MTEC 1分泌的趋化因子引起特定亚群胸腺细胞的定向迁移

分析胸腺髓质上皮样细胞系ＭＴＥＣ１分泌的化学趋化因子对胸腺细胞亚群的趋化作用。方法以抗体加补体杀伤结合免疫磁珠及ｐａｎｎｉｎｇ法，将小鼠胸腺细胞分离纯化，获得ＣＤ４＋ＣＤ８＋（ＤＰ），ＣＤ４－ＣＤ８－（ＤＮ），ＣＤ４＋ＣＤ８－（ＣＤ４ＳＰ）及ＣＤ４－ＣＤ８＋（ＣＤ８ＳＰ）四亚群细胞，用Ｂｏｙｄｅｎ小室分析ＭＴＥＣ１┐ＳＮ对四群胸腺细胞的趋化作用。结果ＭＴＥＣ１┐ＳＮ对ＤＰ及ＣＤ４ＳＰ胸腺细胞有趋化活性（ＣＩ＝６．６±１．０及６．１±１．８）；对ＣＤ８ＳＰ细胞有中度趋化活性（ＣＩ＝３．２±１．０）；对ＤＮ趋化活性微弱（ＣＩ＝１．３±０．６）。化学趋化因子ＭＣＰ┐１纯品对ＣＤ４ＳＰ胸腺细胞显示强趋化活性（ＣＩ＝５．６），对ＤＮ胸腺细胞则无可测出趋化活性。结论ＭＴＥＣ１分泌的化学趋化因子对ＤＰ，ＣＤ４ＳＰ及ＣＤ８ＳＰ胸腺细胞有显著趋化作用，对ＤＮ胸腺细胞几乎无趋化作用。提示此类化学趋化因子有趋使胸腺发育中后期阶段的细胞向胸腺髓质区迁移和定位的作用。     

颈椎病患者经颅多普勒检查与头颅CT和脑电图的关系

应用多普勒技术对50例确诊为椎动脉型颈椎病的患者进行了检查,结果30例异常。其中25例主要表现为不同程度的双侧颈动脉血流量对称性偏低,管径及头颅CT无异常,脑电图部分改变,主要表现为低幅慢波,经治疗后症状改善,多普勒复查正常,说明CT正常不能否定脑缺性血管病的存在,CT不能代替多普勒检查,另5例主要表现为双侧颈动脉血流量不对称,其中3例为双侧血管经狭窄,CT提示全脑萎缩,脑电图呈低幅慢波;另2例CT提示左颞后顶区,右枕外侧区梗塞,脑电图及脑电地形图表现相应部位慢波灶达6～7级。CT异常者,临床治疗效果欠佳,多普勒检查和脑电图及临床症状变化不大,故多普勒检查对监测脑动力循环有一定意义。     

圆斑蝰蛇毒中性磷脂酶A2对不同种类血管条作用的比较

本文比较了福建圆斑蝰蛇毒中性磷脂酶Ａ２（ＰＬＡ２－３）对人胃网膜动脉条、兔和大鼠主动脉条的作用，表面ＰＬＡ２－３对处于静息状态和预收缩状态的人网膜动脉能诱发松弛反应，而对大鼠和兔主动脉诱发剂量依赖性收缩反应，表明该ＰＬＡ２的血管作用具有血管种类差异性。ＰＬＡ２－３对大鼠主动脉的收缩反应是内皮细胞非依赖性的，去除内皮细胞能增强ＰＬＡ２－３所诱发的收缩反应；ＰＬＡ２－３所诱发的大鼠主动脉条收缩反应可能     

一氧化氮供体对缺血再灌注肾脏ICAM-1表达的影响

目的 观察缺血再灌注后加用NO供体对肾脏ICAM-1表达及白细胞浸润的影响。方法 分别采用ICAM-1和整合素β2多克隆抗体，免疫组化方法观察加有NO供体后大鼠肾脏缺血再灌注24hICAM-1表达的变化及肾功能改变。结果 缺血再灌注24h大鼠肾脏ICAM-1及β2阳性细胞表达显著增强，以外髓直小血管，皮质肾小管外毛细血管较为明显，再灌注同时灌注NO供体SIN-1可显著抑制缺血再灌注后ICAM-1的表达增强，减少局部炎细胞浸润，改善肾功能，结论 NO供体可减少肾组织ICAM-1的表达及炎细胞浸润，发挥对急性缺血性肾衰的治疗作用。     

白纹伊蚊和埃及伊蚊defensin A基因克隆及序列分析

应用PCR技术从白纹伊蚊和埃及伊蚊基因组中扩增出defensinA基因 ,并与文献报道的defensinA的5个型的cDNA序列进行同源性比较 ,发现此两序列中存在内元 ;从埃及伊蚊体内扩增的片段为蚊虫defen sinAl的前体AaDefAl;从白纹伊蚊体内扩增的片段为defensinA的 1个新型 ,命名为DefA6。     

THE EXPLORATION ON APPLIED VALUE OF BA IN DIAGNOSIS OF TIA

目的:探讨脑电地形图在短暂性脑缺血发作诊断中的应用价值.方法:在68例短暂性脑缺血发作患者中,进行了脑电地形图检查.结果:在67(98.52%)例患者中脑电地形图是异常的.40(58.82%)的患者脑电地形图在θ或δ频段显示高功率阴影,在α频段显示低功率阴影.14(20.59%)例患者在α频段显示低功率阴影.12(17.65%)例患者在θ或δ频段显示高功率阴影.1(1.47%)例患者在β频段显示低功率阴影.1(1.47%)例患者正常.结论:脑电地形图在短暂性脑缺血发作的临床诊断中具有重要意义.     

