char = R;code = 82
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = P;code = 80
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char = g;code = 103
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char = y;code = 121
char = c;code = 99
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char = r;code = 114
char = o;code = 111
char = t;code = 116
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char = i;code = 105
char = n;code = 110
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char = m;code = 109
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char = a;code = 97
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char = e;code = 101
char = d;code = 100
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char = m;code = 109
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char = r;code = 114
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char = s;code = 115
char = i;code = 105
char = s;code = 115
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char = a;code = 97
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char = c;code = 99
char = e;code = 101
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char = b;code = 98
char = y;code = 121
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = u;code = 117
char = l;code = 108
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = x;code = 120
char = o;code = 111
char = r;code = 114
char = u;code = 117
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = -;code = 45
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
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 = m;code = 109
char = y;code = 121
char = e;code = 101
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = u;code = 117
char = k;code = 107
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = (;code = 40
char = K;code = 75
char = 5;code = 53
char = 6;code = 54
char = 2;code = 50
char = /;code = 47
char = D;code = 68
char = O;code = 79
char = X;code = 88
char = );code = 41
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 = Reversal of P-glycoprotein-mediated multidrug resistance by guggulsterone in doxorubicin-resistant human myelogenous leukemia (K562/DOX) cells.
Reversal of P-glycoprotein-mediated multidrug resistance by guggulsterone in doxorubicin-resistant human myelogenous leukemia (K562/DOX) cells.
char = M;code = 77
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char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
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char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = M;code = 77
char = D;code = 68
char = R;code = 82
char = );code = 41
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
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char = b;code = 98
char = e;code = 101
char = e;code = 101
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char = ;code = 32
char = a;code = 97
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = j;code = 106
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char = ;code = 32
char = p;code = 112
char = r;code = 114
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char = b;code = 98
char = l;code = 108
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char = m;code = 109
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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
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char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
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char = h;code = 104
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char = a;code = 97
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char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = d;code = 100
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char = v;code = 118
char = e;code = 101
char = l;code = 108
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char = p;code = 112
char = m;code = 109
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char = n;code = 110
char = t;code = 116
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = P;code = 80
char = -;code = 45
char = g;code = 103
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char = y;code = 121
char = c;code = 99
char = o;code = 111
char = p;code = 112
char = r;code = 114
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char = t;code = 116
char = e;code = 101
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char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = i;code = 105
char = b;code = 98
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char = t;code = 116
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char = r;code = 114
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
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char = ;code = 32
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char = e;code = 101
char = f;code = 102
char = f;code = 102
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char = c;code = 99
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char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
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char = s;code = 115
char = e;code = 101
char = ;code = 32
char = m;code = 109
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char = d;code = 100
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char = g;code = 103
char = ;code = 32
char = r;code = 114
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char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
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char = ;code = 32
char = T;code = 84
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char = e;code = 101
char = ;code = 32
char = a;code = 97
char = i;code = 105
char = m;code = 109
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
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char = s;code = 115
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char = ;code = 32
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char = o;code = 111
char = b;code = 98
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char = ;code = 32
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char = f;code = 102
char = e;code = 101
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char = t;code = 116
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
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char = g;code = 103
char = g;code = 103
char = u;code = 117
char = l;code = 108
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char = e;code = 101
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char = g;code = 103
char = u;code = 117
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char = c;code = 99
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char = i;code = 105
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char = o;code = 111
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char = u;code = 117
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = n;code = 110
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char = n;code = 110
char = t;code = 116
char = ;code = 32
char = K;code = 75
char = 5;code = 53
char = 6;code = 54
char = 2;code = 50
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char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
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char = (;code = 40
char = K;code = 75
char = 5;code = 53
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char = 2;code = 50
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char = );code = 41
char = ;code = 32
char = a;code = 97
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char = e;code = 101
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = K;code = 75
char = 5;code = 53
char = 6;code = 54
char = 2;code = 50
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char = c;code = 99
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char = l;code = 108
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char = .;code = 46
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char = I;code = 73
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char = s;code = 115
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char = c;code = 99
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char = o;code = 111
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char = a;code = 97
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char = ;code = 32
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char = f;code = 102
char = e;code = 101
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char = m;code = 109
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char = g;code = 103
char = ;code = 32
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char = e;code = 101
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char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
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char = M;code = 77
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char = T;code = 84
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char = ];code = 93
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char = 5;code = 53
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char = d;code = 100
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result sql = Multidrug resistance (MDR) has been a major problem in cancer chemotherapy. The development of P-glycoprotein inhibitors could be effective to reverse multidrug resistance. The aim of this study was to observe the effects of guggulsterone, the active component of gugulipid, on multidrug resistance in doxorubicin-resistant K562 cells (K562/DOX) and the parental K562 cells. Its cytotoxicity and reversal effects on multidrug resistance were assessed by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay. Apoptosis percentage of cells was obtained from Annexin V/fluorescein isothiocyanate (FITC) and propridium iodide (PI) double staining. The effects of guggulsterone on P-glycoprotein activity were evaluated by measuring rhodamine 123 (Rh123)-associated mean fluorescence intensity and P-glycoprotein expression on the basis of the flow cytometric technology, respectively. The results showed that guggulsterone up to 100 microM had little cytotoxicity against K562/DOX cells. When combined with doxorubicin, it significantly promoted the sensitivity of K562/DOX cells toward doxorubicin through increasing intracellular accumulation of doxorubicin in a dose-dependent manner. Further study demonstrated that the inhibitory effect of guggulsterone on P-glycoprotein activity was the major cause of increased stagnation of doxorubicin inside K562/DOX cells, indicating that guggulsterone may effectively reverse multidrug resistance in K562/DOX cells via inhibiting expression and drug-transport function of P-glycoprotein.

Publication: Pharmazie 2009 Oct ;64(10)::660-5.
Publication Date: 2009 Oct
Study Author(s): Xu, Hong-Bin;Li, Ling;Liu, Guo-Qing;
Institution: Department of Pharmacy, Tenth People's Hospital, Tongji University, Shanghai, China. [email protected]
Shortcut link to this study:
Multidrug resistance (MDR) has been a major problem in cancer chemotherapy. The development of P-glycoprotein inhibitors could be effective to reverse multidrug resistance. The aim of this study was to observe the effects of guggulsterone, the active component of gugulipid, on multidrug resistance in doxorubicin-resistant K562 cells (K562/DOX) and the parental K562 cells. Its cytotoxicity and reversal effects on multidrug resistance were assessed by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay. Apoptosis percentage of cells was obtained from Annexin V/fluorescein isothiocyanate (FITC) and propridium iodide (PI) double staining. The effects of guggulsterone on P-glycoprotein activity were evaluated by measuring rhodamine 123 (Rh123)-associated mean fluorescence intensity and P-glycoprotein expression on the basis of the flow cytometric technology, respectively. The results showed that guggulsterone up to 100 microM had little cytotoxicity against K562/DOX cells. When combined with doxorubicin, it significantly promoted the sensitivity of K562/DOX cells toward doxorubicin through increasing intracellular accumulation of doxorubicin in a dose-dependent manner. Further study demonstrated that the inhibitory effect of guggulsterone on P-glycoprotein activity was the major cause of increased stagnation of doxorubicin inside K562/DOX cells, indicating that guggulsterone may effectively reverse multidrug resistance in K562/DOX cells via inhibiting expression and drug-transport function of P-glycoprotein.
PMID: 19947169

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