Attitudes toward use of hearing protection devices and effects of an intervention on fit-testing results.

This study assessed attitudes toward the use of hearing protection devices (HPDs) and the effect of an educational intervention on fit-testing results by comparing personal attenuation ratings (PAR50) before and after the intervention. Employees (n = 327) from a large metal container manufacturer at four geographic locations were tested with a field attenuation estimation system (FAES) to identify workers (n = 91) requiring intervention. PAR50 values significantly increased from baseline to post-intervention (p < .

F2-isoprostane receptors on hepatic stellate cells.

F2-isoprostanes are considered as the most reliable markers of oxidative stress and can be used to evaluate the oxidative status in a number of human pathologies. Besides being markers of oxidative stress, F2-isoprostanes proved to be mediators of important biological effects and would act through the activation of receptors analogous to those for thromboxane A2. In a previous work, we provided evidence that F(2)-isoprostanes, generated during carbon tetrachloride-induced hepatic fibrosis, mediate hepatic stellate cell (HSC) proliferation and collagen hyperproduction.

Isoprostanes and hepatic fibrosis.

After a brief introduction to oxidative stress, the discovery of F(2)-isoprostanes as specific and reliable markers of oxidative stress is described. Isoprostanes are also agonists of important biological effects. Since a relation between oxidative stress and collagen hyperproduction has been previously suggested and since lipid peroxidation products have been proposed as possible mediators of liver fibrosis, we investigated whether collagen synthesis is induced by F(2)-isoprostanes the most proximal products of lipid peroxidation.

F2-isoprostanes are not just markers of oxidative stress.

F(2)-isoprostanes are not just markers of oxidative stress. The discovery of F(2)-isoprostanes (F(2)-IsoPs) as specific and reliable markers of oxidative stress in vivo is briefly summarized here. F(2)-IsoPs are also agonists of important biological effects, such as the vasoconstriction of renal glomerular arterioles, the retinal vessel, and the brain microcirculature.

F2-isoprostanes stimulate collagen synthesis in activated hepatic stellate cells: a link with liver fibrosis?

Carbon tetrachloride (CCl4)-induced hepatic fibrosis has been considered to be linked to oxidative stress and mediated by aldehydic lipid peroxidation products. In the present study, we investigated whether collagen synthesis is induced by F2-isoprostanes, the most proximal products of lipid peroxidation and known mediators of important biological effects. By contrast with aldehydes, F2-isoprostanes act through receptors able to elicit definite signal transduction pathways.