PMID- 10623619 OWN - NLM STAT- MEDLINE DCOM- 20000208 LR - 20121115 IS - 0006-291X (Print) IS - 0006-291X (Linking) VI - 267 IP - 1 DP - 2000 Jan 7 TI - Parthenolide inhibits activation of signal transducers and activators of transcription (STATs) induced by cytokines of the IL-6 family. PG - 329-33 AB - Progression of inflammatory processes correlates with the release of cell-derived mediators from the local site of inflammation. These mediators, including cytokines of the IL-1 and IL-6 families, act on host cells and exert their action by activating their signal transduction pathways leading to specific target gene activation. Parthenolide, a sesquiterpene lactone found in many medical plants, is an inhibitor of IL-1-type cytokine signaling that blocks the activation of NF-kappaB. Here we show that parthenolide is also an effective inhibitor of IL-6-type cytokines. It inhibits IL-6-type cytokine-induced gene expression by blocking STAT3 phosphorylation on Tyr705. This prevents STAT3 dimerization necessary for its nuclear translocation and consequently STAT3-dependent gene expression. This is a new molecular mechanism of parthenolide action that additionally explains its anti-inflammatory activities. CI - Copyright 2000 Academic Press. FAU - Sobota, R AU - Sobota R AD - Institute of Molecular Biology, Jagiellonian University, 3 Mickiewicza Avenue, Krakow, 31-120, Poland. FAU - Szwed, M AU - Szwed M FAU - Kasza, A AU - Kasza A FAU - Bugno, M AU - Bugno M FAU - Kordula, T AU - Kordula T LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Biochem Biophys Res Commun JT - Biochemical and biophysical research communications JID - 0372516 RN - 0 (Acute-Phase Proteins) RN - 0 (Cytokines) RN - 0 (DNA-Binding Proteins) RN - 0 (Interleukin-1) RN - 0 (Interleukin-6) RN - 0 (NF-kappa B) RN - 0 (OSM protein, human) RN - 0 (Peptides) RN - 0 (Recombinant Fusion Proteins) RN - 0 (STAT3 Transcription Factor) RN - 0 (STAT3 protein, human) RN - 0 (Sesquiterpenes) RN - 0 (Trans-Activators) RN - 0 (alpha 1-Antichymotrypsin) RN - 106956-32-5 (Oncostatin M) RN - 2RDB26I5ZB (parthenolide) SB - IM MH - Acute-Phase Proteins/metabolism MH - Carcinoma, Hepatocellular MH - Cytokines/*pharmacology MH - DNA-Binding Proteins/*metabolism MH - Gene Expression Regulation, Neoplastic/drug effects MH - Humans MH - Interleukin-1/pharmacology MH - Interleukin-6/*pharmacology MH - Liver Neoplasms MH - NF-kappa B/antagonists & inhibitors/*metabolism MH - Oncostatin M MH - Peptides/pharmacology MH - Recombinant Fusion Proteins/biosynthesis MH - STAT3 Transcription Factor MH - Sesquiterpenes/*pharmacology MH - Signal Transduction/*drug effects/physiology MH - Trans-Activators/*metabolism MH - Transcriptional Activation MH - Transfection MH - Tumor Cells, Cultured MH - alpha 1-Antichymotrypsin/genetics EDAT- 2000/01/07 00:00 MHDA- 2000/01/07 00:01 CRDT- 2000/01/07 00:00 PHST- 2000/01/07 00:00 [pubmed] PHST- 2000/01/07 00:01 [medline] PHST- 2000/01/07 00:00 [entrez] AID - 10.1006/bbrc.1999.1948 [doi] AID - S0006-291X(99)91948-4 [pii] PST - ppublish SO - Biochem Biophys Res Commun. 2000 Jan 7;267(1):329-33. doi: 10.1006/bbrc.1999.1948.