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Regulation of the Release of Tumour Necrosis Factor (TNF)alpha and Soluble TNF Receptor by Gamma Irradiation and Interferon Gamma in Ewing's Sarcoma/peripheral Primitive Neuroectodermal Tumour Cells

Overview
Specialty Oncology
Date 1997 Jan 1
PMID 9201246
Citations 5
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Abstract

This study analyses the production of tumour necrosis factor (TNF)alpha and soluble TNF receptor (sTNF-R) before and after exposure to gamma irradiation and interferon gamma (IFN gamma) in 12 cell lines derived from Ewing's sarcoma (ES)/peripheral primitive neuroectodermal tumours (pPNET). Supernatants from ES/pPNET cell cultures were tested in a TNF alpha-specific amplified enzyme-linked immunosorbent assay (ELISA), a bioassay, and sTNF-Rp55 and sTNF-Rp75 ELISA. The tumour cell lines released minimal amounts of TNF alpha, prominent amounts of sTNF-Rp55 (7/12 cell lines) and no sTNF-Rp75. Exposure to gamma irradiation (5 Gy) either induced (3/12) cell lines) or up-regulated (3/12 cell lines) TNF alpha release without changing sTNF-Rp55 and sTNF-Rp75 levels. Priming of cultures with recombinant human IFN gamma (rhIFN gamma) markedly enhanced TNF alpha secretion in the radiation-responsive cell lines and had no influence on sTNF-Rp55 and sTNF-Rp75 levels. rhIFN gamma affected the magnitude rather than the sensitivity of the radiation response. The TNF alpha secreted was bioactive, as shown by its cytotoxic effect of WEHI-164 cells, and neutralization of its activity by anti-TNF alpha monoclonal antibody. Herbimycin A (a tyrosine-specific protein kinase inhibitor) but not calphostin C (a protein kinase C inhibitor), H89 (a protein kinase A inhibitor), AA-COCF3 (a specific inhibitor of phospholipase A2) and MK-886 (a specific inhibitor of 5-lipoxygenase) abrogated gamma-irradiation-stimulated TNF alpha release. The antioxidants N-acetylcysteine, nordihydroguaiaretic acid and mepacrine dose-dependently inhibited gamma-irradiation-mediated TNF alpha production. Collectively our findings indicate that IFN gamma priming potentiates the secretion of bioactive TNF alpha by ES/pPNET cells in response to gamma irradiation without affecting sTNF-R release. The data suggest a requirement for protein tyrosine kinase activity and a role for reactive oxygen species in the gamma-irradiation-mediated intracellular signalling pathway leading to TNF alpha production.

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