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. 1984 Aug;81(16):5227–5231. doi: 10.1073/pnas.81.16.5227

Monoclonal antibodies of predefined specificity detect activated ras gene expression in human mammary and colon carcinomas.

P H Hand, A Thor, D Wunderlich, R Muraro, A Caruso, J Schlom
PMCID: PMC391671  PMID: 6382261

Abstract

Monoclonal antibodies (MAbs) of predefined specificity have been generated by utilizing a synthetic peptide reflecting amino acid positions 10-17 of the Hu-rasT24 gene product as immunogen. These MAbs, designated RAP-1 through RAP-5 (RA, ras; P, peptide), have been shown to react with the ras gene product p21. Since the Hu-ras reactive determinants (positions 10-17) have been predicted to be within the tertiary structure of the p21 molecule, it was not unexpected that denaturation of cell extracts or tissue sections with Formalin or glutaraldehyde enhanced binding of the RAP MAbs. When paraffin-embedded Formalin-fixed tissue sections and the avidin-biotin complex immunoperoxidase method were used, the RAP MAbs clearly defined enhanced ras p21 expression in the majority of human colon and mammary carcinomas. The majority of all abnormal ducts and lobules from fibroadenoma and fibrocystic disease patients were negative, as were all normal mammary and colonic epithelia examined. The findings reported here form the basis for quantitative radioimmunoassays for a ras translational product and provide a means to evaluate ras p21 expression within individual cells of normal tissues and benign, "premalignant," and malignant lesions.

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