char = P;code = 80
char = r;code = 114
char = o;code = 111
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char = i;code = 105
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = a;code = 97
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char = i;code = 105
char = n;code = 110
char = g;code = 103
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char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = t;code = 116
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char = r;code = 114
char = e;code = 101
char = -;code = 45
char = o;code = 111
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char = e;code = 101
char = r;code = 114
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char = e;code = 101
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char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = n;code = 110
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = p;code = 112
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = o;code = 111
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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 = ;code = 32
char = c;code = 99
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = s;code = 115
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 = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = .;code = 46
result sql = Proliferative signaling by store-operated calcium channels opposes colon cancer cell cytostasis induced by bacterial enterotoxins.
Proliferative signaling by store-operated calcium channels opposes colon cancer cell cytostasis induced by bacterial enterotoxins.
char = G;code = 71
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char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
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char = f;code = 102
char = ;code = 32
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char = M;code = 77
char = P;code = 80
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char = l;code = 108
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char = h;code = 104
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char = -;code = 45
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char = b;code = 98
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char = e;code = 101
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char = o;code = 111
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char = ;code = 32
char = (;code = 40
char = S;code = 83
char = T;code = 84
char = s;code = 115
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char = ;code = 32
char = p;code = 112
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char = m;code = 109
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char = t;code = 116
char = e;code = 101
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char = c;code = 99
char = o;code = 111
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char = a;code = 97
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char = c;code = 99
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char = l;code = 108
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char = i;code = 105
char = s;code = 115
char = ,;code = 44
char = ;code = 32
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
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char = m;code = 109
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char = p;code = 112
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char = C;code = 67
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char = r;code = 114
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char = g;code = 103
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char = s;code = 115
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char = (;code = 40
char = S;code = 83
char = O;code = 79
char = C;code = 67
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char = i;code = 105
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char = c;code = 99
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char = l;code = 108
char = ;code = 32
char = p;code = 112
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char = .;code = 46
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char = T;code = 84
char = h;code = 104
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char = p;code = 112
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char = S;code = 83
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char = 8;code = 56
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char = t;code = 116
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = a;code = 97
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 = 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 = g;code = 103
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = y;code = 121
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 = S;code = 83
char = O;code = 79
char = C;code = 67
char = s;code = 115
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 = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = -;code = 45
char = A;code = 65
char = T;code = 84
char = P;code = 80
char = a;code = 97
char = s;code = 115
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 = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = p;code = 112
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = U;code = 85
char = T;code = 84
char = P;code = 80
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = h;code = 104
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 = g;code = 103
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = -;code = 45
char = d;code = 100
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = G;code = 71
char = M;code = 77
char = P;code = 80
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = m;code = 109
char = u;code = 117
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 = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = i;code = 105
char = s;code = 115
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 = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = k;code = 107
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = m;code = 109
char = y;code = 121
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = k;code = 107
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = 2;code = 50
char = -;code = 45
char = A;code = 65
char = P;code = 80
char = B;code = 66
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = 1;code = 49
char = ,;code = 44
char = 2;code = 50
char = -;code = 45
char = b;code = 98
char = i;code = 105
char = s;code = 115
char = (;code = 40
char = o;code = 111
char = -;code = 45
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = -;code = 45
char = 5;code = 53
char = ,;code = 44
char = 5;code = 53
char = ';code = 39
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = b;code = 98
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = );code = 41
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = e;code = 101
char = -;code = 45
char = N;code = 78
char = ,;code = 44
char = N;code = 78
char = ,;code = 44
char = N;code = 78
char = ';code = 39
char = ,;code = 44
char = N;code = 78
char = ';code = 39
char = -;code = 45
char = t;code = 116
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = -;code = 45
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = y;code = 121
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = (;code = 40
char = B;code = 66
