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http://dx.doi.org/10.5483/BMBRep.2016.49.5.241

Corosolic acid ameliorates acute inflammation through inhibition of IRAK-1 phosphorylation in macrophages  

Kim, Seung-Jae (Department of Physiology, Keimyung University School of Medicine)
Cha, Ji-Young (Department of Biochemistry, Lee Gil Ya Cancer and Diabetes Institute, Gachon University)
Kang, Hye Suk (Department of Physiology, Keimyung University School of Medicine)
Lee, Jae-Ho (Department of Physiology, Keimyung University School of Medicine)
Lee, Ji Yoon (Severance Biomedical Science Institute, Yonsei University College of Medicine)
Park, Jae-Hyung (Department of Physiology, Keimyung University School of Medicine)
Bae, Jae-Hoon (Department of Physiology, Keimyung University School of Medicine)
Song, Dae-Kyu (Department of Physiology, Keimyung University School of Medicine)
Im, Seung-Soon (Department of Physiology, Keimyung University School of Medicine)
Publication Information
BMB Reports / v.49, no.5, 2016 , pp. 276-281 More about this Journal
Abstract
Corosolic acid (CA), a triterpenoid compound isolated from Lagerstroemia speciosa L. (Banaba) leaves, exerts anti-inflammatory effects by regulating phosphorylation of interleukin receptor- associated kinase (IRAK)-2 via the NF-κB cascade. However, the protective effect of CA against endotoxic shock has not been reported. LPS (200 ng/mL, 30 min) induced phosphorylation of IRAK-1 and treatment with CA (10 μM) significantly attenuated this effect. In addition, CA also reduced protein levels of NLRP3 and ASC which are the main components of the inflammasome in BMDMs. LPS-induced inflammasome assembly through activation of IRAK-1 was down-regulated by CA challenge. Treatment with Bay11-7082, an inhibitor of IκB-α, had no effect on CA-mediated inhibition of IRAK-1 activation, indicating that CA-mediated attenuation of IRAK-1 phosphorylation was independent of NF-κB signaling. These results demonstrate that CA ameliorates acute inflammation in mouse BMDMs and CA may be useful as a pharmacological agent to prevent acute inflammation.
Keywords
Acute inflammation; Corosolic acid; Inflammasome; IRAK-1; Macrophages;
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