Synthesis and Biological Evaluation of Asiatic Acid Derivatives as Inhibitors of Glycogen Phosphorylases
作者:Liying Zhang、Jun Chen、Yanchun Gong、Jun Liu、Luyong Zhang、Weiyi Hua、Hongbin Sun
DOI:10.1002/cbdv.200800092
日期:2009.6
Twenty-four asiaticacidderivatives have been synthesized and biologicallyevaluated as inhibitors of glycogenphosphorylase (GP). Within this series of compounds, asiaticacid benzyl ester (23; IC(50)=3.8 microM) exhibited more potent activity than its parent compound 1 (IC(50)=17 microM). SAR Analysis showed that asiaticacid (1) possessing a 2alpha-OH function exhibited more potent GP inhibitory
An Investigation of the Differential Effects of Ursane Triterpenoids from<i>Centella asiatica</i>, and Their Semisynthetic Analogues, on GABA<sub>A</sub>Receptors
作者:Kaiser Hamid、Irene Ng、Vikram J. Tallapragada、Linda Váradi、David E. Hibbs、Jane Hanrahan、Paul W. Groundwater
DOI:10.1111/cbdd.12766
日期:2016.9
The ursane triterpenoids, asiatic acid 1 and madecassic acid 2, are the major pharmacological constituents of Centella asiatica, commonly known as Gotu Kola, which is used traditionally for the treatment of anxiety and for the improvement of cognition and memory. Using the two‐electrode voltage‐clamp technique, these triterpenes, and some semisynthetic derivatives, were found to exhibit selective negative modulation of different subtypes of the GABAA receptor expressed in Xenopus laevis oocytes. Despite differing by only one hydroxyl group, asiatic acid 1 was found to be a negative modulator of the GABA‐induced current at α1β2γ2L,α2β2γ2L and α5β3γ2LGABAA receptors, while madecassic acid 2 was not. Asiatic acid 1 exhibited the greatest effect at α1β2γ2L (IC50 37.05 μm), followed by α5β3γ2L (IC50 64.05 μm) then α2β2γ2L (IC50 427.2 μm) receptors. Conversion of the carboxylic acid group of asiatic acid 1 to a carboxamide group (2α,3β,23‐trihydroxy‐urs‐12‐en‐28‐amide 5) resulted in enhanced inhibition at both the α1β2γ2L (IC50 14.07 μm) and α2β2γ2L receptor subtypes (IC50 28.41 μm). The results of this study, and the involvement of α5‐containing GABAA receptors in cognition and memory, suggest that asiatic acid 1 may be a lead compound for the enhancement of cognition and memory.
Synthesis of asiatic acid derivatives and their cytotoxic activity
作者:Loc Tran Van、Quynh Nhu Vo Thi、Chien Tran Van、Phuong Thao Tran Thi、Ninh Pham Thi、Thanh Nguyen Tuan、Thu Ha Le Thi、Nga Nguyen Thi、Thao Do Thi、Sung Tran Van
DOI:10.1007/s00044-018-2176-y
日期:2018.6
mouth), HepG2 (humanhepatocellularcarcinoma), and SK-LU-1 (human lung carcinoma). Eleven of the tested compounds, including nine newly synthesized and two known ones showed very strong activity against three tested cell lines with the IC50 values ranging from 0.67 to 37.39 µM. Three compounds showed good activity against KB and HepG2 cell lines with the IC50 values ranging from 1.95 to 32.12 µM. The activity