Journal of Cell Science, Vol 101, Issue 1 183-189, Copyright © 1992 by Company of Biologists

JOURNAL ARTICLES

Analysis of p53 expression in human tumours: an antibody raised against human p53 expressed in Escherichia coli

CA Midgley, CJ Fisher, J Bartek, B Vojtesek, D Lane and DM Barnes
Department of Biochemistry, University of Dundee, UK.

A cDNA encoding the complete normal human p53 protein was expressed in Escherichia coli using an expression system based on the bacteriophage T7 promoter. The cDNA was adapted so that the full-length protein was produced without fusion to any other sequence. Large amounts of the protein were isolated and the purified protein used to produce very high titre polyclonal antibodies to p53. These new antibodies permit the sensitive detection of p53 and p53 complexes in ELISA and immunoblotting assays. Most importantly, they also permit the detection of p53 in archival tumour material that has been conventionally fixed in formalin and embedded in paraffin wax. Using this reagent we have found that aberrant expression of p53 is a frequent feature of human breast cancer. We are able to recognise six different classes of p53 expression pattern that may be of help in the subclassification of breast tumours.

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