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Monoclonal antibodies have been raised against a cell line derived from a dimethylhydrazine-induced rat colon carcinoma. One of these antibodies (MAb E4) has previously been shown to react slightly with normal small intestine and colon, and not with other normal tissues as determined by immunohistochemistry. Using Western immunoblotting we confirmed this tumor specificity. Therefore, the Mr of approx. 66,000 glycosylated antigen (pE4) recognized by MAb E4 appeared to be a potential marker of colon carcinoma. Fifteen human tumor cell lines were tested by flow cytometry for the expression of pE4. This antigen was not detected on these cells. In the rat colon carcinoma cell, pE4 was exclusively found on the cell membrane. pE4 was purified to near homogeneity by immunoaffinity chromatography. The first 20 N-terminal amino acids were identified. Comparison with the NBRF data bank did not reveal a complete homology with known sequenced proteins but similarities were found with the mouse L3T4 precursor, the env polyprotein of human immunodeficiency virus type I, flagellin from Halobacterium halobium and the gp30 from hepatitis B surface antigen. Homology was always found in transmembranous or hydrophobic domains of these proteins. By indirect immunofluorescence analysis of adherent cells and size exclusion chromatography under native conditions, pE4 was found to interact with other molecules and perhaps to be involved in intercellular contact.
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K Meflah
November 1985,
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C Chadeneau, and
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K Meflah
January 1983,
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C Chadeneau, and
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K Meflah
February 1986,
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C Chadeneau, and
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K Meflah
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C Chadeneau, and
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C Chadeneau, and
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K Meflah
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C Chadeneau, and
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K Meflah
January 1990,
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C Chadeneau, and
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H M Blottière, and
M Grégoire, and
J Y Douillard, and
K Meflah
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C Chadeneau, and
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K Meflah
December 1996,
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C Chadeneau, and
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H M Blottière, and
M Grégoire, and
J Y Douillard, and
K Meflah
January 1990,
International journal of cancer,
