Background Arsenic trioxide (As2O3) has been identified as a very potent antiacute leukemic agent However its role in apoptosis needs to be elucidated As2O3 interferes with the proliferation and survival...Background Arsenic trioxide (As2O3) has been identified as a very potent antiacute leukemic agent However its role in apoptosis needs to be elucidated As2O3 interferes with the proliferation and survival of tumor cells via a variety of mechanisms Drugtarget interactions at the level of nuclear matrix (NM) may be critical events in the induction of cell death by As2O3 This study dealt with As2O3-target interactions at the level of NM in chronic myelogenous leukemia cell line K562 by proteomics Methods K562 cells were cultured in MEM and treated with different concentrations of As2O3 The nuclear matrix proteins were analyzed by highresolution twodimensional gel electrophoresis and computerassisted image analysis Results As2O3 significantly inhibited the growth of chronic myelogenous leukemia cell line K562 at low concentrations While more than 200 protein spots were shared among the nuclear matrices, about 18 distinct spots in the nuclear matrices were found characteristic for As2O3 treated cells Conclusions: As2O3 induces apoptosis in K562 cells in a dose and timedependent manner Our results demonstrated that for the detection of the onset of apoptosis, the alteration in the composition of nuclear matrix proteins was a more sensitive indicator than nucleosomal DNA fragmentation test These results indicated that As2O3 might be clinically useful in the treatment of chronic myelogenous leukemia. The changes of nuclear matrix proteins in the treated cells can be used as a useful indicator for this展开更多
文摘Background Arsenic trioxide (As2O3) has been identified as a very potent antiacute leukemic agent However its role in apoptosis needs to be elucidated As2O3 interferes with the proliferation and survival of tumor cells via a variety of mechanisms Drugtarget interactions at the level of nuclear matrix (NM) may be critical events in the induction of cell death by As2O3 This study dealt with As2O3-target interactions at the level of NM in chronic myelogenous leukemia cell line K562 by proteomics Methods K562 cells were cultured in MEM and treated with different concentrations of As2O3 The nuclear matrix proteins were analyzed by highresolution twodimensional gel electrophoresis and computerassisted image analysis Results As2O3 significantly inhibited the growth of chronic myelogenous leukemia cell line K562 at low concentrations While more than 200 protein spots were shared among the nuclear matrices, about 18 distinct spots in the nuclear matrices were found characteristic for As2O3 treated cells Conclusions: As2O3 induces apoptosis in K562 cells in a dose and timedependent manner Our results demonstrated that for the detection of the onset of apoptosis, the alteration in the composition of nuclear matrix proteins was a more sensitive indicator than nucleosomal DNA fragmentation test These results indicated that As2O3 might be clinically useful in the treatment of chronic myelogenous leukemia. The changes of nuclear matrix proteins in the treated cells can be used as a useful indicator for this
