PMID- 15138489 OWN - NLM STAT- MEDLINE DCOM- 20040616 LR - 20181113 IS - 0007-0920 (Print) IS - 1532-1827 (Electronic) IS - 0007-0920 (Linking) VI - 90 IP - 10 DP - 2004 May 17 TI - The anticancer drug mithramycin A sensitises tumour cells to apoptosis induced by tumour necrosis factor (TNF). PG - 2025-31 AB - In this report we show that mithramycin considerably increases the direct cytotoxic effect of tumour necrosis factor (TNF) on tumour cells in vitro. Sensitisation to TNF-induced apoptosis was prevented by the broad caspase inhibitor zVAD-fmk, whereas overexpression of Bcl-2 had no effect. Mithramycin also potentiated cell death induced by Fas agonistic antibodies. In contrast, mithramycin reduced the percentage of cells undergoing apoptosis due to factor withdrawal. TNF-induced activation of NF-kappaB (NF-kappaB)-dependent gene expression was not modulated by mithramycin treatment. Concomitantly with the increased sensitivity, the protein level of the short-spliced cFLIP variant was downregulated. These results indicate that mithramycin enhances TNF-induced cell death in an NF-kappaB-independent manner, and suggest that the Fas-associated death domain protein plays a crucial role in the TNF-sensitising effect of mithramycin. FAU - Duverger, V AU - Duverger V AD - EiRx Therapeutics Ltd, 2800 Cork Airport Business Park, Kinsale Road, Cork, Ireland. FAU - Murphy, A-M AU - Murphy AM FAU - Sheehan, D AU - Sheehan D FAU - England, K AU - England K FAU - Cotter, T G AU - Cotter TG FAU - Hayes, I AU - Hayes I FAU - Murphy, F J AU - Murphy FJ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Br J Cancer JT - British journal of cancer JID - 0370635 RN - 0 (Adaptor Proteins, Signal Transducing) RN - 0 (Carrier Proteins) RN - 0 (FADD protein, human) RN - 0 (Fas-Associated Death Domain Protein) RN - 0 (Tumor Necrosis Factor-alpha) RN - 0 (fas Receptor) RN - 97666-60-9 (mithramycin A) RN - NIJ123W41V (Plicamycin) SB - IM MH - *Adaptor Proteins, Signal Transducing MH - Apoptosis/*drug effects MH - Carrier Proteins/*pharmacology MH - Drug Resistance, Neoplasm MH - Fas-Associated Death Domain Protein MH - Gene Expression Regulation, Neoplastic/drug effects MH - Humans MH - Leukemia, Erythroblastic, Acute/pathology MH - Leukemia, Promyelocytic, Acute/pathology MH - Plicamycin/*analogs & derivatives/*pharmacology MH - Tumor Cells, Cultured MH - Tumor Necrosis Factor-alpha/*pharmacology MH - fas Receptor PMC - PMC2409467 EDAT- 2004/05/13 05:00 MHDA- 2004/06/17 05:00 PMCR- 2005/04/20 CRDT- 2004/05/13 05:00 PHST- 2004/05/13 05:00 [pubmed] PHST- 2004/06/17 05:00 [medline] PHST- 2004/05/13 05:00 [entrez] PHST- 2005/04/20 00:00 [pmc-release] AID - 6601824 [pii] AID - 10.1038/sj.bjc.6601824 [doi] PST - ppublish SO - Br J Cancer. 2004 May 17;90(10):2025-31. doi: 10.1038/sj.bjc.6601824.