Dual-mode US/MRI nanoparticles delivering siRNA and Pt(iv) for ovarian cancer treatment

As known to all, ovarian cancer ranks the most lethal of the gynecological malignancies. The antitumor drugs based on platinum are first-line chemotherapy drugs for ovarian cancer. However, their therapeutic efficiency is severely limited owing to dose-limiting toxicities of platinum. New theranostic strategies to overcome chemotherapy toxicity is highly desirable. Meanwhile, the real-time treating effect is not visible for doctors. Herein, we constructed PFH/siRNA/Fe₃O₄@Pt(iv) NPs-cRGD (NPs-cRGD) for precise theranostics against ovarian tumors with real-time imaging. The NPs-cRGD had a good storage stability and resisted the serum-induced aggregation, which was beneficial for drug delivery. Additionally, gel-retardation assay demonstrated that the NPs-cRGD exhibited great protection to siRNA to resist nuclease degradation. In vitro, the NPs-cRGD showed good dual-mode US/MRI imaging and the relative imaging research was also discussed. Moreover, the in vitro experiments indicated that the NPs-cRGD with US exhibited excellent antitumor therapeutic efficiency, resulting from the cRGD ligands and US exposure enhanced the cellular uptake efficiency. Thus, the dual-mode nanoparticles in this work may provide precious insight into the development of various multi-mode nanoplatforms delivering drugs or genes for precise theranostics against various cancer.

Phase-shifted dual-mode US/MRI nanoparticles (PFH/siRNA/Fe₃O₄@Pt(iv) NPs-cRGD) delivering si-survivin and Pt(iv) prodrug for enhancing ovarian cancer treatment and realizing real-time monitoring.     

Polyurethane-based bionic material simulating the Vis-NIR spectrum and thermal infrared properties of vegetation

Poor stability, the toxicity of the used colorants and complex structure are the main problems for the current spectral simulation materials for vegetation. In this paper, a lightweight (0.052 g cm⁻³) and environmentally friendly bionic porous spectrum simulation material (BPSSM) was developed to simulate the Vis-NIR spectra of natural leaves. The porous structure of BPSSM was used to simulate the mesophyll tissue, which endows the BPSSM with a near-infrared plateau. Moreover, the relationship between pore structure (size, open porosity and volume density) and near-infrared plateau in the spectrum was also studied. The chlorophyll of leaves was simulated by vat dyes or organic pigments, and the green apex and red edge characteristics in the visible region were further adjusted by the chlorophyllin sodium copper salt. The water absorption of BPSSM with 100–120% water contents are consistent with the natural leaves spectral curve channel. Finally, the spectral correlation coefficients (r_m) between BPSSM and different natural leaves are up to 0.984, suggesting that the BPSSM is universally applicable for the simulation of different leaves. Interestingly, the average radiant temperature difference between BPSSM and natural leaves is 0.25 °C within 24 hours, indicating it has similar thermal infrared properties to natural leaves. Moreover, the BPSSM can be combined with textiles to obtain a composite fabric, and its breaking strength and photostability were explored.

Simulation of near-infrared and thermal infrared characteristics of leaves.     

左房时相功能诊断冠状动脉粥样硬化性心脏病患者左室舒张功能障碍的价值

目的 应用二维斑点追踪（2D-STI）技术评价冠状动脉粥样硬化性心脏病（CHD）患者左房时相功能,探讨其对左室舒张功能障碍（LVDD）的诊断价值。方法 将89例左室射血分数（LVEF）≥50%的CHD患者分为左室舒张功能正常者38例（正常组）和LVDD者51例（LVDD组）,应用实时三维超声心动图测量心脏结构及功能参数,2D-STI测量左房储存应变（LASr）、左房通道应变（LAScd）、左房收缩应变及左房容积指数,比较两组上述参数的差异。采用二元Logistic回归分析筛选发生LVDD的独立影响因素;绘制受试者工作特征（ROC）曲线评估各参数诊断LVDD的效能。结果 正常组与LVDD组室间隔侧和左室侧壁二尖瓣环舒张早期运动速度、左房容积指数、二尖瓣舒张早期峰值流速与二尖瓣环早期运动速度比值、LASr、LAScd比较,差异均有统计学意义（均P<0.05）。二元Logistic回归分析显示,LASr、LAScd为CHD患者发生LVDD的独立影响因素（OR=0.668、0.670,均P<0.001）。ROC曲线分析显示,LASr诊断LVDD的曲线下面积为0.928(95%可信区...     

国家药品标准物质保障供应综合数据平台建设

目的：进一步提高国家药品标准物质供应保障的能力和水平,更好支撑药品监管需求和服务行业发展。方法：将信息化管理和分析方法与现有的标准物质管理技术要求相结合,研究建立数字化、可视化的数据共享系统。结果：建成的国家药品标准物质保障供应综合数据平台,可显示各品种的研制生产阶段和效率。结论：该平台试运行一年来已成为指导研制、生产和管理的有力抓手,为对接国际标准ISO 17034奠定了重要基础。     

Comparative study on main compounds in Ginkgo biloba L. base on mathematical statistics

In this paper, an HPLC-DAD-ELSD method was developed to determine main 20 components of Ginkgo bilobaL. leaves from different ages and sources, including six flavonol glycosides, five terpene lactones and nine organic acids. Using statistics method and establishing relevant mathematics models, the measured data has proceeded correlation analysis, principal component analysis, and regression statistics and the results showed generalityand specific characteristics. We defined p-hydroxybenzoicacid, catechinic, KRcG and ginkgolide A as characteristic indexes representing commonnessand specialityof Ginkgo biloba L. leaf. The four characteristic indexes can reflect the quality of Ginkgo biloba L. leaf, and the internal relations between them are significant.The contents of other compounds could define the quantity relation with characteristic markers. It simplified the approach of quality control, and provided a basis for quality control of Ginkgo biloba L.     

