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Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω
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Ä Ö Ü ä ö ü ß
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        MiR-218-5p Suppresses the Killing Effect of Natural Killer Cell to Lung Adenocarcinoma by Targeting SHMT1

        Quanjun Yang,Jingjing Li,Yili Hu,Xiaofei Tang,Lili Yu,Lihua Dong,Diandian Chen 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.6

        Purpose: Lung adenocarcinoma (LA) is one of the major types of lung cancer. MicroRNAs (miRNAs) play an essential role in regulatingresponses of natural killer (NK) cells to cancer malignancy. However, the mechanism of miR-218-5p involved in the killingeffect of NK cells to LA cells remains poorly understood. Materials and Methods: The expression of miR-218-5p was examined by quantitative real-time polymerase chain reaction (qRTPCR). Serine hydroxymethyl transferase 1 (SHMT1) level was detected by qRT-PCR or western blots. Cytokines production ofinterferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) were detected by ELISA. The killing effect of NK cells to LA cells was investigatedusing lactate dehydrogenase cytotoxicity assay kit. The interaction of miR-218-5p and SHMT1 was probed by luciferaseactivity assay. Xenograft model was established to investigate the killing effect of NK cells in vivo. Results: miR-218-5p was enhanced and SHMT1 was inhibited in NK cells of LA patients, whereas stimulation of interleukin-2(IL-2) reversed their abundances. Addition of miR-218-5p reduced IL-2-induced cytokines expression and cytotoxicity in NK-92against LA cells. Moreover, SHMT1 was negatively regulated by miR-218-5p and attenuated miR-218-5p-mediated effect on cytotoxicity,IFN-γ and TNF-α secretion in IL-2-activated NK cells. In addition, miR-218-5p exhaustion inhibited tumor growth bypromoting killing effect of NK cells. Conclusion: miR-218-5p suppresses the killing effect of NK cells to LA cells by targeting SHMT1, providing a potential target forLA treatment by ameliorating NK cells function.

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        Bioactivity-guided Fractionation and Analysis of Compounds with Anti-influenza Virus Activity from Gardenia jasminoides Ellis

        Quanjun Yang,Xiaolan Cui,Bin Wu,Yujing Shi,Xiaowei Du,Mingsong Fan,Zhaolin Sun,Chenggang Huang 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.1

        Bioassay-guided fractionation of extracts from Fructus Gardeniae led to analysis of its bioactive natural products. After infection by influenza virus strain A/FM/1/47-MA in vivo,antiviral activity of the extracts were investigated. The target fraction was orally administered to rats and blood was collected. High-performance liquid chromatography coupled with photo diode array detector and electrospray ion trap multiple-stage tandem mass spectrometry was applied to screen the compounds absorbed into the blood. A structural characterization based on the retention time, ultraviolet spectra, parent ions and fragmentation ions was performed. Thirteen compounds were confirmed or tentatively identified. This provides an accurate profile of the composition of bioactive compounds responsible for the anti-influenza properties.

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