Potential pathways may involve the generation of reactive oxygen species [ 17, 20, 21], an effect on cellular NAD+ levels or sirtuin activity [ 10, 21– 23] or a decrease in cellular methylation potential (e.g. via lowering the SAM/SAH ratio) and resulting changes in protein and DNA methylation [ 10, 18, 24].
These data indicate that the antiproliferative effects of raxofelast in H2O2-stimulated rat aortic smooth muscle cells may involve the suppression of intracellular reactive oxygen species formation and the inhibition of ERKs by inactivation through PKC and MEK1,2 and down-regulation of c-myc expression, regardless of Ras activation.
Some evidence has suggested that lead may involve the direct formation of reactive oxygen species, depletion of the cellular antioxidant pool and have other effects.
The interaction of pathogen elicitors with host receptors (many of which may be encoded by resistance genes) likely activates a signal transduction cascade that may involve protein phosphorylation, ion fluxes, reactive oxygen species (ROS) and other signaling events.
The interaction of pathogen elicitors with host receptors likely activates a signal transduction cascade that may involve protein phosphorylation, ion fluxes, reactive oxygen species (ROS), and other signaling events [ 3, 4].
Upon pathogen detection, the activated defence responses in the plant may involve the rapid production of reactive oxygen species, hypersensitive response (HR) at the site of infection, strengthening of the cell wall by oxidative cross-linking of cell wall components, apposition of callose or phenolic compounds and the production of phytoalexins and pathogenesis-related proteins [ 1- 4].
The mechanisms that result in arterial ageing are uncertain but may involve an increased production of reactive oxygen species, which decrease the bioavailability of nitric oxide (NO), which is a molecule produced by the vascular endothelium that plays an important role in the regulation of vascular tone and function (3).
The variations can be related to the fact that cross-reactive species may involve both monomeric α-synuclein and its aggregated forms in these measurements.
Thus, cross-reactive immunity may involve cellular and/or humoral responses, but the humoral response seems to be CD4 independent.
The mechanisms leading to secondary coproporphyrinuria associated with chemical exposure may involve different mechanisms, including increase of reactive oxygen species generation in the liver, prooxidation of coproporphyrinogens, and coproporphyrinogen oxidase inhibition (Doss et al. 2000; Horie et al. 1987).
