2015年12月
Cancer cell-derived IL-8 induces monocytic THP1 cells to secrete IL-8 via the mitogen-activated protein kinase pathway
TUMOR BIOLOGY
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- 巻
- 36
- 号
- 12
- 開始ページ
- 9171
- 終了ページ
- 9177
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s13277-015-3641-6
- 出版者・発行元
- SPRINGER
Aberrant activity of transcription factors in oral squamous cell carcinoma (OSCC) results in the spontaneous secretion of various cytokines and chemokines. Among them, IL-8, owing to its angiogenic activity, promotes the growth of OSCCs. In the present study, we examined the role of IL-8 secreted by OSCCs, on the angiogenic activity of monocytic THP1 cells. Culture supernatant (Ca-sup) augmented IL-8 secretion by THP1 cells, which was found to be significantly reduced following the removal Ca9-22-derived IL-8 from the Ca-sup. IL-8 induction was regulated at the transcriptional level, because real-time PCR demonstrated the augmented IL-8 messenger RNA (mRNA) expression. We further performed the luciferase assay using the 5'-untranslated region of IL-8 gene. Contradictory to our speculations, luciferase activity was not augmented by Ca-sup stimulation. NF-kappa B-independent IL-8 induction was further confirmed by pre-treating THP1 cells with NF-kappa B-specific inhibitors. To elucidate the signaling pathway, THP1 was pre-treated with MEK inhibitors. The results demonstrated that pre-treatment of cells with MEK inhibitor drastically reduced IL-8 levels, suggesting the role of MEK. Moreover, Ca-sup was found to increase ERK1/2 phosphorylation in a time-dependent manner. These results indicated that OSCC-derived IL-8 appears to activate angiogenic activity in monocytes within the tumor microenvironment via the mitogen-activated protein kinase (MAPK) pathway.
- リンク情報
- ID情報
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- DOI : 10.1007/s13277-015-3641-6
- ISSN : 1010-4283
- eISSN : 1423-0380
- Web of Science ID : WOS:000367329300008