RESUMO
Obesity is one of the most serious public health problems worldwide in the 21st century. Current therapeutic treatment for obesity is mostly focused on preventive measures involving dietary control and physical exercises in combination with anti-obesity medications. However, most of these anti-obesity medications have little or no effect on weight loss, and some cases have demonstrated fatal side effects. Due to the urgent need for highly potent and selective anti-obesity agents, the serotonin receptors (5-HTR) have been the focus of much interest as a novel therapeutic target. In this report, we have developed pyrimidoazepine analogs targeting the 5-HT2A and 5-HT2C receptors and evaluated their biological activity in vitro and in vivo as novel anti-obesity agents. We were able to identify 6p as the most potent 5-HT2A and 5-HT2C ligand in vitro (IC50 = 3 nM and 2.3 nM, respectively), and this compound also demonstrated the greatest potency in vivo. In an acute obesity model, mice treated with 6p showed significant decrease in body weight gain and food intake over approximately 77-94% compared to a control group. In a chronic obesity model, mice treated with 6p also showed a marked decrease in food intake and body weight gain.
Assuntos
Fármacos Antiobesidade/farmacologia , Obesidade/prevenção & controle , Receptor 5-HT2A de Serotonina/metabolismo , Receptor 5-HT2C de Serotonina/metabolismo , Serotoninérgicos/farmacologia , Animais , Fármacos Antiobesidade/síntese química , Fármacos Antiobesidade/farmacocinética , Área Sob a Curva , Azepinas/química , Azepinas/farmacocinética , Azepinas/farmacologia , Ligação Competitiva , Relação Dose-Resposta a Droga , Ingestão de Alimentos/efeitos dos fármacos , Células HEK293 , Humanos , Ligantes , Masculino , Taxa de Depuração Metabólica , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Obesos , Modelos Químicos , Estrutura Molecular , Obesidade/metabolismo , Pirimidinas/química , Pirimidinas/farmacocinética , Pirimidinas/farmacologia , Ensaio Radioligante , Ratos , Ratos Sprague-Dawley , Receptor 5-HT2A de Serotonina/genética , Receptor 5-HT2C de Serotonina/genética , Serotoninérgicos/síntese química , Serotoninérgicos/farmacocinética , Aumento de Peso/efeitos dos fármacosRESUMO
PURPOSE OF WORK: Thymidine is an important precursor in antiviral drugs. We have enhanced thymidine production in E. coli by eliminating the repressors in the transcription of the gene coding for carbamoyl phosphate synthetase. The operon for carbamoyl phosphate synthetase (CarAB) in the thymidine biosynthesis regulatory pathway was derepressed by disrupting three known repressors (purR, pepA and argR). Combinatorial disruption of three repressors increased CarA expression levels in accordance with degree of disruption, which had a positive correlation with thymidine production. By simultaneous disruption of three repressors (BLdtugRPA), CarA expression level was increased by 3-fold compared to the parental strain, leading to an increased thymidine yield from 0.25 to 1.1 g thymidine l(-1). From BLdtugRPA, we established BLdtugRPA24 by transforming two plasmids expressing enzymes in the thymidine biosynthetic pathway and obtained 5.2 g thymidine l(-1) by Ph-stat fed-batch fermentation.
