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Notarbartolo, M. et al.

Induction of apoptosis by the adenosine derivative IB-MECA in parental or multidrug-resistant HL-60 leukemia cells: possible relationship to the effects on inhibitor of apoptosis protein levels.

BACKGROUND: The effects of the A(3) adenosine receptor (A(3)AR) agonist IB-MECA were examined in HL-60 leukemia and in its multidrug-resistant variant HL-60R cells. METHODS: Cytotoxicity was evaluated by MTS assays and apoptosis by flow cytometry analyses of DNA fragmentation and phosphatidylserine exposure. The mRNAs of A(3)AR and inhibitor of apoptosis proteins (IAPs) were determined by RT-PCR. RESULTS: A(3)AR expression was similar in HL-60 and HL-60R cells. At > or =100 microM, IB-MECA exhibited strong cytotoxic and apoptotic effects in HL-60, but not in HL-60R cells. This activity was not modified by the A(3)AR antagonist VUF5574, the P-glycoprotein inhibitor verapamil, the adenosine uptake inhibitor NBTI or the anti-Fas antibody ZB4. HL-60R cells showed higher levels of different IAPs than HL-60 cells. IB-MECA 100 microM downregulated HIAP1, NAIP and survivin mRNAs in HL-60, but not in HL-60R cells. CONCLUSIONS: The antitumor effects of IB-MECA are not mediated by A(3)AR in HL-60 cells, where the proapoptotic mechanism of the compound may involve downregulation of IAPs. The resistance of HL-60R cells to IB-MECA may depend on their elevated levels of IAPs.[1]

References

Induction of apoptosis by the adenosine derivative IB-MECA in parental or multidrug-resistant HL-60 leukemia cells: possible relationship to the effects on inhibitor of apoptosis protein levels. Notarbartolo, M., Lo Cicero, S., Meli, M., Poma, P., Labbozzetta, M., Cervello, M., D'Alessandro, N. Chemotherapy. (2005) [Pubmed]

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