2018年深圳市学校结核病临床分离株的MIRU-VNTR基因分型及传播特点分析

目的 应用可变数目串联重复序列(variable-number tandem repeat,VNTR)基因分型技术对学校结核病的流行情况进行监测,了解2018年深圳市学校结核病临床分离株的基因多态性及近期传播情况.方法 收集深圳市慢性病防治机构及定点医院学校结核病患者培养阳性菌株,提取基因组DNA,采用聚合酶链反应(p...     

胆酸-羟丙基-β-环糊精包合物的物相鉴别及体外鼻黏膜渗透评价

目的 通过羟丙基-β-环糊精包合胆酸,对包合物进行物相鉴别,提高胆酸的鼻黏膜渗透性.方法 采用相溶解度法、扫描电子显微镜法(SEM)、傅立叶变换红外光谱法(FT-IR)、差示扫描量热法(DSC)、核磁共振波谱法(NMR)对包合物进行物相鉴别;采用体外鼻黏膜渗透试验评价羟丙基-β-环糊精对胆酸鼻黏膜渗透性影响.结果 物相鉴别证明包合物形成,相溶解度曲线为AL型,包合常数K=564.30 L/mol;采用羊鼻黏膜进行渗透试验,胆酸-羟丙基-β-环糊精包合物的渗透系数和稳态流量分别为胆酸的1.46、144倍.结论 采用羟丙基-β-环糊精包合胆酸,形成了胆酸-羟丙基-β-环糊精包合物,并能提高胆酸鼻黏膜渗透性.     

基于CiteSpace可视化分析乳腺癌铁死亡的研究现状

目的 基于CiteSpace对乳腺癌与铁死亡相关研究进行文献可视化分析,探讨2016—2022年该领域的研究热点及发展趋势。方法 基于Web of Science核心数据库,利用CiteSpace分析软件对2016—2022年发表的乳腺癌铁死亡相关文献进行文献计量学统计及可视化分析,对发表文献年度、国家/地区、机构和关键词等进行可视化分析,并对关键词进行共现分析、聚类分析和主题演化分析。结果 共检索到278篇乳腺癌铁死亡相关文献,可视化分析结果显示,该领域发文量呈逐年上升趋势,中国是发文量最多的国家,中心性居于第2位,发文量最多的机构是中山大学,关键词聚类分析提示细胞死亡、氧化应激、光热疗法、基因表达、肿瘤微环境、免疫状态等是乳腺癌铁死亡的研究热点。结论 铁死亡在乳腺癌治疗方面有巨大潜力,通过铁诱导剂、联合治疗等寻求相关靶点,可为乳腺癌的治疗提供新策略。     

Characterization of Human Primary Chondrocytes of Osteoarthritic Cartilage at Varying Severity

Background  There is a difficulty in evaluating the in vivo functionality of individual chondrocytes, and there is much heterogeneity among cartilage affected by osteoarthritis (OA). In this study, in vitro cultured chondrocytes harvested from varying stages of degeneration were studied as a projective model to further understand the pathogenesis of osteoarthritis.

Methods  Cartilage of varying degeneration of end-stage OA was harvested, while cell yield and matrix glycosaminoglycan (GAG) content were measured. Cell morphology, proliferation, and gene expression of collagen type I, II, and X, aggrecan, matrix metalloproteinase 13 (MMP-13), and ADAMTS5 of the acquired chondrocytes were measured during subsequent in vitro culture.

Results  Both the number of cells and the GAG content increased with increasing severity of OA. Cell spreading area increased and gradually showed spindle-like morphology during in vitro culture. Gene expression of collagen type II, collagen type X as well as GAG decreased with severity of cartilage degeneration, while expression of collagen type I increased. Expression of MMP-13 increased with severity of cartilage degeneration, while expression of ADAMTS-5 remained stable. Expression of collagen type II, X, GAG, and MMP-13 substantially decreased with in vitro culture. Expression of collagen type I increased with in vitro cultures, while expression of ADAMTS 5 remained stable.

Conclusions  Expression of functional genes such as collagen type II and GAG decreased during severe degeneration of OA cartilage and in vitro dedifferentiation. Gene expression of collagen I and MMP-13 increased with severity of cartilage degeneration.