|
|
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result sql = A methoxyflavonoid, chrysoeriol, selectively inhibits the formation of a carcinogenic estrogen metabolite in MCF-7 breast cancer cells.
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char = n;code = 110
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char = c;code = 99
char = e;code = 101
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char = l;code = 108
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char = ;code = 32
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char = s;code = 115
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char = e;code = 101
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char = o;code = 111
char = l;code = 108
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char = i;code = 105
char = d;code = 100
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char = o;code = 111
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char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = e;code = 101
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char = e;code = 101
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char = e;code = 101
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char = p;code = 112
char = r;code = 114
char = e;code = 101
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char = s;code = 115
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
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char = A;code = 65
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
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 = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
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 = f;code = 102
char = ;code = 32
char = 4;code = 52
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = ;code = 32
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = w;code = 119
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char = t;code = 116
char = h;code = 104
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char = u;code = 117
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char = a;code = 97
char = n;code = 110
char = y;code = 121
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char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
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char = s;code = 115
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
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 = f;code = 102
char = ;code = 32
char = 2;code = 50
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = ;code = 32
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
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char = o;code = 111
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char = w;code = 119
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char = r;code = 114
char = e;code = 101
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char = t;code = 116
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char = e;code = 101
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char = f;code = 102
char = i;code = 105
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char = s;code = 115
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char = ;code = 32
char = r;code = 114
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char = t;code = 116
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char = ;code = 32
char = s;code = 115
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char = o;code = 111
char = w;code = 119
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char = t;code = 116
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char = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
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char = p;code = 112
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char = e;code = 101
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char = 1;code = 49
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char = d;code = 100
char = ;code = 32
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char = r;code = 114
char = e;code = 101
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char = n;code = 110
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
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 = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = 4;code = 52
char = -;code = 45
char = O;code = 79
char = H;code = 72
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = .;code = 46
char = );code = 41
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = A 17beta-estradiol (E(2)) is hydrolyzed to 2-hydroxy-E(2) (2-OHE(2)) and 4-hydroxy-E(2) (4-OHE(2)) via cytochrome P450 (CYP) 1A1 and 1B1, respectively. In estrogen target tissues including the mammary gland, ovaries, and uterus, CYP1B1 is highly expressed, and 4-OHE(2) is predominantly formed in cancerous tissues. In this study, we investigated the inhibitory effects of chrysoeriol (luteorin-3'-methoxy ether), which is a natural methoxyflavonoid, against activity of CYP1A1 and 1B1 using in vitro and cultured cell techniques. Chrysoeriol selectively inhibited human recombinant CYP1B1-mediated 7-ethoxyresorufin-O-deethylation (EROD) activity 5-fold more than that of CYP1A1-mediated activity in a competitive manner. Additionally, chrysoeriol inhibited E(2) hydroxylation was catalyzed by CYP1B1, but not by CYP1A1. Methylation of 4-OHE(2), which is thought to be a detoxification process, was not affected by the presence of chrysoeriol. In human breast cancer MCF-7 cells, chrysoeriol did not affect the gene expression of CYP1A1 and 1B1, but significantly inhibited the formation of 4-methoxy E(2) without any effects on the formation of 2-methoxy E(2). In conclusion, we present the first report to show that chrysoeriol is a chemopreventive natural ingredient that can selectively inhibit CYP1B1 activity and prevent the formation of carcinogenic 4-OHE(2) from E(2.).
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = f;code = 102
char = l;code = 108
char = a;code = 97
char = v;code = 118
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = y;code = 121
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char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
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char = t;code = 116
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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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
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char = o;code = 111
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char = c;code = 99
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char = c;code = 99
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char = o;code = 111
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char = e;code = 101
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char = i;code = 105
char = c;code = 99
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char = e;code = 101
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = M;code = 77
char = C;code = 67
char = F;code = 70
char = -;code = 45
char = 7;code = 55
char = ;code = 32
char = b;code = 98
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = r;code = 114
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 = 46
result sql = A methoxyflavonoid, chrysoeriol, selectively inhibits the formation of a carcinogenic estrogen metabolite in MCF-7 breast cancer cells.
