RESUMO
We studied association of Oprm1 gene polymorphisms with signs of N-(1-phenethyl-4-piperidyl)propionanilide intoxication in rats. It was found that the rate of intoxication in laboratory animals depends on genetic features. A polymorphic variant rs105312806 of Oprm1 gene can be a possible marker of animal sensitivity to opioid receptor agonists. This hypothesis was supported by differences in the rats of intoxication signs such as time to lateral posture and sleep duration in homozygous rats carrying different alleles. In rats with AA genotype, the time to lateral posture was shorter by 1.3 times and sleep duration was longer by 3.5 times than in carriers of GG genotype.
Assuntos
Hipnóticos e Sedativos/farmacologia , Polimorfismo de Nucleotídeo Único/genética , Receptores Opioides mu/genética , Alelos , Animais , Genótipo , Masculino , Ratos , Receptores Opioides mu/antagonistas & inibidores , Receptores Opioides mu/metabolismo , Sono/efeitos dos fármacosRESUMO
Expression of genes encoding the individual subunits of ionotropic GABAA receptor was assessed after acute and chronic intoxication of rats with ethanol. The chronic 1-month-long exposure to ethanol signifi cantly decreased (by 38%) expression of Gabrb1 gene in the hippocampus. Acute exposure to ethanol elevated expression of genes Gabrb1 (by 1.7 times), Gabra1 (by 3.8 times), and Gabra4 (by 6.5 times), although it diminished expression of Gabra2 gene by 1.4 times. In preliminarily alcoholized rats, acute intoxication with ethanol enhanced expression of genes Gabrb1 and Gabra5 by 1.7 and 8.7 times, respectively. There was neither acute nor chronic effect of ethanol on expression of gene Gabra3.
Assuntos
Etanol/efeitos adversos , Regulação da Expressão Gênica/efeitos dos fármacos , Expressão Gênica/efeitos dos fármacos , Receptores de GABA-A/biossíntese , Intoxicação Alcoólica/metabolismo , Animais , Hipocampo/metabolismo , Masculino , Ratos , Receptores de GABA-A/genéticaRESUMO
The effect of low morphine concentrations on the plasmatic membranes of erythrocytes without opiate receptors was investigated. It was shown that the ATPase activity and hemolytic stability of erythrocytes, which characterize the state of cell membranes and the mobility of the near-membrane water phase, depend on the concentration of morphine, and this dependence is wave-like. The nonmonotonous dependence of the biological response was suggested to be due to changes in the structure of water hydrogen links near the membrane surface, induced by opiate molecules. The hypothesis was confirmed by the results of studies of morphine water solutions using the methods of fluorescent probe and light scattering. It was found that the intensity of light scattering by water and the mobility of its molecules considerably increase in the presence of strictly specified concentrations of morphine.