Anti-inflammatory effect of honokiol is mediated by PI3K/Akt pathway suppression1

Authors

  • Byung Hun KIM,

    1. School of Bioscience and Biotechnology, and the Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon 200-701, Korea
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  • Jae Youl CHO

    Corresponding author
    1. School of Bioscience and Biotechnology, and the Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon 200-701, Korea
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  • 1

    This work was supported by a Korea Research Foundation Grant (KRF-2006-C00455 to Jae Youl CHO).

Correspondence to Prof Jae Youl CHO. Phn 82-33-250-6562. Fax 82-33-253-6560. E-mail jaecho@kangwon.ac.kr

Abstract

Aim: In this study, we investigated the regulatory effects of honokiol on various inflammatory events mediated by monocytes/macrophages (U937/RAW264.7 cells) and lymphocytes (splenic lymphocytes and CTLL-2 cells) and their putative action mechanism. Methods: In order to investigate the regulatory effects, various cell lines and primary cells (U937, RAW264.7, CTLL-2 cells, and splenic lymphocytes) were employed and various inflammatory events, such as the production of inflammatory mediators, cell adhesion, cell proliferation, and the early signaling cascade, were chosen. Results: Honokiol strongly inhibited various inflammatory responses, such as: (i) the upregulation of nitric oxide (NO), prostaglandin E2 and TNF-α production and costimulatory molecule CD80 induced by lipopolysaccharide (LPS); (ii) the functional activation of β1-integrin (CD29) assessed by U937 cell-cell and cell-fibronectin adhesions; (iii) the enhancement of lymphocytes and CD8+CTLL-2 cell proliferation stimulated by LPS, phytohemaglutinin A (PHA), and concanavalin A or interleukin (IL)-2; and (iv) the transcriptional upregulation of inducible NO synthase, TNF-α, cyclooxygenase-2, IL-12, and monocyte chemoattractant protein (MCP)-1. These anti-inflammatory effects of honokiol seem to be mediated by interrupting the early activated intracellular signaling molecule phosphoinositide 3-kinase (PI3K)/Akt, but not Src, the extracellular signal-regulated kinase, and p38, according to pharmacological, biochemical, and functional analyses. Conclusion: These results suggest that honokiol may act as a potent anti-inflammatory agent with multipotential activities due to an inhibitory effect on the PI3K/Akt pathway.

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