Biological effects of modified colchicines. 2. Evaluation of catecholic colchicines, colchifolines, colchicide, and novel N-acyl- and N-aroyldeacetylcolchicines
摘要:
A series of natural and synthetic colchicine derivatives was examined for their potency in the lymphocytic leukemia P388 screen in mice, for their toxicity in mice, and for their binding to microtubule protein. The natural alkaloids cornigerine and colchifoline and several N,O-substituted analogues of colchifoline were found to be as potent and as toxic as colchicine in the P388 screen with good affinity for tubulin. The 1,2-(methylenedioxy)-substituted isomer of cornigerine was considerably less potent in vivo than could have been anticipated from the in vitro tubulin binding data. Several N-acyl and N-aroyl derivatives prepared from deacetylcolchicine showed high potency in the in vitro and in vivo screens. Colchicide was found to be highly potent in vivo, and N-carbethoxydeacetylcolchicine, a synthetic analogue of colchicine with a N-carbethoxy instead of an N-acetyl function, showed interesting biological properties.
Biological effects of modified colchicines. 2. Evaluation of catecholic colchicines, colchifolines, colchicide, and novel N-acyl- and N-aroyldeacetylcolchicines
作者:Arnold Brossi、Padam N. Sharma、Louise Atwell、Arthur E. Jacobson、Maria A. Iorio、Marisa Molinari、Colin F. Chignell
DOI:10.1021/jm00364a006
日期:1983.10
A series of natural and synthetic colchicine derivatives was examined for their potency in the lymphocytic leukemia P388 screen in mice, for their toxicity in mice, and for their binding to microtubule protein. The natural alkaloids cornigerine and colchifoline and several N,O-substituted analogues of colchifoline were found to be as potent and as toxic as colchicine in the P388 screen with good affinity for tubulin. The 1,2-(methylenedioxy)-substituted isomer of cornigerine was considerably less potent in vivo than could have been anticipated from the in vitro tubulin binding data. Several N-acyl and N-aroyl derivatives prepared from deacetylcolchicine showed high potency in the in vitro and in vivo screens. Colchicide was found to be highly potent in vivo, and N-carbethoxydeacetylcolchicine, a synthetic analogue of colchicine with a N-carbethoxy instead of an N-acetyl function, showed interesting biological properties.
Fluorinated colchicinoids: antitubulin and cytotoxic properties
The synthesis of B-ring and C-ring trifluoroacetamide-substituted colchicinoids and fluoro-substituted colchicineethylamides is presented. The B-ring trifluoroacetamido-substituted analogues exhibit moderate enhancement of potency compared to the nonfluorinated analogues for tubulin assembly inhibition and cytotoxicity toward two wild type cell lines. The C-ring substituted fluoroethylamides have reduced relative potencies in the same systems due to the strong electron-withdrawing effect of the fluoro derivatives. The fluoro colchicinoids are much more cytotoxic toward drug-resistant cell lines than to the wild type cell lines. Their enhanced potency is probably due to an effect of the fluoro moiety on functions specific to resistant cells and/or their higher hydrophobicity that may result in higher intracellular drug content. This finding may suggest the application of designed fluorinated anticancer drugs to overcome acquired resistance which may develop after several regiments of treatment with a nonfluorinated chemotherapeutic agent.