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char = c;code = 99
char = h;code = 104
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char = m;code = 109
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char = p;code = 112
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char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = u;code = 117
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = l;code = 108
char = u;code = 117
char = d;code = 100
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
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = m;code = 109
char = m;code = 109
char = a;code = 97
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = g;code = 103
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = u;code = 117
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 4;code = 52
char = -;code = 45
char = O;code = 79
char = H;code = 72
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = u;code = 117
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
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 = 44
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = g;code = 103
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 = e;code = 101
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 = o;code = 111
char = r;code = 114
char = y;code = 121
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 = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = (;code = 40
char = l;code = 108
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = 3;code = 51
char = ';code = 39
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = f;code = 102
char = l;code = 108
char = a;code = 97
char = v;code = 118
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = A;code = 65
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = n;code = 110
char = i;code = 105
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = h;code = 104
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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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 = e;code = 101
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = u;code = 117
char = m;code = 109
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = a;code = 97
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = 7;code = 55
char = -;code = 45
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = r;code = 114
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char = s;code = 115
char = o;code = 111
char = r;code = 114
char = u;code = 117
char = f;code = 102
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = O;code = 79
char = -;code = 45
char = d;code = 100
char = e;code = 101
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
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char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = (;code = 40
char = E;code = 69
char = R;code = 82
char = O;code = 79
char = D;code = 68
char = );code = 41
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
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char = 5;code = 53
char = -;code = 45
char = f;code = 102
char = o;code = 111
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char = d;code = 100
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = e;code = 101
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char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
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char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = A;code = 65
char = 1;code = 49
char = -;code = 45
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = a;code = 97
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char = e;code = 101
char = d;code = 100
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
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
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char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
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char = m;code = 109
char = a;code = 97
char = n;code = 110
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = d;code = 100
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
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 = e;code = 101
char = d;code = 100
char = ;code = 32
char = E;code = 69
char = (;code = 40
char = 2;code = 50
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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 = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = A;code = 65
char = 1;code = 49
char = .;code = 46
char = ;code = 32
char = M;code = 77
char = e;code = 101
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char = h;code = 104
char = y;code = 121
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char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 4;code = 52
char = -;code = 45
char = O;code = 79
char = H;code = 72
char = E;code = 69
char = (;code = 40
char = 2;code = 50
char = );code = 41
char = ,;code = 44
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char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
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char = i;code = 105
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char = t;code = 116
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char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = b;code = 98
char = e;code = 101
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = e;code = 101
char = t;code = 116
char = o;code = 111
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char = i;code = 105
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char = c;code = 99
