HPN, a Synthetic Analogue of Bromophenol from Red Alga Rhodomela confervoides: Synthesis and Anti-Diabetic Effects in C57BL/KsJ-db/db Mice
作者:Dayong Shi、Shuju Guo、Bo Jiang、Chao Guo、Tao Wang、Luyong Zhang、Jingya Li
DOI:10.3390/md11020350
日期:——
3,4-Dibromo-5-(2-bromo-3,4-dihydroxy-6-(isopropoxymethyl)benzyl)benzene-1,2-diol (HPN) is a synthetic analogue of 3,4-dibromo-5-(2-bromo-3,4-dihydroxy-6-(ethoxymethyl)benzyl)benzene-1,2-diol (BPN), which is isolated from marine red alga Rhodomela confervoides with potent protein tyrosine phosphatase 1B (PTP1B) inhibition (IC50 = 0.84 μmol/L). The in vitro assay showed that HPN exhibited enhanced inhibitory activity against PTP1B with IC50 0.63 μmol/L and high selectivity against other PTPs (T cell protein tyrosine phosphatase (TCPTP), leucocyte antigen-related tyrosine phosphatase (LAR), Src homology 2-containing protein tyrosine phosphatase-1 (SHP-1) and SHP-2). The results of antihyperglycemic activity using db/db mouse model demonstrated that HPN significantly decreased plasma glucose (P < 0.01) after eight weeks treatment period. HPN lowered serum triglycerides and total cholesterol concentration in a dose-dependent manner. Besides, both of the high and medium dose groups of HPN remarkably decreased HbA1c levels (P < 0.05). HPN in the high dose group markedly lowered the insulin level compared to the model group (P < 0.05), whereas the effects were less potent than the positive drug rosiglitazone. Western blotting results showed that HPN decreased PTP1B levels in pancreatic tissue. Last but not least, the results of an intraperitoneal glucose tolerance test in Sprague–Dawley rats indicate that HPN have a similar antihyperglycemic activity as rosiglitazone. HPN therefore have potential for development as treatments for Type 2 diabetes.
3,4-二溴-5-(2-溴-3,4-二羟基-6-(异丙氧基甲基)苄基)苯-1,2-二醇(HPN)是从海洋红藻Rhodomela confervoides中分离出来的3,4-二溴-5-(2-溴-3,4-二羟基-6-(乙氧基甲基)苄基)苯-1,2-二醇(BPN)的合成类似物,具有强效的蛋白酪氨酸磷酸酶1B(PTP1B)抑制作用(IC50 = 0.84 μmol/L)。体外试验表明,HPN对PTP1B的抑制活性增强,IC50为0.63 μmol/L,对其他PTP(T细胞蛋白酪氨酸磷酸酶(TCPTP)、白细胞抗原相关酪氨酸磷酸酶(LAR)、Src同源2蛋白酪氨酸磷酸酶-1(SHP-1)和SHP-2)具有高选择性。使用db/db小鼠模型进行的抗高血糖活性试验结果表明,HPN在8周的治疗期后显著降低了血浆葡萄糖(P < 0.01)。HPN以剂量依赖的方式降低了血清甘油三酯和总胆固醇浓度。此外,高剂量