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. 1988 Jun;8(6):2479–2483. doi: 10.1128/mcb.8.6.2479

Transcriptional modulation of transin gene expression by epidermal growth factor and transforming growth factor beta.

C M Machida 1, L L Muldoon 1, K D Rodland 1, B E Magun 1
PMCID: PMC363448  PMID: 3043179

Abstract

Transin is a transformation-associated gene which is expressed constitutively in rat fibroblasts transformed by a variety of oncogenes and in malignant mouse skin carcinomas but not benign papillomas or normal skin. It has been demonstrated that, in nontransformed Rat-1 cells, transin RNA expression is modulated positively by epidermal growth factor (EGF) and negatively by transforming growth factor beta (TGF-beta); other peptide growth factors were found to have no effect on transin expression. Results presented here indicate that both protein synthesis and continuous occupancy of the EGF receptor by EGF were required for sustained induction of transin RNA. Treatment with TGF-beta inhibited the ability of EGF to induce transin, whether assayed at the transcriptional level by nuclear run-on analysis or at the level of transin RNA accumulation by Northern (RNA) blot analysis of cellular RNA. TGF-beta both blocked initial induction of transin transcription by EGF and halted established production of transin transcripts during prolonged treatment. These results suggest that TGF-beta acts at the transcriptional level to antagonize EGF-mediated induction of transin gene expression.

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