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101.
J A Ding H Hashimoto T Sugimoto M Tsuneyoshi M Enjoji 《Acta pathologica japonica》1990,40(10):744-754
Six cases of Bednar tumor were analyzed clinicopathologically along with a review of 39 published cases. The findings were then compared with data on 44 cases of ordinary dermatofibrosarcoma protuberans (DFSP) obtained from our files. The clinical manifestations of the patients and the anatomic locations of the tumors were similar between the two categories, but the rate of recurrence was lower in cases of Bednar tumor. The histologic pattern of Bednar tumor was indistinguishable from ordinary DFSP except for scattered melanosome-containing cells. Ultrastructural and immunohistochemical examinations showed no evidence of neuroectodermal differentiation of dominant spindle-shaped cells in Bednar tumor, supporting a fibroblastic line of differentiation. The origin and pathogenesis of the melanosome-containing cells were considered. These cells failed to react with HMB-45, a melanoma-specific antibody, and the large majority of melanosomes present were mature or at Stage IV, plus a few immature ones at Stage II. These pigmented cells do not appear to be neoplastic, and cannot be used as proof to indicate that Bednar tumor is a neuroectodermal neoplasm. 相似文献
102.
Ping Zhang Zhenhua Sun Guang Li Yugang Zhuang Mengxiam Ding Zhiliu Feng 《Macromolecular chemistry and physics.》1993,194(7):1871-1877
The structure and miscibility of polyimide PBPI-E/PTI-E blends were studied by wide- and small-angle X-ray scattering and dynamic mechanical analysis, where PBPI-E is a biphenyldianhydride-based polyimide, and PTI-E is a polyimide from 4,4′-thiodiphthalic anhydride and 4,4′-oxydianiline. The results obtained show that there exists a paracrystalline structure in the blends with high content of PBPI-E, but this does not affect the miscibility of the blends. The blends are miscible over the entire composition range, since only one Tg was observed for each blend. Meanwhile, the segregation of PTI-E during crystallization of PBPI-E in the blends is interlamellar. 相似文献
103.
经皮穿刺椎间盘髓核摘除术入路的研究 总被引:1,自引:0,他引:1
为提供椎间盘髓核摘除术形态学依据,在7具成人横断面标本上观察测量了L1~L5椎间盘平面经皮穿刺椎间盘髓核摘除术的进针点、角度和深度。发现在L1~L3、L4~L5椎间盘髓核的穿刺点以距后正中线8~10cm,9~11cm,穿刺角度以46.7°~59.5°,穿刺深度为110.2~128.9mm为最宜。 相似文献
104.
Mercan R; Mayer JF; Walker D; Jones S; Oehninger S; Toner JP; Muasher SJ 《Human reproduction (Oxford, England)》1997,12(9):1886-1889
The aim of this study was to compare the efficacy of pure follicle
stimulating hormone (FSH) with that of FSH/human menopausal gonadotrophin
(HMG) combination in downregulated cycles. A total of 357 patients was
evaluated retrospectively. Sixty percent of patients in the FSH group and
55% in the FSH/HMG group were new; the others were repeat patients.
Ovulation was suppressed with leuprolide acetate in all patients, followed
by either FSH (n = 218) or FSH/HMG (n = 119). There was no difference in
patients' age, infertility factors, number of ampoules used, length of
stimulation, oestradiol levels on day of human chorionic gonadotrophin
(HCG) administration, number of oocytes recovered or the number of embryos
transferred. Also, nuclear maturity at aspiration and fertilization rates
were not different between the two groups. FSH stimulation resulted in a
significantly higher percentage of mature oocytes that showed the typical
'mature' morphological characteristics (P < 0.0001). The clinical
pregnancy rates per transfer were 40 and 28% in patients stimulated with
pure FSH and FSH/HMG respectively (P < 0.05). The significantly higher
number of immature oocytes matured in vitro in the FSH/HMG group (P =
0.001) suggests a possible effect on in-vitro maturation, due to
luteinizing hormone present in HMG. The difference in mature oocyte quality
may be an important determinant in the higher pregnancy rates for the FSH-
stimulated patients.
