肾小球滤过率和蛋白尿预测心血管高危患者结局

<正>较低的肾小球滤过率(eGFR)和较高的尿白蛋白肌酐比值(ACR)与主要心血管复合终点相关,例如,对eGFR<30ml/min·1.73m2和非常高的尿ACR校正后风险比为2.53(95%CI:1.61～3.99)。然而,将有关eGFR和尿ACR的信息添加到危险再分类分析中,对分配至中危分类的患者比例并未带来有意义的     

Screening for breast cancer with MRI: recent experience from the Australian Capital Territory

The American Cancer Society now recommends annual MRI screening for women at 20–25% or greater lifetime risk of breast cancer. The role of MRI screening in other risk subgroups is unproved because of insufficient data. Our study comprised 209 breast MRI scans carried out in 171 asymptomatic patients (age range 22–67 years, mean 46 years), referred between January 2005 and June 2008. Targeted ultrasound was carried out in 32 episodes (15%) and biopsies were taken in 23 patients (13%). In four patients, MR‐guided procedures were required to establish a diagnosis, two using hook‐wire localization and two by means of vacuum‐assisted biopsy. Seven cancers were detected by MRI in the 171 patients, with a yield of 4.1%. Only one of the seven cancers was also shown by x‐ray mammography. Four patients had invasive ductal cancer (all axillary node negative) and three had high‐grade ductal carcinoma in situ or pleomorphic lobular carcinoma in situ. The three women with in situ disease were all potentially high risk, based on the National Breast and Ovarian Cancer Centre (NBOCC) criteria. Three women with invasive breast cancer were at only average risk based on NBOCC criteria, but two of these had extremely dense breasts. A fourth patient, found to have multifocal invasive cancer, had a personal history of contralateral breast cancer, but no relevant family history. Our findings suggest that breast MRI could be used to screen a larger Australian population at increased risk of developing breast cancer.     

抗肿瘤药物研究Ⅰ:去甲斑蝥素氨基酸衍生物的合成与抗癌活性

In order to search for new compounds with higher anti-cancer activities and lower toxicities, 19 amino acid derivatives of norcantharidin, of which 16 are unknown compounds, were designed and synthesized. Preliminary screening results revealed that 2-(syn-exo-7-oxabicyclo [2. 2. 1] heptane-2, 3-dicarboxylic imido)-N-phenyl glutaramic acid exhibited a fairly apparent inhibitory activity against human-hepatoma cells in vitro (inhibitory rate 39.4% at 0.025 μtmol/ml).     

苦参碱的人体药代动力学

建立了人血清苦参碱的高效液相色谱分析方法,此法回收率为99.1～102.2%,日内精密度RSD<4%,日间RSD<6%。血药浓度在1.25～40.0μg·mL^-1范围内呈线性关系(r=0.9997)。8名健康志愿者iv苦参碱6ms·kg^-1后,药代动力学过程符合二室模型。收集其中6名志愿者尿液,32h尿中原形药物排泄率为52.75%,肾清除率为143.79ml·min^-1。     

人参二醇皂甙和三醇皂甙对兔纹状体ATP酶的影响

本文报道用体外给药法,观察了PDS和PTS对纹状体ATP酶(Na⁺、K⁺-ATP酶,Ca²⁺-ATP酶及M²⁺-ATP酶)的影响。结果发现PDS和PTS对Na⁺,K⁺-ATP酶都有明显的抑制作用,且随PDS和PTS浓度的高低,其抑制作用增强或减弱;对Ca²⁺-ATP酶,PDS在10^-5g/ml时有激活作用,当浓度增高到10^-3g/mL时则转为抑制,而PTS仅为抑制效应;对于Mg²⁺-ATP酶能被PDS所兴奋,而被PTS所抑制。此结果表明PDS和PTS对中枢神经系统的作用,可能与其影响脑内ATP酶有密切的内在联系。     

Carcinogenic polycyclic aromatic hydrocarbons increase intracellular Ca2+ and cell proliferation in primary human mammary epithelial cells

Previous studies have shown that polycyclic aromatic hydrocarbons (PAHs) mobilize intracellular Ca2+ in human T cells by inositol trisphosphate-dependent mechanisms resulting from activation of phospholipase C-gamma by SRC-related protein tyrosine kinases, thereby mimicking antigen-receptor activation. Ca2+ appears to play an important second messenger role in growth factor control of cell proliferation in human mammary epithelial cells (HMEC), such as the epidermal growth factor receptor pathway. The purpose of the present studies was to determine if PAHs are able to increase intracellular Ca2+ in primary cultures of HMEC and increase cell proliferation. Two carcinogenic and two non-carcinogenic PAHs were tested for their ability to increase intracellular Ca2+ in HMEC. The carcinogenic PAHs dimethylbenz[a]anthracene (DMBA) and benzo[a] pyrene (BaP) were able to cause Ca2+ elevation in HMEC at early time points (2 h) and caused sustained alterations in Ca2+ homeostasis (18 h). DMBA showed maximal effects at early time points (2 h), while BaP showed maximal effects on sustained Ca2+ (18 h). 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD), a potent dioxin and tumor promoter, produced maximal Ca2+ elevation at 2 h, with a return to near baseline levels by 6 h. The non-carcinogenic PAHs benzo[e]pyrene and anthracene did not significantly alter intracellular Ca2+ at any time point. alpha-Naphthoflavone significantly reduced the Ca2+ response induced by BaP treatment, but not by DMBA or TCDD, suggesting that P450 1A or 1B metabolism of BaP may be important in the sustained Ca2+ elevating response. In evaluating the effects of BaP on HMEC proliferation, BaP was found to increase the number of cells recovered after 4 days in culture in the absence or presence of various concentrations of epidermal growth factor. These studies provide initial evidence that Ca2+ signaling may be associated with mitogenesis in HMEC, which may play a role in tumor promotion and progression produced by PAHs.