char = a;code = 97
char = t;code = 116
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char = o;code = 111
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char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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char = n;code = 110
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char = t;code = 116
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
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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
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
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char = r;code = 114
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char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = h;code = 104
char = u;code = 117
char = m;code = 109
char = a;code = 97
char = n;code = 110
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char = b;code = 98
char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = M;code = 77
char = C;code = 67
char = F;code = 70
char = -;code = 45
char = 7;code = 55
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 = 44
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = o;code = 111
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = g;code = 103
char = e;code = 101
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char = e;code = 101
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char = e;code = 101
char = x;code = 120
char = p;code = 112
char = r;code = 114
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char = s;code = 115
char = s;code = 115
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 = C;code = 67
char = Y;code = 89
char = P;code = 80
char = 1;code = 49
char = A;code = 65
char = 1;code = 49
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = 1;code = 49
char = B;code = 66
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
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char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
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result sql = A 17beta-estradiol (E(2)) is hydrolyzed to 2-hydroxy-E(2) (2-OHE(2)) and 4-hydroxy-E(2) (4-OHE(2)) via cytochrome P450 (CYP) 1A1 and 1B1, respectively. In estrogen target tissues including the mammary gland, ovaries, and uterus, CYP1B1 is highly expressed, and 4-OHE(2) is predominantly formed in cancerous tissues. In this study, we investigated the inhibitory effects of chrysoeriol (luteorin-3'-methoxy ether), which is a natural methoxyflavonoid, against activity of CYP1A1 and 1B1 using in vitro and cultured cell techniques. Chrysoeriol selectively inhibited human recombinant CYP1B1-mediated 7-ethoxyresorufin-O-deethylation (EROD) activity 5-fold more than that of CYP1A1-mediated activity in a competitive manner. Additionally, chrysoeriol inhibited E(2) hydroxylation was catalyzed by CYP1B1, but not by CYP1A1. Methylation of 4-OHE(2), which is thought to be a detoxification process, was not affected by the presence of chrysoeriol. In human breast cancer MCF-7 cells, chrysoeriol did not affect the gene expression of CYP1A1 and 1B1, but significantly inhibited the formation of 4-methoxy E(2) without any effects on the formation of 2-methoxy E(2). In conclusion, we present the first report to show that chrysoeriol is a chemopreventive natural ingredient that can selectively inhibit CYP1B1 activity and prevent the formation of carcinogenic 4-OHE(2) from E(2.).
Publication: J. Steroid Biochem. Mol. Biol. 2010 Jan ;118(1-2)::70-6. :doi: 10.1016/j.jsbmb.2009.10.002.
Publication Date: 2010 Jan
Study Author(s): Takemura, Hitomi;Uchiyama, Harue;Ohura, Takeshi;Sakakibara, Hiroyuki;Kuruto, Ryoko;Amagai, Takashi;Shimoi, Kayoko;
Institution: Institute for Environmental Sciences, University of Shizuoka, Suruga, Shizuoka, Japan.
Shortcut link to this study:
Publication Date: 2010 Jan
Study Author(s): Takemura, Hitomi;Uchiyama, Harue;Ohura, Takeshi;Sakakibara, Hiroyuki;Kuruto, Ryoko;Amagai, Takashi;Shimoi, Kayoko;
Institution: Institute for Environmental Sciences, University of Shizuoka, Suruga, Shizuoka, Japan.
Shortcut link to this study:
A 17beta-estradiol (E(2)) is hydrolyzed to 2-hydroxy-E(2) (2-OHE(2)) and 4-hydroxy-E(2) (4-OHE(2)) via cytochrome P450 (CYP) 1A1 and 1B1, respectively. In estrogen target tissues including the mammary gland, ovaries, and uterus, CYP1B1 is highly expressed, and 4-OHE(2) is predominantly formed in cancerous tissues. In this study, we investigated the inhibitory effects of chrysoeriol (luteorin-3'-methoxy ether), which is a natural methoxyflavonoid, against activity of CYP1A1 and 1B1 using in vitro and cultured cell techniques. Chrysoeriol selectively inhibited human recombinant CYP1B1-mediated 7-ethoxyresorufin-O-deethylation (EROD) activity 5-fold more than that of CYP1A1-mediated activity in a competitive manner. Additionally, chrysoeriol inhibited E(2) hydroxylation was catalyzed by CYP1B1, but not by CYP1A1. Methylation of 4-OHE(2), which is thought to be a detoxification process, was not affected by the presence of chrysoeriol. In human breast cancer MCF-7 cells, chrysoeriol did not affect the gene expression of CYP1A1 and 1B1, but significantly inhibited the formation of 4-methoxy E(2) without any effects on the formation of 2-methoxy E(2). In conclusion, we present the first report to show that chrysoeriol is a chemopreventive natural ingredient that can selectively inhibit CYP1B1 activity and prevent the formation of carcinogenic 4-OHE(2) from E(2.).
PMID: 19833205
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