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result sql = Vitamin C is an essential antioxidant that enhances survival of oxidatively stressed human vascular endothelial cells in the presence of a vast molar excess of glutathione.
Vitamin C is an essential antioxidant that enhances survival of oxidatively stressed human vascular endothelial cells in the presence of a vast molar excess of glutathione.
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char = l;code = 108
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char = l;code = 108
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char = i;code = 105
char = t;code = 116
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
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char = C;code = 67
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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char = r;code = 114
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char = e;code = 101
char = d;code = 100
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char = h;code = 104
char = ;code = 32
char = a;code = 97
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char = m;code = 109
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = s;code = 115
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = i;code = 105
char = m;code = 109
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char = l;code = 108
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = e;code = 101
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char = u;code = 117
char = s;code = 115
char = ;code = 32
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char = l;code = 108
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = o;code = 111
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char = i;code = 105
char = d;code = 100
char = a;code = 97
char = n;code = 110
char = t;code = 116
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char = s;code = 115
char = p;code = 112
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char = c;code = 99
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char = e;code = 101
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char = r;code = 114
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char = f;code = 102
char = o;code = 111
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char = ;code = 32
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char = n;code = 110
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char = e;code = 101
char = n;code = 110
char = d;code = 100
char = o;code = 111
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char = h;code = 104
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
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char = l;code = 108
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char = u;code = 117
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char = e;code = 101
char = r;code = 114
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char = d;code = 100
char = a;code = 97
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char = i;code = 105
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char = c;code = 99
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char = l;code = 108
char = l;code = 108
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char = e;code = 101
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char = t;code = 116
char = a;code = 97
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char = i;code = 105
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char = ;code = 32
char = f;code = 102
char = u;code = 117
char = n;code = 110
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = a;code = 97
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char = c;code = 99
char = e;code = 101
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char = l;code = 108
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = l;code = 108
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = n;code = 110
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result sql = Cellular glutathione levels may exceed vitamin C levels by 10-fold, generating the question about the real antioxidant role that low intracellular concentrations of vitamin C can play in the presence of a vast molar excess of glutathione. We characterized the metabolism of vitamin C and its relationship with glutathione in primary cultures of human endothelial cells oxidatively challenged by treatment with hydrogen peroxide or with activated cells undergoing the respiratory burst, and analyzed the manner in which vitamin C interacts with glutathione to increase the antioxidant capacity of cells. OUR DATA INDICATE THAT: (i) endothelial cells express transporters for reduced and oxidized vitamin C and accumulate ascorbic acid with participation of glutathione-dependent dehydroascorbic acid reductases, (ii) although increased intracellular levels of vitamin C or glutathione caused augmented resistance to oxidative stress, 10-times more glutathione than vitamin C was required, (iii) full antioxidant protection required the simultaneous presence of intracellular and extracellular vitamin C at concentrations normally found in vivo, and (iv) intracellular vitamin C cooperated in enhancing glutathione recovery after oxidative challenge thus providing cells with enhanced survival potential, while extracellular vitamin C was recycled through a mechanism involving the simultaneous neutralization of oxidant species. Therefore, in endothelial cells under oxidative challenge, vitamin C functions as an essential cellular antioxidant even in the presence of a vast molar excess of glutathione.

Publication: J. Biol. Chem. 2007 May 25 ;282(21)::15506-15.
Publication Date: 2007 May 25
Study Author(s): Montecinos, Viviana;Guzmán, Paula;Barra, Valeria;Villagrán, Marcelo;Muñoz-Montesino, Carola;Sotomayor, Kirsty;Escobar, Elizabeth;Godoy, Alejandro;Mardones, Lorena;Sotomayor, Paula;Guzmán, Catherine;Vásquez, Osmán;Gallardo, Victoria;van Zundert, Brigitte;Bono, María Rosa;Oñate, Sergio A;Bustamante, Marcelo;Cárcamo, Juan G;Rivas, Coralia I;Vera, Juan Carlos;
Institution: Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160C, Concepción, Chile.
Shortcut link to this study:
Cellular glutathione levels may exceed vitamin C levels by 10-fold, generating the question about the real antioxidant role that low intracellular concentrations of vitamin C can play in the presence of a vast molar excess of glutathione. We characterized the metabolism of vitamin C and its relationship with glutathione in primary cultures of human endothelial cells oxidatively challenged by treatment with hydrogen peroxide or with activated cells undergoing the respiratory burst, and analyzed the manner in which vitamin C interacts with glutathione to increase the antioxidant capacity of cells. OUR DATA INDICATE THAT: (i) endothelial cells express transporters for reduced and oxidized vitamin C and accumulate ascorbic acid with participation of glutathione-dependent dehydroascorbic acid reductases, (ii) although increased intracellular levels of vitamin C or glutathione caused augmented resistance to oxidative stress, 10-times more glutathione than vitamin C was required, (iii) full antioxidant protection required the simultaneous presence of intracellular and extracellular vitamin C at concentrations normally found in vivo, and (iv) intracellular vitamin C cooperated in enhancing glutathione recovery after oxidative challenge thus providing cells with enhanced survival potential, while extracellular vitamin C was recycled through a mechanism involving the simultaneous neutralization of oxidant species. Therefore, in endothelial cells under oxidative challenge, vitamin C functions as an essential cellular antioxidant even in the presence of a vast molar excess of glutathione.
PMID: 17403685

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