Low-temperature plasma(LTP)has shown great promise in wound healing,although the underlying mechanism remains poorly understood.In the present study,an argon atmospheric pressure plasma jet was employed to treat L929 ...Low-temperature plasma(LTP)has shown great promise in wound healing,although the underlying mechanism remains poorly understood.In the present study,an argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro and skin wounds in BALB/c mice.The in vitro analysis revealed that treatment of fibroblasts with LTP for 15 s resulted in a significant increase in cell proliferation,secretion of epidermal growth factor(EGF)and transforming growth factor-β1(TGF-β1),production of intracellular reactive oxygen species(ROS),and the percentage of cells in S phase,protein expression of phosphorylated p65(P-p65)and cyclin D1,but a noted decrease in the protein expression of inhibitor kappa B(IκB).The in vivo experiments demonstrated that 30-s LTP treatment enhanced the number of fibroblasts and the ability of collagen synthesis,while 50-s treatment led to the opposite outcomes.These results suggested that LTP treatment promotes the fibroblast proliferation in wound healing by inducing the generation of ROS,upregulating the expression of P-p65,downregulating the expression of IκB,and activating the NF-κB signaling pathway and consequently altering cell cycle progression(increased DNA synthesis in S phage).展开更多
An argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro.Experimental results showed that,compared with the control cells,the treatment of fibroblasts with 15 s of plasm...An argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro.Experimental results showed that,compared with the control cells,the treatment of fibroblasts with 15 s of plasma led to a significant increase of cell viability and collagen synthesis,while the treatment of 25 s plasma resulted in a remarkable decrease.Exploration of related mechanisms suggested that cold plasma could up-regulate Cyclin D1 gene expression and down-regulate p27 gene expression at a low dose,while it could down-regulate Cyclin D1 expression and up-regulate p27 expression at a higher dose,thus altering the cell cycle progression,and then affecting cell viability and collagen synthesis of fibroblasts.展开更多
目的通过对创伤性脑损伤(TBI)研究文献进行计量学分析,探索TBI领域的研究热点和研究趋势。方法基于Web of Science核心数据库检索2016~2020年TBI研究的相关文献,通过CiteSpace.5.8.R3对发表文章年度分布、作者、机构、国家、期刊、被引...目的通过对创伤性脑损伤(TBI)研究文献进行计量学分析,探索TBI领域的研究热点和研究趋势。方法基于Web of Science核心数据库检索2016~2020年TBI研究的相关文献,通过CiteSpace.5.8.R3对发表文章年度分布、作者、机构、国家、期刊、被引情况和关键词等进行分析,并根据关键词的词频、中心性和聚类情况探讨TBI领域的研究热点和趋势。结果(1)筛选后共纳入14991篇文献,美国是发文量最多的国家,哈佛大学医学院是发文量最多的机构。(2)氧化应激、死亡率、儿童TBI、创伤后应激障碍、康复治疗是近5年TBI领域研究热点。(3)TBI的模型及损伤效应-生物学机制-诊断及治疗指南-个体治疗是TBI研究领域的研究趋势。结论青少年人群TBI的损伤效应、分子机制、治疗方法的可靠性及有效性是TBI领域现在和未来研究的重点和方向。展开更多
Dielectric barrier corona discharge was developed to generate low-temperature plasma(LTP) to treat apple and spinach samples contaminated with omethoate. Experimental results showed that,after 20 min exposure, the deg...Dielectric barrier corona discharge was developed to generate low-temperature plasma(LTP) to treat apple and spinach samples contaminated with omethoate. Experimental results showed that,after 20 min exposure, the degradation rate of omethoate residue in apple and spinach was(94.55± 0.01)% and(95.55 ± 0.01)%, respectively. When the treatment time was shorter than 20 min,the contents of moisture, vitamin C and beta-carotene were not affected by LTP. Exploration of related mechanisms suggested that LTP might destroy unsaturated double bonds of omethoate and produce phosphate ion, eventually leading to omethoate destruction. It is concluded that appropriate dosage of LTP can effectively degrade omethoate residue in fruits and vegetables without affecting their quality.展开更多
