用非同位素原位杂交组化在光镜和电镜水平观察前阿黑皮素mRNA在垂体的分布

用地高辛标记反意前阿黑皮素(pro-opiomelanocortin,POMC)cRNA探针原位杂交组化在光镜和电镜水平观察了POMC mRNA在大鼠垂体的分布,并比较了碱性磷酸酶(AKP)显色系统和辣根过氧化酶(HRP)显色系统在光镜水平上的敏感性.结果:POMC mRNA广泛地分布于垂体的中间叶和前叶.中间叶全部细胞均为POMC mRNA阳性.前叶中除前叶的腹侧缘和前叶与中间叶交界处阳性细胞较少外,都有较多的POMC mRNA阳性细胞分布.AKP显色系统比HRP显色系统敏感.在电镜水平,POMC mRNA主要分布于粗面内质网,少数分泌颗粒可能呈阳性反应,胞核未见阳性反应沉淀.文内还就阳性分泌颗粒在调节细胞合成功能方面可能起的作用进行了讨论.     

Design and Simulation of Active Biochip System

To solve the problems existing in passive biochip systems, we designed a novel active biochip system. This system introduces negative pressure and controlling devices to adjust the antigen-antibody reaction on the nitrocellulose membrane. Computational simulation demonstrated that this system is a rapid, stable, robust and practical system that may enhance the efficiency of antigen-antibody reactions and improve the repeatability and accuracy of biochip analysis.     

The prevalence of dementia and Alzheimer's disease in Shanghai, China: impact of age, gender, and education

We report the prevalence rates for dementia and Alzheimer's disease (AD) obtained from a probability sample survey of 5,055 noninstitutionalized older persons in Shanghai, China. A two-stage procedure was used for case finding and case identification. A Chinese version of the Mini-Mental State Examination was used to determine cases of possible dementia. Three different cutoff points on this mental status test were used depending on the respondent's level of education. Clinical evaluations, based on functional assessments and psychiatric interview, medical and neurological examinations, three standardized mental status tests, and a selected group of psychometric tests, were made in the second stage of the study to ascertain the clinical diagnosis of dementia and AD utilizing the Diagnostic and Statistical Manual for Mental Disorders, edition 3 and National Institute of Neurological and Communicative Disorders and Stroke-Alzheimer's Disease and Related Disorders Association criteria, respectively. The prevalence rate of dementia in persons 65 years and older was 4.6%. Clinically diagnosed AD accounted for 65% of the subjects with dementia. These findings indicate that the prevalence of dementia in Shanghai is very much higher than figures published earlier for China and Japan, and at the lower part of the range of values reported for community residents in the United States and other Western countries, but less than half of that reported in the recently published survey of the elderly in East Boston. Increasing age, gender (female), and low education are each highly significant and independent risk factors for dementia. One hypothesis to explain the increased prevalence in elderly women who had received no formal education invokes the possibility of an effect of early deprivation, perhaps lowering brain "reserve," allowing the symptoms of dementia to appear at an earlier date during disease progression.     

大肠癌新相关基因HSU17714的染色体定位研究

目的确定大肠癌新相关基因ＨＳＵ１７７１４的染色体定位。方法采用强化荧光原位杂交技术（ＦＩＳＨ）,以生物素化酪胺强化荧光原位杂交信号。结果８０．０％（１２８／１６０）的间期细胞和５９．８％（１０４／１７４）的中期分裂相可见到明显集中的ＨＳＵ１７７１４基因的杂交信号,相应荧光Ｒ带分析中,８５．１％（４０／４７）在２２号染色体上１区３带处有杂交信号。结论ＨＳＵ１７７１４基因定位于２２ｑ１３。     

Dietary flavonoids, quercetin, luteolin and genistein, reduce oxidative DNA damage and lipid peroxidation and quench free radicals

Several dietary flavonoids such as quercetin, luteolin and genistein have been suggested to have cancer chemopreventive effects, although the mechanisms are not fully understood. In the present study, the effects of these flavonoids as antioxidants were investigated in the following systems: (1) production of hydrogen peroxide (H2O2) and superoxide anion (O2*-), (2) lipid peroxidation induced by FeCl2 in rat liver, and (3) formation of 8-hydroxy-2'-deoxyguanosine (8-OHdG) induced by either UV or Fenton reaction in calf thymus DNA. The results showed that quercetin and luteolin were equally potent in scavenging H2O2, with genistein having a moderate effect. Quercetin and luteolin had a potent inhibitory effect on O2*- generation by xanthine/xanthine oxidase while genistein had a moderate effect. Quercetin and luteolin were potent in inhibiting lipid peroxidation induced by FeCl2 in rat liver while genistein had a very weak inhibitory effect. All the test compounds had a potent quenching effect on 8-OHdG formation induced by UV light irradiation, with the order of effects being genistein > luteolin > quercetin. Of the test compounds, luteolin exhibited the most potent quenching effect on Fenton-induced 8-OHdG formation. The scavenging of oxygen free radicals, the inhibitory effect on lipid peroxidation and the quenching effect on 8-OHdG formation by quercetin, luteolin and genistein may, at least in part, be responsible for their anticarcinogenic effects.     

