OF ONCOLOGY, v.36, no.5, pp.1291 - 1297

ISSN
1019-6439
DOI
10.3892/ijo_00000614
URI
http://hdl.handle.net/10203/100629
Appears in Collection
BS-Journal Papers(저널논문)
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