Biotransformação in vitro de novos candidatos a protótipos de fármacos antitumorais N-fenilpirazóis
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2014-02-28
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Universidade Federal de Goiás
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The "Microbial Models of Mammalian Metabolism" represents an alternative to use of animals on metabolism studies. Introduced in the 70s this model, also called biotranformation, has several advantages for their application as low cost, reduction of animals for experimentation and and higher number and range of metabolites produced. 1-(4-((1-(4-chlorophenyl)-1H-pyrazol-4-yl)methyl)piperazin-1-yl)ethanone (LQFM030) and 4-((1-(4-chlorophenyl)-1H-pyrazol-4-il)methyl)piperazin-1-ethyl carboxylate (LQFM018) compounds were synthesized by molecular simplification of a series of compounds with chronic myeloid leukemia antiproliferative activity already described, the Nutlins prototypes. This study aims to produce a probable human metabolites of LQFM 030 and LQFM 018 by microbial biotranformation with filamentous fungi. To do so, analytical methodologies were developed by thin layer chromatography and high performance liquid chromatography in order to monitor metabolites production. After perform a screening of tem microorganisms Mortierella isabellina NRRL 1757 strain was selected to obtain metabolites on a larger scale. Incubations were carried out with 100 mL of glucose culture medium in each flask . At the end of incubation (96 h) extraction and purification of possible metabolites was performed . In an independent assay with LQFM 030, ketoconazole (10, 20 and 30 mg) was added to inhibit P450 cytochrome . In another test 1 mL of ethanol was added every 24 hours to induce cytochrome totaling 96 hours of incubation. To evaluate the best time to finalize incubation , an experiment was conducted in 168 hours with different concentrations of the substrate, 0.25 mg / mL and 50 mg / mL. A possible role of CYP 3A was evidenced by the inhibition caused by ketoconazole addition, that can inhibit the formation of N-oxide metabolite in LQFM 030 biotransformation. Ethanol addition does not induce LQFM 030-N-oxide production, but was able to induce other metabolites formation. The best time to end LQFM 030 incubation was defined as 168 hours and 0.25 mg/mL concentration.
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ARAUJO, K. C. F. Biotransformação in vitro de novos candidatos a protótipos de fármacos antitumorais N-fenilpirazóis. 2014. 110 f. Dissertação (Mestrado em Ciências Farmacêuticas) - Universidade Federal de Goiás, Goiânia, 2014.