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. 1991 Mar;63(3):390–398. doi: 10.1038/bjc.1991.91

Purification and characterisation of a breast-cancer-associated glycoprotein not expressed in normal breast and identified by monoclonal antibody 83D4.

G Pancino 1, E Osinaga 1, C Charpin 1, D Mistro 1, J P Barque 1, A Roseto 1
PMCID: PMC1971846  PMID: 1706194

Abstract

Monoclonal antibody (mAb) 83D4 was generated using formol-fixed paraffin-embedded human breast carcinoma tissue as the immunogen. Previous studies demonstrated that it was reactive with breast carcinoma tissues, but not with normal breast. The antigen identified by mAb 83D4 was detected, using ELISA, in MCF7 breast carcinoma cell line membrane extracts, in primary breast and colon carcinoma tissue extracts and in pleural effusion fluid from patients with metastatic breast cancer. No reactivity with 83D4 was found in either human milk fat globule membranes or skimmed milk. 83D4 reactive antigen was found to be a heterogeneous high molecular weight (MW) protein (apparent Mr:300-400 to over 1000 kDa) by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting. The antigen was purified from MCF7 cells, breast and colon carcinomas and effusion fluid, by perchloric acid solubilisation followed by immunoaffinity chromatography with 83D4. The immunopurified antigen from MCF7 cells and pleural effusion fluid was further analysed by gel filtration and ion-exchange chromatography, which confirmed the high MW and indicated the charge heterogeneity of the reactive molecules. The 83D4 reactive antigen strongly bound to wheat-germ agglutinin and weakly to peanut lectin. No binding was found with lentil lectin or concanavalin A. Antigenic activity was strongly reduced by trypsin and subtilysin digestion and by treatment with sodium periodate, but it was not affected by neuraminidase. These results imply the glycoprotein nature of the 83D4-defined antigen and the involvement of carbohydrate, but probably not sialic acid, in the epitope. Purified 83D4 antigen did not display reactivity for mAb HMFG-1, directed against a polymorphic epithelial mucin, PEM, using ELISA, but bound mAb CC49 and weakly mAb B72.3, antibodies which define a tumour associated glycoprotein, TAG-72. Moreover CC49 and 83D4 showed similar reactivity pattern in immunoblotting assays. A double determinant radioimmunoassay confirmed that 83D4 antigen carries epitopes for mAb B72.3 and CC49. Competition radioimmunoassays clearly distinguished the 83D4 defined epitope from those recognised by B72.3 and CC49, demonstrating that antibody 83D4 identifies a unique epitope. It is suggested that the antigens identified by mAb 83D4 and by mAb B72.3 and CC49 may form part of the same family of carcinoma associated glycoproteins.

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Selected References

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