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. 1987 Mar;6(3):605–610. doi: 10.1002/j.1460-2075.1987.tb04797.x

Overexpression of the EGF receptor-related proto-oncogene erbB-2 in human mammary tumor cell lines by different molecular mechanisms.

M H Kraus, N C Popescu, S C Amsbaugh, C R King
PMCID: PMC553440  PMID: 3034598

Abstract

Amplification of the erbB/EGF receptor and a structurally related gene, designated erbB-2, have previously been detected in a variety of human tumors. In a series of human mammary tumor cell lines, analysis of transcripts of these genes revealed elevated levels of one or the other in more than 60% of tumors analyzed. Eight cell lines demonstrated erbB-2 mRNA levels ranging from 4- to 128-fold above those of normal controls. erbB-2 expression was evaluated in comparison to the expression level of actin observed in these cell lines. There was no evidence of an aberrantly sized erbB-2 transcript in any of these lines. Immunoblot analysis indicated elevation in levels of the 185-kd product of the erbB-2 gene expressed by these cells. In four lines erbB-2 gene amplification in the absence of an apparent gene rearrangement was demonstrated. In a representative cell line of this type, SK-BR-3, the amplified erbB-2 gene copies were located in an aberrant chromosomal location. Four additional cell lines, which demonstrated 4- to 8-fold overexpression of erbB-2 mRNA, did not exhibit gene amplification. In a representative cell line of this type ZR-75-1, an apparently normal chromosomal location was found for the erbB-2 gene. Our findings indicate that overexpression of the erbB-2 gene in mammary tumor cell lines is frequent and associated with different genetic abnormalities.

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