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. 1994 Jul 19;91(15):7202–7206. doi: 10.1073/pnas.91.15.7202

Overexpression of ERBB2 in human mammary epithelial cells signals inhibition of transcription of the E-cadherin gene.

B D'souza 1, J Taylor-Papadimitriou 1
PMCID: PMC44367  PMID: 7913748

Abstract

Overexpression of the ERBB2 receptor in transfectants of a human mammary epithelial cell line (MTSV1-7) is associated with a reduced ability to undergo morphogenesis in vitro and with a decreased level of expression of the E-cadherin and alpha 2 integrin genes. The inhibition of expression of the adhesion molecules has been shown to be at the level of transcription by using nuclear run-on assays and by following transcription of a reporter gene fused to 5' sequences of the E-cadherin gene. To relate the effects on gene transcription to a functional ERBB2 protein, signaling from the receptor was inhibited by the antibody 4D5, which blocks phosphorylation of ERBB2 on tyrosine residues and association of the protein with the GRB2/Sem5 protein. After treatment with the antibody 4D5, the ERBB2 transfectants regain the ability to form three-dimensional structures in collagen gels and the rates of transcription of the genes encoding the E-cadherin and the alpha 2 integrin subunit are restored to the levels seen in MTSV1-7neo cells. These results demonstrate that the inhibition of morphogenesis and transcription of specific adhesion molecules in human mammary epithelial cells can be affected by signals generated by the ERBB2 receptor and suggest a role for ERBB2 overexpression in tumor progression and metastasis.

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