74515-40-5Relevant academic research and scientific papers
Liposomes as carriers for colchicine-derived prodrugs: Vascular disrupting nanomedicines with tailorable drug release kinetics
Crielaard, Bart J.,Van Der Wal, Steffen,Le, Huong Thu,Bode, Alo?s T.L.,Lammers, Twan,Hennink, Wim E.,Schiffelers, Raymond M.,Fens, Marcel H.A.M.,Storm, Gert
, p. 429 - 435 (2012)
Newly formed tumor vasculature has proven to be an effective target for tumor therapy. A strategy to attack this angiogenic tumor vasculature is to initiate local blood vessel congestion and consequently induce massive tumor cell necrosis. Vascular disrupting agents (VDAs) typically bind to tubulin and consequently disrupt microtubule dynamics. Colchicine and its derivatives (colchicinoids) are very potent tubulin binding compounds but have a narrow therapeutic index, which may be improved by employing a liposomal targeting strategy. However, as a result of their physicochemical properties, colchicinoids are problematic to retain in liposomes, as they are released relatively rapidly upon encapsulation. To overcome this limitation, two hydrolyzable PEGylated derivatives of colchicine were developed for encapsulation into the aqueous core of long-circulating liposomes: a moderately rapid hydrolyzing PEGylated colchicinoid containing a glycolic acid linker (prodrug I), and a slower hydrolyzing PEGylated colchicinoid with a lactic acid linker (prodrug II). Hydrolysis studies at 37 °C and pH 7.4 showed that prodrug I possessed relatively rapid conversion characteristics (t1/2 = 5.4 h) whereas prodrug II hydrolyzed much slower (t1/2 = 217 h). Upon encapsulation into liposomes, colchicine was released rapidly, whereas both PEGylated colchicine derivatives were efficiently retained and appeared to be released only after cleavage of the PEG-linker. This study therefore demonstrates that, in contrast to colchicine, these novel PEGylated colchicine-derived prodrugs are retained within the aqueous interior after encapsulation into liposomes, and that the release of the active parent can be controlled by using different biodegradable linkers.
SYNTHESIS OF COLCHIFOLINE FROM DEACETYLCOLCHICEINE
Iorio, Maria A.,Molinari, Marisa,Brossi, Arnold
, p. 283 - 284 (2007/10/02)
Treatment of a mixture of deacetylcolchicine and deacetylisocolchicine, obtained by diazomethane methylation of deacetylcolchiceine, with trifluoroacetylglycolyl chloride in pyridine, afforded directly colchifoline and isocolchifoline.The two ether isomers could be separated by chromatography and the material eluted first proved to be identical with colchifoline isolated from commercial samples of colchicine.
