BRAP2 inhibits the Ras/Raf/MEK and PI3K/Akt pathways in leukemia cells, thereby inducing apoptosis and inhibiting cell growth

  • Authors:
    • Hiroharu Sakai
    • Isamu Shiina
    • Takahisa Shinomiya
    • Yukitoshi Nagahara
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  • Published online on: March 5, 2021     https://doi.org/10.3892/etm.2021.9894
  • Article Number: 463
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Abstract

Breast cancer susceptibility gene 1 (BRCA1)-associated protein 2 (BRAP2) is a novel protein that binds to BRCA1 and is located in the cytoplasm. BRAP2 has been demonstrated to bind to regulators of the Ras‑Raf‑MEK and PI3K/Akt pathways, both of which are involved in carcinogenesis. This suggests that BRAP2 may be capable of regulating both pathways. In the present study, the role of BRAP2 in both pathways was clarified during apoptosis and cell proliferation in a leukemia cell line. A BRAP2‑deficient leukemia cell line was generated using CRISPR/Cas9, the BRAP2‑deficient and parental cells were treated with a Ras, pan‑Raf or PI3K inhibitor, and the changes in signal transduction, apoptosis and cell proliferation were evaluated. BRAP2 knockout attenuated the inhibition of signal transduction of the Ras‑Raf‑MEK and PI3K/Akt pathways by the Ras, pan‑Raf or PI3K inhibitor. BRAP2 deletion also suppressed the cytotoxic and apoptotic effects of the Ras and pan‑Raf inhibitors. However, the loss of BRAP2 did not suppress the cytotoxicity of the PI3K inhibitor but did suppress the PI3K inhibitor‑induced inhibition of cell proliferation. The present results indicated that BRAP2 induces apoptosis and the inhibition of cell proliferation via regulating the Ras‑Raf‑MEK and PI3K/Akt pathways. In leukemia cells, because the Ras‑Raf‑MEK and PI3K/Akt pathways are activated aberrantly, the simultaneous inhibition of both pathways is desired. The current results indicated that enhancement of the function of BRAP2 may represent a new target in leukemia treatment.
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May-2021
Volume 21 Issue 5

Print ISSN: 1792-0981
Online ISSN:1792-1015

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Spandidos Publications style
Sakai H, Shiina I, Shinomiya T and Nagahara Y: BRAP2 inhibits the Ras/Raf/MEK and PI3K/Akt pathways in leukemia cells, thereby inducing apoptosis and inhibiting cell growth. Exp Ther Med 21: 463, 2021.
APA
Sakai, H., Shiina, I., Shinomiya, T., & Nagahara, Y. (2021). BRAP2 inhibits the Ras/Raf/MEK and PI3K/Akt pathways in leukemia cells, thereby inducing apoptosis and inhibiting cell growth. Experimental and Therapeutic Medicine, 21, 463. https://doi.org/10.3892/etm.2021.9894
MLA
Sakai, H., Shiina, I., Shinomiya, T., Nagahara, Y."BRAP2 inhibits the Ras/Raf/MEK and PI3K/Akt pathways in leukemia cells, thereby inducing apoptosis and inhibiting cell growth". Experimental and Therapeutic Medicine 21.5 (2021): 463.
Chicago
Sakai, H., Shiina, I., Shinomiya, T., Nagahara, Y."BRAP2 inhibits the Ras/Raf/MEK and PI3K/Akt pathways in leukemia cells, thereby inducing apoptosis and inhibiting cell growth". Experimental and Therapeutic Medicine 21, no. 5 (2021): 463. https://doi.org/10.3892/etm.2021.9894