Design, synthesis and biological evaluation of seco-A-pentacyclic triterpenoids-3,4-lactone as potent non-nucleoside HBV inhibitors
摘要:
A series of seco-A-pentacyclic triterpenoids-3,4-lactone were synthesized and the anti-HBV activities were evaluated in vitro. Several compounds inhibited the secretion of HBV antigen and the replication of HBV DNA in micromolar level. Compounds D7 and D10, seco-A-oleanane-3,4-lactone, suppressed the HBeAg secretion with IC50 values of 0.14 mu M and 0.86 mu M respectively, and the inhibitory activities were also confirmed by detecting the fluorescence intensity of FITC-labeled monoclonal mouse HBeAg antibody via flow cytometry. Compounds D7 and D10 as well as B4, ring-A cleaved 3,30-dioic acid, also displayed remarkable inhibition on both HBV DNA replication at the concentration of 25 mu M and HBV cccDNA (covalently closed circularDNA) replication with IC50 values of 33.5 mu M, 32.7 mu M and 12.3 mu M respectively. (C) 2018 Elsevier Ltd. All rights reserved.
Design, synthesis and biological evaluation of seco-A-pentacyclic triterpenoids-3,4-lactone as potent non-nucleoside HBV inhibitors
摘要:
A series of seco-A-pentacyclic triterpenoids-3,4-lactone were synthesized and the anti-HBV activities were evaluated in vitro. Several compounds inhibited the secretion of HBV antigen and the replication of HBV DNA in micromolar level. Compounds D7 and D10, seco-A-oleanane-3,4-lactone, suppressed the HBeAg secretion with IC50 values of 0.14 mu M and 0.86 mu M respectively, and the inhibitory activities were also confirmed by detecting the fluorescence intensity of FITC-labeled monoclonal mouse HBeAg antibody via flow cytometry. Compounds D7 and D10 as well as B4, ring-A cleaved 3,30-dioic acid, also displayed remarkable inhibition on both HBV DNA replication at the concentration of 25 mu M and HBV cccDNA (covalently closed circularDNA) replication with IC50 values of 33.5 mu M, 32.7 mu M and 12.3 mu M respectively. (C) 2018 Elsevier Ltd. All rights reserved.
Gastroprotective and ulcer-healing activity of oleanolic acid derivatives: In vitro–in vivo relationships
作者:Marianela Sánchez、Cristina Theoduloz、Guillermo Schmeda-Hirschmann、Iván Razmilic、Tania Yáñez、Jaime A. Rodríguez
DOI:10.1016/j.lfs.2006.03.044
日期:2006.8
The triterpene oleanolic acid 1 and its semisynthetic derivatives 2-7 were assessed for gastroprotective and ulcer-healing effect using human epithelial gastric cells (AGS) and human lung fibroblasts (MRC-5). The ability of the compounds to protect the AGS cells against the damage induced by sodium taurocholate (NaT), to stimulate the cellular reduced glutathione (GSH) and prostaglandin E-2 content, to enhance AGS and MRC-5 cell proliferation and to scavenge superoxide anion in vitro was studied. The cytotoxicity of the compounds was assessed towards MRC-5 and AGS cells. In addition, the gastroprotective activity of the compounds was assessed in vivo using the HCl/EtOH-induced ulcer model in mice. All the assayed compounds displayed a significant reduction of AGS cells damage after incubation with NaT. None of the studied compounds was active as a superoxide anion scavenger nor stimulated the GSH content in AGS, cell cultures. Compounds 1, 2, 4 and 6 were able to increase the prostaglandin content in AGS cell cultures. Concerning the proliferation assays, a significant stimulating effect was observed for compounds 3 and 7 on AGS cells and for 1 and 7 on MRC-5 fibroblasts. Regarding cytotoxicity, derivatives 2, 4, 6 and 7 were less toxic than the parent compound oleanolic acid. Our results strongly support the predictive capacity of the in vitro assessment of gastroprotective activity allowing the reduction of experimental animals. (c) 2006 Elsevier Inc. All rights reserved.
Practical Application of Oxidation Using a Novel Na<sub>2</sub>WO<sub>4</sub>−H<sub>2</sub>O<sub>2</sub> System under Neutral Conditions for Scale-Up Manufacturing of 12α-Hydroxy-3-oxooleanano-28,13-lactone: Key Intermediate of Endothelin A Receptor Antagonist S-0139
Novel alcohol oxidation using a Na2WO4-H2O2 System was applied to manufacture 12 alpha-hydroxy-3-oxooleanano-28,13-lactone which is it key intermediate of S-0139. Oxidation of the hydroxyl group of oleanolic acid was optimized based oil the design of experiment (DoE) approach. Statistical analysis was used to maximize the yield of the corresponding ketone and minimize the generation of byproducts. The safety evaluation of this oxidation was also conducted in detail, and pilot manufacturing was achieved.
Sweet Gum Fruit Extract as a Therapeutic Agent
申请人:Liu Zhijun
公开号:US20150110862A1
公开(公告)日:2015-04-23
Sweet gum (
Liquidambar styraciflua
L., family Hamamelidaceae) fruit extract was discovered to possess potent activities against multiple targets of the PI3K (phosphatidylinositide 3-kinase) pathway, especially the PI3K/Akt and mTOR pathways. At a very low concentration of 1.85 μg/ml (IC50), sweet gun extract showed the ability of simultaneously blocking the pathways of PI3K/Akt (upstream), mTOR (mammalian target of rapamycin) (downstream), as well as its downstream protein products S6K and S6. It was also able to block 5-HETE, a lipoxygenase product that contributes to inflammation and activation of PI3K/Akt. The sweet gum fruit extract was prepared with 50% methanol (47:1; raw to extract) and concentrated to an organic fraction (210:1 raw to extract) referred as LIS-100 via reverse-phase column chromatography using a bioassay directed fractionation approach. The extract is a new targeted therapeutic agent for numerous disorders known to be treated by mTOR inhibitors, including cancer, diabetes, obesity, and inflammation.
Design, synthesis and biological evaluation of seco-A-pentacyclic triterpenoids-3,4-lactone as potent non-nucleoside HBV inhibitors
A series of seco-A-pentacyclic triterpenoids-3,4-lactone were synthesized and the anti-HBV activities were evaluated in vitro. Several compounds inhibited the secretion of HBV antigen and the replication of HBV DNA in micromolar level. Compounds D7 and D10, seco-A-oleanane-3,4-lactone, suppressed the HBeAg secretion with IC50 values of 0.14 mu M and 0.86 mu M respectively, and the inhibitory activities were also confirmed by detecting the fluorescence intensity of FITC-labeled monoclonal mouse HBeAg antibody via flow cytometry. Compounds D7 and D10 as well as B4, ring-A cleaved 3,30-dioic acid, also displayed remarkable inhibition on both HBV DNA replication at the concentration of 25 mu M and HBV cccDNA (covalently closed circularDNA) replication with IC50 values of 33.5 mu M, 32.7 mu M and 12.3 mu M respectively. (C) 2018 Elsevier Ltd. All rights reserved.