Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Toll-like Receptor 5 Agonist Inhibition of Growth of A549 Lung Cancer Cells in Vivo in a Myd88 Dependent Manner

  • Zhou, Shi-Xiang (Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine) ;
  • Li, Feng-Sheng (Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine) ;
  • Qiao, Yu-Lei (Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine) ;
  • Zhang, Xue-Qing (Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine) ;
  • Wang, Zhi-Dong (Department of Radiation Toxicology and Oncology, Beijing Institute of Radiation Medicine)
  • Published : 2012.06.30
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Abstract

The purpose of this study was to examine the effect of a Toll-like receptor 5 (TLR5) agonist, CBLB502, on the growth and radiosensitivity of A549 lung cancer cells in vivo. Expression of myeloid differentiation factor 88 (MyD88) or TLR5 was stably knocked down in human lung cancer cells (A549) using lentivirus expressing short hairpin RNA targeting human MyD88 or TLR5. Lack of MyD88 or TLR5 expression enhanced tumor growth in mouse xenografts of A549 lung cancer cells. CBLB502 inhibited the growth of A549 lung cancer cells, not A549-MyD88-KD cells in vivo in the murine xenograft model. Our results showed that the inhibition of A549 by CBLB502 in vivo was realized through regulating the expression of neutrophil recruiting cytokines and neutrophil infiltration. Finally, we found that activation of TLR5 signaling did not affect the radiosensitivity of tumors in vivo.

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