NOD小鼠胸腺细胞TCR介导的信号通路缺陷

目的 进一步研究NOD小鼠T细胞应答改变机理。方法 用抗TCR抗体、ConA激活NOD小鼠胸腺细胞，分析TCR介导的信号通路的水平。结果 与Balb／c小鼠胸腺细胞相比，抗TCR抗体诱导的增殖应答较弱，与年龄及NOD胸腺CD4^ CD8^-和CD4^-CD8^ SP细胞有关；rIL-2能部分恢复对TCR抗体应答的缺乏。NOD小鼠对PMA IONO和PMA anti—TCR-mAb应答正常，但对anti-TCRmAb IONO应答缺乏。结论 与年龄有关的NOD小鼠胸腺细胞对TCR抗体应答的缺乏与T细胞激活时上游PKC信号通路的缺乏有关。     

人工髓核材料-聚乙烯醇水凝胶/聚乙烯纤维复合物的生物相容性研究*

目的评估人工髓核材料聚乙烯醇水凝胶/聚乙烯纤维复合物的生物相容性。方法根据ISO10993-1标准,采用细胞毒性试验(琼脂扩散法)、皮内刺激试验、Ame's致突变试验、微核试验和体内植入(360天)试验对聚乙烯醇水凝胶/聚乙烯纤维复合物的生物相容性进行评估。结果聚乙烯醇水凝胶/聚乙烯纤维复合物的细胞毒性评分小于Ⅰ级,细胞生长无明显抑制现象,对皮内无刺激作用,Ames致突变试验为阴性,微核出现率为3.48‰,无致突变反应。体内植入符合植入材料生物学评价要求。结论聚乙烯醇水凝胶/聚乙烯纤维复合物具有良好的生物安全性,是一种无毒、对皮肤及肌肉、椎间隙无刺激作用的生物医用材料,在动物体内不引起排异反应,可应用于临床。     

Efficacy of traditional Chinese herbs on squamous cell carcinoma of the esophagus: histopathologic analysis of 240 cases

Three types of traditional Chinese herb medicine were used to treat 98 patients with advanced esophageal squamous cell carcinoma prior to surgical treatment. Forty-two patients with the same diagnosis were treated with these herbs plus cyclophosphamide (endoxan). One hundred similar patients received surgical treatment without herbs or endoxan treatment as controls. Histologic examinations of surgical specimens were made on all of these patients. Stromal lymphoid-cell infiltration and cancer tissue degeneration were more prominent in Menispernum dehuricum DC- or Chelidonium majus L-treated patients, and were less clear in patients treated with herbs plus endoxan and the controls. The antitumor action of herbs is thought to be brought about by the activation of an immunological rejection mechanism. Herbs plus endoxan may result in the masking of the immunological response of hosts without obviously damaging cancer tissues.     

Adult-onset type II citrullinemia and idiopathic neonatal hepatitis caused by citrin deficiency: involvement of the aspartate glutamate carrier for urea synthesis and maintenance of the urea cycle

Citrin is a mitochondrial aspartate glutamate carrier primarily expressed in the liver, heart, and kidney. We found that adult-onset type II citrullinemia is caused by mutations in the SLC25A13 gene that encodes for citrin. In this report, we describe the frequency of SLC25A13 mutations, the roles of citrin as a member of the urea cycle and as a member of the malate-aspartate shuttle, the relationship between its functions and symptoms of citrin deficiency, and therapeutic issues.     

