成纤维细胞生长因子Ⅱ型受体功能获得型点突变影响小鼠颅底软骨发育

目的:对比野生型小鼠和成纤维细胞生长因子Ⅱ型受体(fibroblast growth factor receptor2,fgfr2)基因S252W突变型小鼠颅底软骨的生长发育情况,探讨fgfr2功能持续增强对小鼠颅底软骨发育的影响。方法:实验于2004-03/2005-04在解放军第三军医大学大坪医院野战外科研究所创伤中心实验室,创伤、烧伤与复合伤国家重点实验室完成。①fgfr2 小鼠和C57BL/6J小鼠交配后取F1代,利用聚合酶链反应方法进行fgfr2突变型小鼠基因型的鉴定,得到野生型和fgfr2受体功能获得型点突变型两组小鼠。②标本取材及处理:分别在两组实验动物中,取胚胎期16d(E16)、胚胎期17d(E17)、新生2d(P2)、新生8d(P8)的小鼠的颅底作为标本。一部分体积分数为0.75的乙醇溶液固定。另一部分标本行40g/L多聚甲醛固定,150g/L乙二胺四乙酸溶液脱钙,常规石蜡包埋、切片。③阿尔辛-茜素红骨架染色显示颅底整体骨骼的发育情况。软骨组织染为蓝色,骨组织染为红色。④脱钙骨切片后进行苏木精-伊红染色。未脱钙骨切片后进行Calcein染色,荧光显微镜下观察钙化组织的情况。⑤使用地高辛RNA标记试剂盒按照产品说明制备Col 10(Collagen 10)地高辛标记的互补RNA探针,对颅底软骨联结进行检测软骨分化标志基因表达情况的原位杂交。⑥组织切片染色结果使用SPOT Advanced软件进行数码拍摄。结果:①实验小鼠颅底发育的大体情况:fgfr2受体功能获得型点突变小鼠从胚胎后期开始就表现出短颅现象。②阿尔辛蓝-茜素红骨架染色、Calcein染色和苏木精-伊红染色显示,fgfr2受体功能获得型点突变小鼠出生后颅底软骨联结没有出现提前融合的现象,但是颅底软骨生长发育差,软骨细胞增生区、肥大区缩短。突变小鼠的颅底软骨发育障碍导致颅底骨组织的生长发育也出现障碍。③原位杂交:Col10在野生型和突变型小鼠颅底软骨的表达部位未见明显差异,但是这个软骨细胞分化标志基因的表达强度降低。结论:fgfr2 S252W点突变能够引起小鼠颅底软骨联结处的软骨细胞发育异常,导致颅底骨骼发育畸形。fgfr2可能具有调控软骨细胞系发育的功能,从而可能在骨骼发育、骨折修复等方面发挥重要作用。     

Progress in laparoscopic anatomy research: A review of the Chinese literature

The development of laparoscopic surgery has generated the new field of study, laparoscopic anatomy. This article reviews the reported literature on laparoscopic anatomy and explores how it has evolved along with advances in abdominal surgery. In addition, the principal concerns in current laparoscopic anatomy research are discussed, including: (1) types of special adjacent anatomical structures; and (2) special surgical planes and anatomical landmarks. Understanding of systematic laparoscopic anatomy can pr...     

Exploring the oral bacterial flora: current status and future directions

Oral Diseases (2010) 16 , 136–145 Objective: The oral cavity forms an indispensable part of the human microbiome, for its unique and diverse microflora distributed within various niches. While majority of these organisms exhibit commensalism, shifts in bacterial community dynamics cause pathological changes within oral cavity and distant sites. The aim of this review was to appraise the current and emerging methods of detecting bacteria of the oral cavity paying particular attention to the cultivation independent methods. Design: Literature pertaining to cultivation based and cultivation independent methods of oral bacterial identification was reviewed. Methods: The specific advantages and disadvantages of cultivation based, microscopic, immunological and metagenomic identification methods were appraised. Results: Because of their fastidious and exacting growth requirements, cultivation based studies grossly underestimate the extent of bacterial diversity in these polymicrobial infections. Culture independent methods deemed more sensitive in identifying difficult to culture and novel bacterial species. Conclusion: Apart from characterizing potentially novel bacterial species, the nucleic acid sequence data analyzed using various bioinformatics protocols have revealed that there are in excess of 700 bacterial species inhabiting the mouth. Moreover, the latest pyrosequencing based methods have further broadened the extent of bacterial diversity in oral niches.     

A review of studies of parent-child communication about sexuality and HIV/AIDS in sub-Saharan Africa

Parent-child sexuality communication has been identified as a protective factor for adolescent sexual and reproductive health, including HIV infection. The available literature on this topic in sub-Saharan Africa is increasing; however a systematic review of studies has not been conducted. This article reviews the literature in the area of parental or caregiver and child communication about sexuality and HIV/AIDS in sub-Saharan Africa. A review of peer reviewed literature published between 1980 and April 2011 was conducted. Communication process studies investigating the frequency, content, style, tone of discussions, preferences, as well as associations with and barriers to sexuality communication are reviewed. In addition, studies which examine behavioral associations with parent-child sexuality communication, and intervention studies to improve parent-child sexuality communication are examined. The findings from process studies suggest wide variation in terms of frequency of discussions, with a range of socio-demographic and other factors associated with sexuality communication. Overall, findings demonstrate that discussions tend to be authoritarian and uni-directional, characterized by vague warnings rather than direct, open discussion. Moreover, parents and young people report a number of barriers to open dialogue, including lack of knowledge and skills, as well as cultural norms and taboos. Findings are less clear when it comes to associations between parental communication and adolescent sexual activity and contraception use. However, nascent indications from intervention research suggest positive findings with increases in frequency and comfort of discussions, among other outcomes. Gaps in the research are identified and discussed with implications for future studies.     

