目的研究多管藻总酚(total phenols from Polysiphonia urceolata,TPPU)对正常小鼠和四氧嘧啶糖尿病小鼠糖耐量及空腹血糖的影响,并探讨其降糖作用机制。方法观察TPPU对α-葡萄糖苷酶活性的体外抑制作用;测定TPPU对蛋白质酪氨酸磷酸酯酶...目的研究多管藻总酚(total phenols from Polysiphonia urceolata,TPPU)对正常小鼠和四氧嘧啶糖尿病小鼠糖耐量及空腹血糖的影响,并探讨其降糖作用机制。方法观察TPPU对α-葡萄糖苷酶活性的体外抑制作用;测定TPPU对蛋白质酪氨酸磷酸酯酶1B(PTP1B)抑制活性;正常小鼠ig给药,测定空腹血糖和糖耐量;四氧嘧啶致糖尿病小鼠模型ig给药,测定空腹血糖及糖耐量。结果TPPU15g/L能够显著抑制α-葡萄糖苷酶的活性,抑制率达75.12%;有明显的体外抑制PTP1B活性的作用,其IC50为5.7μmol/L;TPPU对正常小鼠无降血糖作用,但可使糖耐量曲线趋于平缓;能够显著提高四氧嘧啶致糖尿病小鼠糖耐量,降低实验性糖尿病小鼠的空腹血糖。结论TPPU具有一定的降血糖作用。展开更多
Protein tyrosine phosphatase 1B （PTP1B） plays an important role as a negative regulator and has been proved to be an effective target for the treatment of type 2 diabetes mellitus. Bis-（2,3-dibromo-4,5-dihydroxyphe...Protein tyrosine phosphatase 1B （PTP1B） plays an important role as a negative regulator and has been proved to be an effective target for the treatment of type 2 diabetes mellitus. Bis-（2,3-dibromo-4,5-dihydroxyphenyl）-methane 7 was first reported as a natural bromophenol with significant inhibition against PTP1B which was isolated from red algae Rhodomela conrervoides. Intrigued by its astonishing activity （IC50 = 2.4 μmol/L）, compound 7 was synthesized with the overall yield of 24% and evaluated for its PTPIB inhibitory activity compared with natural compound.展开更多
文摘目的研究多管藻总酚(total phenols from Polysiphonia urceolata,TPPU)对正常小鼠和四氧嘧啶糖尿病小鼠糖耐量及空腹血糖的影响,并探讨其降糖作用机制。方法观察TPPU对α-葡萄糖苷酶活性的体外抑制作用;测定TPPU对蛋白质酪氨酸磷酸酯酶1B(PTP1B)抑制活性;正常小鼠ig给药,测定空腹血糖和糖耐量;四氧嘧啶致糖尿病小鼠模型ig给药,测定空腹血糖及糖耐量。结果TPPU15g/L能够显著抑制α-葡萄糖苷酶的活性,抑制率达75.12%;有明显的体外抑制PTP1B活性的作用,其IC50为5.7μmol/L;TPPU对正常小鼠无降血糖作用,但可使糖耐量曲线趋于平缓;能够显著提高四氧嘧啶致糖尿病小鼠糖耐量,降低实验性糖尿病小鼠的空腹血糖。结论TPPU具有一定的降血糖作用。
基金the National Center for Drug Screening (Shanghai,PR China) for supplying data on PTP1B inhibitory activities of compoundssupported by the National 863 projects (Nos.2007AA09Z410 and 2007AA091604).
文摘Protein tyrosine phosphatase 1B （PTP1B） plays an important role as a negative regulator and has been proved to be an effective target for the treatment of type 2 diabetes mellitus. Bis-（2,3-dibromo-4,5-dihydroxyphenyl）-methane 7 was first reported as a natural bromophenol with significant inhibition against PTP1B which was isolated from red algae Rhodomela conrervoides. Intrigued by its astonishing activity （IC50 = 2.4 μmol/L）, compound 7 was synthesized with the overall yield of 24% and evaluated for its PTPIB inhibitory activity compared with natural compound.
