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Mechanisms of antihyperglycemic effect of p-methoxycinnamic acid in normal and streptozotocin-induced diabetic rats

机译:对甲氧基肉桂酸在正常和链脲佐菌素诱导的糖尿病大鼠中的降血糖作用机理

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We investigated the antihyperglycernic effect of p-methoxycinnamic acid (p-MCA), a cinnamic acid derivative, on plasma glucose and insulin concentrations, activities of hepatic glucose-regulating enzymes and hepatic glycogen content in normal and streptozotocin (STZ)-induced diabetic rats. p-MCA (10 - 100 mg/kg, PO) dose-dependently decreased plasma glucose concentration in both normal and diabetic rats in the oral glucose tolerance test. To investigate the chronic effects of p-MCA on glucose metabolism, p-MCA (40 mg/kg, PO) was administered to normal and diabetic rats once a day for 4 weeks. p-MCA reduced plasma glucose concentration in diabetic rats, which was observed during the 4-week study. However, p-MCA treatment did not change plasma glucose concentrations in normal rats during the 4-week study. p-MCA also reduced the excessive activities of hepatic glucose-6-phosphatase, hepatic hexokinase, glucokinase and phosphofructokinase in diabetic rats and increased hepatic glycogen in these rats. In p-MCA-treated normal rats, there were no changes in the activities of hepatic glucose-regulating enzymes, hepatic glycogen and glucose-6-phosphate. Our findings suggested that p-MCA exert its antihyperglycernic effect by increasing insulin secretion and glycolysis, and by decreasing gluconeogenesis. (c) 2005 Elsevier Inc. All rights reserved.
机译:我们研究了肉桂酸衍生物对甲氧基肉桂酸(p-MCA)对正常和链脲佐菌素(STZ)诱导的糖尿病大鼠血浆葡萄糖和胰岛素浓度,肝葡萄糖调节酶活性以及肝糖原含量的抗高甘油作用。在口服葡萄糖耐量试验中,正常和糖尿病大鼠中p-MCA(10-100 mg / kg,PO)剂量依赖性降低血浆葡萄糖浓度。为了研究p-MCA对葡萄糖代谢的慢性影响,每天对正常和糖尿病大鼠给药p-MCA(40 mg / kg,PO),持续4周。在为期4周的研究中,p-MCA降低了糖尿病大鼠的血浆葡萄糖浓度。然而,在4周的研究中,p-MCA处理并未改变正常大鼠的血浆葡萄糖浓度。 p-MCA还减少了糖尿病大鼠肝葡萄糖6磷酸酶,肝己激酶,葡萄糖激酶和果糖磷酸激酶的过度活性,并增加了这些大鼠的肝糖原。在经p-MCA处理的正常大鼠中,肝葡萄糖调节酶,肝糖原和6-磷酸葡萄糖的活性没有变化。我们的发现表明,p-MCA通过增加胰岛素分泌和糖酵解以及减少糖异生来发挥其抗高甘油酸作用。 (c)2005 Elsevier Inc.保留所有权利。

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