Encontrados 10 documentos, a visualizar página 1 de 1
Dibenzofuran-induced mitochondrial dysfunction: Interaction with ANT carrier
Duarte, F.V.; Gomes, A.P.; Teodoro, J.S.; Varela, A.T.; Moreno, A.J.M.; Rolo, A.P.; Palmeira, C.M.Exposure to environmental pollutants such as dibenzofurans and furans is linked to the pathophysiology of several diseases. Dibenzofuran (DBF) is listed as a pollutant of concern due to its persistence in the environment, bioaccumulation and toxicity to humans, being associated with the development of lung diseases and cancers, due to its extremely toxic properties such as carcinogenic and teratogenic. Mitochon...
Dimethylaminopyridine derivatives of lupane triterpenoids cause mitochondrial d...
Bernardo, Telma C.; Cunha-Oliveira, Teresa; Serafim, Teresa L.; Holy, Jon; Krasutsky, Dmytro; Kolomitsyna, Oksana; Krasutsky, Pavel; Moreno, A. J. M.Triterpenoids are a large class of naturally occurring compounds, and some potentially interesting as anticancer agents have been found to target mitochondria. The objective of the present work was to investigate the mechanisms of mitochondrial toxicity induced by novel dimethylaminopyridine (DMAP) derivatives of pentacyclic triterpenes, which were previously shown to inhibit the growth of melanoma cells in vit...
Dioxin-induced acute cardiac mitochondrial oxidative damage and increased activ...
Pereira, Susana P.; Pereira, Gonçalo C.; Pereira, Cláudia V.; Carvalho, Filipa S.; Cordeiro, Marília H.; Mota, Paula C.; Ramalho-Santos, J.The environmental dioxin 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is classified as a Group 1 human carcinogen and teratogenic agent.We hypothesize that TCDD-induced oxidative stress may also interfere with mitochondrial ATP-sensitive potassium channels (mitoKATP), which are known to regulate and to be regulated by mitochondrial redox state. We investigated the effects of an acute treatment of male Wistar rats...
UCP2 and ANT differently modulate proton-leak in brain mitochondria of long-ter...
Cardoso, Susana; Santos, M. S.; Moreno, A. J. M.; Moreira, Paula I.A growing body of evidence suggests that mitochondrial proton-leak functions as a regulator of reactive oxygen species production and its modulation may limit oxidative injury to tissues. The main purpose of this work was to characterize the proton-leak of brain cortical mitochondria from long-term hyperglycemic and insulininduced recurrent hypoglycemic rats through the modulation of the uncoupling protein 2 (U...
Comparative study of tributyltin toxicity on two bacteria of the genus Bacillus
Martins, J. D.; Jurado, A. S.; Moreno, A. J. M.; Madeira, V. M. C.Tributyltin is a potent biocide mainly used in marine antifouling paints. Owing to its widespread distribution in coast areas and its high toxicity to aquatic organisms, the use of this compound is generally restricted and under government regulation. Despite of that, it persists in the aquatic environment. Organotins used in industry have also been detected in terrestrial environments. The persistence and high...
Toxicity of methoprene as assessed by the use of a model microorganism
Monteiro, J. P.; Jurado, A. S.; Moreno, A. J. M.; Madeira, V. M. C.Methoprene is an insect juvenile growth hormone mimic, commonly used as a pesticide. Although widely used for the control of several pests, toxic effects on organisms of different phyla have been reported. These events triggered studies to clarify the mechanisms of toxicity of this insecticide putatively involved in ecological issues. Here we show the effect of methoprene on the normal cell growth and viability...
Carvedilol Protects against Doxorubicin-Induced Mitochondrial Cardiomyopathy
Santos, D. L.; Moreno, A. J. M.; Leino, R. L.; Froberg, M. K.; Wallace, K. B.Several cytopathic mechanisms have been suggested to mediate the dose-limiting cumulative and irreversible cardiomyopathy caused by doxorubicin. Recent evidence indicates that oxidative stress and mitochondrial dysfunction are key factors in the pathogenic process. The objective of this investigation was to test the hypothesis that carvedilol, a nonselective [beta]-adrenergic receptor antagonist with potent ant...
Study of carvedilol by combined Raman spectroscopy and ab initio MO calculations
Marques, M. P. M.; Oliveira, P. J.; Moreno, A. J. M.; Carvalho, L. A. E. Batista deThe novel cardioprotective drug carvedilol was studied by both Raman spectroscopy and ab initio molecular orbital methods (using the density functional theory approach). The spectra, acquired both for the solid samples and DMSO solutions as a function of pH, were assigned in view of the calculated wavenumbers and intensities, and also based on the experimental data obtained for individual compounds which compri...
Effects of Carvedilol on Isolated Heart Mitochondria: Evidence for a Protonopho...
Oliveira, Paulo J.; Marques, M. Paula M.; Carvalho, Luís A. E. Batista de; Moreno, A. J. M.Carvedilol (1-[carbazolyl-(4)-oxy]-3-[2-methoxyphenoxyethyl)amino]-propanol-(2)) is a novel compound used in clinical practice for the treatment of congestive heart failure, mild to moderate hypertension, and myocardial infarction. Carvedilol was also shown to protect cardiac mitochondria from oxidative stress events. Because mitochondria are the main suppliers of ATP for cardiac muscle work, a study of the eff...
Effects of calmodulin antagonists on the active Ca2+ uptake by rat liver mitoch...
Vale, M. G. P.; Moreno, A. J. M.; Carvalho, A. P.The mechanism of Ca2+ transport by rat liver mitochondria was investigated with respect to the possible involvement of calmodulin in this process. We studied the action of exogenous calmodulin isolated from brain tissue on the Ca2+-transport system, as well as the effect of two types of calmodulin antagonists; the phenothiazine drugs trifluoperazine and chlorpromazine and the more specific substance compound 48...
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