hinokitiol negatively regulates immune responses through cell cycle arrest in concanavalin a-activated lymphocytes

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2015
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Abstract
Autoimmune diseases are a group of chronic inflammatory diseases that arise from inappropriate inflammatory responses. Hinokitiol, isolated from the wood of Chamaecyparis taiwanensis, engages in multiple biological activities. Although hinokitiol has been reported to inhibit inflammation, its immunological regulation in lymphocytes remains incomplete. Thus, we determined the effects of hinokitiol on concanavalin A- (ConA-) stimulated T lymphocytes from the spleens of mice. In the present study, the MTT assay revealed that hinokitiol (1–5 μM) alone did not affect cell viability of lymphocytes, but at the concentration of 5 μM it could reduce ConA-stimulated T lymphocyte proliferation. Moreover, propidium iodide (PI) staining revealed that hinokitiol arrested cell cycle of T lymphocytes at the G0/G1 phase. Hinokitiol also reduced interferon gamma (IFN-γ) secretion from ConA-activated T lymphocytes, as detected by an ELISA assay. In addition, hinokitiol also downregulated cyclin D3, E2F1, and Cdk4 expression and upregulated p21 expression. These results revealed that hinokitiol may regulate immune responses. In conclusion, we for the first time demonstrated that hinokitiol upregulates p21 expression and attenuates IFN-γ secretion in ConA-stimulated T lymphocytes, thereby arresting cell cycle at the G0/G1 phase. In addition, our findings also indicated that hinokitiol may provide benefits to treating patients with autoimmune diseases.
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chung2015evidence-basedhinokitiol Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Chi-Li Chung;Kam-Wing Leung;Wan-Jung Lu;Ting-Lin Yen;Chia-Fu He;Joen-Rong Sheu;Kuan-Hung Lin;Li-Ming Lien
Journal ACS applied materials & interfaces
Year 2015
DOI
10.1155/2015/595824
URL
http://dx.doi.org/10.1155/2015/595824
Keywords
Other systems of medicine

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