Diverse locations of amino acids in HLA-DR beta chains involved in polymorphic antibody binding epitopes on DR(alpha, beta 1*0101), DR(alpha, beta 1*1101), and DR(alpha,beta 3*0202) molecules.

In a previous study, we used transfectants expressing hybrid HLA-DR(beta 1*0403)/DR(beta 1*0701) chains to map sequences involved in polymorphic antibody binding epitopes on DR(alpha, beta 1*0403) or DR(alpha, beta 1*0701) molecules. Amino acids 1-40 of the beta 1 domain were found to make the major contributions to most of the antibody binding epitopes studied. To begin to localize sequences that contribute to polymorphic antibody epitopes on DR(alpha,beta 1*0101), DR(alpha,beta 1*1101) and DR(alpha,beta 3*0202) molecules, we used indirect immunofluorescence and flow cytometry to assess the binding of mAb to transfectants expressing hybrid DR(beta 1*0101)/DR(beta 1*1101) or DR(beta 1*1101)/DR(beta 3*0202) chains that divide the DR beta chain into three segments: amino acids 1-40, 41-97, and the beta 2 domain. The results indicate that amino acids 41-97 of the beta 1 domain on DR(beta 1*0101), DR(beta 1*1101), or DR(beta 3*0202) are critical in most of the epitopes, including those recognized by human antibodies MP4 and MP12, and mouse mAb GS88.2, I-LR1, 21r5, and 7.3.19.1, whereas amino acids 1-40 of DR(beta 1*1101) are critical in the epitope recognized by the MCS-7 mAb, and both segments 1-40 and 41-97 of DR(beta 1*1101) are important in the epitopes recognized by the I-LR2 and UL-52 mAbs. Based on these data and comparison of DR beta allelic protein sequences, the residues that may play critical roles in these antibody binding epitopes are predicted.     

不同剂量病毒唑治疗肾综合征出血热306例疗效分析

应用不同剂量病毒唑对３０６例肾综合征同血热患者进行治疗对比观察，发现两治疗组疗效无显著性差异，但两治疗组怀对照组相比，越期率高，肾功能恢复快，血小板数恢复早，病程缩短，并发症减少，病死率也有所下降，但无显著性差异。     

A new haplogroup pattern displayed in Fujian Han in China

Human Y-chromosomal binary polymorphisms have been considered to preserve the paternal genetic legacy and provide evidence on human evolution and the genetic relationships among and demographic history of different populations. To reveal the genetic origin and immigration of the Fujian Han, 13 binary markers on the Y chromosome were used to screen Fujian Han by allele-specific polymerase chain reaction. The results indicated that the M₉G marker was highly prevalent (96.20%), suggesting a significant genetic drift. In addition, M₁₂₂C frequency was only 22.78%, and M₄₅A and M₁₀₃T were default. The distinctive haplogroup frequencies (H₁, H₅, and H_6/7/8) imply that the haplogroup pattern is a relatively ancestral and interim type. Received: October 13, 2001 / Accepted: December 3, 2001     

慢性乙型肝炎患者肝组织FasL表达与血清可溶性FasL水平的关系

目的：探讨慢性乙型肝炎患者肝组织中FasL表达与血清可溶性FasL水平的关系。方法：用免疫组化方法检测60例慢性乙型肝炎患者肝穿组织FasL的表达,同时用酶联免疫吸附试验检测血清可溶性FasL。结果：重度慢性乙型肝炎患者血清中sFasL水平＞中度＞轻度,各组间差异有显著意义（P＜0．01）;慢性乙型肝炎患者肝组织FasL表达的程度和血清sFasL水平与肝组织病变的活动性一致。结论：（1）肝组织炎症程度加重,肝组织FasL抗原的表达增强,同时血清中sFasL水平升高;（2）Fas介导的肝细胞凋亡在慢性乙型肝炎的发病机制中起重要作用,抑制肝细胞Fas表达有助于减轻肝细胞损伤程度。     

蜕皮甾酮对冠状动脉闭塞致大鼠心肌梗死的有益作用及机制

目的 探讨植物有效成分蜕皮甾酮（ecdysteron,EDS)对心肌梗死有益作用,并探讨其机制。方法 采用冠状动脉左前降支结扎致大鼠心肌梗死模型,ip EDS,连续7d。测定血清肌酸磷酸激酶（CPK）、谷草转氨酶（GOT）、乳酸脱氢酶（LDH）活性、心肌梗死面积、冠状动脉血清、毛细血管密度及血管内皮生长因子（VEGF）的表达量。结果 0．5,5,50mg/kgEDS能剂量能依赖地影响大鼠血清CPK、GOT、LDH活性,以5mg/kg剂量的EDS降低心肌酶谱为最佳。5mg/kgEDS能明显减少心肌梗死面积、增加冠状动脉血流量、毛细血管密度和VEGF表达量。结论 EDS能减轻冠状动脉结扎致心肌梗死,机制在于促进VEGF的表达和毛细血管再生及增加冠状动脉血流量。