[Objectives]To study the antioxidant activity of different solvent extracts of Gynura segetum in vitro,so as to provide experimental basis for further study and utilization of medicinal resources of G.segetum.[Methods...[Objectives]To study the antioxidant activity of different solvent extracts of Gynura segetum in vitro,so as to provide experimental basis for further study and utilization of medicinal resources of G.segetum.[Methods]The antioxidant activity of different solvent extracts of G.segetum was determined by UV-vis spectrophotometer using DPPH free radical scavenging method and ABTS^+free radical scavenging method.[Results]The scavenging rates of DPPH and ABTS^+by acetone extract were high,reaching 98.9%and 98.3%,respectively;the scavenging rate of DPPH and ABTS^+by water extract was the lowest,and the scavenging rates were 76.7%and 77.5%,respectively.The order of ABTS^+radical scavenging rate of samples extracted with different extractants was as follows:S 5(acetone extract)>S 1(ethyl acetate extract)>S 6(ethanol extract)>S 4(n-butanol extract)>S 3(methanol extract)>S 2(distilled water extract);the order of DPPH radical scavenging rate of samples extracted with different extractants was as follows:S 5(acetone extract)>S 1(ethyl acetate extract)>S 4(n-butanol extract)>S 6(ethanol extract)>S 3(methanol extract)>S 2(distilled water extract).[Conclusions]The extracts of acetone,ethyl acetate,n-butanol,anhydrous ethanol,methanol and distilled water from the roots of G.segetum had obvious scavenging effects on DPPH and ABTS^+,all had antioxidant components,and acetone had the highest antioxidant effect as an extractant.展开更多
Background and objective： Hepatic sinusoidal obstruction syndrome （HSOS） is characterized by painful hepatomegaly, ascites, increased body weight, and jaundice. Gynura segetum （Compositae）, a plant widely used in...Background and objective： Hepatic sinusoidal obstruction syndrome （HSOS） is characterized by painful hepatomegaly, ascites, increased body weight, and jaundice. Gynura segetum （Compositae）, a plant widely used in Chinese traditional medicine, often leads to the development of HSOS. However, the mechanism is unclear. The aim was to study the role of matrix metalloproteinase-9 （MMP-9） in the onset of HSOS induced by Gynura segetum. Methods： Twenty-five male Sprague-Dawley rats were randomly divided into two groups. Twenty were exposed to 600 mg/kg daily Gynura segetum extract solution for three weeks; five control rats were exposed to tap water alone. Liver sections were evaluated by light microscopy with a modified scoring system. Routine transmission electron microscopy （TEM） methods were used to evaluate the ultrastructual features of fixed liver tissue, and blood samples were collected to determine liver enzyme concentrations. MMP-9 expression was assessed by both immunohisto- chemical staining and enzyme-linked immunosorbent assay （ELISA） methods. Results： A stable and reproducible rat model of HSOS was achieved by long-term exposure to Gynura segetum extract. The treated rats presented clinical symptoms and the histopathological manifestation of HSOS, including abnormal liver enzyme concentrations （alanine aminotransferase （ALT）： （84.8＋13.62） vs. （167.0±72.63） U/L, P〈0.05; aspartate aminotransferase （AST）： （27.6±6.31） vs. （232.8±108.58） U/L, P〈0.05）. Hematoxylin and eosin （H＆E） staining and TEM together revealed deposition of red blood cells, the damage and destruction of hepatic sinusoidal endothelial cells, collapse of hepatic sinusoids, hem- orrhage of subendothelial cells, atrophy and destruction of hepatocytes, etc. Compared with controls, the expression of MMP-9 in the blood sample, the lung and liver tissues of HSOS rats was increased. Conclusions： MMP-9 may have an important role in early patholoclical chanqes of HSOS, and thus the onset of the disease.展开更多
Objective: Hepatic veno-occlusive disease(HVOD) has attracted increasing attention in recent years due to its relationship with ingestion of Gynura segetum. The mortality of severe HVOD remains high due to the lack of...Objective: Hepatic veno-occlusive disease(HVOD) has attracted increasing attention in recent years due to its relationship with ingestion of Gynura segetum. The mortality of severe HVOD remains high due to the lack of specific therapies. The aim of the study was to delineate the clinical characteristics and outcomes and explore the potential prognostic factors of HVOD.Methods: This was a single-center retrospective study. Eighty-nine HVOD patients were screened from the First Affiliated Hospital of Zhejiang University with an ingestion history of G. segetum before developing symptoms from January 2009 to May 2018. The enrolled patients were divided into the survivor and death groups according to the clinical follow-up that ended on September 1, 2019. The demographic variables and clinical data of the patients were recorded. A binary logistic regression analysis and receiver operating characteristic curve were conducted to identify the prognostic factors and assess the prognostic value for predicting death, and a survival analysis was performed to evaluate the clinical outcomes.Results: Sixty-four patients were eligible for further analysis. Most patients showed abdominal distension and were positive for migrating dullness in the abdomen(P = 0.740 and P = 0.732, respectively). The patients who died had higher levels of model for end-stage liver disease score, and higher prothrombin time than those who survived(both P < 0.001). All HVOD patients in both the survival and death groups showed ascites with abnormal imaging presentations of the liver parenchyma and hepatic blood vessels.Unexpectedly, we found that hydrothorax was detected in 21(65.63%) patients in the death group and 19(59.38%) patients in the survivor group during hospitalization, which was rarely mentioned in previous studies. Furthermore, international normalized ratio(INR) and creatinine are found to be potential independent prognostic factors for predicting death. Six severe patients achieved clinical improvements and survived after liver transplantation.Conclusion: HVOD can be induced by the ingestion of G. segetum, and INR combined with creatinine has prognostic value for predicting death. Liver transplantation may be an effective treatment option for severe HVOD patients.展开更多
文摘[Objectives]To study the antioxidant activity of different solvent extracts of Gynura segetum in vitro,so as to provide experimental basis for further study and utilization of medicinal resources of G.segetum.[Methods]The antioxidant activity of different solvent extracts of G.segetum was determined by UV-vis spectrophotometer using DPPH free radical scavenging method and ABTS^+free radical scavenging method.[Results]The scavenging rates of DPPH and ABTS^+by acetone extract were high,reaching 98.9%and 98.3%,respectively;the scavenging rate of DPPH and ABTS^+by water extract was the lowest,and the scavenging rates were 76.7%and 77.5%,respectively.The order of ABTS^+radical scavenging rate of samples extracted with different extractants was as follows:S 5(acetone extract)>S 1(ethyl acetate extract)>S 6(ethanol extract)>S 4(n-butanol extract)>S 3(methanol extract)>S 2(distilled water extract);the order of DPPH radical scavenging rate of samples extracted with different extractants was as follows:S 5(acetone extract)>S 1(ethyl acetate extract)>S 4(n-butanol extract)>S 6(ethanol extract)>S 3(methanol extract)>S 2(distilled water extract).[Conclusions]The extracts of acetone,ethyl acetate,n-butanol,anhydrous ethanol,methanol and distilled water from the roots of G.segetum had obvious scavenging effects on DPPH and ABTS^+,all had antioxidant components,and acetone had the highest antioxidant effect as an extractant.
