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首页> 外文期刊>Journal of Cellular Physiology >Reciprocal regulation of tissue-type and urokinase-type plasminogen activators in the differentiation of murine preadipocyte line 3T3-L1 and the hormonal regulation of fibrinolytic factors in the mature adipocytes.
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Reciprocal regulation of tissue-type and urokinase-type plasminogen activators in the differentiation of murine preadipocyte line 3T3-L1 and the hormonal regulation of fibrinolytic factors in the mature adipocytes.

机译:相互监管的组织类型urokinase-type纤溶酶原激活物物分化的小鼠preadipocyte线3 t3-l1和激素调节在成熟的脂肪细胞纤溶因子。

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Adipose tissue expresses a variety of genes including tumor necrosis factor alpha and type-1 plasminogen activator inhibitor (PAI-1); and these factors, produced by adipocytes, may be associated with the risk of coronary events in obesity. In this study, we characterized the production of fibrinolytic factors including tissue-type plasminogen activator (tPA), urokinase-type PA (uPA), and PAI-1 in the differentiation of preadipocytes, and examined the hormonal regulation of these fibrinolytic factors in mature adipocytes. Mouse 3T3-L1 preadipocytes were employed as a model of adipocytes. Adipocyte differentiation was induced by insulin, dexamethasone, and 3-isobutyl-1-methyl xanthine (IBMX). alpha-Glycerophosphate dehydrogenase (GPDH) activity and glucose transporter 4 (GLUT4) mRNA, indices for adipocyte maturation, were induced on Day 4, and gradually increased. GPDH activity reached its maximum level on Day 14. The level of tPA, a major PA in preadipocytes, dramatically decreased with differentiation. On the other hand, that of uPA reciprocally increased. PAI-1 production was also dramatically induced concomitant with differentiation. In mature adipocytes, uPA production was dominant (25 microg/ml/24 h vs. 0.8 microg/ml/24 h for tPA). Total PA activity in the mature adipocytes was reduced by insulin or dexamethasone, but not by glucagon. Insulin, IBMX, and dexamethasone significantly decreased both uPA and tPA production, and increased PAI-1 production. Glucagon had no effect on the production of these fibrinolytic factors. Our results reveal that uPA is one of the markers for the differentiation of 3T3-L1 cells and that insulin, IBMX, and dexamethasone are potent regulators of the fibrinolytic activity in differentiated 3T3-L1 cells, reciprocally affecting PA and PAI-1 levels in them. Copyright 2001 Wiley-Liss, Inc.
机译:脂肪组织表达不同的基因包括肿瘤坏死因子α和1型纤溶酶原激活物抑制剂(PAI-1);这些因素,由脂肪细胞产生的可能与冠状动脉事件的风险有关肥胖。生产纤溶等因素组织类型纤溶酶原激活物(tPA),urokinase-type PA (uPA)和PAI-1分化preadipocytes和检查这些纤溶的激素调节因素在成熟的脂肪细胞。preadipocytes被作为模型脂肪细胞。胰岛素,地塞米松,3-isobutyl-1-methyl黄嘌呤(IBMX)。alpha-Glycerophosphate脱氢酶(GPDH)活动和葡萄糖转运蛋白4 (GLUT4) mRNA,指数脂肪细胞成熟,被诱导第四天,逐步增加。在14天达到最高级别。tPA,主要在preadipocytes PA,显著减少与分化。手,uPA相反地增加了。产量也显著诱导伴随的分化。脂肪细胞,uPA生产主导(25microg / ml / 24小时和0.8 microg tPA /毫升/ 24小时)。总PA成熟脂肪细胞的活动减少胰岛素或地塞米松,但是没有通过胰高血糖素。显著降低uPA和tPA生产,增加PAI-1生产。胰高糖素的生产没有影响纤溶因子。分化的标志之一吗3 t3-l1细胞和胰岛素、IBMX和地塞米松的有力监管机构纤溶活性3 t3-l1分化细胞,相反地影响PA和PAI-1水平在他们。

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