AN-132 block of cardiac sodium channels: A gate-related receptor analysis

Summary Based on the gate-related receptor hypothesis, an analysis of kinetics of AN-132, a new antiarrhythmic agent, blockade of cardiac sodium channels and the gate-related receptor which is bound by the drug was performed by computer simulation. Model-predicted apparent rates of onset of AN-132 (30 μmol/L) blocking were 0.051, 0.038, and 0.034 AF⁻¹ at stimulation frequencies of 1.0, 2.0 and 3.0 Hz, respectively. The time constant of recovery from block by AN-132 at resting potential -90 mV was 39.5 s. These findings are in agreement with those experimental data documented. The analysis of gate-related receptor shows that AN-132 binds the inactivation gate-related receptor, and the binding and unbinding are modulated by the inactivation process.     

Compartmentation of cardiac adenine nucleotides and formation of adenosine

Summary After prelabeling the adenine nucleotides (ATP, ADP, AMP) of isolated perfused guinea pig hearts with either¹⁴C-adenine or¹⁴C-adenosine for 35 min, labeled adenosine, inosine, hypoxanthine and cyclic 35-AMP (cAMP) were continuously released into the cardiac perfusate. Determination of the specific activities (SA) of the adenine nucleotides, cAMP, and their breakdown products (adenosine, inosine, hypoxanthine) in tissue and perfusate revealed: Under steady state conditions the SA of adenosine and cAMP in the perfusate were of the same order of magnitude and proved to be many times higher than the SA of the respective precursor adenine nucleotides. This difference was observed regardless whether adenine or adenosine was used as prelabeling substance. The SA of inosine and hypoxanthine in the perfusate were constantly lower than the SA of adenosine. Cardiac ischemia of 6 min, which resulted in a markedly increased formation of adenosine, led to a pronounced decrease in the SA of adenosine released from the heart.Our findings provide evidence that at least two different adenine nucleotide compartments of the heart serve as precursors for the formation of adenosine and cAMP, one characterized by a high, the other by a lower SA. Under normoxic conditions adenosine and cAMP released into the cardiac perfusate are derived mainly from a nucleotide fraction of high SA, which appears to be rather small. During ischemia a second compartment of much lower SA in addition contributes to the formation of adenosine.A preliminary report of part of this work appeared in Biochemistry and Pharmacology of Myocardial Hypertrophy, Hypoxia and Infarction Vol. 7 of Recent advances in studies on cardiac structure and metabolism. (P. Harris, R. J. Bing, A. Fleckenstein, eds.), pp. 171–175. München: Urban & Schwarzenberg 1976A preliminary report of part of this work appeared in Biochemistry and Pharmacology of Myocardial Hypertrophy, Hypoxia and Infarction Vol. 7 of Recent advances in studies on cardiac structure and metabolism. (P. Harris, R. J. Bing, A. Fleckenstein, eds.), pp. 171–175. München: Urban & Schwarzenberg 1976     

miR-152-3p靶向IGF1基因对高糖诱导的ARPE-19细胞活性和凋亡的影响

目的：探究microRNA-152-3p(miR-152-3p)靶向胰岛素样生长因子1(IGF1)基因对高糖诱导的视网膜色素上皮ARPE-19细胞活性和凋亡的影响,并探讨其作用机制。

方法：高糖诱导ARPE-19细胞并转染miR-152-3p mimics,噻唑蓝(MTT)法检测细胞增殖活性,流式细胞术检测细胞凋亡情况,荧光定量PCR(RT-PCR)检测细胞中miR-152-3p水平,蛋白印迹(Western blot)法检测细胞中IGF1和VEGF表达水平,双荧光素酶报告基因检测IGF1和miR-152-3p靶向结合关系。

结果：高糖能够降低ARPE-19细胞活性,提高细胞凋亡率,抑制细胞中miR-152-3p的表达,提高IGF1和VEGF的表达; 而过表达miR-152-3p能够回调高糖诱导的细胞活性抑制及凋亡增加,抑制IGF1和VEGF的表达。双荧光素酶报告基因实验验证了IGF1是miR-152-3p的靶基因。

结论：miR-152-3p可通过靶向IGF1基因调节VEGF的表达抑制高糖诱导的ARPE-19细胞活性抑制和凋亡增加。     

Local Leaders' Perspectives on Women Veterans’ Health Care: What Would Ideal Look Like?

