Two new saponins named mongholicoside A （1） and mongholicoside B （2） were isolated from the aerial part of Astragalus membranaceus var mongholicus. Their structures were determined by 1D and 2D NMR, ESI-MS techniq...Two new saponins named mongholicoside A （1） and mongholicoside B （2） were isolated from the aerial part of Astragalus membranaceus var mongholicus. Their structures were determined by 1D and 2D NMR, ESI-MS techniques and chemical methods.展开更多
Objective Many Asian countries including China,Japan and Korea have very high incidence of gastric cancer,in which about 42% cases occur in China's Mainland.The precise targets and underlying mechanisms are not we...Objective Many Asian countries including China,Japan and Korea have very high incidence of gastric cancer,in which about 42% cases occur in China's Mainland.The precise targets and underlying mechanisms are not well understood.Our previous study revealed that Astragalus saponins(AST)showed promising effects on the suppression of the growth of HT-29 human colon cancer cells and tumor xenograft by inhibiting cell proliferation and promoting apoptosis.In the present study,we investigated the anti-carcinogenic effects of AST in AGS human gastric adenocarcinoma cells and attempted to elucidate the underlying mechanisms.Methods Growth inhibition of AGS cells was determined by using the MTT viability test.Involvement of different members of the apoptotic cascade and other growth-related factors was explored by assessment of their protein expression using Western blot analysis.Distribution of cells in different phases of the cell cycle was assessed by flow cytometry.Results Our data indicate that AST induced growth-inhibition and apoptosis in AGS cells by activating caspase 3 with subsequent poly(ADP-ribose)polymerase(PARP)cleavage.Cell cycle arrest at the G2/M phase had been observed in AST-treated AGS cells.The anti-proliferative effect of AST was associated with modulation of cyclin B1 and p21.We then demonstrate that AST could downregulate the expression of VEGF,of which interaction with its receptors is important for angiogenesis during tumor formation.Conclusions Our findings suggest that AST is an effective agent in gastric cancer treatment by inducing cell cycle arrest and apoptosis,of which anti-angiogenesis could be an alternative mode of action.展开更多
Saponin mixture, obtained from Astragalus monspessulanus subsp. monspessulanus (Fabaceae) was investigated for possible protective effect on tert-butyl hydroperoxide (t-BuOOH)-induced cytotoxicity using primary isolat...Saponin mixture, obtained from Astragalus monspessulanus subsp. monspessulanus (Fabaceae) was investigated for possible protective effect on tert-butyl hydroperoxide (t-BuOOH)-induced cytotoxicity using primary isolated rat hepatocytes. The cells were isolated by two-stepped col-lagenase perfusion. Liver damage was induced by one hour incubation with t-BuOOH (75 μmol·L-1) and discerned by decreased cell viability, increased lactate dehydrogenase (LDH) leakage into the medium, increased production of malondialdehyde (MDA) and depletion of the cell protector glutathione (GSH). Cell pre-incubation with the saponin mixture (1 mg/mL and 5 mg/mL) significantly (p < 0.05) ameliorated t-BuOOH-induced liver damage, judged by preserved cell viability, decreased activity of LDH, decreased MDA production and restoration of GSH. The effect was concentration-dependent, more pronounced in the highest concentration and comparable with those of silymarin, used as a positive control. The observed cytoprotective effect could be explained by the influence of the saponins on the mitochondrial function, disturbed by t-BuOOH toxic metabolites.展开更多
As a traditional Chinese medicine,the root of Astragalus membranaceus var.mongholicus(AMM)or A.membranaceus(AM)has been widely used in China and other Asian countries for thousands of years.Till now,the flavonoids,phe...As a traditional Chinese medicine,the root of Astragalus membranaceus var.mongholicus(AMM)or A.membranaceus(AM)has been widely used in China and other Asian countries for thousands of years.Till now,the flavonoids,phenolic acids and saponins are considered as the main active components contributing to their therapeutic effect in these plants.In order to clarify the distribution and contents of these compounds in different organs of these plants,a rapid and sensitive analytical method for simultaneous determination of 25 active compounds including seven types(i.e.dihydroflavones,isoflavane,isoflavones,flavones,pterocarpans,phenolic acid and saponins)within 10 min was established using ultra-pressure liquid chromatography coupled with tandem mass spectrometry(UPLCeMS/MS).Then,the established method was fully validated and successfully applied to the determination of the contents of these analytes in different parts(root,rhizome,stem,leaf and flower)of AMM and AM.The results indicated that the contents of the same type of compounds in two different species plants were significantly different.Moreover,the obvious differences were also found for the distribution and contents of different type of compounds in five organs of the same species.The present study could provide necessary information for the rational development and utilization of AMM and AM resource.展开更多
基金This research was financially supported by the key program of National Natural Science Foundation of China （No. 30530870）.
