18 research outputs found

    Iron Behaving Badly: Inappropriate Iron Chelation as a Major Contributor to the Aetiology of Vascular and Other Progressive Inflammatory and Degenerative Diseases

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    The production of peroxide and superoxide is an inevitable consequence of aerobic metabolism, and while these particular "reactive oxygen species" (ROSs) can exhibit a number of biological effects, they are not of themselves excessively reactive and thus they are not especially damaging at physiological concentrations. However, their reactions with poorly liganded iron species can lead to the catalytic production of the very reactive and dangerous hydroxyl radical, which is exceptionally damaging, and a major cause of chronic inflammation. We review the considerable and wide-ranging evidence for the involvement of this combination of (su)peroxide and poorly liganded iron in a large number of physiological and indeed pathological processes and inflammatory disorders, especially those involving the progressive degradation of cellular and organismal performance. These diseases share a great many similarities and thus might be considered to have a common cause (i.e. iron-catalysed free radical and especially hydroxyl radical generation). The studies reviewed include those focused on a series of cardiovascular, metabolic and neurological diseases, where iron can be found at the sites of plaques and lesions, as well as studies showing the significance of iron to aging and longevity. The effective chelation of iron by natural or synthetic ligands is thus of major physiological (and potentially therapeutic) importance. As systems properties, we need to recognise that physiological observables have multiple molecular causes, and studying them in isolation leads to inconsistent patterns of apparent causality when it is the simultaneous combination of multiple factors that is responsible. This explains, for instance, the decidedly mixed effects of antioxidants that have been observed, etc...Comment: 159 pages, including 9 Figs and 2184 reference

    O esporte na qualidade de vida de indivíduos com lesão da medula espinhal: série de casos

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    INTRODUÇÃO: A lesĂŁo da medula espinhal Ă© um trauma de impacto fĂ­sico e social ao indivĂ­duo, que acarreta profundas modificaçÔes na vida de seus portadores pela paraplegia ou tetraplegia resultante. O objetivo deste estudo foi avaliar a percepção da qualidade de vida de indivĂ­duos com lesĂŁo da medula espinhal, antes e apĂłs um perĂ­odo de treinamento esportivo. MÉTODOS: Participaram do estudo 16 indivĂ­duos paraplĂ©gicos por lesĂŁo da medula espinhal, que realizaram treinamento esportivo da modalidade basquetebol em cadeira de rodas, com duração de duas horas por dia e frequĂȘncia de duas vezes por semana, por um perĂ­odo de um ano. Para avaliação da qualidade de vida PRÉ e PÓS o perĂ­odo de treinamento, foi utilizado o questionĂĄrio SF-36. RESULTADOS: Houve melhora geral na qualidade de vida (p = 0,006) dos participantes quando considerados os escores de todos os domĂ­nios do questionĂĄrio somados PRÉ (605,7) e PÓS (651,9) treinamento. Ainda, analisando de forma especĂ­fica, foi observada melhora com significĂąncia estatĂ­stica na capacidade funcional (p = 0,004), estado geral de saĂșde (p = 0,001) e aspectos emocionais (p = 0,02). CONCLUSÃO: O treinamento esportivo mostrou-se benĂ©fico, promove melhora na qualidade de vida de pessoas com lesĂŁo da medula espinhal que necessitam de cadeira de rodas para mobilidade e representa novos objetivos e desafios na continuidade no processo de reabilitação
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