Preliminary study on the molecular mechanism of K562 cell apoptosis induced by As2S2 / 中华肿瘤杂志
Chinese Journal of Oncology
;
(12): 220-224, 2003.
Article
in Chinese
| WPRIM
| ID: wpr-347457
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the apoptotic inducing effect of As(2)S(2) on K562 cells.</p><p><b>METHODS</b>The apoptotic inducing effect of As(2)S(2) on K562 cells was determined by flow cytometry, DNA fragmentation analysis and morphology observation. Expression of protein was determined by Western-blot. RT-PCR was used to evaluate changes in gene expression.</p><p><b>RESULTS</b>Apoptosis of K562 cells was induced by 48 - 72 h exposure to 5 micromol/L As(2)S(2). Apoptosis was induced in (34.4 +/- 3.3)% treated cells by 72 h exposure to 3 micro mol/L As(2)S(2), in (21.8 +/- 3.6)% treated cells by 48 h exposure to 5 micromol/L As(2)S(2) and in (46.0 +/- 5.2)% treated cells by 72 h exposure to As(2)S(2) at the same concentration. With 5 micromol/L As(2)S(2), the protein level of Bcr-Abl and JAK2 decreased, while bax expression was upregulated and c-myc was downregulated both in protein and mRNA level. The activity of caspase 3 in K562 cells was increased by As(2)S(2). As(2)S(2) also induced apoptosis of fresh mononuclear cells derived from chronic myelogenous leukemia (CML) patients.</p><p><b>CONCLUSION</b>As(2)S(2) can induce apoptosis of CML cells. The decline of Bcr-Abl may play an important role. The upregulation of bax, increase of the activity of caspase 3, downregulation of c-myc and decrease of JAK2 may also be involved in the mechanism.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pathology
/
Pharmacology
/
Arsenicals
/
Sulfides
/
Leukemia, Myelogenous, Chronic, BCR-ABL Positive
/
Fusion Proteins, bcr-abl
/
Apoptosis
/
K562 Cells
/
Drug Therapy
/
Bcl-2-Associated X Protein
Limits:
Humans
Language:
Chinese
Journal:
Chinese Journal of Oncology
Year:
2003
Type:
Article
Similar
MEDLINE
...
LILACS
LIS