Human carcinoma-associated antigen (HCA), isolated from the endometrial carcinoma cell line KLE-1 and ascitic fluid of a patient with ovarian carcinoma; comparison with epiglycanin.

T Thingstad, S Haavik, K Hansen, K Sletten, J F Codington, H Barsett

Index: Eur. J. Pharm. Sci. 6 , 121-129, (1998)

Full Text: HTML

Abstract

Human carcinoma-associated antigen (HCA), detected by the mouse monoclonal anti-epiglycanin antibody, AE-3, has been isolated from ascitic fluid taken from a patient with metastatic ovarian adenocarcinoma and from spent medium of the human endometrial carcinoma cell line KLE-1 and compared with epiglycanin. The ascitic fluid and the spent medium were concentrated by a Filtron Ultrasette 100 K Omega membrane and fractionated by gel filtration on Sepharose CL-2B. The active fractions which consisted mainly of glycoproteins having relative molecular weights in the range 1000-2000 kDa compared to dextrans, were further purified by affinity chromatography on a column of immobilized AE-3. The active fraction was subjected to SDS-PAGE and blotted onto a PVDF membrane. The amino acid composition of HCA isolated from the two sources, were related but not identical and both showed some differences from the amino acid composition of epiglycanin. They all have, however, compositions typical of mucin-type glycoproteins. The isoelectric point for HCA from both KLE-1 and ascitic fluid were determined to be at pH 1.8 and the buoyant densities were about 1.4 g/ml as determined by cesium trifluoroacetate gradient centrifugation.