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char = .;code = 46
result sql = Metabolic activation of 1,2-dibromo-3-chloropropane to mutagenic metabolites: detection and mechanism of formation of (Z)- and (E)-2-chloro-3-(bromomethyl)oxirane.
Metabolic activation of 1,2-dibromo-3-chloropropane to mutagenic metabolites: detection and mechanism of formation of (Z)- and (E)-2-chloro-3-(bromomethyl)oxirane.
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char = n;code = 110
char = t;code = 116
char = i;code = 105
char = c;code = 99
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char = t;code = 116
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char = d;code = 100
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = Q;code = 81
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = G;code = 71
char = C;code = 67
char = -;code = 45
char = M;code = 77
char = S;code = 83
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = d;code = 100
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = l;code = 108
char = o;code = 111
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
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 = (;code = 40
char = Z;code = 90
char = );code = 41
char = -;code = 45
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = (;code = 40
char = E;code = 69
char = );code = 41
char = -;code = 45
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
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 = 68
char = B;code = 66
char = C;code = 67
char = P;code = 80
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 = a;code = 97
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = u;code = 117
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = D;code = 68
char = B;code = 66
char = C;code = 67
char = P;code = 80
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = u;code = 117
char = t;code = 116
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 = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 3;code = 51
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
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 = Z;code = 90
char = -;code = 45
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = E;code = 69
char = -;code = 45
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = 3;code = 51
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 3;code = 51
char = 3;code = 51
char = ;code = 32
char = p;code = 112
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = /;code = 47
char = (;code = 40
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = .;code = 46
char = m;code = 109
char = g;code = 103
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
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
char = ,;code = 44
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 = 68
char = B;code = 66
char = C;code = 67
char = P;code = 80
char = ;;code = 59
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
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 = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = e;code = 101
char = p;code = 112
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
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 = b;code = 98
char = y;code = 121
char = ;code = 32
char = 5;code = 53
char = 0;code = 48
char = %;code = 37
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
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 = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = t;code = 116
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 = a;code = 97
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
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 = ;code = 32
char = l;code = 108
char = a;code = 97
char = b;code = 98
char = e;code = 101
char = l;code = 108
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 = d;code = 100
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 3;code = 51
char = .;code = 46
char = ;code = 32
char = B;code = 66
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = e;code = 101
char = p;code = 112
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = e;code = 101
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 = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = S;code = 83
char = .;code = 46
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = m;code = 109
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = T;code = 84
char = A;code = 65
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = 0;code = 48
char = .;code = 46
char = ;code = 32
char = (;code = 40
char = Z;code = 90
char = );code = 41
char = -;code = 45
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = w;code = 119
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = +;code = 43
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = /;code = 47
char = n;code = 110
char = m;code = 109
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = (;code = 40
char = E;code = 69
char = );code = 41
char = -;code = 45
char = C;code = 67
char = B;code = 66
char = P;code = 80
char = O;code = 79
char = .;code = 46
char = ;code = 32
char = O;code = 79
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 = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 2;code = 50
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = D;code = 68
char = B;code = 66
char = C;code = 67
char = P;code = 80
