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. 1993 Feb 1;90(3):863–867. doi: 10.1073/pnas.90.3.863

Tumor necrosis factor alpha induces the expression of transforming growth factor alpha and the epidermal growth factor receptor in human pancreatic cancer cells.

W Schmiegel 1, C Roeder 1, J Schmielau 1, U Rodeck 1, H Kalthoff 1
PMCID: PMC45770  PMID: 8430098

Abstract

Recombinant human tumor necrosis factor (TNF)-alpha increased the expression of epidermal growth factor receptor (EGFR) mRNA and protein in all of six human pancreatic carcinoma cell lines tested. In addition, TNF-alpha increased the expression of an EGFR ligand, transforming growth factor (TGF)-alpha, at the mRNA and protein level in all cell lines. Increased expression of EGFR protein was associated with elevated steady-state EGFR mRNA levels. Nuclear run-on analysis showed that increase in EGFR mRNA was due to an increased rate of transcription. Induction of EGFR mRNA expression by TNF-alpha was abrogated by cycloheximide but occurred independently of TNF-alpha-induced production of TGF-alpha protein. Protein kinase A or Gi-type guanine nucleotide-binding proteins were not involved in this process as assessed by using appropriate stimulators and inhibitors of these signal transduction pathways. By contrast, staurosporine, an inhibitor of protein kinase C, partially inhibited, and 4-bromophenacyl bromide, a phospholipase inhibitor, completely inhibited TNF-alpha-dependent EGFR mRNA expression. The phospholipase C-specific inhibitor tricyclodecan-9-yl xanthogenate did not alter TNF-alpha-dependent EGFR mRNA expression, suggesting that phospholipase A2 is involved in the modulation of EGFR expression by TNF-alpha. The simultaneous induction of a ligand/receptor system by TNF-alpha suggests that this cytokine modulates autocrine growth-regulatory pathways in pancreatic cancer cells.

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Selected References

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