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Previous studies on cytoskeletal changes of in vitro and in vivo animal models of ischemic myocardium have suggested the possibility of using alterations in cytoskeleton proteins as an early marker for the post-mortem diagnosis of myocardial ischemia in cases of sudden death due to coronary artery disease (CAD). In the present study, using the technique of ABC-immunohistochemistry, we examine the changes of three cytoskeletal proteins: vinculin, desmin and α-actinin in human myocardial samples taken from 14 cases of CAD sudden death and 13 cases of non-CAD death. Results of these examinations are compared with immunohistochemical changes of myoglobin and histochemical staining of hematoxylin and eosin and phosphotungstic acid, and Masson trichrome. Patchy and extensive loss of the three cytoskeletal proteins was demonstrated in the myocardium of victims who died 1 h or later following the onset of symptoms of ischemic myocardium. The pattern of cytoskeleton change is equivocal in the cases of CAD who died less than 1 h after the onset of symptoms and of the cases of non-CAD. In these cases, no significant histological change was observed. With less non-specific background changes and stronger positive staining, immunohistochemical staining of the three cytoskeletal proteins is more reliable than myoglobin, which has attracted the attention of many pathologists searching for anatomic evidence of ischemic myocardium in coronary artery disease. 相似文献
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纤维连接蛋白在诊断心肌梗死的特异性研究 总被引:6,自引:1,他引:5
探讨纤维连接蛋白 (Fn)对心肌梗死死后诊断的特异性。应用免疫组织化学和图像分析技术 ,对正常心脏、心肌梗死及其它非梗死性因素 ,如心肌炎、窒息、电击死、出血性休克、心挫伤、有机磷中毒等 ,直接或间接引起心脏损害时心肌细胞内Fn的变化进行研究。结果发现 :Fn仅在心肌梗死与心肌炎病例出现阳性反应 ,其阳性反应面积同正常对照组存在显著性差异 ,在窒息、电击死、出血性休克、心挫伤、有机磷中毒等病例未见明显阳性反应。Fn作为心肌梗死死后诊断指标仅受心肌炎的影响 ,对诊断心肌梗死具有较好的特异性 相似文献
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c-fos蛋白及其基因表达改变用于脑干损伤早期死后诊断的可行性研究 总被引:4,自引:1,他引:3
探讨人体脑干损伤后c fos蛋白及其基因表达的改变用于脑干损伤早期死后诊断的可行性。采用免疫组织化学和原位杂交技术 ,观察 16例人体脑干损伤后的c fos蛋白及其基因表达的改变。结果发现 :在正常脑干组织的不同部位 ,均有c fos蛋白和c fos mRNA阳性表达 ,且在各例脑干标本之间 ,表达的量及其分布不一致。脑损伤后 ,在脑干组织中也有c fos蛋白和c fos mRNA阳性表达 ,但与正常脑干组织相比无显著性差异。c fos蛋白和c fos mRNA的表达在各例脑干标本之间不一致 ,且在损伤后的改变无明显规律 ,不能用于脑干损伤早期的死后诊断。 相似文献
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目的 探讨原癌基因c-fos蛋白的表达和脑干早期损伤的关系。方法 2 0只实验大鼠随机分为脑干损伤组和对照组 ,脑干早期损伤阶段c-fos蛋白表达采用原位杂交组化法观察。结果 对照组大鼠脑干组织未见c-fosmRNA的表达。然而 ,脑干损伤组损伤后 1 0min即可在神经元和胶质细胞观察到c-fosmRNA的表达。且在脑干损伤后 3h内 ,c-fosmRNA的表达程度出现明显的时间依存性。脑干组织死后伤c -fosmRNA的表达亦为阴性。结论 c-fos原癌基因的检测可成为诊断脑干生前损伤的一项指标。 相似文献
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Hajime Nishio Kiyoshi Matsui Hiroko Tsuji Akiyoshi Tamura Koichi Suzuki 《Forensic Science International Supplement Series》2000,110(3):488
Thymic involution has been reported to be an important parameter of the degree and duration of child abuse. In the present study, we assessed the status of tyrosine phosphorylation signaling, which is known to play a key role in the physiological function of the thymus, in involuted thymuses of abused children through immunohistological studies performed with anti-phosphotyrosine antibodies. We found that tyrosine-phosphorylated proteins were present in high amounts in Hassall’s corpuscles (HC) in the medulla of control thymuses. In involuted thymuses of abused children, expression of tyrosine-phosphorylated proteins was reduced with accompanying morphological changes of HC, such as reduction in size or calcification. These findings lead us to the suggestion that tyrosine phosphorylation signaling is reduced in involuted thymuses of abused children and that reduction of the signaling may be associated with morphological changes of HC as observed in involuted thymuses of abused children. In order to certify the suggestion, we investigated expression of tyrosine-phosphorylated proteins in involuted thymuses of stressed rats as well as in control thymuses. Immunohistochemistry revealed that tyrosine-phosphorylated proteins were expressed in control thymuses, more abundantly in the medulla, and reduced remarkably in involuted thymuses of stressed rats. Further, immunoblot analysis also showed that expression of phosphotyrosine-containing proteins was reduced in thymus extracts of involuted thymuses of stressed rats, thus supporting the suggestion. Our results also raise the possibility that components of tyrosine phosphorylation signaling could be a molecular marker for thymic involution. 相似文献