基金supported by the National Natural Science Foundation of China(Nos.81372076,51677146,51521065 and 51307133)the Sci-Tech Project of Shaanxi Province(No.2010K16-04)
文摘Low-temperature plasma(LTP)has shown great promise in wound healing,although the underlying mechanism remains poorly understood.In the present study,an argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro and skin wounds in BALB/c mice.The in vitro analysis revealed that treatment of fibroblasts with LTP for 15 s resulted in a significant increase in cell proliferation,secretion of epidermal growth factor(EGF)and transforming growth factor-β1(TGF-β1),production of intracellular reactive oxygen species(ROS),and the percentage of cells in S phase,protein expression of phosphorylated p65(P-p65)and cyclin D1,but a noted decrease in the protein expression of inhibitor kappa B(IκB).The in vivo experiments demonstrated that 30-s LTP treatment enhanced the number of fibroblasts and the ability of collagen synthesis,while 50-s treatment led to the opposite outcomes.These results suggested that LTP treatment promotes the fibroblast proliferation in wound healing by inducing the generation of ROS,upregulating the expression of P-p65,downregulating the expression of IκB,and activating the NF-κB signaling pathway and consequently altering cell cycle progression(increased DNA synthesis in S phage).
基金supported partly by National Natural Science Foundation of China(Nos.81372076,51307133 and 51221005)China National Funds for Distinguished Young Scientists(No.51125029)+1 种基金the Sci-Tech Project of Shaanxi Province of China(No.2010K16-04)the Fundamental Research Funds for the Central Universities of China(No.xkjc2013004)
文摘An argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro.Experimental results showed that,compared with the control cells,the treatment of fibroblasts with 15 s of plasma led to a significant increase of cell viability and collagen synthesis,while the treatment of 25 s plasma resulted in a remarkable decrease.Exploration of related mechanisms suggested that cold plasma could up-regulate Cyclin D1 gene expression and down-regulate p27 gene expression at a low dose,while it could down-regulate Cyclin D1 expression and up-regulate p27 expression at a higher dose,thus altering the cell cycle progression,and then affecting cell viability and collagen synthesis of fibroblasts.
文摘目的通过对创伤性脑损伤(TBI)研究文献进行计量学分析,探索TBI领域的研究热点和研究趋势。方法基于Web of Science核心数据库检索2016~2020年TBI研究的相关文献,通过CiteSpace.5.8.R3对发表文章年度分布、作者、机构、国家、期刊、被引情况和关键词等进行分析,并根据关键词的词频、中心性和聚类情况探讨TBI领域的研究热点和趋势。结果(1)筛选后共纳入14991篇文献,美国是发文量最多的国家,哈佛大学医学院是发文量最多的机构。(2)氧化应激、死亡率、儿童TBI、创伤后应激障碍、康复治疗是近5年TBI领域研究热点。(3)TBI的模型及损伤效应-生物学机制-诊断及治疗指南-个体治疗是TBI研究领域的研究趋势。结论青少年人群TBI的损伤效应、分子机制、治疗方法的可靠性及有效性是TBI领域现在和未来研究的重点和方向。
基金supported in part by National Natural Science Foundation of China under Grant Nos. 81372076, 51677146, 51607003 and 51521065the Fundamental Research Funds for the Central Universities under Grant No. xkjc2013004
文摘Dielectric barrier corona discharge was developed to generate low-temperature plasma(LTP) to treat apple and spinach samples contaminated with omethoate. Experimental results showed that,after 20 min exposure, the degradation rate of omethoate residue in apple and spinach was(94.55± 0.01)% and(95.55 ± 0.01)%, respectively. When the treatment time was shorter than 20 min,the contents of moisture, vitamin C and beta-carotene were not affected by LTP. Exploration of related mechanisms suggested that LTP might destroy unsaturated double bonds of omethoate and produce phosphate ion, eventually leading to omethoate destruction. It is concluded that appropriate dosage of LTP can effectively degrade omethoate residue in fruits and vegetables without affecting their quality.