char = A;code = 65
char = P;code = 80
char = T;code = 84
char = A;code = 65
char = -;code = 45
char = A;code = 65
char = M;code = 77
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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 = o;code = 111
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = .;code = 46
char = ;code = 32
char = M;code = 77
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = u;code = 117
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 = b;code = 98
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = p;code = 112
char = a;code = 97
char = c;code = 99
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 = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = f;code = 102
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = g;code = 103
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = -;code = 45
char = d;code = 100
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = ;code = 32
char = t;code = 116
char = o;code = 111
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 = b;code = 98
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
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 = 46
char = ;code = 32
char = A;code = 65
char = l;code = 108
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 = ;code = 32
char = b;code = 98
char = a;code = 97
char = s;code = 115
char = a;code = 97
char = l;code = 108
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 = t;code = 116
char = i;code = 105
char = c;code = 99
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 = r;code = 114
char = e;code = 101
char = f;code = 102
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = S;code = 83
char = T;code = 84
char = -;code = 45
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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 = b;code = 98
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = i;code = 105
char = u;code = 117
char = m;code = 109
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 = a;code = 97
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char = t;code = 116
char = a;code = 97
char = g;code = 103
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = -;code = 45
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 = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = s;code = 115
char = e;code = 101
char = r;code = 114
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 = s;code = 115
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 = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = u;code = 117
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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = c;code = 99
char = l;code = 108
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = p;code = 112
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
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result sql = Guanylyl cyclase C and accumulation of cGMP induced by bacterial heat-stable enterotoxins (STs) promote colon cancer cell cytostasis, serving as a tumor suppressor in intestine. Conversely, capacitative calcium entry through store-operated calcium channels (SOCs) is a key signaling mechanism that promotes colon cancer cell proliferation. The present study revealed that proliferative signaling by capacitative calcium entry through SOCs opposes and is reciprocally coupled to cytostasis mediated by guanylyl cyclase C in T84 human colon carcinoma cells. Elimination of capacitative calcium entry employing 2-aminoethoxydiphenylborate (2-APB), a selective inhibitor of SOCs, potentiated cytostasis induced by ST. Opposition of ST-induced cytostasis by capacitative calcium entry reflects reciprocal inhibition of guanylyl cyclase C signaling. Calcium entry through SOCs induced by the calcium-ATPase inhibitor thapsigargin or the receptor agonists UTP or carbachol inhibited guanylyl cyclase C-dependent cGMP accumulation. This effect was mimicked by the calcium ionophore ionomycin and blocked by 2-APB and intracellular 1,2-bis(o-amino-5,5'-dibromophenoxy)ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl ester (BAPTA-AM), a chelator of calcium. Moreover, regulation by capacitative calcium entry reflected ligand-dependent sensitization of guanylyl cyclase C to inhibition by that cation. Although basal catalytic activity was refractory, ST-stimulated guanylyl cyclase C was inhibited by calcium, which antagonized binding of magnesium to allosteric sites required for receptor-effector coupling. These observations demonstrate that reciprocal regulation of guanylyl cyclase C signaling by capacitative calcium entry through SOCs represents one limb of a coordinated mechanism balancing colon cancer cell proliferation and cytostasis. They suggest that combining guanylyl cyclase C agonists and SOC inhibitors offers a novel paradigm for cGMP-directed therapy and prevention for colorectal tumors.

Publication: J. Pharmacol. Exp. Ther. 2005 Sep ;314(3)::1013-22.
Publication Date: 2005 Sep
Study Author(s): Kazerounian, Shiva;Pitari, Giovanni M;Shah, Fawad J;Frick, Glen S;Madesh, Muniswamy;Ruiz-Stewart, Inez;Schulz, Stephanie;Hajnóczky, Gyorgy;Waldman, Scott A;
Institution: Division of Clinical Pharmacology, Department of Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Shortcut link to this study:
Guanylyl cyclase C and accumulation of cGMP induced by bacterial heat-stable enterotoxins (STs) promote colon cancer cell cytostasis, serving as a tumor suppressor in intestine. Conversely, capacitative calcium entry through store-operated calcium channels (SOCs) is a key signaling mechanism that promotes colon cancer cell proliferation. The present study revealed that proliferative signaling by capacitative calcium entry through SOCs opposes and is reciprocally coupled to cytostasis mediated by guanylyl cyclase C in T84 human colon carcinoma cells. Elimination of capacitative calcium entry employing 2-aminoethoxydiphenylborate (2-APB), a selective inhibitor of SOCs, potentiated cytostasis induced by ST. Opposition of ST-induced cytostasis by capacitative calcium entry reflects reciprocal inhibition of guanylyl cyclase C signaling. Calcium entry through SOCs induced by the calcium-ATPase inhibitor thapsigargin or the receptor agonists UTP or carbachol inhibited guanylyl cyclase C-dependent cGMP accumulation. This effect was mimicked by the calcium ionophore ionomycin and blocked by 2-APB and intracellular 1,2-bis(o-amino-5,5'-dibromophenoxy)ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl ester (BAPTA-AM), a chelator of calcium. Moreover, regulation by capacitative calcium entry reflected ligand-dependent sensitization of guanylyl cyclase C to inhibition by that cation. Although basal catalytic activity was refractory, ST-stimulated guanylyl cyclase C was inhibited by calcium, which antagonized binding of magnesium to allosteric sites required for receptor-effector coupling. These observations demonstrate that reciprocal regulation of guanylyl cyclase C signaling by capacitative calcium entry through SOCs represents one limb of a coordinated mechanism balancing colon cancer cell proliferation and cytostasis. They suggest that combining guanylyl cyclase C agonists and SOC inhibitors offers a novel paradigm for cGMP-directed therapy and prevention for colorectal tumors.
PMID: 15937149

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