相似文献
105.
Bai Y Ding Y Spencer S Lasky LA Bromberg JS 《Experimental and molecular pathology》2001,71(2):115-124
Prominent in T cells and natural killer cells, CD2 binding protein 1 (CD2BP1) plays an important role in CD2-mediated adhesion and signal transduction. In the current study, we investigated CD2 and PSTPIP (proline, serine, threonine phosphatase interacting protein, murine homologue of CD2BP1) interactions in purified mouse splenic T cells. PSTPIP associated with CD2 in both resting and activated T cells. Following various stimuli, such as concanavalin A, anti-TCRbeta, anti-CD3epsilon, anti-CD3epsilon/phorbol myristate acetate (PMA), IL-2, or PMA/ionomycin, PSTPIP and CD2 expression, as well as their association, increased in a time-dependent fashion. While PSTPIP expression and CD2 expression were comparable across most groups, the PSTPIP-CD2 association stimulated by anti-CD3epsilon alone was significantly greater than with other stimuli. Stimulation by anti-CD3epsilon plus anti-CD28 induced even greater PSTPIP-CD2 association than anti-CD3epsilon treatment alone, indicating that CD28 initiated signals are involved in regulating this interaction. There was no direct association between CD3epsilon or CD28 and PSTPIP. Tyrosine phosphorylated PSTPIP bound poorly to CD2 compared to dephosphorylated PSTPIP, and protein tyrosine phosphatase was shown to affect both phosphorylation of PSTPIP and the CD2-PSTPIP association. In addition to CD2, PSTPIP associated with CD4, CD8, CD54, and CD62L. CD2 and CD4 ligation reciprocally regulated their association with PSTPIP. These findings indicate that T cell activation, particularly through the CD3 and CD28 signal transduction pathways, regulates PSTPIP-CD2 interactions. PSTPIP likely has additional broader effects through interactions with CD4, CD8, CD54, and CD62L, and this may influence T cell responses to antigen. 相似文献
106.
对73例门诊Ⅱ度烧伤病人行清创后辐照猪皮一次性覆盖,不需任何其他附加治疗。结果表明,烧伤剖面平均愈合时间只需7天.治愈率达92%,愈合剖面光滑整洁。这一疗法,不仅减轻了因多次换药给病人带来恐惧、痛苦和经济负担,也减少了医生的工作负荷。我们认为:在基层医疗单位,用辐照猪皮覆盖Ⅱ度烧伤剖面是行之有效的治疗方法。 相似文献
107.
Yang BZ Ding JH Zhou C Dimachkie MM Sweetman L Dasouki MJ Wilkinson J Roe CR 《Molecular genetics and metabolism》2000,69(3):259-262
A novel mutation was identified in two unrelated patients with medium-chain acyl-CoA dehydrogenase deficiency. First, a 19-year-old Caucasian female presented with a devastating illness, resulting in sudden death in adulthood which is unusual. The second patient, now a 3.5-year-old male, presented at 17 months of age with a hypoglycemic seizure and dehydration. Sequence analysis revealed a novel mutation G617T in exon 8 resulting in an arginine to leucine substitution at codon 206 (R206L). Both patients were compound heterozygous for this G617T and the common mutation A985G. 相似文献
108.