毫米波辐射对植入前小鼠胚胎及早期胚胎的影响

本文报道小鼠受精卵体外及在体受毫米波辐照后一些改变。毫米波源为36.11GHz固态微波连续发生器,波长8mm,功率密度为10mW/cm~2、8mW/cm~2、4mW/cm~2及2mW/cm~2。结果发现2-4mW/cm~2毫米波辐照即可使体外培养之受精卵细胞表面微绒毛减少、脱落,细胞表面形成许多囊泡。透射电镜下可见细胞间隙扩大、胞浆中线粒体膨胀、空化,用FITC-ConA试验可见细胞表面结合荧光减少。酶试验证明辐照后卵胚细胞表面AKP,ATPase,5′-Nase均有降低。在体受精卵细胞经辐射后证明,辐射可使胎儿体重增长减慢,囊胚形成数量下降,植入率降低,而表面酶下降不明显。     

免疫-PCR法检测儿童尿中生长激素水平

目的 :建立超灵敏度的免疫 PCR法检测尿中生长激素的水平。方法 :在经戊二醛处理的PCR管中完成双抗夹心酶免疫反应 ,通过PCR扩增连接在抗原 抗体复合物上的DNA分子 ,琼脂糖电泳及扫描判断结果。结果 :处理后的PCR管完全能够进行免疫反应 ,其灵敏度可达 0 1pg ml左右。琼脂糖电泳及扫描结果表明 ,30例正常青春发育期前儿童与 1 0例经常规生长激素激发试验诊断为生长激素缺乏 (growthhormone deficient,GHD)的儿童 ,1 2h夜尿生长激素 (GH)水平有明显差异。结论 :此法的敏感度比酶标法高 1 0 3 ～ 1 0 4倍 ,适于儿童尿中微量GH水平的检测     

共刺激分子B7.1在淋巴瘤组织中的表达

目的研究免疫共刺激分子Ｂ７．１在淋巴瘤组织中的表达及其在肿瘤免疫逃逸机制中的作用。方法利用ＲＴ－ＰＣＲ及原位杂交技术对１２例新鲜及２３例石蜡包埋淋巴瘤组织中Ｂ７．１的表达进行了检测。结果１０／１２例新鲜瘤组织及１６／２３例石蜡包埋瘤组织Ｂ７．１表达阳性，同时还意外发现，所有阳性标本中还强表达一种与正常Ｂ７．１分子不同但与其相关的ｍＲＮＡ转录子。结论该转录子与淋巴瘤的关系及在肿瘤免疫中的作用值得深入研究     

Novel micro-crosslinked poly(organophosphazenes) with improved mechanical properties and controllable degradation rate as potential biodegradable matrix

As biodegradable materials, linear polyphosphazenes undergo rapid hydrolysis degradation but exhibit poor mechanical properties. Blending with biodegradable polyesters or inorganic particles strengthen their mechanical properties but give rise to slower degradation rate. To balance the mechanical properties and the degradation rate, micro-crosslinked polyphosphazenes were synthesized in this study. Their glass transition temperatures, mechanical properties, and in vitro degradation behavior were investigated. 2-hydroxyethyl methacrylate (HEMA) was firstly attached to the side chain along with glycine ethyl ester to prepare co-substituted poly(organophosphazene) with pendant ethenyl substituents. The co-substituted poly(organophosphazene) was blended with HEMA or acrylic acid (AA) followed by a free radical polymerization to prepare micro-crosslinked poly(organophosphazenes). The resulting crosslinked polymers showed two separate glass transition temperatures depending on the HEMA or AA feed. Incorporation of crosslinking affected the mechanical properties positively. Crosslinked poly(organophosphazenes) showed an approximately 11-17 fold increase in terms of modulus of elasticity when compared to the linear counterpart. In vitro degradation tests indicated that HEMA-crosslinked polymers hydrolyzed at a retarded rate while AA-crosslinked polymers hydrolyzed at a moderate rate compared to linear polymers.     

构建基于移动互联网的患者赋能型心衰健康管理平台

目的构建基于移动互联网的患者赋能型心衰健康管理平台,促进心衰患者进行自我管理,改善临床结局。方法开展课题研究型品管圈活动,搜集高质量临床证据,构建患者赋能型心衰健康管理平台,通过平台推广与应用,对心衰患者行为进行干预。结果平台应用后,医护人员心衰知识水平显著提升,心衰患者自我护理能力明显提升,患者再入院率、死亡率明显下降,应用效果良好。结论基于移动互联网的患者赋能型心衰健康管理平台是心衰慢性病管理的有效手段。