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Background   The antimicrobial activity of the  Equisetum arvense  L. extract and the mechanisms involved in the  in vitro  effects on endothelial vascular cells exposed to hyperosmotic stress were evaluated.Methods   Antimicrobial activity was evaluated by disk diffusion method and minimum inhibitory concentration (MIC) determination, and oxidative stress, inflammation, and apoptosis, in pretreatment with  Equisetum arvense  L., caffeic acid, and cathechin, were quantified.Results   The results have shown that  Equisetum arvense  L. exhibited antibacterial effects only on pathogenic gram-positive cocci. The modulatory activity of  Equisetum arvense  L. on endothelial cells exposed to hypertonic medium was different and depended on the concentration used. Low concentrations of tested compounds exerted antioxidant effect and diminished the activity of caspase-8 and also increased I κ B expression while in high doses,  Equisetum arvense  L. was prooxidant, induced apoptosis, and decreased IL-6 secretion.Conclusions   These experimental findings suggest that  Equisetum arvense  L. has antibacterial effects on gram-positive cocci and, administered in low dose, may be a new therapeutic approach for diseases associated with hypertonic conditions or oxidative stress and apoptosis.

oxidative medicine and cellular longevity

<i>Equisetum arvense</i>L. Extract Induces Antibacterial Activity and Modulates Oxidative Stress, Inflammation, and Apoptosis in Endothelial Vascular Cells Exposed to Hyperosmotic Stress

Equisetum arvenseL. Extract Induces Antibacterial Activity and Modulates Oxidative Stress, Inflammation, and Apoptosis in Endothelial Vascular Cells Exposed to Hyperosmotic Stress