Volume 18, Issue 4 (Sep-Oct 2010)
JSSU 2010, 18(4): 369-379 |
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Hosseinpour Feizi M, Moosavi M, Ahmadi A, Movafeghi A. Effects of Adenosine 5َ-Triphosphate on Apoptosis and Gene Expression of Survivin Splice Variants in K562 Cells. JSSU 2010; 18 (4) :369-379
URL: http://jssu.ssu.ac.ir/article-1-1148-en.html
URL: http://jssu.ssu.ac.ir/article-1-1148-en.html
Abstract: (11352 Views)
Introduction: Leukemia is a heterogeneous malignant disease in which progression at the level of CD34+ cells has a major impact in drug resistance and relapse. The multi-drug resistance gene product, P-glycoprotein is an inhibitor of apoptosis proteins (IAPs), such as Survivin that are expressed simultaneously with several putative drug resistance parameters in CD34+ leukemia cells. In fact, IAPs over-expression and their anti-apoptotic splice variants are associated with CD34 positivity, poor response to chemotherapy and reduced overall survival in leukemic patients. Recently, adenosine 5ʹ-triphosphate (ATP) has been reported to inhibit proliferation and induce apoptosis in several human cell lines. The K562 CD34+ human myeloid leukemia cell line has the unique feature of expressing significant functional IAPs and other drug-resistance genes. Thus, the efficacy of ATP in overcoming the resistance and expression profile of Survivin and its splice variants were examined in K562 cells in the present study.
Methods: K562 cell were cultured and treated several times with different concentrations of ATP. Apoptosis was studied by fluorescent microscopy(Ao/EtBr double staining) and DNA fragmentation assay. The expression level of Survivin and its splice variants was studied by semiquantative RT-PCR method.
Results: The results showed that over-expression of Survivin and its anti-apoptotic splice variant, 3b splice variant were decreased after treatment by ATP in a time- and dose-dependent manner. The expression levels of other splice variants (ΔEx3, 2b, 2α and 3α) did not show significant difference between the control and the treated cells.
Conclusion: The results showed that ATP attenuated expression of Survivin and its anti-apoptotic splice variant, meaning that this nucleotide can facilitate apoptosis in drug-resistant leukemia cells. In addition, combination of ATP with standard chemotherapies may be utilized for inhibition of drug-resistance in leukemia cells.
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