The emerging role of immunoregulation of fibrinogen-related procoagulant Fgl2 in the success or spontaneous abortion of early pregnancy in mice and humans. 总被引:12,自引:0,他引:12
D A Clark J W Ding G Chaouat C B Coulam C August G A Levy 《American journal of reproductive immunology (New York, N.Y. : 1989)》1999,42(1):37-43
PROBLEM: Abortion of chromosomally normal embryos in the CBA X DBA/2 mating combination is triggered by release of Th1 cytokines (tumor necrosis factor [TNF]-alpha, interferon [IFN]-gamma, and interleukin [IL]-1), which cause abortion via a novel prothrombinase, Fgl2, and polymorphonuclear leukocytes. The site of activation may be maternal vascular endothelium on arteries and veins nourishing the placenta. Activation of coagulation is also prominent in spontaneous abortion of chromosomally normal human embryos. We asked where is Fgl2 up-regulated in the uterus in murine abortions, and if similar Fgl2 expression occurs in human pregnancy failure. METHODS: Control CBA X DBA/2 pregnant mice, or from mice injected with TNF-alpha + IFN-gamma on day 7.5 of gestation, were removed on day 8.5, fixed, sectioned, and subject to in situ hybridization for Fgl2. Sections were also stained for fibrin. Elective first trimester termination samples or biopsies taken early in the course of a recurrent miscarriage were similarly fixed, sectioned, and analyzed by in situ hybridization. Control and cytokine-treated mice were anticoagulated with heparin, an activator of antithrombin III, and/or the direct anti-thrombin inhibitor hirudin. RESULTS: Low level Fgl2 expression localized to basal decidua remote from the embryo was noted in control mice; cytokine treatment, which causes greater than 80% of abortions, produced a striking up-regulation in this area as well as in a band at the junction of decidua and myometrium. Trophoblast also became strikingly positive. Fgl2 expression was associated with increased fibrin staining. Anticoagulation significantly protected against abortions, but doses were limited by the complication of retroplacental hemorrhage. In tissue from normal first trimester pregnancy, minimal Fgl2 positivity was seen in some villous syncytiotrophoblast, in villous stroma, cytotrophoblast, and in some cells in decidua. In spontaneous abortion of normal embryo, striking Fgl2 positivity was seen in syncytiotrophoblast and extravillous cytotrophoblast, in association with areas of thrombus formation. CONCLUSIONS: Fgl2 appears to be physiologically expressed and may protect against the internal danger of maternal and/or fetal bleeding during pregnancy and at parturition; a role in inhibiting transplacental traffic is also possible. External dangers in the form of stress, endotoxin, and antigens eliciting Th1 cytokine responses upregulate Fgl2 prothrombinase in trophoblast as well as in decidua, which results in spontaneous abortion of immunogenetically "weaker" embryos. 相似文献
109.
唾液酸化的路易斯寡糖—X抗原在结直肠癌细胞系LoVo,HT29?… 总被引:1,自引:0,他引:1
目的 探讨唾液酯化的路易期寡糖-X(SLeX)抗原的表达与结直肠癌转移潜能的相关性。方法 采用原位分子杂交技术,检测结直肠癌细胞表面SLeX抗原合成酶--α1,3岩藻糖转移酶(α1,3Fuc-T)在高、低转移民生结直肠癌细胞系LoVo、HT29细胞内的mRNA水平的表达,并应用免疫组化LSAB法,流式细胞仪,从定性、定量两个方面直接检测SLeX抗原在LoVo、HT29细胞内蛋白水平的表达。结果 高 相似文献
110.
大鼠再生肝对二乙基亚硝胺启动作用的敏感性 总被引:2,自引:0,他引:2
目的比较再生肝和正常肝对二乙基亚硝胺(DEN)启动作用的敏感性。方法以2/3肝叶切除后8周末的大鼠为实验组,正常大鼠为对照组,作如下比较:肝重、常规组织学检查及3H-TdR掺入试验;用修改的Solt-Farber模型,通过对GGT阳性癌前病灶的体视学测量,观察肝脏对DEN的启动效应;在体内和体外(无血清原代培养肝细胞)经DEN攻击后,以核酸原位缺口标记方法观察肝细胞DNA的损伤程度。结果2/3肝叶切除后8周末的实验组肝脏的修复过程已完成,未见肝细胞继续增生的表现;经DEN攻击后,实验组肝癌前病灶在数密度和体积密度上都显著高于对照组;无论在体内或体外接受DEN攻击后,实验组肝细胞DNA的损伤程度都显著大于对照组。结论即使再生过程已经完成,再生肝仍比正常肝具有较高的致癌敏感性,这与再生肝肝细胞在DEN攻击后其DNA损伤较重相关。 相似文献