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Article

Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells

  • Authors:
    • Shan Lu
    • Zhongyun Dong
  • View Affiliations / Copyright

    Affiliations: Department of Medicine, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
  • Pages: 2113-2122
    |
    Published online on: April 19, 2017
       https://doi.org/10.3892/ijo.2017.3964
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Abstract

Resistance to conventional chemotherapies remains a significant clinical challenge in treatment of cancer. The cancer stem cells (CSCs) have properties necessary for tumor initiation, resistance to therapy, and progression. HER/ERBB‑elicited signaling supports CSC properties. Our previous studies revealed that secretory phospholipase A2 group IIa (sPLA2‑IIa) is overexpressed in both prostate and lung cancer cells, leading to an aberrant high level in the interstitial fluid, i.e., tumor microenvironment and blood. HER/ERBB-PI3K-Akt-NF-κB signaling stimulates sPLA2‑IIa overexpression, and in turn, sPLA2‑IIa activates EGFR family receptors and HER/ERBB-elicited signaling and stimulates sPLA2‑IIa overexpression in a positive feedback manner. The present study determined the molecular mechanisms of sPLA2‑IIa in stimulating HER/ERBB-elicited signaling and supporting CSC properties. We found that sPLA2‑IIa binds both EGFR and HER3 demonstrated by co-immunoprecipitation experiments and also indirectly interacts with HER2, suggesting that sPLA2‑IIa functions as a ligand for both EGFR and HER3. Furthermore, both side population CSCs from non-small cell lung cancer (NSCLC) A549 and H1975 cells and ALDH1‑high CSCs from castration-resistant prostate cancer (CRPC) 22Rv1 cells overexpress sPLA2‑IIa and produce tumors when inoculated into subcutis of nude mice. Given an aberrant high level of sPLA2‑IIa in the tumor microenvironment that should be much higher than that in the blood, our findings support the notion that sPLA2‑IIa functions as a ligand for EGFR family receptors and supports CSC properties via HER/ERBB-elicited signaling, which may contribute to resistance to therapy and cancer progression.
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Copy and paste a formatted citation
Spandidos Publications style
Lu S and Dong Z: Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells. Int J Oncol 50: 2113-2122, 2017.
APA
Lu, S., & Dong, Z. (2017). Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells. International Journal of Oncology, 50, 2113-2122. https://doi.org/10.3892/ijo.2017.3964
MLA
Lu, S., Dong, Z."Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells". International Journal of Oncology 50.6 (2017): 2113-2122.
Chicago
Lu, S., Dong, Z."Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells". International Journal of Oncology 50, no. 6 (2017): 2113-2122. https://doi.org/10.3892/ijo.2017.3964
Copy and paste a formatted citation
x
Spandidos Publications style
Lu S and Dong Z: Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells. Int J Oncol 50: 2113-2122, 2017.
APA
Lu, S., & Dong, Z. (2017). Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells. International Journal of Oncology, 50, 2113-2122. https://doi.org/10.3892/ijo.2017.3964
MLA
Lu, S., Dong, Z."Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells". International Journal of Oncology 50.6 (2017): 2113-2122.
Chicago
Lu, S., Dong, Z."Overexpression of secretory phospholipase A2-IIa supports cancer stem cell phenotype via HER/ERBB-elicited signaling in lung and prostate cancer cells". International Journal of Oncology 50, no. 6 (2017): 2113-2122. https://doi.org/10.3892/ijo.2017.3964
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