过继转输胚胎抗原耐受T细胞诱导自然流产孕鼠母胎免疫耐受

探讨过继转输胚胎抗原耐受T细胞对小鼠自然流产模型妊娠预后及宿主孕鼠免疫细胞对父系抗原免疫耐受状态的影响。以CBA/J×BALB/c为正常妊娠模型 ,CBA/J×DBA/ 2为自然流产模型 ,将自然流产模型CBA/J孕鼠于孕 4d (着床期 )分别腹腔注射大鼠抗小鼠CD80和CD86mAb或大鼠同型IgG。于孕 9d ,应用免疫磁珠阴性分选三组孕鼠的脾脏T细胞 ,并将三组T细胞分别转输至孕 4d的CBA/J×DBA/ 2孕鼠。于宿主孕鼠孕第 9天 ,采用单向混合淋巴细胞反应分析宿主孕鼠脾脏免疫细胞对父系抗原的增殖能力 ,并用流式细胞术分析经父系抗原刺激的宿主孕鼠脾脏T细胞内IL 2表达水平。于孕 1 4d分别观察宿主孕鼠的胚胎吸收率。结果显示 ,过继转输胚胎抗原耐受T细胞和转输正常妊娠模型孕鼠的T细胞均可诱导宿主孕鼠脾脏免疫细胞对父系抗原的增殖能力及IL 2的表达显著下降 (P <0 0 5 ) ,孕 1 4d胚胎吸收率也显著下降 (P <0 0 5 )。这些结果表明 ,于孕早期过继转输胚胎抗原耐受T细胞和转输正常妊娠模型孕鼠的T细胞能诱导宿主孕鼠母 胎免疫耐受 ,防止母体对胚胎的免疫排斥 ,从而使自然流产模型的妊娠预后达到正常妊娠水平。     

Gain-of-function polymorphism in mouse and human Ltk: implications for the pathogenesis of systemic lupus erythematosus

Systemic lupus erythematosus (SLE), a complex multigenic disease, is a typical antibody-mediated autoimmune disease characterized by production of autoantibodies against a variety of autoantigens and immune complex-type tissue inflammation, most prominently in the kidney. Evidence suggests that genetic factors predisposing to aberrant proliferation/maturation of self-reactive B cells initiate and propagate the disease. In SLE-prone New Zealand Black (NZB) mice and their F1 cross with New Zealand White (NZW) mice, B cell abnormalities can be ascribed mainly to self-reactive CD5+ B1 cells. Our genome-wide scans to search for susceptibility genes for aberrant activation of B1 cells in these mice showed evidence that the gene, Ltk, encoding leukocyte tyrosine kinase (LTK), is a possible candidate. LTK is a receptor-type protein tyrosine kinase, belonging to the insulin receptor superfamily, and is mainly expressed in B lymphocyte precursors and neuronal tissues. Sequence and functional analyses of the gene revealed that NZB has a gain-of-function polymorphism in the LTK kinase domain near YXXM, a binding motif of the p85 subunit of phosphatidylinositol 3-kinase (PI3K). SLE patients also had this type of Ltk polymorphism with a significantly higher frequency compared with the healthy controls. Our findings suggest that these polymorphic LTKs cause up-regulation of the PI3K pathway and possibly form one genetic component of susceptibility to abnormal proliferation of self-reactive B cells in SLE.     