Cytogenetic findings in a breast stromal sarcoma. Application of fluorescence in situ hybridization to characterize the breakpoint regions in an 11;19 translocation.

Cytogenetic analysis of a stromal breast sarcoma revealed a complex karyotype that included a reciprocal 11;19 translocation, along with multiple numerical changes, deletions, and other unbalanced structural rearrangements. Karyotypic abnormalities have not been reported previously in this rare neoplasm that arises from mesenchymal breast tissue, and the t(11;19) is of interest because various types of sarcoma are characterized by specific reciprocal translocations. Because of the pericentric nature of the breakpoints on chromosomes 11 and 19 in the t(11;19), classical cytogenetic banding could not reveal the centromeric origin of the translocation derivatives. Using nonisotopic in situ hybridization with chromosome 11 and 19 alpha-satellite probes, the centromere of each derivative chromosome was determined, and the rearrangement was interpreted as a balanced translocation, t(11;19)(q12 or q13.1;p12 or p13.1). This abnormality has not been described previously in any breast tumor.     

Histologic and immunohistochemical characteristics of neoplastic and nonneoplastic subgroups of atypical squamous lesions of the uterine cervix

Atypical squamous lesion (ASL), a histologic diagnosis of unclear significance in the uterine cervix, can be divided into neoplastic and nonneoplastic groups. We aimed to determine the morphologic characteristics of these 2 groups. Histologic and immunohistochemical features were evaluated on the original biopsy specimen from 37 ASL cases, and the results were compared between neoplastic (19 cases) and nonneoplastic (18 cases) groups, which were determined based on the follow-up histopathologic findings. Mitosis, vertical nuclear growth pattern, no perinuclear halo, indistinct cytoplasmic border, primitive cells in the upper third of the squamous layer, p16+ cells in the upper two thirds of the squamous layer, and Ki-67+ cells in the upper two thirds of the squamous layer were significant indicators for neoplastic ASLs. Of the 19 neoplastic ASLs, 16 (84%) had 5 or more of these 7 indicators. The majority (16/18 [89%]) of the nonneoplastic ASLs had 2 or fewer indicators. Determination of the histologic and immunohistochemical characteristics is useful for distinguishing neoplastic and nonneoplastic ASLs.     

Requirements for the development of IL-4-producing T cells during intestinal nematode infections: what it takes to make a Th2 cell in vivo

Summary: Components of the type 2 immune response may mediate host protection against both helminthic parasites and harmful allergic responses. A central player in this response is the T‐helper 2 (Th2) effector cell, which produces interleukin (IL)‐4, IL‐5, IL‐13, and other Th2 cytokines during the primary and memory response. Specific aspects of the parasite that trigger Th2‐cell differentiation are not yet defined. Furthermore, the cell types and cell surface and secreted molecules that provide the immune milieu required for the development of Th2 effector cells and also Th2 memory cells are not well understood. They will probably vary with the particular helminth or other antigen inducing the Th2 response. We have used third stage larvae of intestinal nematode parasites as adjuvants to promote naïve nonparasite antigen‐specific T cells to differentiate into Th2 cells. This model system avoids possible parasite antigen‐specific T‐cell clones or cross‐reactive memory T cells that may preferentially differentiate into Th2 effector cells during the course of infection and confound the stereotypical components of parasite‐induced Th2 cell differentiation. We have found that these parasites have a potent adjuvant effect and have used our model system to begin to investigate the events that lead to the development of polarized Th2 cells in vivo.     

CD1d deficiency exacerbates inflammatory dermatitis in MRL-lpr/lpr mice

Mechanisms responsible for the development of autoimmune skin disease in humans and animal models with lupus remain poorly understood. In this study, we have investigated the role of CD1d, an antigen-presenting molecule known to activate natural killer T cells, in the development of inflammatory dermatitis in lupus-susceptible MRL-lpr/lpr mice. In particular, we have established MRL-lpr/lpr mice carrying a germ-line deletion of the CD1d genes. We demonstrate that CD1d-deficient MRL-lpr/lpr mice, as compared with wild-type littermates, have more frequent and more severe skin disease, with increased local infiltration with mast cells, lymphocytes and dendritic cells, including Langerhans cells. CD1d-deficient MRL-lpr/lpr mice had increased prevalence of CD4(+) T cells in the spleen and liver and of TCR alpha beta (+)B220(+) cells in lymph nodes. Furthermore, CD1d deficiency was associated with decreased T cell production of type 2 cytokines and increased or unchanged type 1 cytokines. These findings indicate a regulatory role of CD1d in inflammatory dermatitis. Understanding the mechanisms by which CD1d deficiency results in splenic T cell expansion and cytokine alterations, with increased dermal infiltration of dendritic cells and lymphocytes in MRL-lpr/lpr mice, will have implications for the pathogenesis of inflammatory skin diseases.