Background

The Veterans Health Administration (VHA) faces challenges in providing comprehensive, gender-sensitive care for women. National policies have led to important advancements, but local leadership also plays a vital role in implementing changes and operationalizing national priorities. In this article, we explore the notions of ideal women veterans' health care articulated by women's health leaders at local VHA facilities and regional networks, with the goal of identifying elements that could inform practice and policy.

基因间长链非编码RNA152靶向微小RNA?103a?3p对非小细胞肺癌细胞增殖和侵袭迁移的影响

目的探讨基因间长链非编码RNA 152(LINC00152)靶向调控微小RNA-103a-3p(miR-103a-3p)表达及对非小细胞肺癌(NSCLC)细胞增殖和侵袭迁移的影响。方法采用实时定量PCR(QPCR)检测正常肺上皮细胞BEAS-2B及NSCLC细胞(ANIP-973、NCI-H157、A549和NCI-H1975)的LINC00152水平。选取LINC00152水平最高的细胞分别转染LINC00152特异性小干扰RNA(si-LINC00152组)或无关序列(si-NC组),另设未转染细胞为对照组。QPCR检测LINC00152水平,活细胞计数CCK-8法、Transwell小室和划痕实验测定细胞增殖、侵袭和迁移能力,Western blotting检测基质金属蛋白酶(MMP)-2、MMP-9和第10号染色体缺失的磷酸酶及张力蛋白同源基因(PTEN)的水平;荧光素酶报告实验验证LINC00152靶向结合miR-103a-3p的能力。结果NSCLC细胞的LINC00152水平均高于BEAS-2B细胞(P<0.05),尤其是NCI-H1975细胞的最高。si-LINC00152组的LINC00152水平为0.352±0.087,低于对照组的1.058±0.219和si-NC组的1.126±0.139(P<0.05)。与si-NC组和对照组相比,si-LINC00152组NCI-H1975细胞转染48、72 h的增殖活力下降(P<0.05);si-LINC00152组的划痕愈合率和穿膜细胞数分别为(27.386±2.428)%和(78.840±5.031)个,低于si-NC组的(77.675±4.803)%和(179.208±13.264)个及对照组的(76.371±5.385)%和(174.003±15.678)个(P<0.05);与si-NC组和对照组相比,si-LINC00152组的MMP-2和MMP-9水平均降低,而PTEN水平升高(P<0.05)。对照组和si-NC组上述指标的差异无统计学意义(P>0.05)。双荧光素酶报告分析证实,miR-103a-3p模拟物降低了野生型LINC00152的荧光素酶活性(P<0.05),但对突变型无影响(P>0.05)。结论LINC00152在NSCLC细胞中高表达并发挥促癌作用,与NSCLC的迁移侵袭密切相关,LINC00152与miR-103a-3p间的相互作用在NSCLC靶向治疗中有一定潜能。     

miR-152在非小细胞肺癌患者血清中的表达及临床意义

目的 通过检测非小细胞肺癌(NSCLC)患者血清中microRNA-152 (miR-152)的水平,探讨其与NSCLC的关系.方法 采用Real time-PCR法检测61例NSCLC患者和80例健康对照者血清miR-152的表达水平,并分析其与临床病理指标间的关系.结果 NSCLC组血清miR-152的表达水平显著降低(P＜0.01).且其表达量与患者吸烟史和TNM分期有关,有吸烟史的NSCLC晚期的患者表达更低(P＜0.05),而在不同年龄、性别、组织学类型、肿瘤分化间差异无统计学意义(P＞0.05).根据miR-152的表达水平绘制ROC曲线,曲线下面积为0.820(95％CI=0.752～0.889),临界值取0.48时,灵敏度和特异度分别为63.80％和90.20％.结论 NSCLC患者血清中miR-152表达低,且与肿瘤分化程度相关,miR-152可能作为NSCLC诊断的特异肿瘤标志物.     

