溶血磷脂酸的病理生理作用与肾脏疾病

溶血磷脂酸(lysophosphatidicacid,LPA)是目前已知的结构最简单的甘油磷脂。LPA在体内信号传递过程中起着十分重要的作用,具有广泛的生物学活性,与细胞的增殖和凋亡、损伤和修复有密切关系。近年来的研究显示,LPA与肾脏疾病也有关。本文对LPA的基本情况及其与肾脏疾病的关系作一综述。

急性缺血性脑血管病血浆溶血磷脂酸和酸性磷脂水平的变化及意义

目的探讨急性缺血性脑血管病患者血浆溶血磷脂酸(LPA)及酸性磷脂(AP)水平变化及临床意义。方法急性缺血性脑血管病患者100例,根据脑血管病分类及临床诊断标准分为短暂性脑缺血发作组(TIA)、急性脑梗死组(ACI);健康体检者50例为对照组。分别测定发病24小时内血浆LPA、AP水平。结果 TIA组血浆LPA、AP值较ACI组、对照组明显增高,差异有统计学意义(P<0.01);ACI组较对照组明显增高,差异有统计学意义(P<0.01)。不同梗死面积3组间比较,大梗死灶组较中小梗死灶组LPA、AP增高,LPA分别为(5.33±1.09)μmol/L vs(4.82±0.96)μmol/L vs(2.22±0.61)μmol/L,AP(6.51±1.33)μmol/L vs(4.86±1.04)μmol/L vs(2.01±0.44)μmol/L,差异统计学意义(P<0.05或<0.01)。结论血浆LPA、AP水平与血小板活化、血栓形成的危险程度及梗死灶大小相关,可以作为急性缺血性脑血管病预警因子,对其防治有重要临床应用价值。

Inhibition of protein tyrosine phosphatase 1B activity by triterpenes isolated from Aceriphyllum rossii

An organic layer prepared from the seed of Aceriphyllum rossii was studied to identify the active compounds for protein tyrosine phosphatase 1B（PTP1B） inhibition.Bioassay guided fractionation resulted in the isolation of PTP1B inhibitory activity of triterpenes（1-4）.These four compounds were identified as aceriphyllic acid C（1）,aceriphyllic acid D（2）,aceriphyllic acid E（3） and aceriphyllic acid F（4）.The isolated 1-4 compounds inhibited PTP1B with IC50 values ranged from（2.1±1.5） μmol/L to（11.2±2.5） μmol/L.Kinetic analysis of PTP1B inhibition by aceriphyllic acid C（1） and aceriphyllic acid D（2） suggested that oleanane-type triterpenes inhibited PTP1B activity in a mixed-type manner.

Inhibition of protein tyrosine phosphatase 1B by triterpenes isolated from Potentilla discolor Bge

Seven oleanene triterpenes were isolated from the roots of Potentilla discolor Bge and their structures were identified as 3-oxoolean-12-en-27-oic acid（1）, gypsogenic acid（2）, 3α-hydroxyolean-12-en-27-oic acid（3）, 3β-hydroxyolean-12-en-27-oic acid（4）, aceriphyllic acid A（5）, aceriphyllic acid A methyl ester（6）, and oleanolic acid（7）. Compounds 1–7 inhibited protein tyrosine phosphatase 1B（PTP1B） activity, with IC50 values ranging from（7.5±0.5） to（22.7±0.5） μmol/L. Among the isolates, compounds 1, 2, 3 and 7 from the Potentilla discolor Bge were found to exhibit selective PTP1 B inhibitory activity.