char = G;code = 71
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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
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char = ;code = 32
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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 = p;code = 112
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = p;code = 112
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = 7;code = 55
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = -;code = 45
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 = c;code = 99
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = l;code = 108
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 = a;code = 97
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = U;code = 85
char = 9;code = 57
char = 3;code = 51
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 = 46
result sql = Generation of an oxidative stress precedes caspase activation during 7beta-hydroxycholesterol-induced apoptosis in U937 cells.
Generation of an oxidative stress precedes caspase activation during 7beta-hydroxycholesterol-induced apoptosis in U937 cells.
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = 7;code = 55
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = -;code = 45
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 = c;code = 99
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = ;code = 32
char = (;code = 40
char = 7;code = 55
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = -;code = 45
char = O;code = 79
char = H;code = 72
char = );code = 41
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = n;code = 110
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char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
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 = ;code = 32
char = a;code = 97
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = m;code = 109
char = b;code = 98
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = f;code = 102
char = u;code = 117
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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 = ;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 = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
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char = o;code = 111
char = l;code = 108
char = ;code = 32
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 = s;code = 115
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
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
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 = e;code = 101
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
char = n;code = 110
char = e;code = 101
char = r;code = 114
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char = t;code = 116
char = i;code = 105
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char = n;code = 110
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = o;code = 111
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char = i;code = 105
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = i;code = 105
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char = e;code = 101
char = ;code = 32
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char = t;code = 116
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = d;code = 100
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = b;code = 98
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 = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = t;code = 116
char = o;code = 111
char = c;code = 99
char = h;code = 104
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = A;code = 65
char = p;code = 112
char = a;code = 97
char = f;code = 102
char = -;code = 45
char = 1;code = 49
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
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 = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = p;code = 112
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = p;code = 112
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = -;code = 45
char = 9;code = 57
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 = n;code = 110
char = ;code = 32
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = p;code = 112
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = -;code = 45
char = 3;code = 51
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char = u;code = 117
char = l;code = 108
char = t;code = 116
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 = l;code = 108
char = e;code = 101
char = a;code = 97
char = d;code = 100
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char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
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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 = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = l;code = 108
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char = (;code = 40
char = A;code = 65
char = D;code = 68
char = P;code = 80
char = -;code = 45
char = r;code = 114
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char = b;code = 98
char = o;code = 111
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char = e;code = 101
char = );code = 41
char = ;code = 32
char = p;code = 112
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char = y;code = 121
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char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = A;code = 65
char = R;code = 82
char = P;code = 80
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = o;code = 111
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char = e;code = 101
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char = ;code = 32
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char = e;code = 101
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char = e;code = 101
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char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
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char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = i;code = 105
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char = e;code = 101
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char = i;code = 105
char = g;code = 103
char = a;code = 97
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char = e;code = 101
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char = t;code = 116
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char = s;code = 115
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char = l;code = 108
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char = w;code = 119
char = a;code = 97
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char = b;code = 98
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char = O;code = 79
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char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
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char = ;code = 32
char = U;code = 85
char = 9;code = 57
char = 3;code = 51
char = 7;code = 55
char = ;code = 32
char = c;code = 99
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char = l;code = 108
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char = h;code = 104
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char = a;code = 97
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char = m;code = 109
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char = n;code = 110
char = o;code = 111
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char = o;code = 111
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char = ;code = 32
char = c;code = 99
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char = l;code = 108
char = l;code = 108
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char = l;code = 108
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char = e;code = 101
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char = k;code = 107
char = n;code = 110
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char = w;code = 119
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = u;code = 117
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char = e;code = 101
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char = o;code = 111
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char = a;code = 97
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char = o;code = 111
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char = u;code = 117
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char = m;code = 109
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char = w;code = 119
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char = t;code = 116
char = h;code = 104
char = ;code = 32
char = 7;code = 55
char = b;code = 98
char = e;code = 101
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char = a;code = 97
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char = O;code = 79
char = H;code = 72
char = ,;code = 44
char = ;code = 32
char = o;code = 111
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char = e;code = 101
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char = a;code = 97
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char = t;code = 116
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char = c;code = 99
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char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 4;code = 52
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result sql = The oxysterol 7beta-hydroxycholesterol (7beta-OH) has been shown to induce apoptosis in a number of cell lines. Though not fully elucidated, the mechanism through which this oxysterol induces cell death is thought to involve the generation of an oxidative stress leading to perturbation of the mitochondrion and release of cytochrome c into the cytosol. Cytochrome c together with Apaf-1 causes activation of the initiator caspase, caspase-9, which in turn activates caspase-3 ultimately leading to the degradation of poly(ADP-ribose) polymerase (PARP). The objective of the present study was to investigate the signalling pathway in 7beta-OH-induced apoptosis in U937 cells, a human monocytic blood cell line known to undergo apoptosis upon treatment with 7beta-OH, over a time course of 48 h. Apoptosis was evident after 24 h incubation. Glutathione levels were decreased after 6 h and this was coupled with an increase in SOD activity. Through western blot analysis we examined expression of caspase-3, -8, and -9 and cleavage of the caspase-3 substrate PARP. The sequence proceeded with activation of caspase-9 after 9 h, caspase-3 at the 12 h timepoint, and cleavage of PARP after 24 h treatment with 7beta-OH. Caspase-8 did not appear to play a major role in this particular apoptotic pathway.

Publication: J. Biochem. Mol. Toxicol. 2004 ;18(1)::50-9.
Publication Date: 2004
Study Author(s): Ryan, Lisa;O'Callaghan, Yvonne C;O'Brien, Nora M;
Institution: Department of Food and Nutritional Sciences, University College Cork, Cork, Ireland.
Shortcut link to this study:
The oxysterol 7beta-hydroxycholesterol (7beta-OH) has been shown to induce apoptosis in a number of cell lines. Though not fully elucidated, the mechanism through which this oxysterol induces cell death is thought to involve the generation of an oxidative stress leading to perturbation of the mitochondrion and release of cytochrome c into the cytosol. Cytochrome c together with Apaf-1 causes activation of the initiator caspase, caspase-9, which in turn activates caspase-3 ultimately leading to the degradation of poly(ADP-ribose) polymerase (PARP). The objective of the present study was to investigate the signalling pathway in 7beta-OH-induced apoptosis in U937 cells, a human monocytic blood cell line known to undergo apoptosis upon treatment with 7beta-OH, over a time course of 48 h. Apoptosis was evident after 24 h incubation. Glutathione levels were decreased after 6 h and this was coupled with an increase in SOD activity. Through western blot analysis we examined expression of caspase-3, -8, and -9 and cleavage of the caspase-3 substrate PARP. The sequence proceeded with activation of caspase-9 after 9 h, caspase-3 at the 12 h timepoint, and cleavage of PARP after 24 h treatment with 7beta-OH. Caspase-8 did not appear to play a major role in this particular apoptotic pathway.
PMID: 14994280

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