CD44V6在肺鳞癌中的表达

目的 探讨CD44V6在肺鳞癌中的表达及其与肺鳞癌发生发展的相关性 。方法 应用免疫组织化学ABC法检测35例手术切除的新鲜肺鳞组织及 其癌旁正常肺组织的CD44V6蛋白,并将检测结果与患者的临床病理资料进行对照分析。结果 CD44V6在肺磷癌组织中的阳性表达率为65．7％（23／35）,而在癌旁正常肺组织中则无表达,二者差异有显著性（X^2=34．3,P＜0．01）;CD44V6在有淋巴结转移的肺鳞癌组织中的阳性表达率（84．2％,16／19）明显高于其在无淋巴结转移中的阳性表达率（43．8％,7／16）（X^2＝6．3,P＜0．01）;CD44V6阳性表达率随肺鳞癌组织分化程度的降低而或高,但无统计学意义（X^2=2．33,P＞0．05）;CD44V6在Ⅲ Ⅳ期肺鳞癌中的阳性表达率（86．7％,13／15）明显高于其在Ⅰ Ⅱ期中的阳性表达率（50％,10／20）,（X^2＝5．1,P＜0．01）;CD44V6阳性表达患者的3年生存率（30．4％,7／23）明显低于CD44V6阴性者（66．7％,8／12）（X^2＝4．2,P＜0．05）。结论 CD44V6可能与肺鳞癌的发生有关;CD44V6阳性预示肺鳞癌可能发生淋巴结转移,并对肺鳞癌的临床分期起到一定作用;CD44V6阳性还可作为评估肺鳞癌患者预后的参考指标。     

人同种异体移植炎症因子-1的基因克隆及其在小鼠成纤维细胞中的表达

目的构建人同种异体移植炎症因子-1(allograft inflammatory factor-1,AIF-1)基因的真核表达载体并在小鼠成纤维细胞系(NIH3T3)中表达,为进一步研究AIF-1蛋白的功能奠定基础。方法利用基因重组技术,构建带有AIF-1基因的2种重组真核表达载体:pcDNA3.1(-)/AIF-1与pEGFP-C1/AIF-1。利用脂质体法将2种重组质粒分别转染NIH3T3细胞,用荧光倒置显微镜及Western blot方法观察及鉴定AIF-1在细胞中的稳定表达及瞬时表达。结果酶切分析及DNA序列测定证实,AIF-1基因片段被分别克隆入真核表达载体pcDNA3.1(-)与pEGFP-C1。荧光显微镜观察到NIH3T3细胞中有绿色荧光分布。Western blot结果表明,转染重组质粒的NIH3T3细胞中,AIF-1表达量明显增高。结论成功构建了2种重组真核表达载体:pcDNA3.1(-)/AIF-1与pEGFP-C1/AIF-1,经转染NIH3T3细胞株获得了AIF-1蛋白的瞬时表达及稳定表达。     

p53 induces TAP1 and enhances the transport of MHC class I peptides

The transporter associated with antigen processing (TAP) 1 is required for the major histocompatibility complex (MHC) class I antigen presentation pathway, which plays a key role in host tumor surveillance. Since more than 50% of tumors have a dysfunctional p53, evasion of tumor surveillance by tumor cells may be linked to loss of p53 function. Here we found that TAP1 is strongly induced by p53 and DNA-damaging agents through a p53-responsive element. We also found that p73, which is homologous to p53, is capable of inducing TAP1 and cooperates with p53 to activate TAP1. Furthermore, we found that by inducing TAP1, p53 enhances the transport of MHC class I peptides and expression of surface MHC-peptide complexes, and cooperates with interferon gamma to activate the MHC class I pathway. These results suggest that tumor surveillance may be a mechanism by which p53 and/or p73 function as tumor suppressors.     