A misdiagnosis of carotid pseudoaneurysm

We report a case of blunt injury of the neck associated with the use of an imported plastic rock-guard designed for use in motorcycle scrambling. The injury may have important implications for the future use of this particular guard.     

过敏性紫癜患儿外周血单个核细胞共刺激分子的表达及意义

目的探讨共刺激分子的表达与过敏性紫癜(HSP)的关系。方法以本院肾脏免疫科住院治疗的31例初发HSP患儿和14例健康儿童为研究对象,病例采血前均无用药史、急性感染性疾病史及其他合并症;采用流式细胞仪直接计数法测定HSP患儿和健康对照组儿童外周血CD4、CD8、CD28、CD152、CD80和CD86的表达;2组间差异比较采用SPSS12.0软件进行处理。结果HSP组外周血单个核细胞表面CD4、CD8、CD80、CD86、CD28和CD152的表达分别为(40.56±3.23)%、(30.61±4.21)%、(6.92±2.31)%、(12.43±4.16)%、(60.38±10.12)%和(0.52±0.47)%,健康对照组CD4、CD8、CD80、CD86、CD28和CD152的表达分别为(41.96±4.46)%、(30.60±4.42)、(2.51±1.67)%、(2.34±1.43)%、(47.62±7.63)%和(0.45±0.14)%;HSP组外周血单个核细胞表面CD4、CD8和CD152的表达与健康对照组比较均无显著性差异;HSP组外周血单个核细胞表面CD80、CD86和CD28的表达显著高于健康对照组。紫癜性肾炎组外周血单个核细胞表面CD4、CD8、CD80、CD86、CD28和CD152的表达分别为(41.55±2.11)%、(31.55±3.17)%、(6.56±2.22)%、(11.91±4.52)%、(59.79±8.92)%和(0.46±0.31)%,非紫癜性肾炎组CD4、CD8、CD80、CD86、CD28和CD152的表达分别为(40.07±2.83)%、(29.52±3.58)%、(7.09±2.48)%、(12.68±3.55)%、(61.33±10.21)%和(0.58±0.40)%,2组比较均无显著性差异。结论外周血单个核细胞抑制性共刺激分子CD152的表达相对降低,不能抑制刺激性共刺激分子CD28的作用,导致免疫细胞过度活化可能是促进HSP发生的因素之一,外周血单个核细胞共刺激分子的表达异常参与紫癜性肾炎的发生。     

特发性多发性肌炎外周血淋巴细胞共刺激分子表达的研究

目的观察特发性多发性肌炎患者外周血淋巴细胞共刺激分子CD28、CD152、CD80、CD86表达,进一步分析共刺激分子与疾病的关系。方法研究分三组,即健康对照者（HC,n=5）、特发性多发性肌炎组（IPM,n=8）和肌营养不良组（MD,n=8）,后两组患者均经肌肉活检酶组织化学确诊。三组患者均通过流式细胞术检测外周血淋巴细胞CD4、CD8、CD4＋CD28＋、CD8＋CD28＋、CD152、CD80、CD86表达,并计算出CD4＋CD28-、CD8＋CD28-表达。结果与HC组比较,IPM组CD4＋CD28＋表达降低（31.9±6.6 vs 39.5±6.9,P〈0.05）,其所占CD4＋T细胞的百分率亦明显下降（92.2%±6.2% vs 98.1%±0.7%,P〈0.05）,与之相反的是CD4＋CD28-表达明显升高（2.0±1.8 vs 0.6±0.2,P〈0.05）。IPM组CD4、CD8表达及CD8＋CD28＋/CD8百分比与HC组无明显差异,CD8＋CD28-表达则呈上升趋势。IPM组CD152较HC组明显升高（18.5±13.8 vs 7.1±1.2,P〈0.05）,各组间CD80表达无明显差异,CD86以IPM组最高（6.8±1.9 vs 4.6±1.7,P〈0.05）。结论IPM患者外周血CD4阳性的T细胞表面的CD28表达下降,但CD152和CD86表达升高。