First trimester development of human chorionic villous vascularization studied with CD34 immunohistochemistry

Normal chorionic villous vascularization is essential for the undisturbed development of pregnancy. Defective vasculogenesis may play a role in pathological pregnancy. To assess pathological chorionic villous vascularization, normal vascularization has to be defined first. Few data are available on this topic. The aim of this study was therefore to investigate normal chorionic villous vascularization in ultrasound-dated first trimester pregnancies from week 5 menstrual age to week 12 (n = 41), using quantitative CD34 immunohistochemistry. Two important processes in chorionic villous vascularization were quantitatively illustrated: (i) maturation, reflected by an increase of the total number of luminized vessels as opposed to non-luminized haemangioblastic cords and (ii) margination, due to a decrease of villous stromal area and an increase of total villous vascular area. The percentage of villous stromal area occupied by vascular elements (area difference %) increased from 0.7% in week 5-2.5% in week 10. Therefore, the area of the villous stroma occupied by vascular elements increases and the vessels are situated closer to the trophoblastic layer suitable for fetal-maternal exchange. There was also a trend in increased number of peripheral vessels (2.0 in week 5 to 4.6 in week 10), supporting both developmental mechanisms. In conclusion, in exactly dated normal human first trimester pregnancies, development of the chorionic villous vascular system seems to be mostly characterized by maturation of luminized vessels from primitive haemangioblastic cords, and margination to a situation of peripherally located vessels.      

血清反复冻融对HBsAg和抗HBs抗体检测的影响

0　引言　 EL ISA技术已在乙肝标志物的检测中已普遍应用 ,一般认为收集的血清应及时检测 .而在基层单位或在流行病学调查研究中 ,由于血标本收集不集中 ,或者有些标本常需检测多个指标而持续时间较长 ,因此 ,血清必须低温贮存一定时间或反复冻融后检测 ,而血清冻融对 EL ISA检测结果是否有影响尚不清楚 .为此 ,我们对 183份血清标本冻融前、冻融 3次、冻融 6次后的 HBs Ag和抗 - HBs进行了检测和分析比较 .1　材料和方法1.1　材料　 1999- 0 5收集西京医院门诊乙肝 5项检测血清183份 ,年龄、性别、诊断不限 .1.2　方法　于初次检测 …     

Close mapping of the focal non-epidermolytic palmoplantar keratoderma (PPK) locus associated with oesophageal cancer (TOC)

Focal non-epidermolytic palmoplantar keratoderma (PPK or palmoplantar ectodermal dysplasia type III) is associated with oesophageal cancer in three families: two large pedigrees located in Liverpool, UK and in the midwestern American states and one smaller family from Germany. In these families, the PPK is inherited as autosomal dominant and has a late onset, usually manifesting between 7 and 8 years of age. The disease is characterised by thickening of the pressure areas of the soles, but is not restricted to the feet and also presents with oral leukokeratosis and follicular hyperkeratosis. The disease locus [previously termed the "tylosis oesophageal cancer gene' (TOC) locus] has been mapped to 17q23-qter by linkage analysis. This region is located telomeric to the keratin 16 gene, in which mutations have been identified in focal PPK families who show no increased cancer risk. We describe the close mapping of this locus to the interval between AFMb054zf9 and D17S1603 using haplotype analysis of additional Genethon markers in the region and show that although the American family is unlikely to be related to either of the other two, the UK and German pedigrees may share a common descent. This work provides a basis for positional cloning and candidate gene analysis in order to identify a gene that may be involved in familial oesophageal cancer.      

成纤维细胞的力学生物学(上)

由于重力、血液的流动及运动的原因，人体会不断受到力的作用。众所周知，结缔组织是承受与传导力的器官，其内的细胞可以通过多种机制将力转化为生物化学信号，但是有些机制尚未完全了解。结缔组织的成纤维细胞就是对力产生反应的细胞，在力的作用下，会通过改变自身细胞外基质（extracellular matrix，ECM）的基因及蛋白质表达的方法维持组织的结构和功能（如创伤修复）。当结缔组织承受到较大的压力时，可以使结缔组织保持正常的功能和组织的动态平衡。结缔组织的修复及维持主要由间充质细胞或成纤维细胞来完成。力可以调节细胞的多种功能，如细胞增殖、基因表达及蛋白质分泌。     

Pulmonary edema: an MR study of permeability and hydrostatic types in animals

Permeability pulmonary edema was induced in ten rats by intravenous injection of oleic acid. Hydrostatic pulmonary edema was induced in another ten rats by continuous infusion of saline. Permeability pulmonary edema was detected as increased signal intensity in all animals on images obtained with repetition times (TR) of 2.0 sec and echo times (TE) of 28 and 56 msec. Hydrostatic pulmonary edema was perceivable only in seven of ten rats. It was best seen on spin-echo TR = 2.0 sec, TE = 28 msec images as increased intensity either throughout the whole lung or in a predominant central distribution. The slopes of the relationships between the mean signal intensity and water content of both lungs were lower for hydrostatic pulmonary edema than for permeability pulmonary edema. Hydrostatic pulmonary edema demonstrated similar T1 but markedly shorter T2 relaxation times than permeability edema. Magnetic resonance imaging can be used to estimate severity of hydrostatic and permeability pulmonary edemas.     

Peripapillary disciform lesions in the elderly

We present seven consecutive cases of peripapillary disciform lesions (PPDL) managed over a period of four and a half years. All patients were elderly, with a median age of 74 years. A protocol was used for the management of these patients. Four underwent ablative laser treatment when the lesion demonstrated growth and was sight threatening. The final visual acuity in this treated group improved by one line in one patient, was reduced by one line in two and was unchanged in the other. No recurrent lesions were seen beyond three months after treatment. The lesions in the remaining three patients were non-progressive and required no treatment. Of these, the final visual acuity remained unchanged in two patients and was reduced by one line in the other.     

乙型肝炎病毒感染

急性乙型肝炎感染乙型肝炎病毒(HBV)是非细胞致病性的。肝脏的损害是感染的肝细胞免疫溶解所致。在炎性浸润性细胞中,有自然杀伤(NK)和细胞毒性T细胞。在肝细胞表面有、病毒抗原。这些抗原协同Ⅰ类主要组织相容复合体(MHC)蛋白质,使这些细胞成为细胞毒性T细胞溶解的靶细胞。对慢性HBV感染病人的研究提示,乙型肝炎核心(C)和e抗原是免疫系统主要的靶抗原。肝细胞通常只表达微量Ⅰ类MHC糖蛋白,但在急性HBV感染早期,随着干扰素