氰戊菊酯对包装工人心血管功能的亚临床影响

目的探讨氰戊菊酯对包装工人心血管功能的亚临床影响。方法对２２名氰戊菊酯包装工和１５名无毒物接触史和无心血管疾病史的工人进行横断面调查，分析其心血管功能的改变。结果包装车间空气中氰戊菊酯时间加权平均浓度（ＴＷＡ）为０．０１７５±０．００５７ｍｇ／ｍ３（ｎ＝４），包装工皮肤平均污染量为０．５１３４±０．４２１６ｍｇ／ｃｍ２（ｎ＝６），工人接触以皮肤污染为主；症状以皮肤粘膜刺激症为主；与对照组比较收缩压升高、心率加快，收缩压与尿中ＶＭＡ明显相关，心电图检查示（Ｑ－Ｔ）ｒ值增大。结论低浓度氰戊菊酯接触对作业工人心血管功能有影响。     

海口地区中老年人骨密度调查研究

目的分析海口地区中老年人骨密度（Bone mineral density BMD）及骨质疏松患病率变化规律，为骨质疏松防治提供科学依据。方法对长期居住海口地区的40岁以上的人群1110名，准确记录性别和年龄，采用美国LUNAR公司生产的DPX—MD型双能X线骨密度仪进行腰椎（L2-4）正位和髋部骨密度测量。结果随年龄增加骨密度逐渐下降，但男性65-69岁组的骨密度反有上升表现。同龄男性骨密度高于女性，骨质疏松患病率随年龄增加而上升。结论海口地区中老年人群应普及骨质疏松防治知识及采取相应干预措施，加强锻炼，以减少骨质疏松症的发生。     

NVC／BA共聚物的合成及其掺杂C60体系光电导性能研究

在ｔ＝３０－９０℃，ｐＣＯ２＝１４．８８－７２４．４ｋＰａ条件下，测定了ＣＯ２在ＭＤＥＡ、ＭＤＥＡ＋ＤＥＡ和ＭＤＥＡ＋ＰＺ水溶液中的溶解度，并用Ｇｉｂｂｓ－Ｈｅｌｍｈｏｌｔｚ方程计算ＣＯ２在活化ＭＤＥＡ水溶液中的溶解焓。     

红茶菌对家兔实验性动脉粥样硬化的预防作用

红茶菌能降低血清总胆固醇、甘油三脂和低密度脂蛋白,服用时间越长,效果越显著,但对高密度脂蛋白无明显作用。本文采用肉眼、光镜和透射电镜观察,结果红茶菌有抑制实验性动脉粥样硬化斑块的形成,且能明显减轻其病变程度。认为红茶菌对实验性动脉粥样硬化确有防治作用。     

Selecting an optimal prognostic system for liver cirrhosis: the model for end‐stage liver disease and beyond

In comparison with the Child–Turcotte–Pugh (CTP) system, recent studies suggested that the model for end‐stage liver disease (MELD) may more accurately predict the survival for patients with cirrhosis. In the US, the liver allocation system was changed in 2002 from a status‐based algorithm utilizing CTP scores to one using continuous MELD severity scores as a reference system in prioritizing adult patients on the waiting list. Direct evidence that demonstrates the benefits of MELD is the fact that the mortality rates of transplant candidates on the waiting list have remarkably decreased after the implementation of the MELD. The MELD score is closely associated with the degree of portal hypertension as reflected by the hepatic venous pressure gradient. Hyponatraemia occurs as a result of advanced cirrhosis, and a serum sodium (Na) level <126 mEq/L at the time of listing for transplantation is a strong independent predictor of mortality. Several MELD‐derived prognostic models that incorporate serum Na into calculation have been proposed in the hopes of further improving the MELD's prognostic accuracy. Additionally, serum parameters such as creatinine and international normalized ratio are subject to interlaboratory variations and may need unifying standardizations. Patients with refractory complications of cirrhosis may need a priority MELD score to prioritize them on the waiting list. Appropriate modifications and the fine‐tuning of the MELD based on well‐designed prospective studies are necessary in solving the current controversial issues.     

A Case of Primary Histiocytic Sarcoma Arising from Thyroid Gland

Histiocytic sarcoma (HS) is an extremely rare true histiocytic malignancy. We report a case of HS arising from thyroid gland in a 69 year-old man. Following subtotal thyroidectomy, a histopathologic, immunohistologic, and genotypic examination revealed HS. This tumor was composed of large spindle or round epithelioid cells with abundant eosinophilic cytoplasm. The neoplastic cells were positive for macrophage-associated antigen CD68, CD163, and lysozymes, as well as CD45, HLA- DR, DP, DQ, and S100, most consistent with a diagnosis of HS. The BIOMED-2 multiplex PCR analysis showed polyclonal B- and T-cell populations. To our knowledge, this is the first report of a rare entity HS involving thyroid gland using a comprehensive immunophenotyping panel including CD163 as well as molecular studies to establish the true histiocytic nature of these lesions.