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = e;code = 101
char = d;code = 100
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
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 = a;code = 97
char = ;code = 32
char = b;code = 98
char = i;code = 105
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
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = k;code = 107
char = y;code = 121
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 = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = 1;code = 49
char = -;code = 45
char = b;code = 98
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = -;code = 45
char = 3;code = 51
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = m;code = 109
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = a;code = 97
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 = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = m;code = 109
char = -;code = 45
char = b;code = 98
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = .;code = 46
char = (;code = 40
char = A;code = 65
char = B;code = 66
char = S;code = 83
char = T;code = 84
char = R;code = 82
char = A;code = 65
char = C;code = 67
char = T;code = 84
char = ;code = 32
char = T;code = 84
char = R;code = 82
char = U;code = 85
char = N;code = 78
char = C;code = 67
char = A;code = 65
char = T;code = 84
char = E;code = 69
char = D;code = 68
char = ;code = 32
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = 2;code = 50
char = 5;code = 53
char = 0;code = 48
char = ;code = 32
char = W;code = 87
char = O;code = 79
char = R;code = 82
char = D;code = 68
char = S;code = 83
char = );code = 41
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = 1,2-Dibromo-3-chloropropane (DBCP), a haloalkane nematocide and soil fumigant, is metabolically activated to chemically reactive species that are direct-acting mutagens in a Salmonella typhimurium TA 100 test system. Studies in vitro with rat liver microsomes indicated that oxidation at carbon 3 resulted in the formation of an unstable gem-chlorohydrin that rearranged with elimination of hydrogen bromide to form (Z)-2-chloro-3-(bromomethyl)oxirane [(Z)-CBPO] and (E)-2-chloro-3-(bromomethyl)oxirane [(E)-CBPO]. Gas chromatography-mass spectrometry (GC-MS) with positive ion chemical ionization (CI) was employed to identify (Z)-CBPO and (E)-CBPO by comparison of characteristic fragment ions in their CI mass spectra with those observed for authentic standards. Quantitative GC-MS methodology was exploited to quantitate the rate of formation of (Z)-CBPO and (E)-CBPO from DBCP and analogues of DBCP specifically deuterated at carbon 1 and carbon 3. The rate of formation of Z- and E-isomers of CBPO was 31 and 33 pmol/(min.mg of protein), respectively, from DBCP; substitution with deuterium at carbon 1 increased the rate of epoxide formation by 50%, whereas CBPO formation could not be detected from a substrate labeled with deuterium at carbon 3. Both epoxides were directly acting mutagens to S. typhimurium TA 100. (Z)-CBPO caused approximately twice as many his+ revertants/nmol compared to (E)-CBPO. Oxidation at carbon 2 of DBCP resulted in the formation of a bifunctional alkylating agent, 1-bromo-3-chloroacetone, presumably via the intermediacy of an unstable gem-bromohydrin.(ABSTRACT TRUNCATED AT 250 WORDS)

Publication: Chem. Res. Toxicol. 1990 Sep-Oct ;3(5)::458-66.
Publication Date: 1990 Sep-Oct
Study Author(s): Pearson, P G;Omichinski, J G;Myers, T G;Søderlund, E J;Dybing, E;Nelson, S D;
Institution: Department of Medicinal Chemistry, School of Pharmacy, University of Washington, Seattle 98195.
Shortcut link to this study:
1,2-Dibromo-3-chloropropane (DBCP), a haloalkane nematocide and soil fumigant, is metabolically activated to chemically reactive species that are direct-acting mutagens in a Salmonella typhimurium TA 100 test system. Studies in vitro with rat liver microsomes indicated that oxidation at carbon 3 resulted in the formation of an unstable gem-chlorohydrin that rearranged with elimination of hydrogen bromide to form (Z)-2-chloro-3-(bromomethyl)oxirane [(Z)-CBPO] and (E)-2-chloro-3-(bromomethyl)oxirane [(E)-CBPO]. Gas chromatography-mass spectrometry (GC-MS) with positive ion chemical ionization (CI) was employed to identify (Z)-CBPO and (E)-CBPO by comparison of characteristic fragment ions in their CI mass spectra with those observed for authentic standards. Quantitative GC-MS methodology was exploited to quantitate the rate of formation of (Z)-CBPO and (E)-CBPO from DBCP and analogues of DBCP specifically deuterated at carbon 1 and carbon 3. The rate of formation of Z- and E-isomers of CBPO was 31 and 33 pmol/(min.mg of protein), respectively, from DBCP; substitution with deuterium at carbon 1 increased the rate of epoxide formation by 50%, whereas CBPO formation could not be detected from a substrate labeled with deuterium at carbon 3. Both epoxides were directly acting mutagens to S. typhimurium TA 100. (Z)-CBPO caused approximately twice as many his+ revertants/nmol compared to (E)-CBPO. Oxidation at carbon 2 of DBCP resulted in the formation of a bifunctional alkylating agent, 1-bromo-3-chloroacetone, presumably via the intermediacy of an unstable gem-bromohydrin.(ABSTRACT TRUNCATED AT 250 WORDS)
PMID: 2133097

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