CD7 promotes extramedullary involvement of the B-cell acute lymphoblastic leukemia line Tanoue by enhancing integrin β2-dependent cell adhesiveness

  • Authors:
    • Takashi Kondoh
    • Kageaki Kuribayashi
    • Maki Tanaka
    • Daisuke Kobayashi
    • Nozomi Yanagihara
    • Naoki Watanabe
  • View Affiliations

  • Published online on: June 11, 2014     https://doi.org/10.3892/ijo.2014.2492
  • Pages: 1073-1081
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Abstract

Extramedullary involvement (EMI) is a factor that defines prognosis of acute lymphoblastic leukemia; however, the molecular mechanism(s) remain elusive. Here, we show that CD7 promotes EMI of the human B-cell acute lymphoblastic leukemia cell line Tanoue. The Tanoue cell line expressing firefly luciferase, Luc-Tanoue, was transplanted into non-obese diabetic/severe combined immunodeficient mice, and cells infiltrated into the brain were cultured ex vivo. This process was repeated 4 times to obtain the highly invasive line Luc-Tanoue-F4. Comparison of the global gene expression signatures of Luc-Tanoue-F4 and Luc-Tanoue indicated that the CD7 gene showed the largest increase in expression among EMI-related genes in Luc-Tanoue-F4 cells. Overexpression of CD7 in Tanoue enhanced cell invasiveness. Among cell migration, proliferation, adhesion and protease activity, only cell adhesiveness showed enhancement in Luc-Tanoue-F4. Expression of the intracellular domain, but not the extracellular domain, of CD7 enhanced cell adhesiveness. Luc-Tanoue-F4 showed a higher level of integrin β2 expression; overexpression of CD7 induced the expression of integrin β2 in Luc-Tanoue. These results show that CD7 induces integrin β2 and enhances cell adhesiveness and invasiveness in Tanoue cells. This study highlights the role of the CD7/integrin β2 axis as a critical pathway in the process of EMI of human B-cell acute lymphoblastic leukemia.
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September-2014
Volume 45 Issue 3

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Kondoh T, Kuribayashi K, Tanaka M, Kobayashi D, Yanagihara N and Watanabe N: CD7 promotes extramedullary involvement of the B-cell acute lymphoblastic leukemia line Tanoue by enhancing integrin β2-dependent cell adhesiveness. Int J Oncol 45: 1073-1081, 2014
APA
Kondoh, T., Kuribayashi, K., Tanaka, M., Kobayashi, D., Yanagihara, N., & Watanabe, N. (2014). CD7 promotes extramedullary involvement of the B-cell acute lymphoblastic leukemia line Tanoue by enhancing integrin β2-dependent cell adhesiveness. International Journal of Oncology, 45, 1073-1081. https://doi.org/10.3892/ijo.2014.2492
MLA
Kondoh, T., Kuribayashi, K., Tanaka, M., Kobayashi, D., Yanagihara, N., Watanabe, N."CD7 promotes extramedullary involvement of the B-cell acute lymphoblastic leukemia line Tanoue by enhancing integrin β2-dependent cell adhesiveness". International Journal of Oncology 45.3 (2014): 1073-1081.
Chicago
Kondoh, T., Kuribayashi, K., Tanaka, M., Kobayashi, D., Yanagihara, N., Watanabe, N."CD7 promotes extramedullary involvement of the B-cell acute lymphoblastic leukemia line Tanoue by enhancing integrin β2-dependent cell adhesiveness". International Journal of Oncology 45, no. 3 (2014): 1073-1081. https://doi.org/10.3892/ijo.2014.2492