Summary
In spite of numerous advances, the 5-year survival rate for head and neck squamous cell cancer has remained largely stagnant and few new anti-tumor drugs have been developed. PCH4, a derivative of n-butylidenephthalide, has been investigated for its anti-tumor effects on oral squamous cell carcinoma (OSCC). The aim of this study was to investigate the anti-tumor mechanism of a potential target gene, Nur77, in OSCC cells, which can be induced by PCH4 treatment. Data show that PCH4 promoted Nur77 translocation from the nucleus to the cytoplasm and induced cell apoptosis in OSCC cells. When Nur77 translocation was blocked, the degree of tumor apoptosis caused by PCH4 was significantly inhibited (p < 0.05). Within the MAPK pathway, PCH4 only induced JNK phosphorylation. Furthermore, treatment with a JNK inhibitor significantly reduced PCH4-induced apoptosis (p < 0.05) and decreased PCH4-induced Nur77 expression (p < 0.05). In a xenograft animal model, administration of PCH4 also showed anti-tumor effects. We have demonstrated that OSCC cells are sensitive to PCH4 and that Nur77 protein translocation from the nucleus to the cytoplasm might be associated with the induction of apoptosis by PCH4. These results indicate that PCH4 may serve as a potential anti-tumor drug for OSCC therapy.
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Abbreviations
- OSCC:
-
Oral squamous cell carcinoma
- PCH4:
-
(Z)-N-(2-(dimethyl-amino) ethyl)-2-(3-((3-oxo-isobenzofuran- 1(3H)-ylidene) methyl) phenoxy) acetamide)
- BP:
-
butylidenephthalide
- RT-PCR:
-
reverse transcription-polymerase chain reaction
- DMSO:
-
dimethyl sulfoxide
- PCR:
-
polymerase chain reaction
- siRNA:
-
small interfering RNA
- MTT:
-
3-(4,5-dimethyl thizol-2-yl)-2,5-diphenyl tetrazolium bromide
- PVDF:
-
polyvinyldenefluoride
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Acknowledgements
This work was supported by a Grant from National Science Council of the Republic of China (96-2320-B-039-044-MY3) and China Medical University Hospital of the Republic of China (DMR-99-073).
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The authors declare that there are no conflicts of interest.
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The last two corresponding authors (Tzyy Wen Chiou and Horng Jyh Harn) contributed equally to this work.
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Liu, P.Y., Sheu, J.JC., Lin, P.C. et al. Expression of Nur77 induced by an n-butylidenephthalide derivative promotes apoptosis and inhibits cell growth in oral squamous cell carcinoma. Invest New Drugs 30, 79–89 (2012). https://doi.org/10.1007/s10637-010-9518-z
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DOI: https://doi.org/10.1007/s10637-010-9518-z