右美托咪定对高氧诱导急性肺损伤小鼠的保护作用及Nrf2/HO-1通路的影响

摘 要 目的：探讨右美托咪定对高氧诱导急性肺损伤小鼠的保护作用及核转录因子红细胞系2p45相关因子2（Nrf2）/血红素加氧酶 1（HO-1）通路的影响。 方法: 将100只C57BL/6小鼠随机分为5组：正常对照组、模型组、地塞米松组（100 mg·kg-1）、右美托咪定低（40 mg·kg-1）、高（80 mg·kg-1）剂量组。除正常对照组外,其余各组建立高氧诱导急性肺损伤模型,并于造模成功后腹腔注射相应药物,正常对照组和模型组给予等体积生理盐水,qd,持续7 d。实验结束后,检测小鼠肺/体比值、肺损伤评分、血氧分压（PaO2）,小鼠肺组织中Nrf2、HO-1 mRNA及蛋白表达水平,胱天蛋白酶 1（caspase 1）、白细胞介素 1β（IL 1β）、白细胞介素 18（IL 18 ）蛋白水平。制作肺部HE染色切片,观察肺损伤情况。 结果: 与正常对照组比较,模型组肺/体比值、肺损伤评分、Nrf2 mRNA及蛋白表达水平、IL 1β、IL 18、caspase 1蛋白表达水平明显升高,PaO2、HO-1 mRNA及蛋白表达水平明显降低（P<0.05）;与模型组比较,右美托咪定组肺/体比值、肺损伤评分、Nrf2 mRNA及蛋白表达水平、IL 1β、IL 18、caspase 1蛋白表达水平明显降低,PaO2、HO-1 mRNA及蛋白表达水平明显升高（P<0.05）,且呈剂量相关性;右美托咪定低剂量组与地塞米松组比较差异有统计学意义（P<0.05）。正常对照组肺泡组织结构正常,无炎症细胞浸润、无胶原蛋白沉淀;模型组、右美托咪定低剂量组肺泡壁明显增厚、破裂,可见中性细胞及少量嗜酸性细胞浸润,肺间质可见较多胶原蛋白沉淀;右美托咪定高剂量组及地塞米松组肺泡结构基本正常,有少量中性细胞侵润,几乎无胶原蛋白沉淀。 结论: 右美托咪定对高氧诱导急性肺损伤小鼠的保护作用与抑制Nrf2 mRNA及蛋白表达水平表达,进而抑制IL 1β、IL 18、caspase 1蛋白表达有关。     

基于AMPK/Sirt1通路延龄草总皂苷对脑缺血再灌注继发肺损伤大鼠的保护作用

摘 要 目的：探讨延龄草总皂苷（TST）对脑缺血再灌注大鼠肺组织的影响及其可能机制。 方法: 选取80只雄性大鼠随机分为8组：假手术组、模型组、阳性对照组（尼莫地平,200 mg·kg-1）、TST低（50 mg·kg-1）、中（100 mg·kg-1）、高（200 mg·kg-1）剂量组、腺苷酸活化蛋白激酶（AMPK）/沉默信息调节因子1（Sirt1）通路抑制剂组(1 mg·kg-1)、TST+AMPK/Sirt1通路抑制剂组(200 mg·kg-1+1 mg·kg-1),每组10只。苏木精 伊红（HE）染色检测大鼠肺组织病理变化;检测各组大鼠氧分压（PaO2）;酶联免疫吸附（ELISA）法检测各组大鼠支气管肺泡灌洗液中炎性因子水平;检测各组大鼠肺组织氧化应激水平。蛋白免疫印迹（Western blot）法检测肺组织AMPK、磷酸化AMPK（p AMPK）、Sirt1蛋白表达水平。 结果: 模型组大鼠肺损伤评分较假手术组高,而阳性对照组与TST不同剂量组均较模型组低（P＜0.05）;模型组大鼠PaO2、氧合指数（OI）、超氧化物歧化酶（SOD）、p AMPK及Sirt1蛋白表达水平均较假手术组低,而阳性对照组与TST组（高剂量）较模型组高,AMPK/Sirt1通路抑制剂组与TST+AMPK/Sirt1通路抑制剂组较TST组低,AMPK/Sirt1通路抑制剂组较TST+AMPK/Sirt1通路抑制剂组低（P＜0.05）;模型组IL-18、IL-1β、TNF-α、IL 6、肺组织湿干质量比、MDA、ROS、Ac NF κB p65蛋白表达水平均较假手术组高,而阳性对照组与TST组（高剂量组）较模型组低,AMPK/Sirt1通路抑制剂组与TST+AMPK/Sirt1通路抑制剂组较TST组高,AMPK/Sirt1通路抑制剂组较TST+AMPK/Sirt1通路抑制剂组高（P＜0.05）;阳性对照组与TST组比较差异均无统计学意义（P＞0.05）。 结论: TST可通过激活AMPK/Sirt1通路并减轻肺组织炎性反应及氧化应激反应进而减缓脑缺血再灌注继发肺损伤。