Plakophilin 1-deficient cells upregulate SPOCK1: implications for prostate cancer progression
Plakophilin (PKP) 1 is frequently downregulated in prostate cancer and therefore may play a tumor-suppressive role. In the present study, we stably knocked down PKP1 in the non-neoplastic, prostatic BPH-1 cell line. In the PKP1-deficient cells, the expression of keratin 14 was lost, and the apoptosi...
Gespeichert in:
| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
4 July 2015
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| In: |
Tumor biology
Year: 2015, Jahrgang: 36, Heft: 12, Pages: 9567-9577 |
| ISSN: | 1423-0380 |
| DOI: | 10.1007/s13277-015-3628-3 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1007/s13277-015-3628-3 Verlag, Volltext: https://link.springer.com/article/10.1007/s13277-015-3628-3 
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| Verfasserangaben: | Cheng Yang, Regina Fischer-Kešo, Tanja Schlechter, Philipp Ströbel, Alexander Marx, Ilse Hofmann |
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| 245 | 1 | 0 | |a Plakophilin 1-deficient cells upregulate SPOCK1 |b implications for prostate cancer progression |c Cheng Yang, Regina Fischer-Kešo, Tanja Schlechter, Philipp Ströbel, Alexander Marx, Ilse Hofmann |
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| 520 | |a Plakophilin (PKP) 1 is frequently downregulated in prostate cancer and therefore may play a tumor-suppressive role. In the present study, we stably knocked down PKP1 in the non-neoplastic, prostatic BPH-1 cell line. In the PKP1-deficient cells, the expression of keratin 14 was lost, and the apoptosis rate was significantly reduced indicating that the cells acquired new biological capabilities. Moreover, we analyzed the gene expression profile of the PKP1-deficient BPH-1 cells. Among the genes that were significantly altered upon PKP1 knockdown, we noticed several extracellular matrix (ECM)-related genes and identified sparc/osteonectin, cwcv, and kazal-like domains proteoglycan 1 (SPOCK1/testican-1) as a gene of interest. SPOCK1 is a component of the ECM and belongs to a matricellular protein family named secreted protein, acidic, cysteine-rich (SPARC). The role of SPOCK1 in prostate cancer has not been clearly elucidated. We analyzed SPOCK1 mRNA expression levels in different cancer databases and characterized its expression in 136 prostatic adenocarcinomas by immunohistochemistry and western blot. SPOCK1 revealed a cytoplasmic localization in the glandular epithelium of the prostate and showed a significant upregulation of mRNA and protein in prostate tumor samples. Our findings support the hypothesis that PKP1 may have a tumor-suppressive function and suggest an important role of SPOCK1 in prostate tumor progression. Collectively, altered expression of PKP1 and SPOCK1 appears to be a frequent and critical event in prostate cancer. | ||
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