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1.
J. physiol. biochem ; 68(2): 237-245, jun. 2012.
Artigo em Espanhol | IBECS | ID: ibc-122343

RESUMO

In view of the significant health impact of oxidative stress and apoptosis dysfunction, and further, because of suggestions that administration of antioxidants might reduce apoptosis rate through up-regulation of body antioxidant defense systems, therefore the purpose of this study was to compare the effect of buffalo (Bubalus bubalis) pineal proteins (PP at 100 ìg/kg BW, i.p.) with melatonin (MEL at 10 mg/kg BW, i.p.) on blood (erythrocytes) antioxidant defense system and apoptosis in isolated peripheral blood lymphocytes of female Wistar albino rats. The cell viability index (%) and apoptosis index (%), which are directly related to the apoptosis rate of the cells, were used as dependent measures for inferring PP and MEL activity. The total cell viability index did not differ between rats treated with MEL and PP from control animals. The percentage of apoptotic cell death through fluorescence microscopy also did not change in MEL and PP groups as compared with control. DNA fragmentation as an index of apoptosis was detected with propidium iodide staining and assessed by flow cytometry. Pineal proteins and MEL administration caused significant (p < 0.05) reduction in lipid peroxidation and increased level of catalase, superoxide dismutase, glutathione peroxidase, and glutathione in erythrocytes as compared with control. Interestingly, we did not observe increase in the non-viable cells and percentage of apoptotic cell death in PP-treated group, controls or in animals in which MEL had been administered. Therefore, the present study confirmed the up-regulation of erythrocytes (blood) antioxidant defense systems and absence of adverse effect on rate of apoptosis in PP and MEL-administered rats under absence of stress or toxicant exposure. Hence, these test agents can be tested for further therapeutic values against adverse apoptosis rate under stress or toxicants exposures (AU)


Assuntos
Animais , Ratos , Melatonina/farmacocinética , Apoptose/fisiologia , Antioxidantes/fisiologia , Hormônios Neuro-Hipofisários/farmacocinética , Elementos de Resposta Antioxidante/fisiologia , Substâncias Protetoras/farmacocinética , Modelos Animais de Doenças , 5-Metoxitriptamina/farmacocinética
2.
Pharmacol Biochem Behav ; 83(1): 122-9, 2006 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16460788

RESUMO

Few studies have examined the effects of 5-methoxy-N,N-diisopropyltryptamine (5-MeO-DIPT) in vivo. In these studies, 5-MeO-DIPT was tested in a drug-elicited head twitch assay in mice where it was compared to the structurally similar hallucinogen N,N-dimethyltryptamine (N,N-DMT) and challenged with the selective serotonin (5-HT)2A antagonist M100907, and in a lysergic acid diethylamide (LSD) discrimination assay in rats where its subjective effects were challenged with M100907 or the 5-HT 1A selective antagonist WAY-100635. Finally, the affinity of 5-MeO-DIPT for three distinct 5-HT receptors was determined in rat brain. 5-MeO-DIPT, but not N,N-DMT, induced the head twitch responses in the mouse, and this effect was potently antagonized by prior administration of M100907. In rats trained with LSD as a discriminative stimulus, there was an intermediate degree (75%) of generalization to 5-MeO-DIPT and a dose-dependent suppression of response rates. These interoceptive effects were abolished by M100907, but were not significantly attenuated by WAY-100635. Finally, 5-MeO-DIPT had micromolar affinity for 5-HT 2A and 5-HT 2C receptors, but much higher affinity for 5-HT 1A receptors. 5-MeO-DIPT is thus effective in two rodent models of 5-HT2 agonist activity, and has affinity at receptors relevant to hallucinogen effects. The effectiveness with which M100907 antagonizes the behavioral actions of this compound, coupled with the lack of significant antagonist effects of WAY-100635, strongly suggests that the 5-HT 2A receptor is an important site of action for 5-MeO-DIPT, despite its apparent in vitro selectivity for the 5-HT 1A receptor.


Assuntos
5-Metoxitriptamina/análogos & derivados , Alucinógenos/farmacologia , 5-Metoxitriptamina/farmacocinética , 5-Metoxitriptamina/farmacologia , Animais , Encéfalo/efeitos dos fármacos , Encéfalo/metabolismo , Relação Dose-Resposta a Droga , Fluorbenzenos/farmacologia , Dietilamida do Ácido Lisérgico/farmacologia , Masculino , Camundongos , Piperazinas/farmacologia , Piperidinas/farmacologia , Piridinas/farmacologia , Ratos , Ratos Endogâmicos F344 , Receptor 5-HT1A de Serotonina/efeitos dos fármacos , Receptor 5-HT1A de Serotonina/metabolismo , Receptor 5-HT2A de Serotonina/efeitos dos fármacos , Receptor 5-HT2A de Serotonina/metabolismo , Antagonistas da Serotonina/farmacologia
3.
J Neural Transm Gen Sect ; 84(1-2): 33-43, 1991.
Artigo em Inglês | MEDLINE | ID: mdl-2054148

RESUMO

5-Methoxytryptamine (5-MT), 5-methoxytryptophol (5-ML) and melatonin (Mel) were measured in the plasma after 2, 5, and 8 weeks administration of 25 micrograms 5-MT to golden hamsters kept under long photoperiod. 5-MT showed a one compartment kinetic profile in the plasma with half lives of 14.8 min after 2 weeks, 15 min after 5 weeks and 19.1 min after 8 weeks. A rapid metabolism of 5-MT was shown, Mel and 5-ML being detected in the plasma following 5-MT administration. However it was also shown that the gonadal atrophy observed after 5-MT administration cannot be due to its metabolism into these 2 compounds. Indeed when exogenously administered at a dose generating the same plasma concentration as that observed after 5-MT, the gonadal regression observed after the association of 5-ML and Mel is much less than that observed after 5-MT. 5-MT is thus a compound of great physiological interest.


Assuntos
5-Metoxitriptamina/farmacocinética , Indóis/sangue , Melatonina/sangue , 5-Metoxitriptamina/administração & dosagem , 5-Metoxitriptamina/sangue , 5-Metoxitriptamina/toxicidade , Animais , Atrofia , Ritmo Circadiano/efeitos dos fármacos , Ritmo Circadiano/efeitos da radiação , Cricetinae , Masculino , Mesocricetus , Glândula Pineal/química , Glândula Pineal/fisiologia , Testículo/efeitos dos fármacos , Testículo/patologia
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