Delineation of four carcinoembryonic antigen (CEA) related antigens in normal plasma by transblot studies using monoclonal anti-CEA antibodies with different epitope specificities |
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Authors: | M Neumaier U Fenger C Wagener |
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Institution: | Institut für Klinische Biochemie der Universität, Sigmund-Freud-Str. 25, 5300 Bonn 1, F.R.G. |
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Abstract: | Antigens related to the carcinoembryonic antigen (CEA) were isolated from normal human plasma by perchloric acid extraction, gel permeation chromatography and immunoaffinity chromatography using a monoclonal antibody with broad specificity and high affinity. The antigens were separated by SDS-polyacrylamide gel electrophoresis and transferred to nitrocellulose. The binding of five monoclonal anti-CEA antibodies with different epitope specificities to the immobilized antigens was analyzed. Two antigens with mol. wts of greater than 200,000 and 177,000 bound all five antibodies, and two antigens with mol. wts of 114,000 and 85,000 bound three of the five antibodies. The findings reported indicate that even monoclonal antibodies with high specificity for colonic cancer CEA detect CEA-related antigens in normal human plasma. |
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Keywords: | CEA carcinoembryonic antigen MAb monoclonal antibody NCA non-specific cross-reacting antigen NRS normal rabbit serum PBS phosphatebuffered saline TBS Tris-buffered saline TEX tumour-extracted cross-reacting antigen |
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