Antitumor activity and pharmacokinetics following oral administration of natural product DNA topoisomerase I inhibitors 10-hydroxycamptothecin and camptothecin in SCID mice bearing human breast cancer xenografts

The DNA topoisomerase I inhibitors, 10-hydroxycamptothecin (HCPT) and camptothecin (CPT), are indole alkaloids isolated from the Chinese tree, Camptotheca acuminata. They have been shown to have a wide spectrum of anticancer activity both in vitro and in vivo. However, their use has been limited due to their water-insolubility. The purpose of the present study was 2-fold, to determine the in vitro and in vivo activity of HCPT and CPT against human breast cancer and to determine the pharmacokinetics of the two drugs to better understand how they can best be used therapeutically. The bl vitro inhibitory effect on tumor growth was observed with breast cancer cell line MDA-MB-468. The in vivo antitumor effects were then determined using severe combined immunodeficient (SCID) mice bearing MDA-MB-468 xenografts. The tumor-bearing mice were orally administered HCPT (1, 3, 6, 9 mg/kg/day, 5 days per week) or CPT (1, 3, 6 mg/kg/day, 5 days per week) for 3 weeks. Growth of the MDA-MB-468 cells was inhibited by HCPT and CPT in vitro and in vivo in a dose-dependent manner. Complete regression of the tumor xenografts, determined by tumor measurement and microscopic examination, occurred in the groups of animals treated with doses of HCPT or CPT of 3 mg/kg/day or more. In general, HCPT was more effective and less toxic than CPT. To determine the potential mechanisms for the pharmacologic differences, the comparative pharmacokinetics of HCPT and CPT were determined in tumor-bearing SCID mice following i.v. or oral administration of H-3-HCPT or H-3-CPT. Parent drugs and their metabolites in plasma, urine, feces, and various tissues were quantified by a recently developed reversed-phase HPLC method. Significant absorption of both HCPT and CPT was observed after oral administration, with CPT having a higher bioavailability. HCPT and CPT were distributed widely into various tissues including the tumor, enterohepatic system, kidneys, and bone marrow. These studies indicate that HCPT and CPT are of potential use in treatment of breast cancer, providing the basis for the design of future human trials with these anticancer drugs.     

综合治疗对脑梗塞相关危险因素的影响

目的　探讨综合治疗对脑梗塞复发的相关危险因素的影响。方法　随机选择85 例脑梗塞伴各类危险因素患者在综合治疗前后,对他们进行血压、空腹血糖、胆固醇、甘油三酯及血液流变学等8 项指标的测定。结果　经过1 ～3 年临床观察随访,有50 % 以上高血糖、高血脂、高粘滞血症患者检验指标趋于正常,94 .3 % 的高血压得到控制与稳定,经t 检验,血液流变学4 项P 值< 0 .05 ,差异有显著意义,高血压、空腹血糖、胆固醇、甘油三酯的P 值< 0 .01 ,差异有非常显著意义。结论　综合治疗对控制相关危险因素,预防脑梗塞复发有重要临床意义     

中国地鼠情绪唤醒水平评定量表的制定

为建立一套适合于中国地鼠情绪唤醒水平观测的评定方法,并验证其可靠性,在Ａｄｅｒ 情绪唤醒评定方法基础上进行修订,对中国地鼠进行试测,建立情绪唤醒水平划界分。结果显示总分以５ 分为界,能区分高／ 低情绪唤醒水平的中国地鼠;条目与量表总分呈中高度相关（ ｒ ＝ ０ ．３２６８ ～０ ．７３４７） ,量表总分重测信度良好（ ｒ ＝ ０ ．５８７４ ～０ ．６１０５） ,评定者评分一致性高,符合率达９５－２ ％     

Prevalence and anatomic characteristics of infarct-like lesions on MR images of middle-aged adults: the atherosclerosis risk in communities study.

BACKGROUND AND PURPOSE: MR imaging has revealed putative evidence of subclinical cerebrovascular disease (CVD) as reflected by white matter signal changes and infarct-like lesions (ILLs). Nonetheless, the prevalence of this condition in the general population has been defined only to a limited extent. We herein report the prevalence and anatomic characteristics of ILLs seen on cranial MR images obtained as part of a population-based study of cardiovascular disease in middle-aged adults. These results are contrasted to those of previous similar studies, particularly those of an elderly population in the Cardiovascular Health Study (CHS). METHODS: This Atherosclerosis Risk in Communities (ARIC) cohort consists of a probability sample of community-living persons who were 55 to 72 years old at the time of MR examination. MR imaging of 1890 participants was performed at two ARIC field centers, based on a common protocol. MR studies were evaluated by trained readers at the MR Reading Center using original digital data displayed on a high-resolution workstation. The measures of lesion size, anatomic location, and signal intensity were collected. The definition for an ILL was a non-mass, hyperintense region with an arterial vascular distribution on spin-density and T2-weighted images. RESULTS: Two hundred ninety participants had ILLs, for an overall prevalence of 15.3%. Eighty-two percent of participants with ILLs had lesions that were 3 mm or larger in maximal dimension, although 87% of these lesions were 20 mm or smaller in maximal dimension. The prevalence of ILLs increased with age, from 7.9% in the 55- to 59-year-old age group to 22.9% in the 65- to 72-year-old age group (P < .001). Lesion prevalence was greater in black (20.7%) than in white persons (10.2% [P < .0001]), but did not differ significantly between male and female participants. The basal ganglia and thalamic region was the most commonly affected anatomic site, accounting for 78.9% of the lesions. CONCLUSION: Considering that the prevalence of self-reported stroke or transient ischemic attack in ARIC participants is 1.5%, these results suggest that there is significantly more subclinical than clinical CVD in the general population. Furthermore, the prevalence of this subclinical disease increases with age, and is greater in black persons. ILLs are dominated by "lacunae" in the basal ganglia and thalamus. These results are, in general, similar to those of a comparable study of elderly participants in the CHS, except for a 60% lower prevalence of ILLs in this younger population.