人膀胱癌T24细胞及其SCID小鼠移植瘤组织中KDR的表达

目的 检测KDR在人膀胱癌T24细胞及其SCID小鼠移植瘤组织中的表达。方法 常规培养T24细胞，建立荷人膀胱癌移植瘤SCID小鼠动物模型，使用抗KDR单克隆抗体，通过免疫荧光、免疫组化检测KDR在T24细胞及瘤体组织上的表达；结果 KDR在T24细胞及瘤体组织中均呈阳性表达。结论 本研究结果为进一步研究抗KDR单抗在荷T24细胞移植瘤动物体内分布及对瘤体生长的抑制效应奠定了实验基础。     

体表电位标测微机系统(Ⅰ型)

本系统的107个电极中,103个分布于胸、背部,1个为参考电极,1个为V_3,其余用于肢导。本系统除能绘出2、4、8ms任意间隔的103通道同步的体表等电位图,常规12导联和V_(7 9)心电图,胸、背部位的心电图外,还可记录R峰值等电位图,∑R,Q波等电位图,nQ30、40,极大、极小轨迹图等。     

食管癌3p24等位基因LOH及其扩增产物克隆的研究

目的；研究3p24EAβMD位点与食管癌的关系。为寻找该位点附近可能存在的抑癌基因奠定基础。方法：采用PCR—RFLP法检测45例食管癌患者3p24位点杂合缺失情况。并对该片段进行克隆。结果：在22例食管癌信息个体中共检出9例杂合缺失。并通过序列分析可知变化为点突变。结论：3p24EAβMD较高的杂合缺失率显示该位点附近可能存在潜在的抑癌基因。     

CD24 expression on human keratinocytes

Abstract: CD24 or Nectadrin is a cell surface glycoprotein expressed in pre-B lymphocytes, T lymphocytes, neurons, muscle cells and carcinoma cells. Its function is not completely known, but it has been suggested that it is involved in cell adhesion and signalling. CD24 has recently been identified as the human molecule homologous to the murine heat-stable antigen (HSA). HSA is expressed by murine keratinocytes and delivers costimulatory signals in T-cell activation. Long-term cultures of normal human keratinocytes (HKC) were obtained from skin of human female breast sections and either left untreated or were treated with phorbol-12-myristate-13-acetate (PMA) at 10–100 ng/ml, calcium 0.5–2 mM or IFN-γ 100–1000 U/ml, for 24–48 h. Using RT-PCR and flow cytometry we showed that HKC express low levels of CD24 even under basal conditions, and the treatment with calcium, PMA or IFN-γ increased levels of CD24 mRNA and protein. To the best of our knowledge, this is the first report to measure CD24 expression and production by cultured HKC in basal conditions and after stimulation. Further studies are needed to determine biological and therapeutical relevance of these findings.     

Detection of HLA-A*24 null alleles by DNA typing methods

Abstract: A number of cases have been identified (seven unrelated individuals from the Northern Ireland bone marrow donor registry and two family groups) where an HLA-A*24 allele fails to express the normal HLA-A24 antigen. Family information has revealed common haplotypes with respect to each non-expressed allele indicating that the occurrence of these mutations has been a recent event. Two methods for the clinical typing of these alleles have been evaluated - PCR-SSOP and PCR-SSCP analysis.     

辅酶Q10对大鼠阿霉素心脏毒性的保护作用

目的：研究辅酶Q10（CoQ10）对大鼠阿霉素心脏毒性的保护作用，并探讨可能的机理。方法：采用离体心脏灌流方法，实验分3组：对照组、阿霉素组、CoQ10组，监测大鼠心肌收缩幅度、冠脉流量、心电图的变化，并测定冠脉流出液肌酸磷酸激酶（CPK）活力和大鼠心肌丙二醛含量、超氧化物歧化酶、谷胱甘肽过氧化物酶（GSH-Px）活力以及电镜下超微结构的改变。结果：CoQ10可改善阿霉素引起的大鼠心肌收缩幅度、冠脉流量下降，减少心律失常的发生，降低冠脉流出液CPK活力；CoQ10组心肌丙二醛含量明显低于阿霉素组、SOD和GSH-Px活力高于阿霉素组，电镜下超微结构变化亦优于阿霉素组。结论：CoQ10对阿霉素引起的心脏毒性具有保护作用，其机理可能与CoQ10拮抗阿霉素的氧自由基损伤有关。     

Ambulatory 24-hour esophageal pH monitoring

If 24-hour esophageal pH monitoring is to be a useful diagnostic tool, it must reliably discriminate gastroesophageal reflux patients despite daily variations in distal esophageal acid exposure. To address this issue, we studied 53 subjects (14 healthy normals, 14 esophagitis patients, and 25 patients with atypical symptoms) with two ambulatory pH tests performed within 10 days of each other. Intrasubject reproducibility of 12 pH parameters to discriminate the presence of abnormal acid reflux was determined. As a group, the parameters of percent time with pH<4 (total, upright, recumbent) were most reproducible (80%). Therefore, a subject was defined as having gastroesophageal reflux disease if at least one of these three values were abnormal. Intrasubject reproducibility for the diagnosis of reflux disease was 89% for the entire sample. Among subsets, the reproducibility was 93% for the normals and esophagitis patients and 84% for the atypical symptom patients. Total percent time with pH<4 was the single most discriminate pH parameter (85%) and nearly equaled that of the three combined parameters (89%). The intrasubject variability of this parameter was determined by the mean ±2sd of the relative differences between the two test results for all 53 subjects. Total percent time with pH<4 may vary between tests by a factor of 3.2-fold or less (218% higher to 69% lower). We conclude: (1) ambulatory 24-hr esophageal monitoring is a reproducible test for the diagnosis of gastroesophageal reflux disease; and (2) the large intrastudy variability in 24-hr total acid exposure may limit this test's usefulness as a measurement of therapeutic improvement.Supported, in part, by Public Health Services Grant AM 34200-01A1 from NIADDIK.     

儿童虐待史问卷的信度效度分析

目的引入儿童虐待史问卷(CECA.Q),并对它进行初步的信度、效度分析.方法对308例某一社区人群和60例抑郁症患者人群进行了CECA.Q测试,分析CECA.Q的内部一致性,重测信度,内容及校标效度.结果 CECA.Q的精神虐待部分的Cronbach's α系数为0.97(其中母亲为0.96,父亲为 0.94),其中憎恶因子为0.93(其中母亲为0.90,父亲为0.88),忽视因子为0.97(其中母亲0.96,父亲 0.95).精神虐待的重测信度0.82(其中母亲0.80,父亲0.83),其中憎恶因子为0.80(其中母亲为0.80,父亲为 0.67),忽视因子为0.78(其中母亲0.75,父亲0.77);躯体及性虐待的两次测评的一致性好(Kappa值为 0.78).精神虐待分值与抑郁自评量表 (SDS)分值正相关(r=0.61,P ＜0.01),CECA.Q与儿童虐待史晤谈评定提纲(CECA)评定躯体及性虐待史的一致性好(Kappa值为0.87),抑郁症患者的精神虐待分值高于社区人群的精神虐待分值(P ＜0.05).结论儿童虐待史问卷具有较好的信、效度,在我国也可作为回顾性儿童虐待史筛选调查的自评工具.