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    Promotion of plasma membrane repair by vitamin E

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    Authors
    Howard, Amber Cyran
    McNeil, Anna K.
    McNeil, Paul L.
    Issue Date
    2011-12-20
    URI
    http://hdl.handle.net/10675.2/774
    
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    Abstract
    Severe vitamin E deficiency results in lethal myopathy in animal models. Membrane repair is an important myocyte response to plasma membrane disruption injury as when repair fails, myocytes die and muscular dystrophy ensues. Here we show that supplementation of cultured cells with α-tocopherol, the most common form of vitamin E, promotes plasma membrane repair. Conversely, in the absence of α-tocopherol supplementation, exposure of cultured cells to an oxidant challenge strikingly inhibits repair. Comparative measurements reveal that, to promote repair, an anti-oxidant must associate with membranes, as α-tocopherol does, or be capable of α-tocopherol regeneration. Finally, we show that myocytes in intact muscle cannot repair membranes when exposed to an oxidant challenge, but show enhanced repair when supplemented with vitamin E. Our work suggests a novel biological function for vitamin E in promoting myocyte plasma membrane repair. We propose that this function is essential for maintenance of skeletal muscle homeostasis.
    Citation
    Nat Commun. 2011 Dec 20; 2:597
    ae974a485f413a2113503eed53cd6c53
    10.1038/ncomms1594
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