文摘Two new saponins named mongholicoside A （1） and mongholicoside B （2） were isolated from the aerial part of Astragalus membranaceus var mongholicus. Their structures were determined by 1D and 2D NMR, ESI-MS techniques and chemical methods.
文摘Objective Many Asian countries including China,Japan and Korea have very high incidence of gastric cancer,in which about 42% cases occur in China's Mainland.The precise targets and underlying mechanisms are not well understood.Our previous study revealed that Astragalus saponins(AST)showed promising effects on the suppression of the growth of HT-29 human colon cancer cells and tumor xenograft by inhibiting cell proliferation and promoting apoptosis.In the present study,we investigated the anti-carcinogenic effects of AST in AGS human gastric adenocarcinoma cells and attempted to elucidate the underlying mechanisms.Methods Growth inhibition of AGS cells was determined by using the MTT viability test.Involvement of different members of the apoptotic cascade and other growth-related factors was explored by assessment of their protein expression using Western blot analysis.Distribution of cells in different phases of the cell cycle was assessed by flow cytometry.Results Our data indicate that AST induced growth-inhibition and apoptosis in AGS cells by activating caspase 3 with subsequent poly(ADP-ribose)polymerase(PARP)cleavage.Cell cycle arrest at the G2/M phase had been observed in AST-treated AGS cells.The anti-proliferative effect of AST was associated with modulation of cyclin B1 and p21.We then demonstrate that AST could downregulate the expression of VEGF,of which interaction with its receptors is important for angiogenesis during tumor formation.Conclusions Our findings suggest that AST is an effective agent in gastric cancer treatment by inducing cell cycle arrest and apoptosis,of which anti-angiogenesis could be an alternative mode of action.
文摘Saponin mixture, obtained from Astragalus monspessulanus subsp. monspessulanus (Fabaceae) was investigated for possible protective effect on tert-butyl hydroperoxide (t-BuOOH)-induced cytotoxicity using primary isolated rat hepatocytes. The cells were isolated by two-stepped col-lagenase perfusion. Liver damage was induced by one hour incubation with t-BuOOH (75 μmol·L-1) and discerned by decreased cell viability, increased lactate dehydrogenase (LDH) leakage into the medium, increased production of malondialdehyde (MDA) and depletion of the cell protector glutathione (GSH). Cell pre-incubation with the saponin mixture (1 mg/mL and 5 mg/mL) significantly (p < 0.05) ameliorated t-BuOOH-induced liver damage, judged by preserved cell viability, decreased activity of LDH, decreased MDA production and restoration of GSH. The effect was concentration-dependent, more pronounced in the highest concentration and comparable with those of silymarin, used as a positive control. The observed cytoprotective effect could be explained by the influence of the saponins on the mitochondrial function, disturbed by t-BuOOH toxic metabolites.
基金supported by the National Natural Science Foundation of China(No.81473538,81873189)the Key R&D Program of Ningxia Hui Autonomous Region,China(2017BY079,2018ZWYQ0077)China Agricultural Research System(CARS-21)
文摘As a traditional Chinese medicine,the root of Astragalus membranaceus var.mongholicus(AMM)or A.membranaceus(AM)has been widely used in China and other Asian countries for thousands of years.Till now,the flavonoids,phenolic acids and saponins are considered as the main active components contributing to their therapeutic effect in these plants.In order to clarify the distribution and contents of these compounds in different organs of these plants,a rapid and sensitive analytical method for simultaneous determination of 25 active compounds including seven types(i.e.dihydroflavones,isoflavane,isoflavones,flavones,pterocarpans,phenolic acid and saponins)within 10 min was established using ultra-pressure liquid chromatography coupled with tandem mass spectrometry(UPLCeMS/MS).Then,the established method was fully validated and successfully applied to the determination of the contents of these analytes in different parts(root,rhizome,stem,leaf and flower)of AMM and AM.The results indicated that the contents of the same type of compounds in two different species plants were significantly different.Moreover,the obvious differences were also found for the distribution and contents of different type of compounds in five organs of the same species.The present study could provide necessary information for the rational development and utilization of AMM and AM resource.