聚醚型聚氨酯材料表面纤维蛋白原的吸附性研究

本文采用放射性同位素标记的方法研究了嵌段聚醚型聚氨酯在纯纤维蛋白原溶液中和稀释血浆中的表面纤维蛋白原吸附性规律，考察了聚醚型聚氨酯的特性粘数及溶液体系中的ＮａＣｌ浓度对材料表面纤维蛋白原吸附性的影响，结果表明，随着聚合物特性粘数的增大，材料表面的纤维蛋白原吸附量呈降低的趋势；溶液体系中盐浓度的降低导致纤维蛋白原凝固性增强，在纯纤维蛋白原溶液中，材料表面纤维蛋白原的吸附量相应增多，而在稀释血浆中，纤维蛋白原的吸附量相应减少，在达到最低值后又有上升的趋向，表明纤维蛋白原在材料表面的吸附还受血浆中其它大分子的影响。     

三维超声测胎儿股容积估计胎重的价值

目的通过对57例妊娠分别使用二维、三维超声测量相关参数估计胎重，并作统计学比较，从而评价三维超声对于估测胎儿体重、诊断胎儿发育迟缓及巨大胎的优势和价值。方法对2005年10月至2006年3月间在我院分娩的57例妊娠，研究组用三维超声测胎儿股容积估计胎重，对照组用二维超声同步测量相关参数估计胎重。结果对两组估重结果与胎儿实际出生体重作相关统计学分析，研究组相关系数为0．983，对照组为0．906（P〈0．05），前者与实际体重关系更密切。结论三维超声测量胎儿股容积估测胎儿体重，较传统二维超声具有更大优势，对于发现胎儿发育迟缓（FGR）及巨大胎意义重大，有利于指导临床冶疗、选择分娩方式。     

司帕沙星对试验动物的一般药理研究

小鼠单次经口灌服司帕沙星4、20和100mg/kg后,动物的活动正常,未出现兴奋的抑制作用;小鼠单次经口灌服司帕沙星4、20和100mg/kg,与戊巴比妥钠镇静催眠无明显协同作用;给猫静脉注射司帕沙星4、16和64mg/kg,对动物呼吸和心血管系统无明显影响。     

A tctex1-Ca2+ channel complex for selective surface expression of Ca2+ channels in neurons

Voltage-gated Ca(2+) channels (VGCCs) are important in regulating a variety of cellular functions in neurons. It remains poorly understood how VGCCs with different functions are sorted within neurons. Here we show that the t-complex testis-expressed 1 (tctex1) protein, a light-chain subunit of the dynein motor complex, interacts directly and selectively with N- and P/Q-type Ca(2+) channels, but not L-type Ca(2+) channels. The interaction is insensitive to Ca(2+). Overexpression in hippocampal neurons of a channel fragment containing the binding domain for tctex1 significantly decreases the surface expression of endogenous N- and P/Q-type Ca(2+) channels but not L-type Ca(2+) channels, as determined by immunostaining. Furthermore, disruption of the tctex1-Ca(2+) channel interaction significantly reduces the Ca(2+) current density in hippocampal neurons. These results underscore the importance of the specific tctex1-channel interaction in determining sorting and trafficking of neuronal Ca(2+) channels with different functionalities.     

125I-白细胞介素-8在小鼠体内的分布研究

为了解白细胞介素 - 8的体内行为 ,用 Bolton- Hunter法对 IL- 8进行 1 2 5I标记 ,并测定它在小鼠体内的分布 ;得到了 1 2 5I- IL- 8在小鼠血、心、肝、肺、肾、骨、脾等脏器中的分布以及它在血液中的快相半排期 T1 /2α为 0 .3 2 h和慢相半排期 T1 /2β为 8.0 1h。1 2 5I- IL- 8主要通过肾排除     

Temperature rising elution fractionation of a random ethene/styrene copolymer

A random ethene/styrene copolymer containing 13.8 mol-% styrene was prepared with the Ziegler-Natta catalyst system Me₂Si(Me₄Cp)(N-t-butyl)TiCl₂/methylaluminoxane and characterized by means of preparative temperature rising elution fractionation (TREF) combined with size exclusion chromatography, NMR, differential scanning calorimetry and wide-angle X-ray scattering analyses of the copolymer fractions. Efforts are made to describe the distribution of the styrene content of the copolymers using the Stockmayer-Tacx distribution function. Both, comonomer distribution and molar mass distribution strongly support the presence of a single type of catalytically active center.