基金Project supported by the National Natural Science Foundation of China (No.30925033)the Administration of Traditional Chinese Medicine of Zhejiang Province (No.2007ZA016),China
文摘Background and objective： Hepatic sinusoidal obstruction syndrome （HSOS） is characterized by painful hepatomegaly, ascites, increased body weight, and jaundice. Gynura segetum （Compositae）, a plant widely used in Chinese traditional medicine, often leads to the development of HSOS. However, the mechanism is unclear. The aim was to study the role of matrix metalloproteinase-9 （MMP-9） in the onset of HSOS induced by Gynura segetum. Methods： Twenty-five male Sprague-Dawley rats were randomly divided into two groups. Twenty were exposed to 600 mg/kg daily Gynura segetum extract solution for three weeks; five control rats were exposed to tap water alone. Liver sections were evaluated by light microscopy with a modified scoring system. Routine transmission electron microscopy （TEM） methods were used to evaluate the ultrastructual features of fixed liver tissue, and blood samples were collected to determine liver enzyme concentrations. MMP-9 expression was assessed by both immunohisto- chemical staining and enzyme-linked immunosorbent assay （ELISA） methods. Results： A stable and reproducible rat model of HSOS was achieved by long-term exposure to Gynura segetum extract. The treated rats presented clinical symptoms and the histopathological manifestation of HSOS, including abnormal liver enzyme concentrations （alanine aminotransferase （ALT）： （84.8＋13.62） vs. （167.0±72.63） U/L, P〈0.05; aspartate aminotransferase （AST）： （27.6±6.31） vs. （232.8±108.58） U/L, P〈0.05）. Hematoxylin and eosin （H＆E） staining and TEM together revealed deposition of red blood cells, the damage and destruction of hepatic sinusoidal endothelial cells, collapse of hepatic sinusoids, hem- orrhage of subendothelial cells, atrophy and destruction of hepatocytes, etc. Compared with controls, the expression of MMP-9 in the blood sample, the lung and liver tissues of HSOS rats was increased. Conclusions： MMP-9 may have an important role in early patholoclical chanqes of HSOS, and thus the onset of the disease.
基金supported by the Foundation of Key Discipline Construction of Zhejiang Province for Traditional Chinese Medicine(Grant No. 2017-XK-A36)the Foundation of Key Research Project of Zhejiang Province for Traditional Chinese Medicine (Grant No. 2019ZZ014)。
文摘Objective: Hepatic veno-occlusive disease(HVOD) has attracted increasing attention in recent years due to its relationship with ingestion of Gynura segetum. The mortality of severe HVOD remains high due to the lack of specific therapies. The aim of the study was to delineate the clinical characteristics and outcomes and explore the potential prognostic factors of HVOD.Methods: This was a single-center retrospective study. Eighty-nine HVOD patients were screened from the First Affiliated Hospital of Zhejiang University with an ingestion history of G. segetum before developing symptoms from January 2009 to May 2018. The enrolled patients were divided into the survivor and death groups according to the clinical follow-up that ended on September 1, 2019. The demographic variables and clinical data of the patients were recorded. A binary logistic regression analysis and receiver operating characteristic curve were conducted to identify the prognostic factors and assess the prognostic value for predicting death, and a survival analysis was performed to evaluate the clinical outcomes.Results: Sixty-four patients were eligible for further analysis. Most patients showed abdominal distension and were positive for migrating dullness in the abdomen(P = 0.740 and P = 0.732, respectively). The patients who died had higher levels of model for end-stage liver disease score, and higher prothrombin time than those who survived(both P < 0.001). All HVOD patients in both the survival and death groups showed ascites with abnormal imaging presentations of the liver parenchyma and hepatic blood vessels.Unexpectedly, we found that hydrothorax was detected in 21(65.63%) patients in the death group and 19(59.38%) patients in the survivor group during hospitalization, which was rarely mentioned in previous studies. Furthermore, international normalized ratio(INR) and creatinine are found to be potential independent prognostic factors for predicting death. Six severe patients achieved clinical improvements and survived after liver transplantation.Conclusion: HVOD can be induced by the ingestion of G. segetum, and INR combined with creatinine has prognostic value for predicting death. Liver transplantation may be an effective treatment option for severe HVOD patients.
