PMID- 29396047 OWN - NLM STAT- MEDLINE DCOM- 20190730 LR - 20211204 IS - 1096-0023 (Electronic) IS - 1043-4666 (Linking) VI - 108 DP - 2018 Aug TI - Fisetin inhibits TNF-alpha/NF-kappaB-induced IL-8 expression by targeting PKCdelta in human airway epithelial cells. PG - 247-254 LID - S1043-4666(18)30004-8 [pii] LID - 10.1016/j.cyto.2018.01.004 [doi] AB - Fisetin (3,7,3',4'-tetrahydroxyflavone), a natural flavonoid, is a therapeutic agent for respiratory inflammatory diseases such as chronic obstructive pulmonary disease (COPD). However, detailed molecular mechanisms regarding the target protein of fisetin remain unknown. Fisetin significantly reduces tumour necrosis factor alpha (TNF-alpha)-induced interleukin (IL)-8 levels by inhibiting both nuclear factor kappa B (NF-kappaB) transcriptional activity and the phosphorylation of its upstream effectors. We show that fisetin prevents interactions between protein kinase C (PKC)delta and TNF receptor-associated factor 2 (TRAF2), thereby inhibiting the inhibitor of kappa B kinase (IKK)/NF-kappaB downstream signalling cascade. Furthermore, we found that fisetin directly binds to PKCdelta in vitro. Our findings provide evidence that fisetin inhibits the TNF-alpha-activated IKK/NF-kappaB cascade by targeting PKCdelta, thereby mediating inflammatory diseases such as COPD. These data suggest that fisetin is a good therapeutic drug for the treatment of inflammatory lung diseases, such as COPD, by inhibiting the TNF-alpha/NF-kappaB signalling pathway. CI - Copyright (c) 2018 Elsevier Ltd. All rights reserved. FAU - Lee, Seoghyun AU - Lee S AD - Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang, Cheongju, Chungbuk 28116, Republic of Korea; College of Bioscience and Biotechnology, Chungnam National University, Daejeon 34134, Republic of Korea. FAU - Ro, Hyunju AU - Ro H AD - College of Bioscience and Biotechnology, Chungnam National University, Daejeon 34134, Republic of Korea. FAU - In, Hyun Ju AU - In HJ AD - Division of Vaccine Research, Korea National Research Institute of Health, Korea Centers for Disease Control and Prevention, Cheongju, Chungbuk 28159, Republic of Korea. FAU - Choi, Ji-Hee AU - Choi JH AD - Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang, Cheongju, Chungbuk 28116, Republic of Korea. FAU - Kim, Mun-Ock AU - Kim MO AD - Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang, Cheongju, Chungbuk 28116, Republic of Korea. FAU - Lee, Jinhyuk AU - Lee J AD - Korean Bioinformation Center (KOBIC), Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong, Daejeon 34141, Republic of Korea. FAU - Hong, Sung-Tae AU - Hong ST AD - Department of Anatomy & Cell Biology, College of Medicine, Chungnam National University, 266, Munhwa-Ro, Daejeon 35015, Republic of Korea. Electronic address: mogwai@cnu.ac.kr. FAU - Lee, Su Ui AU - Lee SU AD - Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang, Cheongju, Chungbuk 28116, Republic of Korea; Immunotherapy Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Yuseong-gu, Daejeon 34141, Republic of Korea. Electronic address: iamsuui@kribb.re.kr. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20180201 PL - England TA - Cytokine JT - Cytokine JID - 9005353 RN - 0 (CXCL8 protein, human) RN - 0 (Flavonoids) RN - 0 (Flavonols) RN - 0 (Interleukin-8) RN - 0 (NF-kappa B) RN - 0 (TNF Receptor-Associated Factor 2) RN - 0 (Tumor Necrosis Factor-alpha) RN - EC 2.7.11.13 (Protein Kinase C-delta) RN - OO2ABO9578 (fisetin) MH - Epithelial Cells/*drug effects/enzymology MH - Flavonoids/*pharmacology MH - Flavonols MH - HEK293 Cells MH - Humans MH - Interleukin-8/*metabolism MH - Molecular Docking Simulation MH - NF-kappa B/*antagonists & inhibitors/metabolism MH - Phosphorylation MH - Protein Binding MH - Protein Kinase C-delta/*metabolism MH - *Signal Transduction MH - TNF Receptor-Associated Factor 2/metabolism MH - Tumor Necrosis Factor-alpha/*metabolism OTO - NOTNLM OT - Chronic obstructive pulmonary disease (COPD) OT - Fisetin OT - IL-8 OT - PKCdelta OT - TNF-alpha/NF-kappaB pathway EDAT- 2018/02/06 06:00 MHDA- 2019/07/31 06:00 CRDT- 2018/02/04 06:00 PHST- 2017/10/10 00:00 [received] PHST- 2018/01/02 00:00 [revised] PHST- 2018/01/04 00:00 [accepted] PHST- 2018/02/06 06:00 [pubmed] PHST- 2019/07/31 06:00 [medline] PHST- 2018/02/04 06:00 [entrez] AID - S1043-4666(18)30004-8 [pii] AID - 10.1016/j.cyto.2018.01.004 [doi] PST - ppublish SO - Cytokine. 2018 Aug;108:247-254. doi: 10.1016/j.cyto.2018.01.004. Epub 2018 Feb 1.