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Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells

  • Authors:
    • Bingnan Ren
    • Hongtao Liu
    • Yupeng Yang
    • Yufei Lian
  • View Affiliations / Copyright

    Affiliations: Department of Pharmacy, Hebei General Hospital, Shijiazhuang, Hebei 050053, P.R. China
    Copyright: © Ren et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 584
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    Published online on: June 3, 2021
       https://doi.org/10.3892/ol.2021.12845
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Abstract

The present study aimed to explore the biological characteristics of non‑small cell lung cancer (NSCLC) cells and the mechanism of chemosensitivity through the role of the PI3K/Akt/mTOR signaling pathway mediated by BRAF gene silencing. Following cell transfection and grouping, an MTT assay detected the activity of NSCLC cells, a scratch wound test assessed the migration ability, flow cytometry using PI staining detected the cell cycle phase, TUNEL and flow cytometry through Annexin V‑PI staining assessed the apoptosis, and colony formation was used to detect the sensitivity of lung cancer cells to cisplatin chemotherapy. Furthermore, the relative expression levels of BRAF, PTEN, PI3K, mTOR mRNA were assessed by RT‑qPCR, and the protein expression levels of BRAF, PTEN, PI3K, phosphorylated (p)‑PI3K, Akt, p‑Akt, mTOR, p‑mTOR, cisplatin resistance‑related enzymes ERCC1 and BRCA1, apoptotic proteins Bax and Bcl‑2 were assessed by western blotting. Compared with the control group and NC group, there were differences in decreased BRAF mRNA expression levels in the small interfering (si)BRAF group and siBRAF + IGF‑1 group (both P<0.05). In addition, compared with the control group, the siBRAF, NVP‑BEZ235 and siBRAF + NVP‑BEZ235 groups had significant decreased cell viability at 2‑6 days, decreased migration ability, shortened proportion of S‑phase cells, increased proportion of G1/G0‑phase cells, increased apoptosis rate, decreased number of colony‑forming cells, decreased mRNA expression of PI3K, Akt and mTOR, increased PTEN mRNA expression, decreased protein expression levels of PI3K, p‑PI3K, Akt, p‑Akt, mTOR, p‑mTOR, ERCC1, BRCA1 and Bcl‑2, and increased protein expression levels of PTEN and Bax (all P<0.05); and more obvious trends were revealed in the siBRAF + NVP‑BEZ235 group (all P<0.05); whereas opposite results were detected in the siBRAF + IGF‑1 group when compared with the siBRAF group and NVP‑BEZ235 group (all P<0.05). Silencing of BRAF gene expression to inhibit the activation of the PI3K/Akt/mTOR signaling pathway exerted a synergistic effect decreasing cell viability, inhibiting the cell cycle and migration, increasing the apoptosis rate, decreasing the number of colony‑forming cells and increasing chemosensitivity of NSCLC. Activation of the PI3K/Akt/mTOR signaling pathway may reverse the role of silencing of BRAF gene expression, providing a potential approach for improving the chemosensitivity of NSCLC. The present study for the first time, to the best of our knowledge, clarified the possible mechanism of NSCLC cell biological characteristic changes and chemosensitivity from the perspective of BRAF gene silencing and PI3K/Akt/mTOR signaling pathway activation, providing a potential reference for suppressing tumor aggravation and improving the therapeutic outcomes of NSCLC at the genetic level.
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Copy and paste a formatted citation
Spandidos Publications style
Ren B, Liu H, Yang Y and Lian Y: Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells. Oncol Lett 22: 584, 2021.
APA
Ren, B., Liu, H., Yang, Y., & Lian, Y. (2021). Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells. Oncology Letters, 22, 584. https://doi.org/10.3892/ol.2021.12845
MLA
Ren, B., Liu, H., Yang, Y., Lian, Y."Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells". Oncology Letters 22.2 (2021): 584.
Chicago
Ren, B., Liu, H., Yang, Y., Lian, Y."Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells". Oncology Letters 22, no. 2 (2021): 584. https://doi.org/10.3892/ol.2021.12845
Copy and paste a formatted citation
x
Spandidos Publications style
Ren B, Liu H, Yang Y and Lian Y: Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells. Oncol Lett 22: 584, 2021.
APA
Ren, B., Liu, H., Yang, Y., & Lian, Y. (2021). Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells. Oncology Letters, 22, 584. https://doi.org/10.3892/ol.2021.12845
MLA
Ren, B., Liu, H., Yang, Y., Lian, Y."Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells". Oncology Letters 22.2 (2021): 584.
Chicago
Ren, B., Liu, H., Yang, Y., Lian, Y."Effect of BRAF‑mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells". Oncology Letters 22, no. 2 (2021): 584. https://doi.org/10.3892/ol.2021.12845
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