Nitric oxide inactivates the retinoblastoma pathway in chronic inflammation

Patients with chronic inflammatory bowel disease have a high risk of colon cancer. The molecules that initiate and promote colon cancer and the cancer pathways altered remain undefined. Here, using in vitro models and a mouse model of colitis, we show that nitric oxide (NO) species induce retinoblastoma protein (pRb) hyperphosphorylation and inactivation, resulting in increased proliferation through the pRb-E2F1 pathway. NO-driven pRb hyperphosphorylation occurs through soluble guanylyl cyclase/guanosine 3',5'-cyclic monophosphate signaling and is dependent on the mitogen-activated protein kinase/extracellular signal-regulated kinase kinase MEK/ERK and phosphatidylinositol 3-kinase/AKT pathways. Our results reveal a link between NO and pRb inactivation and provide insight into molecules that can be targeted in the prevention of the inflammation-to-cancer sequence.     

抗病毒药物2,5,6-三取代-4(3H)嘧啶酮衍生物的合成及诱导干扰素活性

In order to search for more ideal antiviral drugs,21 substituted pyriiT1idinone derivatives were designed and synthesized,among which 11 were not reported before. The cheinicalstructures were characterized by elemen tal and spectral analysis. The serum interferon - inducing activity was tested in mice. All 2-amino-5-bromo-6-substituted-4-(3H)pyrimidinone compounds were shown to have interferon inducing activity.The corresponding substituted pyrimidine thiones were less active.The new compounds of 6-sulfophenyl derivatives are soluble in、water, but the interferon-inducing activity are not higher than the original compound of ABPP.     

抗病毒药物2，5，6-三取代－4（3H）嘧啶酮衍生物的合成及诱导干扰素活性

抗病毒药物２，５，６-三取代－４（３Ｈ）嘧啶酮衍生物的合成及诱导干扰素活性刘新泳，徐丽君（山东医科大学药学系济南２５００１２）取代嘧啶酮类化合物是一类小分干扰素诱导剂，有抗病毒、抗肿瘤、杀菌抑霉、诱导干扰素和白介素、免疫调节等多种生物活性（１）。目前?..     

新型缩氨基硫脲衍生物——氨基巯三唑Schiff碱的合成与抗菌活性

设计合成了新型缩氨基硫脲衍生物4-氨基-3-(呋喃-2)-5-巯基-1,2,4-三唑及其十种不同醛的Schiff碱衍生物,并进行了抑菌实验。结果表明:Schiff碱化合物结构中的甲亚胺基是该类化合物的活性功能基。苯环上更换不同的取代基对其活性有一定的影响,其中化合物4-(5-硝基亚糠基氨基)-3-(呋喃-2)-5-巯基-1,2,4-三唑(Ik)抗菌活性最高且抗菌谱最广;化合物4-亚水杨基氨基-3-(呋喃-2)-5-巯基-1,2,4-三唑(Ib)具有较强的抑霉活性。     

The influence of beta-cyclodextrin on the solubility and dissolution rate of paracetamol solid dispersions.

The effect of cyclodextrin (beta-CD) on the solubility and dissolution rate of various paracetamol dispersion powders (1:1 w/w), and tablets was studied. Lower solubility was exhibited by a spray dried solid dispersion made from paracetamol-Ethocel-Macrogol 6000 (95:2:3). The improvement in solubility was influenced by complexation with beta-CD and the crystalline nature of the powder products made by different procedures. The difference in crystallinity was confirmed by X-ray powder diffraction patterns. The dissolution rate of paracetamol from tablets made from the solid dispersions was satisfactory compared with paracetamol alone. The differences between the dissolution rate from the examined paracetamol tablets resulted from the different solubility of each powder and from the structural changes of particles which influenced the consolidation of the tablet mass.     

Defective T suppressor-inducer cell function in human immune deficiency virus-seropositive hemophilia patients

In human immune deficiency virus (HIV)-seropositive hemophilia patients, a low number of CD4 + lymphocytes is found, as well as a low CD4+/CD8+ ratio. In previous studies, it has been shown that antigen- specific T-helper cell (CD4+) function was present and no excessive antigen-specific T-suppressor cell (CD8+) function could be demonstrated. In this report, we studied another activity of CD4+ cells, namely the capacity to induce T-suppressor cell activity. The results clearly show a selective dysfunction of CD4+ suppressor-inducer (Tsi) cell function. Since these HIV-seropositive hemophilia patients showed the presence of activated B cells in the peripheral circulation refractory to antigen-specific T-helper cell signals and secreting specific antibodies spontaneously, we raised the hypothesis that the activated B cells in the patients activate the Tsi cells in vivo. This constant activation leads to a functional exhaustion of the Tsi cell pool.