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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board Member: Buchner, Johannes / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred

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Mid-region parathyroid hormone-related protein (PTHrP) and gene expression of MDA-MB231 breast cancer cells

Rosalia Sirchia1 / Claudio Luparello2

1Dipartimento di Biologia Cellulare e dello Sviluppo, Università di Palermo, I-90128 Palermo, Italy

2Dipartimento di Biologia Cellulare e dello Sviluppo, Università di Palermo, I-90128 Palermo, Italy

Corresponding author

Citation Information: Biological Chemistry. Volume 388, Issue 5, Pages 457–465, ISSN (Online) 14316730, ISSN (Print) 14374315, DOI: 10.1515/BC.2007.059, May 2007

Publication History

Published Online:


We have previously shown that PTHrP(38–94) amide restrains growth and invasion in vitro, causes striking toxicity and accelerates death of some breast cancer cell lines, the most responsive being MDA-MB231, for which tumorigenesis was also attenuated in vivo. We have also demonstrated that mid-region PTHrP gains access to the nuclear compartment of these cells and displays DNA-binding properties in vitro by recognizing targets in both cellular chromatin and isolated oligonucleotides. Here, we examined whether PTHrP(38–94) amide was able to modulate gene expression of MDA-MB231 cells, employing a combination of conventional, differential display and semi-quantitative multiplex PCR techniques. The results obtained provide first evidence that PTHrP(38–94) amide can affect gene expression in tumor cells, identifying A4-differentiation protein/PLP2 as up-regulated, and HOX7/MSX1, COX6C, FZD6, OXR1 and TMCO4 as down-regulated genes in treated cells, and suggest that the cytotoxic activity of the peptide can be ascribed, at least in part, to such transcriptional reprogramming.

Keywords: breast cancer; differential display; gene expression; PCR; PTHrP

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