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排序方式: 共有675条查询结果,搜索用时 15 毫秒
81.
Raffaella M. Ravinetto Ambrose Talisuna Maaike De Crop Harry van Loen Joris Menten Chantal Van Overmeir Halidou Tinto Raquel Gonzalez Martin Meremikwu Carolyn Nabasuma Ghyslain M. Ngoma Corine Karema Yeka Adoke Mike Chaponda Jean‐Pierre Van geertruyden Umberto D'Alessandro 《Tropical medicine & international health : TM & IH》2013,18(2):237-241
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Elevated expression and altered pattern of activity of DNA methyltransferase in liver tumors of rats fed methyl-deficient diets 总被引:3,自引:1,他引:2
DNA methyltransferase (MTase) activity in nuclear extracts from neoplastic
and preneoplastic livers of rats fed a methyl-deficient diet (MDD) is
elevated compared with that seen in the livers of control rats. Nuclear
proteins were prepared in the presence of protease inhibitors including
trans-epoxy succinyl-L-leucylamido-(4- guanido)butane and were fractionated
by isoelectric focusing. In normal, control liver, two distinct MTase
fractions were observed. In MDD-induced malignant liver, a third fraction,
in addition to the previous two, was also seen. Both the DNA substrate and
the cytosine site specificities of the third MTase fraction differ from
those of the other two fractions. The distinct MTase activity in liver
tumor has significantly more de novo MTase activity than do the MTase
fractions of normal, control liver. Thus, normal and neoplastic rat livers
differ in DNA MTase fractionation patterns and site specificities. The
altered DNA MTase activity observed in rat liver tumors caused by MDDs may
be one of the critical factors contributing to cancer formation through
abnormal DNA methylation.
相似文献
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眩晕的诊断和治疗 总被引:2,自引:0,他引:2
眩晕是由于前庭系统(几乎总是周围性)疾病引起的一种旋转幻觉,任病也方面需要与晕厥的状态、癫痫和惊恐发作相鉴别。持续≥1d的急性孤立性自发性眩晕的单次发作通常由前庭神经炎或小脑梗死所致,两者的鉴别需熟练掌握转头试验(head impulse test)。反复发作性眩晕多见丁良性阵发性位置性眩晕(BPPV)、Meniere病和偏头痛。根据可靠的痫史、位置性试验、听力图和温度试验,一股可以鉴别以上3种疾病。BPPV是最常见的反复发作性眩晕的原因,颗粒复位法通常能够使之立即治愈。后循环缺血极少会导致孤立性眩晕发作,其导致的眩晕是短暂和反复发作的,且病程较短。 相似文献
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The number of receptors for factor VII correlates with the ability of cultured cells to initiate coagulation 总被引:1,自引:0,他引:1
Previously, we showed that cells derived from nonvascular tissues initiate clotting primarily by markedly increasing the activity of coagulation factor VII. Cells derived from vascular tissue do not normally exhibit this property (tissue factor activity). In this study, we have characterized the relationship between the tissue factor activity of cultured cells derived from normal tissues and the number of receptors they possess for coagulation factor VII. Only cultured nonvascular cells expressed tissue factor activity or possessed receptors for 125I-factor VII. Fetal lung cells, the nonvascular tissue with the largest amount of procoagulant and tissue factor activity, possessed the most receptors for 125I-factor VII (880,000/cell). Bovine corneal endothelial cells, the nonvascular tissue possessing the fewest number of receptors (2,400/cell), had the least amount of procoagulant or tissue factor activity. The affinity of nonvascular cells for 125I- factor VII varied for the cells studied (Kd congruent to 1.3-90 X 10(- 10) M). Vascular cells expressed no tissue factor activity, nor did they bind 125I-factor VII. 125I-factor VII and unlabeled factor VII bound to cells had identical procoagulant activities. These results indicate that the ability of cultured cells to initiate coagulation may be regulated in part by the number of receptors they possess for factor VII. 相似文献
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