22 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
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
Actitud del odontólogo ante el hábito tabáquico
El tabaquismo es uno de los principales problemas de salud pública de los países desarrollados. A pesar de la extensa evidencia clínica y epidemiológica de sus efectos adversos sobre la salud oral y general, el abandono del tabaco no sigue una progresión nada alentadora. Durante los últimos años ha crecido el reconocimiento del importante papel del equipo odontológico en el cese del hábito tabáquico de sus pacientes. El objetivo de este trabajo es realizar una revisión de la evidencia existente sobre la efectividad de los programas de cese del hábito tabáquico desarrollados en la práctica odontológica, presentando estrategias y protocolos de actuación propuestos en los últimos años, para poder establecer una sistemática de actuación sobre los pacientes aplicable a la clínica diaria, que resulte factible y efectiva. Para ello se ha llevado a cabo una búsqueda bibliográfica sobre programas de cese del hábito tabáquico a nivel odontológico, así como de protocolos de actuación propuestos en los últimos años para estas intervenciones. Este trabajo concluye que existe una considerable evidencia científica que respalda la eficacia de los programas para el cese del hábito tabáquico aplicados en odontología. Se trata de intervenciones conductuales breves, que pueden complementarse con terapias farmacológicas, y de las que debe ser partícipe,todo el equipo odontológico