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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

d-alpha-tocopherol inhibition of vascular smooth muscle cell proliferation occurs at physiological concentrations, correlates with protein kinase C inhibition, and is independent of its antioxidant properties.

d-alpha-Tocopherol, but not d-beta-tocopherol, negatively regulates proliferation of vascular smooth muscle cells at physiological concentrations. d-alpha-Tocopherol inhibits protein kinase C ( PKC) activity, whereas d-beta-tocopherol is ineffective. Furthermore d-beta-tocopherol prevents the inhibition of cell growth and of PKC activity caused by d-alpha-tocopherol. The negative regulation by d-alpha-tocopherol of PKC activity appears to be the cause and not the effect of smooth muscle cell growth inhibition. d-alpha-Tocopherol does not act by binding to PKC directly but presumably by preventing PKC activation. It is concluded that, in vascular smooth muscle cells, d-alpha-tocopherol acts specifically through a nonantioxidant mechanism and exerts a negative control on a signal transduction pathway regulating cell proliferation.[1]


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