Abstract
Differential gene expression of cell lines derived from a malignant melanoma or its autologous lymph node metastasis using cDNA arrays indicated down-regulation of PRSS11, a gene encoding the serine protease HtrA1, a homolog of the Escherichia coli protease HtrA, in the metastatic line. Stable PRSS11 overexpression in the metastatic cell line strongly inhibited proliferation, chemoinvasion and Nm23-H1 protein expression in vitro, as well as cell growth in vivo in nu/nu mice. A polyclonal anti-HtrA1 serum demonstrated a significantly higher expression in primary melanomas when compared to unrelated metastatic lesions in a human melanoma tissue array, and down-modulation of HtrA1 expression in autologous lymph node melanoma metastases in seven out of 11 cases examined. These results suggest that down-regulation of PRSS11 and HtrA1 expression may represent an indicator of melanoma progression.
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Acknowledgements
We thank C Leonetti (Regina Elena Institute, Rome, Italy) for providing the LP and LM cell lines, IJ Fidler (MD Anderson Cancer Center, Houston, TX, USA) for the A375P and A375M cell lines, B Trueb (University of Bern, Switzerland) for providing the PRSS11 cDNA, and B Vincenzi (Campus BioMedico University, Rome, Italy) and A Abbate (Catholic University, Rome, Italy) for the statistical analysis. A Baldi is the recipient of a FIRC fellowship. This work was supported in part by AIRC grants to MG Paggi, DM Noonan, A Albini, A Felsani and PG Natali, by FIRC to A De Luca, by Ministero della Sanità to MG Paggi, DM Noonan, A Felsani and D Lombardi, from General Broker Service, Roche and Sanofi Synthelabo grants to A Baldi. We thank AOAR for the continuous support and encouragement.
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Baldi, A., Luca, A., Morini, M. et al. The HtrA1 serine protease is down-regulated during human melanoma progression and represses growth of metastatic melanoma cells. Oncogene 21, 6684–6688 (2002). https://doi.org/10.1038/sj.onc.1205911
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DOI: https://doi.org/10.1038/sj.onc.1205911
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