Kallikrein-related peptidases 4, 5, 6 and 7 regulate tumour-associated factors in serous ovarian cancer

Ping Wang, Viktor Magdolen, Christof Seidl, Julia Dorn, Enken Drecoll, Matthias Kotzsch, Feng Yang, Manfred Schmitt, Oliver Schilling, Anja Rockstroh, Judith Ann Clements, Daniela Loessner

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10 Citations (Scopus)

Abstract

Background: Tissue kallikrein-related peptidases 4, 5, 6 and 7 (KLK4–7) strongly increase the malignancy of ovarian cancer cells. Deciphering their downstream effectors, we aimed at finding new potential prognostic biomarkers and treatment targets for ovarian cancer patients. KLK4–7-transfected (OV-KLK4–7) and vector-control OV-MZ-6 (OV-VC) ovarian cancer cells were established to select differentially regulated factors. Methods: With three independent approaches, PCR arrays, genome-wide microarray and proteome analyses, we identified 10 candidates (MSN, KRT19, COL5A2, COL1A2, BMP5, F10, KRT7, JUNB, BMP4, MMP1). To determine differential protein expression, we performed western blot analyses, immunofluorescence and immunohistochemistry for four candidates (MSN, KRT19, KRT7, JUNB) in cells, tumour xenograft and patient-derived tissues. Results: We demonstrated that KLK4–7 clearly regulates expression of MSN, KRT19, KRT7 and JUNB at the mRNA and protein levels in ovarian cancer cells and tissues. Protein expression of the top-upregulated effectors, MSN and KRT19, was investigated by immunohistochemistry in patients afflicted with serous ovarian cancer and related to KLK4–7 immunoexpression. Significant positive associations were found for KRT19/KLK4, KRT19/KLK5 and MSN/KLK7. Conclusion: These findings imply that KLK4–7 exert key modulatory effects on other cancer-related genes and proteins in ovarian cancer. These downstream effectors of KLK4–7, MSN and KRT19 may represent important therapeutic targets in serous ovarian cancer.

Original languageEnglish
Pages (from-to)823-831
Number of pages9
JournalBritish Journal of Cancer
Volume119
Issue number7
DOIs
Publication statusPublished - 5 Oct 2018
Externally publishedYes

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