title: Quercetin regulates Th1/Th2 balance in a murine model of asthma.
abstract: Quercetin is found to be the most active of the flavonoids in studies and many medicinal plants owe much of their activity to their high Quercetin content. Quercetin has demonstrated significant anti-inflammatory activity because of direct inhibition of several initial processes of inflammation. However, its anti-allergic effect in the Th1/Th2 immune response was poorly understood. Recently, it was shown that T-bet and GATA-3 were master Th1 and Th2 regulatory transcription factors. In this study, we have attempted to determine whether Quercetin regulates Th1/Th2 cytokine production, T-bet and GATA-3 gene expression in OVA-induced asthma model mice. Quercetin reduced the increased levels of IL-4, Th2 cytokine production in OVA-sensitized and -challenged mice. The other side, it increased IFN-gamma, Th1 cytokine production in Quercetin administrated mice. We also examined to ascertain whether Quercetin could influence Eosinophil peroxidase (EPO) activity. The administration of Quercetin before the last airway OVA challenge resulted in a significant inhibition of all asthmatic reactions. Accordingly, this study may provide evidence that Quercetin plays a critical role in the amelioration of the pathogenetic process of asthma in mice. These findings provide new insight into the immunopharmacological role of Quercetin in terms of its effects in a murine model of asthma, and also broaden current perspectives in our understanding of the immunopharmacological functions of Quercetin.
authors.affiliation: Department of Pediatrics, Pusan National University College of Medicine, Busan 602-739, South Korea.
authors.forename: Hee-ju
authors.initials: HJ
authors.lastname: Park
authors.forename: Chang-Min
authors.initials: CM
authors.lastname: Lee
authors.forename: In Duk
authors.initials: ID
authors.lastname: Jung
authors.forename: Jun Sik
authors.initials: JS
authors.lastname: Lee
authors.forename: Young-il
authors.initials: YI
authors.lastname: Jeong
authors.forename: Jeong Hyun
authors.initials: JH
authors.lastname: Chang
authors.forename: Sung-Hak
authors.initials: SH
authors.lastname: Chun
authors.forename: Min-Jae
authors.initials: MJ
authors.lastname: Kim
authors.forename: Il-Whan
authors.initials: IW
authors.lastname: Choi
authors.forename: Soon-Cheol
authors.initials: SC
authors.lastname: Ahn
authors.forename: Yong Kyoo
authors.initials: YK
authors.lastname: Shin
authors.forename: Seok-Ran
authors.initials: SR
authors.lastname: Yeom
authors.forename: Yeong-Min
authors.initials: YM
authors.lastname: Park
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D001249:Asthma / Q000276:immunology* / Q000473:pathology; D001992:Bronchoalveolar Lavage Fluid / Q000276:immunology; D004195:Disease Models, Animal; D047209:Eosinophil Peroxidase / Q000378:metabolism; D004804:Eosinophils / Q000187:drug effects / Q000276:immunology; D005260:Female; D050990:GATA3 Transcription Factor / Q000037:antagonists & inhibitors / Q000276:immunology / Q000378:metabolism; D007371:Interferon-gamma / Q000187:drug effects / Q000378:metabolism; D015847:Interleukin-4 / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000276:immunology; D015848:Interleukin-5 / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000276:immunology; D008168:Lung / Q000276:immunology / Q000473:pathology; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin / Q000276:immunology / Q000494:pharmacology; D011794:Quercetin / Q000494:pharmacology*; D020825:T-Box Domain Proteins / Q000276:immunology / Q000378:metabolism; D018417:Th1 Cells / Q000187:drug effects / Q000276:immunology*; D018418:Th2 Cells / Q000187:drug effects / Q000276:immunology*; D000098815:T-bet Transcription Factor
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000975:Antioxidants; D050990:GATA3 Transcription Factor; C494748:Gata3 protein, mouse; D015848:Interleukin-5; D061965:Matrix Metalloproteinase Inhibitors; D020825:T-Box Domain Proteins; D000098815:T-bet Transcription Factor; D015847:Interleukin-4; D007371:Interferon-gamma; D010047:Ovalbumin; D011794:Quercetin; D047209:Eosinophil Peroxidase; D020780:Matrix Metalloproteinase 9