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Ling Chen,Cheng-Zhi Zhan,Tao Wang,Hua You,Rui Yao 연세대학교의과대학 2020 Yonsei medical journal Vol.61 No.1
Purpose: Curcumin exerts its anti-cancer effects, partly by targeting special microRNAs, in human cancers. MiR-21 is a key oncomirin carcinogenesis of multiple human cancers. Here, we aimed to further explore the mechanistic insight into the link betweencurcumin and miR-21 on diffuse large B-cell lymphoma (DLBCL). Materials and Methods: Quantitative real-time PCR assays were performed to assess the levels of miR-21 and Von Hippel-Lindau(VHL) mRNA. In situ hybridization assay was used for miR-21 expression visualization in lymphoma tissues. Western blot was usedfor determination of VHL protein, Ki-67, caspase-3, and cleaved caspase-3 levels. Dual-luciferase reporter assay and RNA immunoprecipitationassay were employed to confirm the direct target of miR-21. MTT assay, flow cytometric analysis, and transwell assaywere used to evaluate cell proliferation, apoptosis, and migration and invasion capacities, respectively. Results: Curcumin repressed the proliferation, migration, and invasion abilities and promoted apoptosis in SU-DHL-8 cells. Curcumininhibited miR-21 expression and curcumin exerted its anti-proliferation, anti-migration, anti-invasion, and pro-apoptosiseffects by miR-21 in SU-DHL-8 cells. VHL was a direct target of miR-21. Moreover, curcumin exerted its regulatory effects on SUDHL-8 cells by VHL. Conclusion: Curcumin exerted its anti-proliferation, anti-migration, anti-invasion, and pro-apoptosis functions, at least partly, byrepressing miR-21 and regulating VHL expression in DLBCL cell line. Our findings provided a possible molecular mechanism ofcurcumin-mediated anti-cancer effect.
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Ting-Ting Qi,Ping-Zhan Si,Fang Cheng,Zhi-Rui Wang,Hong-Liang Ge,Qiong Wu,Jihoon Park,Chul-Jin Choi 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
Cubic perovskite-type Mn4C is difficult to prepare for its metastable characteristics. In this work, we have obtained high-purity Mn4C successfully by using melt-spinning method. The effects of stoichiometry on the structure and magnetic properties of the samples were studied systematically. We found that x = -0.1 is the optimum composition for the formation of the cubic perovskite phase in Mn4+xC during rapid quenching. Most Mn4+xC melt-spun ribbons with x other than -0.1 are composed of Mn23C6, α-Mn, and Mn4C, while the fraction of different phase in Mn4+xC ribbons varies with x. The Curie temperature of Mn4+xC ribbons increases slightly with decreasing x, which may affect the lattice parameters of cubic Mn4C and thus the Mn-Mn exchange interactions. The magnetization of Mn4+xC (x = -0.1 and 0) increases with increasing temperature in high-temperature region while the onset temperature for such behavior is dependent on the fraction of Mn4C in the samples.
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Pei-Rong Wu,Yu-Mei Feng,Ting Ge,Ying-Chao Kong,Zhan-Sheng Ma,Zan Liu,Zhi-Lin Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
The surface of self-made MoS2 nanosheets with five-layer structure was successively decorated by zinc borate (ZB) nanoparticles with coordination enhancement on the tribological performance and modified by three types of modifiers for improving dispersivity in oil. A series of characterizations determined the chemical modification and composite structure of the ZB/MoS2 nanocomposites. The tribological properties of the chemically capped ZB/MoS2 nanocomposites were extensively examined on a ball-on-ball wear tester. The average friction coefficient and average wear scar diameter of the OA-ZB/MoS2-based oil dropped by about 25.2% and 52.2%, and furthermore the extreme pressure performance increased by about 15.2% compared to oil.
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