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result sql = Protective mechanism of quercetin and rutin using glutathione metabolism on HO-induced oxidative stress in HepG2 cells.
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result sql = The levels of cellular glutathione (GSH) and reactive oxygen species (ROS) simultaneously determined by fluorometric measurement, may provide important information on pro-oxidative and antioxidative balance. The dual effect of quercetin antioxidant and pro-oxidant activity was proposed from different studies. Our study demonstrated that quercetin acted as an antioxidant in HepG2 cells when cells were treated with 10 and 100 micromol/L quercetin for 30 min, but quercetin acted as a pro-oxidant when cells were incubated at 100 micromol/L quercetin for longer periods (12 and 24 h). Quercetin is capable of reducing H(2)O(2)-induced oxidative stress of HepG2 cells through different mechanisms, such as detoxification of H(2)O(2,) inhibition of ROS generation, and removal of generated ROS. We find that quercetin can block ROS generation through Fenton reaction to produce hydroxyl radicals by chelating with transition metal ions such as Cu(2+). Evidence that quercetin might exert an antioxidant effect by changing generated ROS into less reactive ROS suggests that when quercetin reacts with ROS, it becomes oxidized, which is less harmful but still reactive, and the oxidized quercetin interacts with thiol compounds as reduced GSH to return to the parent compound quercetin. In contrast, the prolonged treatment of quercetin in high concentrations (100 micromol/L) shows that quercetin may act as a pro-oxidant rather than as an antioxidant, resulting in cell death (apoptosis).
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result sql = Protective mechanism of quercetin and rutin using glutathione metabolism on HO-induced oxidative stress in HepG2 cells.
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char = s;code = 115
char = i;code = 105
char = m;code = 109
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = e;code = 101
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = o;code = 111
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = y;code = 121
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = v;code = 118
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = -;code = 45
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
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 = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
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 = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = -;code = 45
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 = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = O;code = 79
char = u;code = 117
char = r;code = 114
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
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 = i;code = 105
char = n;code = 110
char = ;code = 32
char = H;code = 72
char = e;code = 101
char = p;code = 112
char = G;code = 71
char = 2;code = 50
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = /;code = 47
char = L;code = 76
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 3;code = 51
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = -;code = 45
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 = w;code = 119
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = u;code = 117
char = b;code = 98
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = /;code = 47
char = L;code = 76
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 1;code = 49
char = 2;code = 50
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 2;code = 50
char = 4;code = 52
char = ;code = 32
char = h;code = 104
char = );code = 41
char = .;code = 46
char = ;code = 32
char = Q;code = 81
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = p;code = 112
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = H;code = 72
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = -;code = 45
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
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 = H;code = 72
char = e;code = 101
char = p;code = 112
char = G;code = 71
char = 2;code = 50
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
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 = s;code = 115
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = O;code = 79
char = (;code = 40
char = 2;code = 50
char = ,;code = 44
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = R;code = 82
char = O;code = 79
char = S;code = 83
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = R;code = 82
char = O;code = 79
char = S;code = 83
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = k;code = 107
char = ;code = 32
char = R;code = 82
char = O;code = 79
char = S;code = 83
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = F;code = 70
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = C;code = 67
char = u;code = 117
char = (;code = 40
char = 2;code = 50
char = +;code = 43
char = );code = 41
char = .;code = 46
char = ;code = 32
char = E;code = 69
char = v;code = 118
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
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
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char = ;code = 32
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char = i;code = 105
char = t;code = 116
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char = f;code = 102
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char = l;code = 108
char = l;code = 108
char = ;code = 32
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char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ,;code = 44
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char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = q;code = 113
char = u;code = 117
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char = n;code = 110
char = d;code = 100
char = s;code = 115
char = ;code = 32
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char = e;code = 101
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char = G;code = 71
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char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = r;code = 114
char = e;code = 101
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char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = h;code = 104
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char = t;code = 116
char = ;code = 32
char = c;code = 99
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char = o;code = 111
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char = n;code = 110
char = d;code = 100
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char = n;code = 110
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char = ;code = 32
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char = t;code = 116
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char = ,;code = 44
char = ;code = 32
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char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
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char = d;code = 100
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result sql = The levels of cellular glutathione (GSH) and reactive oxygen species (ROS) simultaneously determined by fluorometric measurement, may provide important information on pro-oxidative and antioxidative balance. The dual effect of quercetin antioxidant and pro-oxidant activity was proposed from different studies. Our study demonstrated that quercetin acted as an antioxidant in HepG2 cells when cells were treated with 10 and 100 micromol/L quercetin for 30 min, but quercetin acted as a pro-oxidant when cells were incubated at 100 micromol/L quercetin for longer periods (12 and 24 h). Quercetin is capable of reducing H(2)O(2)-induced oxidative stress of HepG2 cells through different mechanisms, such as detoxification of H(2)O(2,) inhibition of ROS generation, and removal of generated ROS. We find that quercetin can block ROS generation through Fenton reaction to produce hydroxyl radicals by chelating with transition metal ions such as Cu(2+). Evidence that quercetin might exert an antioxidant effect by changing generated ROS into less reactive ROS suggests that when quercetin reacts with ROS, it becomes oxidized, which is less harmful but still reactive, and the oxidized quercetin interacts with thiol compounds as reduced GSH to return to the parent compound quercetin. In contrast, the prolonged treatment of quercetin in high concentrations (100 micromol/L) shows that quercetin may act as a pro-oxidant rather than as an antioxidant, resulting in cell death (apoptosis).
Publication: Ann. N. Y. Acad. Sci. 2009 Aug ;1171:530-7. :doi: 10.1111/j.1749-6632.2009.04690.x.
Publication Date: 2009 Aug
Study Author(s): Kim, Gyo-Nam;Jang, Hae-Dong;
Institution: Department of Food and Nutrition, Hannam University, Daejeon, Korea.
Shortcut link to this study:
Publication Date: 2009 Aug
Study Author(s): Kim, Gyo-Nam;Jang, Hae-Dong;
Institution: Department of Food and Nutrition, Hannam University, Daejeon, Korea.
Shortcut link to this study:
The levels of cellular glutathione (GSH) and reactive oxygen species (ROS) simultaneously determined by fluorometric measurement, may provide important information on pro-oxidative and antioxidative balance. The dual effect of quercetin antioxidant and pro-oxidant activity was proposed from different studies. Our study demonstrated that quercetin acted as an antioxidant in HepG2 cells when cells were treated with 10 and 100 micromol/L quercetin for 30 min, but quercetin acted as a pro-oxidant when cells were incubated at 100 micromol/L quercetin for longer periods (12 and 24 h). Quercetin is capable of reducing H(2)O(2)-induced oxidative stress of HepG2 cells through different mechanisms, such as detoxification of H(2)O(2,) inhibition of ROS generation, and removal of generated ROS. We find that quercetin can block ROS generation through Fenton reaction to produce hydroxyl radicals by chelating with transition metal ions such as Cu(2+). Evidence that quercetin might exert an antioxidant effect by changing generated ROS into less reactive ROS suggests that when quercetin reacts with ROS, it becomes oxidized, which is less harmful but still reactive, and the oxidized quercetin interacts with thiol compounds as reduced GSH to return to the parent compound quercetin. In contrast, the prolonged treatment of quercetin in high concentrations (100 micromol/L) shows that quercetin may act as a pro-oxidant rather than as an antioxidant, resulting in cell death (apoptosis).
PMID: 19723100
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