Ação moduladora do citral e eugenol em eventos genéticos em magrófagos murinos in vitro
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Data
2012-02-27
Autores
Porto, Marília de Paula [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Devido a propriedades terapêuticas, várias plantas e seus constituintes químicos vêm sendo muitas vezes utilizados como o primeiro recurso para o tratamento de diversas doenças. Nesse contexto, compostos isolados de plantas têm sido alvos de inúmeros estudos que avaliam, além da atividade, seus possíveis mecanismos de ação. Dentre os compostos com potencial quimioprotetor, o citral e o eugenol merecem atenção devido suas estruturas químicas de monoterpeno e de composto fenólico, respectivamente, e por seus potenciais anti-inflamatório, antiparasitário e antioxidante. Considerando que mutação no DNA pode ser a primeira etapa de várias doenças, e que lesões induzidas nessa molécula podem ser prevenidas ou moduladas por compostos naturais, este estudo objetivou avaliar, pelo teste do cometa, o potencial genotóxico do citral (25, 50 e 100 Tg/mL) e do eugenol (0,31, 0,62, 1,24 e 2,48 Tg/mL), após diferentes tempos de tratamento (6, 10, 24 e 30 h) e, também, seus possíveis efeitos moduladores sobre danos induzidos no DNA pela doxorrubicina (DOX), em diferentes protocolos de tratamento (pré, pós e simultaneamente à DOX) e momentos de análise (12, 24 e 36 h), em macrófagos peritoneais de camundongos. Além disso, foi avaliado o potencial toxicogenômico do citral e do eugenol por meio da modulação da expressão dos genes NF-kB1, COX-2 e TNF-α (relacionados a processos inflamatórios) em macrófagos ativados ou não por lipopolissacarideo de bactéria (LPS). Os resultados mostraram que ambos os compostos apresentaram potencial genotóxico. No caso do citral, a genotoxicidade foi observada para as duas maiores concentrações, mas apenas no tempo de 6h; para o eugenol, o aumento de danos no DNA foi detectado para todas as concentrações, em pelo menos um momento de análise. Com relação ao potencial...
Because of the therapeutic properties, several plants and their chemical constituents have been used for treatment of various diseases. Therefore, isolated compounds from plants have been targets of numerous studies that evaluate their activity and mechanisms of action. Among compounds with chemopreventive potential, citral and eugenol have gain attention because of their chemical structures, monoterpene and phenol,respectively, and for their anti-inflammatory, antioxidant and antiparasitic potentials. Since DNA mutation is the first step for some diseases, and since the lesions induced in this molecule can be prevented or modulated by natural compounds, aim of the present study was first to evaluate the genotoxic potential of citral (25, 50 and 100 Tg/mL) and eugenol (0.31, 0.62, 1.24 and 2.48 Tg/mL) at different times after exposure (6, 10, 24 and 30 h), and then, their ability to modulate DNA damage induced by doxorubicin (DOX) at different treatment protocols (pre, post and simultaneous with DOX) and times (12, 24 and 36 h) in mice peritoneal macrophages. In addition, the toxicogenomic potential of citral and eugenol by modulating the expression of NF-KB1, COX-2 and TNF-α (related to inflammatory processes) genes in macrophages activated or not by bacterial lipopolysaccharide (LPS) was also investigated. The results showed that both compounds have genotoxic potential. In the case of citral, genotoxicity was observed for the two major concentrations, but only 6h after the exposure. For eugenol, increased DNA damage was detected for all concentrations, in at least one moment of analysis. Related to the antigenotoxicity, both citral and eugenol presented protective effects at different concentrations and treatment protocols, and the more effective activities were detected at simultaneous and pre-treatment... (Complete abstract click electronic access below)
Because of the therapeutic properties, several plants and their chemical constituents have been used for treatment of various diseases. Therefore, isolated compounds from plants have been targets of numerous studies that evaluate their activity and mechanisms of action. Among compounds with chemopreventive potential, citral and eugenol have gain attention because of their chemical structures, monoterpene and phenol,respectively, and for their anti-inflammatory, antioxidant and antiparasitic potentials. Since DNA mutation is the first step for some diseases, and since the lesions induced in this molecule can be prevented or modulated by natural compounds, aim of the present study was first to evaluate the genotoxic potential of citral (25, 50 and 100 Tg/mL) and eugenol (0.31, 0.62, 1.24 and 2.48 Tg/mL) at different times after exposure (6, 10, 24 and 30 h), and then, their ability to modulate DNA damage induced by doxorubicin (DOX) at different treatment protocols (pre, post and simultaneous with DOX) and times (12, 24 and 36 h) in mice peritoneal macrophages. In addition, the toxicogenomic potential of citral and eugenol by modulating the expression of NF-KB1, COX-2 and TNF-α (related to inflammatory processes) genes in macrophages activated or not by bacterial lipopolysaccharide (LPS) was also investigated. The results showed that both compounds have genotoxic potential. In the case of citral, genotoxicity was observed for the two major concentrations, but only 6h after the exposure. For eugenol, increased DNA damage was detected for all concentrations, in at least one moment of analysis. Related to the antigenotoxicity, both citral and eugenol presented protective effects at different concentrations and treatment protocols, and the more effective activities were detected at simultaneous and pre-treatment... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Macrofagos, Mutagenese, Expressão gênica, Mutagenesis, Genetics
Como citar
PORTO, Marília de Paula. Ação moduladora do citral e eugenol em eventos genéticos em magrófagos murinos in vitro. 2012. 79 f. Dissertacao (mestrado) - Universidade Estadual PaulistaJúlio de Mesquita Filho, Instituto de Biociências de Botucatu, 2012.