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PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells

  • Authors:
    • Nan Wu
    • Tetsuya Kurosu
    • Gaku Oshikawa
    • Toshikage Nagao
    • Osamu Miura
  • View Affiliations / Copyright

    Affiliations: Department of Hematology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyoku, Tokyo 113-8519, Japan
    Copyright: © Wu et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].
  • Pages: 419-428
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    Published online on: December 6, 2012
       https://doi.org/10.3892/ijo.2012.1729
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Abstract

PECAM-1 (CD31) is an immunoreceptor tyrosine-based inhibitory motif (ITIM)-containing surface glycoprotein expressed on various hematopoietic cells as well as on endothelial cells. PECAM-1 has been shown to play roles in regulation of adhesion, migration and apoptosis. The BCR/ABL fusion tyrosine kinase is expressed in chronic myeloid leukemia and Philadelphia-positive (Ph+) acute lymphoblastic leukemia cells, and its inhibition by the clinically used tyrosine kinase inhibitors imatinib or dasatinib induces apoptosis of these cells. In the present study, we demonstrate that PECAM-1 is tyrosine phospho­rylated in its ITIM motifs in various BCR/ABL-expressing cells including primary leukemia cells. Studies using imatinib and dasatinib as well as transient expression experiments in 293T cells revealed that PECAM-1 was phosphorylated directly by BCR/ABL, which was enhanced by the imatinib-resistant E255K and T315I mutations, or partly by the Src family tyrosine kinases, including Lyn, which were activated dependently or independently on BCR/ABL. We also demonstrate by using a substrate trapping mutant of SHP2 that tyrosine phosphorylated PECAM-1 binds SHP2 and is a major substrate for this tyrosine phosphatase in BCR/ABL-expressing cells. Overexpression of PECAM-1 in BCR/ABL-expressing cells, including K562 human leukemia cells, enhanced cell adhesion and partially inhibited imatinib-induced apoptosis involving mitochondria depolarization and caspase-3 cleavage, at least partly, in an ITIM-independent manner. These data suggest that PECAM-1 may play a role in regulation of apoptosis as well as adhesion of BCR/ABL-expressing cells to modulate their imatinib sensitivity and would be a possible candidate for therapeutic target in Ph+ leukemias.
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Copy and paste a formatted citation
Spandidos Publications style
Wu N, Kurosu T, Oshikawa G, Nagao T and Miura O: PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells. Int J Oncol 42: 419-428, 2013.
APA
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., & Miura, O. (2013). PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells. International Journal of Oncology, 42, 419-428. https://doi.org/10.3892/ijo.2012.1729
MLA
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., Miura, O."PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells". International Journal of Oncology 42.2 (2013): 419-428.
Chicago
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., Miura, O."PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells". International Journal of Oncology 42, no. 2 (2013): 419-428. https://doi.org/10.3892/ijo.2012.1729
Copy and paste a formatted citation
x
Spandidos Publications style
Wu N, Kurosu T, Oshikawa G, Nagao T and Miura O: PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells. Int J Oncol 42: 419-428, 2013.
APA
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., & Miura, O. (2013). PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells. International Journal of Oncology, 42, 419-428. https://doi.org/10.3892/ijo.2012.1729
MLA
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., Miura, O."PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells". International Journal of Oncology 42.2 (2013): 419-428.
Chicago
Wu, N., Kurosu, T., Oshikawa, G., Nagao, T., Miura, O."PECAM-1 is involved in BCR/ABL signaling and may downregulate imatinib-induced apoptosis of Philadelphia chromosome-positive leukemia cells". International Journal of Oncology 42, no. 2 (2013): 419-428. https://doi.org/10.3892/ijo.2012.1729
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