Cytotoxicity evaluation of natural coptisine and synthesis of coptisine from berberine
摘要:
The crude extract (80% MeOH in water) of Chelidonii herba exhibited very interesting cytotoxicity against brine shrimp (Artemia salina Leach) nauplii and cultured human tumour cell in vitro, the colon carcinoma HT 29 (144 h treatment). Fractionation of the crude extract and bioassay-guided procedures showed that the cytotoxic and,the antitumour activities. were concentrated in the basic extract. On the basis of IR, MS and H-1 NMR the compound responsible of the cytotoxic activity was determined to be coptisine. Cytotoxicity evaluation of-coptisine was next extended to-a panel of human and murine cell lines in comparison with the established antitumour drugs mitoxantrone, doxorubicin (D. x) and cisplatin. (CDDP). Coptisine was cytotoxic on LoVo and HT 29 and less potent on L-1210, and it was partially crossresistant on the human tumour colon cell line resistant to Dx, LoVo/Dx, whereas it was not significantly crossresistant on the murine leukaemia cell line resistant to. CD. DP, L-1210/CDDP. Coptisine alkaloid was then synthesised in gram amount from commercial berberine. A four-step synthetic route was elaborated. The overall yield was about 8-10%. The structural identity of synthetic coptisine was verified by IR and NMR methods. A comparison of the cytotoxic effects on the human tumour colon cell line LoVo and on the murine leukaemia L1210 showed, for both natural and synthetic coptisines, a comparable cytotoxic activity more evident against-HT 29 cell line and LoVo. cell line, while the activity was lower against the L1210 cell line. (C) 2001 Editions scientifiques et medicales. Elsevier SAS.
Improving solubility and avoiding hygroscopicity of tetrahydroberberine by forming hydrochloride salts by introducing solvents: [HTHB]Cl, [HTHB]Cl·CH<sub>3</sub>OH and [HTHB]Cl·CH<sub>3</sub>COOH
With an aim to improve the solubility and dissolution rate of tetrahydroberberine (THB) by forming hydrochloride salts, three salts of THB, [HTHB]Cl (1), [HTHB]Cl•CH3OH (2) and [HTHB]Cl•CH3COOH (3), have been synthesized and characterized. The solubility and dissolution rate suggest the maximum solubility values for 1-3 are approximately 98, 47, and 43 times as large as that of THB, and dissolution
The present invention relates to methods and compositions that affect the GTP-binding activity of members of the Rho family GTPases, preferably Rac GTPases (Rac1, Rac1b, Rac2 and/or Rac3).
The synthesis of a series of berberine, phenantridine and isoquinoline derivatives was realized to explore their Rho GTPase nucleotide inhibitory activity. The compounds were evaluated in a nucleotide binding competition assay against Rac1, Rac1b, Cdc42 and in a cellular Rac GTPase activation assay. The insertion of 19 AA in the splice variant Rac1b is shown to be sufficient to introduce a conformational difference that allows compounds 4, 21, 22, and 26 to exhibit selective inhibition of Rac 1b over Rac1. (C) 2009 Elsevier Ltd. All rights reserved.
[EN] COMPOUNDS AND METHODS FOR MODULATING RHO GTPASES<br/>[FR] COMPOSÉS ET PROCÉDÉS POUR MODULER LES GTPASES RHO
申请人:EXONHIT THERAPEUTICS SA
公开号:WO2009007457A2
公开(公告)日:2009-01-15
The present invention relates to methods and compositions that affect the GTP-binding activity of members of the Rho family GTPases, preferably Rac GTPases (Rac1, Rac1b, Rac2 and/or Rac3).