Influence of vitamin C and vitamin E on redox signaling: Implications for exercise adaptations |
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| Institution: | 1. Division of Sport and Exercise Sciences, Abertay University, Dundee, UK, DD1 1HG;2. Research Institute for Sport and Eqxercise Science, Liverpool John Moores University, Liverpool, UK, L3 3AF;3. School of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Serres, Greece;1. Department of Psychiatry, Psychotherapy, and Psychosomatic Medicine, Evangelisches Krankenhaus Castrop-Rauxel, Academic Teaching Hospital of the University Duisburg-Essen, Castrop-Rauxel, Germany;2. Department of Psychiatry and Psychotherapy, Faculty of Medicine, LVR-Hospital Essen, University of Duisburg-Essen, Essen, Germany;1. Department of Surgery, Liverpool Hospital, Sydney, NSW, Australia;2. Western Sydney University, Sydney, NSW, Australia;3. The MARCS Institute for Brain, Behaviour and Development, Sydney, NSW, Australia;4. Faculty of Medicine, Department of Surgery, University of New South Wales, Sydney, NSW, Australia;1. Department for Sport and Exercise Sciences, Abertay University, 40 Bell Street, Dundee, Scotland DD1 1HG, UK;2. Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Liverpool, England L3 3AF, UK;3. Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, CF37 4AT, UK;4. Faculty of Medicine, Reichwald Health Sciences Centre, University of British Columbia-Okanagan, Kelowna, British Columbia, Canada;5. Sport and Exercise Science Research Institute, Ulster University, Belfast, BT37 OQB, UK;1. Trakia University, Stara Zagora 6000, Bulgaria;2. Szent Istvan University, Gödöllo H-2103, Hungary;3. Sumy National Agrarian University, Sumy 40021, Ukraine;4. Odessa National Academy of Food Technology, Odessa 65039, Ukraine;5. Russian Academy of Science, Moscow 119991, Russia;6. All-Russian Institute of Poultry Husbandry, Sergiev Posad 141311, Russia;7. Department of Animal Science, Faculty of Agriculture, University of Yuzuncu Yil, Van 65080, Turkey |
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| Abstract: | The exogenous antioxidants vitamin C (ascorbate) and vitamin E (α-tocopherol) often blunt favorable cell signaling responses to exercise, suggesting that redox signaling contributes to exercise adaptations. Current theories posit that this antioxidant paradigm interferes with redox signaling by attenuating exercise-induced reactive oxygen species (ROS) and reactive nitrogen species (RNS) generation. The well-documented in vitro antioxidant actions of ascorbate and α-tocopherol and characterization of the type and source of the ROS/RNS produced during exercise theoretically enable identification of redox-dependent mechanisms responsible for the blunting of favorable cell signaling responses to exercise. This review aimed to apply this reasoning to determine how the aforementioned antioxidants might attenuate exercise-induced ROS/RNS production. The principal outcomes of this analysis are (1) neither antioxidant is likely to attenuate nitric oxide signaling either directly (reaction with nitric oxide) or indirectly (reaction with derivatives, e.g., peroxynitrite); (2) neither antioxidant reacts appreciably with hydrogen peroxide, a key effector of redox signaling; (3) ascorbate but not α-tocopherol has the capacity to attenuate exercise-induced superoxide generation; and (4) alternate mechanisms, namely pro-oxidant side reactions and/or reduction of bioactive oxidized macromolecule adducts, are unlikely to interfere with exercise-induced redox signaling. Out of all the possibilities considered, ascorbate-mediated suppression of superoxide generation with attendant implications for hydrogen peroxide signaling is arguably the most cogent explanation for blunting of favorable cell signaling responses to exercise. However, this mechanism is dependent on ascorbate accumulating at sites rich in NADPH oxidases, principal contributors to contraction-mediated superoxide generation, and outcompeting nitric oxide and superoxide dismutase isoforms. The major conclusions of this review are: (1) direct evidence for interference of ascorbate and α-tocopherol with exercise-induced ROS/RNS production is lacking; (2) theoretical analysis reveals that both antioxidants are unlikely to have a major impact on exercise-induced redox signaling; and (3) it is worth considering alternate redox-independent mechanisms. |
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| Keywords: | Vitamin C Vitamin E Antioxidant Reactive oxygen species Reactive nitrogen species Exercise adaptations Oxidative stress |
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