5-methylthiopentyl Isothiocyanate, a Sulforaphane Analogue, Inhibits Pro-inflammatory Cytokines by Regulating LPS/ATP-mediated NLRP3 Inflammasome Activation


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Abstract

Background:Pro-inflammatory cytokines secreted from activated macrophages and astrocytes are crucial mediators of inflammation for host defense. Among them, the secretion of IL-1β, a major pro-inflammatory cytokine, is especially mediated by the activation of NLRP3 inflammasome. Pro-IL-1β, which is produced in response to the invaded pathogens, such as LPS, is cleaved and matured in the NLRP3 inflammasome by the recognition of ATP. Excessively activated IL-1β induces other immune cells, resulting in the up-regulation of inflammation. Therefore, regulation of NLRP3 inflammasome can be a good strategy for alleviating inflammation.

Objective:Our study aimed to examine whether 5-methylthiopentyl isothiocyanate, a sulforaphane analogue (berteroin), has an anti-inflammatory effect on the NLRP3 inflammasome activation induced by LPS and ATP.

Methods:Primary bone marrow-derived macrophages (BMDMs) and astrocytes were stimulated by LPS and ATP with the treatment of 5-methylthiopentyl isothiocyanate, a sulforaphane analogue. The secretion of pro-inflammatory cytokines was measured by ELISA, and the expression level of NLRP3 inflammasome-associated proteins was detected by western blot. The association of NLRP3 inflammasome was assessed by co-immunoprecipitation, and the formation of ASC specks was evaluated by fluorescent microscope.

Results:5-methylthiopentyl isothiocyanate, a sulforaphane analogue (berteroin), decreased the release of pro-inflammatory cytokines, IL-1β, and IL-6 in the BMDMs. Berteroin notably prevented the formation of both NLRP3 inflammasome and ASC specks, which reduced the secretion of IL-1β. Additionally, berteroin reduced the IL-1β secretion and cleaved IL-1β expression in the primary astrocytes.

Discussion and Conclusion:These results indicated the anti-inflammatory effects of 5- methylthiopentyl isothiocyanate (berteroin) by regulating NLRP3 inflammasome activation, suggesting that berteroin could be the potential natural drug candidate for the regulation of inflammation.

About the authors

Su-Bin Choi

Department of Biomedical Engineering, College of Life Science and Biotechnology,, Dongguk University

Email: info@benthamscience.net

Ji-Hye Kim

Department of Biomedical Engineering, College of Life Science and Biotechnology,, Dongguk University

Email: info@benthamscience.net

Sehee Kwon

Department of Biomedical Engineering, College of Life Science and Biotechnology, Dongguk University

Email: info@benthamscience.net

Na-Hyun Ahn

Department of Biomedical Engineering, College of Life Science and Biotechnology,, Dongguk University, Seoul,

Email: info@benthamscience.net

Joo-Hee Lee

Department of Biomedical Engineering, College of Life Science and Biotechnology,, Dongguk University

Email: info@benthamscience.net

Woong-Suk Yang

, National Institute for Nanomaterials Technology (NINT)

Email: info@benthamscience.net

Cheorl-Ho Kim

, Department of Biological Sciences

Author for correspondence.
Email: info@benthamscience.net

Seung-Hoon Yang

Department of Biomedical Engineering, College of Life Science and Biotechnology, Dongguk University

Author for correspondence.
Email: info@benthamscience.net

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