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Monoclonal antibodies define differential ras gene expression in malignant and benign colonic diseases

Nature volume 311, pages 562–565 (1984)Cite this article

Abstract

DNAs of some human tumours can transform NIH 3T3 fibroblast cells1–7, thus demonstrating the transforming potential of human ras genes (Hu-rasHa, Hu-rasKi, and Hu-rasN, respectively Harvey, Kirsten and neurohlastoma ras genes). Only a small percentage of a given type of human carcinoma, however, scores positive in this assay system8–10. Activation of ras and subsequent transformation of NIH 3T3 cells are either by a point mutation in the ras gene11–18 or enhanced expression of the normal, or proto-onc, ras gene19–21. If the transformation of a given human tumour involves the enhanced expression of the normal or cellular ras gene and the resulting gene product, the tumour DNA would probably score negative in the NIH 3T3 transfection assay. In human colon carcinoma, for example, lesions at position 12 of Hu-rasKi have been found8,21. None of nine colon carcinomas obtained at biopsy, however, contain the ras lesion at this position, using a Hu-rasHa probe22; one other colon carcinoma does appear to contain amplified proto–onc ras21, and other colon carcinomas do have increased levels of ras RNA23. There are at least three explanations for these observations. Either very few colon carcinomas contain point-mutated ras, the lesion in the majority of colon carcinomas is at a position other than 12, or ras activation in many colon carcinomas involves the enhanced expression of either the point-mutated or proto-onc form of a ras gene. We have now used monoclonal antibodies directed against a synthetic peptide reflecting sequences of the human T24 ras gene product to define ras p21 protein expression in a spectrum of colonie disease states. Immunohistochemical analyses of individual cells within tissue sections reveal differences in ras p21 expression in colon carcinomas compared with normal colonie epithelium, benign colon tumours and inflammatory or dysplastic colon lesions. Our data suggest that ras p21 expression is correlated with depth of carcinoma within the bowel wall, and is probably a relatively late event in colon carcinogenesis.

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Authors and Affiliations

  1. Laboratory of Tumor Immunology and Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, 20205, USA

    A. Thor, P. Horan Hand, D. Wunderlich, A. Caruso, R. Muraro & J. Schlom

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  2. P. Horan Hand
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  5. R. Muraro
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Thor, A., Hand, P., Wunderlich, D. et al. Monoclonal antibodies define differential ras gene expression in malignant and benign colonic diseases. Nature 311, 562–565 (1984). https://doi.org/10.1038/311562a0

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