Effect of antigen site and complement receptor status on the rate of cleavage of C3c antigen from red cell bound C3b

C3b was bound to human red cells when serum complement was activated by addition of antibodies directed against different red cell antigens, and the rate of cleavage to C3dg was determined by assay for loss of bound C3c antigens using radiolabeled monoclonal anti-C3c. When C3b was bound by antibodies to antigens on branched-chain glycoproteins, cleavage to C3dg occurred more rapidly than when C3b was bound by antibodies to antigens closer to the red cell lipid bilayer. The rate of cleavage to C3dg also correlated directly with the number of complement receptors (CR1) per red cell, reflecting their role as cofactors in the cleavage of iC3b by factor I. Thus, the life span of C3b/iC3b on human red cells, which may be important for determining the rate and mechanism of clearance of C3-coated red cells, appears to depend on the CR1 status of the red cells and the characteristics of the antigen sites around which complement is bound.     

Graves病患者治疗前后血清可溶性细胞凋亡相关蛋白Fas的含量变化及其意义

目的探讨Graves病(GD)131I治疗前后血清可溶性细胞凋亡相关蛋白Fas(sFas)的变化特点及其临床意义。方法用固相夹心法酶联免疫吸附试验(ELISA)检测61例GD患者131I治疗前及治疗后不同时期血清sFas含量,并与对照组比较。结果(1)131I治疗前组sFas含量为(174.8±94.6)ng/L,明显高于对照组(96.6±10.2)ng/L(P<0.01);与131I治疗前组相比,缓解期组sFas含量(132.8±34.4)ng/L下降,但差异无统计学意义(P>0.05),临床治愈组sFas含量(111.2±13.3)ng/L进一步下降,差异有统计学意义(P<0.05);甲状腺功能减退(甲低)组患者sFas含量(101.9±16.4)ng/L最低,差异有统计学意义(P<0.01)。(2)sFas与GD患者甲状腺激素(TH),包括TT3、TT4、FT3、FT4及促甲状腺激素受体抗体(TRAb)呈正相关(r=0.37~0.59,P<0.05),与年龄、甲状腺球蛋白抗体(TGAb)和甲状腺微粒体抗体(TMAb)等无明显相关关系。结论GD患者体内存在sFas异常表达,131I治疗后不同时期内sFas含量呈下降趋势。     

腺病毒介导人血管内皮生长因子165基因转染促进人骨髓间充质干细胞的成骨特点

目的：课题组以前的实验证实，人血管内皮生长因子165基因重组腺病毒可高效感染人骨髓间充质干细胞，使之大量表达人血管内皮生长因子165，促进局部新生血管生成，有利于组织修复。实验观察腺病毒介导人血管内皮生长因子165基因转染对人骨髓间充质干细胞成骨能力的影响。 方法：实验于2005—03／2006—01在郧阳医学院附属人民医院临床研究所和创伤骨科完成。人骨髓间充质干细胞取自健康成年男性自愿者，得到医院伦理道德委员会批准。将人骨髓间充质干细胞体外扩增纯化后随机分为4组：①人血管内皮生长因子基因重组腺病毒组。②β-半乳糖酐酶基因重组腺病毒组。③阳性对照组：培养液中添加地塞米松、抗坏血酸和β-甘油磷酸钠。④空白对照组：不给予特殊处理。各组细胞处理后12d，应用全自动生化分析仪检测各组培养上液碱性磷酸酶活性；于处理后14d，应用VonKossa染色法检测人骨髓间充质干细胞中骨胶原结节形成情况。 结果：①经多次换液传代，人骨髓间充质干细胞呈均一梭形形态。处理后人血管内皮生长因子基因重组腺病毒组与阳性对照组细胞形态逐渐趋于扁平，突起减少；β-半乳糖酐酶基因重组腺病毒组和空白对照组形态无明显变化。②Yon Kossa染色人血管内皮生长因子基因重组腺病毒组与阳性对照组可见大量红色骨胶原结节形成，明显多于β-半乳糖酐酶基因重组腺病毒组和空白对照组。③人血管内皮生长因子基因重组腺病毒组与阳性对照组培养上清碱性磷酸酶活性显著高于β-半乳糖酐酶基因重组腺病毒组和空白对照组（F=165．18，P=0．00）。结论：人血管内皮生长因子165基因重组腺病毒基因转染对人骨髓间充质于细胞成骨能力具有促进作用，验证了转染人血管内皮生长因子165的人骨髓间充质干细胞移植治疗骨疾病的可行性。     

Simultaneous presentation of coeliac disease and ulcerative colitis in a child

Coeliac disease and inflammatory bowel disease (IBD) individually are not uncommon in children, but the occurrence of both conditions together is rare. The combined presentation of coeliac disease and IBD in a girl of 7 years is presented with a review of the related literature. The occurrence of coeliac disease with IBD should be considered at the time of diagnosis and at relapse, or where there is difficulty maintaining remission in established IBD. Screening with serum antibody tests may be helpful.