Abstract
The BCR/ABL tyrosine kinase inhibitor imatinib is highly effective for treatment of chronic myeloid leukemia (CML) and Philadelphia-chromosome positive (Ph+) acute lymphoblastic leukemia (ALL). However, relapses with emerging imatinib-resistance mutations in the BCR/ABL kinase domain pose a significant problem. Here, we demonstrate that nutlin-3, an inhibitor of Mdm2, inhibits proliferation and induces apoptosis more effectively in BCR/ABL-driven Ton.B210 cells than in those driven by IL-3. Moreover, nutlin-3 drastically enhanced imatinib-induced apoptosis in a p53-dependent manner in various BCR/ABL-expressing cells, which included primary leukemic cells from patients with CML blast crisis or Ph+ ALL and cells expressing the imatinib-resistant E255K BCR/ABL mutant. Nutlin-3 and imatinib synergistically induced Bax activation, mitochondrial membrane depolarization, and caspase-3 cleavage leading to caspase-dependent apoptosis, which was inhibited by overexpression of Bcl-XL. Imatinib did not significantly affect the nutlin-3-induced expression of p53 but abrogated that of p21. Furthermore, activation of Bax as well as caspase-3 induced by combined treatment with imatinib and nutlin-3 was observed preferentially in cells expressing p21 at reduced levels. The present study indicates that combined treatment with nutlin-3 and imatinib activates p53 without inducing p21 and synergistically activates Bax-mediated intrinsic mitochondrial pathway to induce apoptosis in BCR/ABL-expressing cells.
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Acknowledgments
We thank Dr. Masashi Aonuma for valuable suggestions. We thank Drs. George Q. Dailey, Robert Weinberg, Bert Vogelstein, Toshio Kitamura, and Shuji Tohda for the generous gifts of experimental materials. This study was supported in part by grants from Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Kurosu, T., Wu, N., Oshikawa, G. et al. Enhancement of imatinib-induced apoptosis of BCR/ABL-expressing cells by nutlin-3 through synergistic activation of the mitochondrial apoptotic pathway. Apoptosis 15, 608–620 (2010). https://doi.org/10.1007/s10495-010-0457-0
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DOI: https://doi.org/10.1007/s10495-010-0457-0