The alarm anti-protease, secretory leukocyte protease inhibitor, is a proliferation and survival factor for ovarian cancer cells

Fiona A. Simpkins, Nick M. Devoogdt, Nabila Rasool, Nana E. Tchabo, Emilyn U. Alejandro, Mitchell M.R.N. Kamrava, Elise C. Kohn

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Alarm anti-proteases are secreted locally in response to inflammation and have been shown to be elevated in cancers. Secretory leukocyte protease inhibitor (SLPI), an alarm anti-protease, is amplified in ovarian carcinoma and is induced and binds to and protects progranulin (prgn) in inflammation. We reported prgn is a survival protein in ovarian cancer and now hypothesize that SLPI/prgn would promote proliferation and survival. Neutralizing anti-SLPI antibody treatment of HEY-A8 and OVCAR3 ovarian cancer cells decreased cell number (P < 0.001), induced apoptosis and reduced prgn quantity. This was confirmed using SLPI small interfering RNA. Prgn and SLPI were co-immunoprecipitated and co-localized by confocal microscopy. Prgn is a substrate of the serine protease elastase and SLPI is an inhibitor of elastase. Elastase reduced prgn expression, inhibited proliferation in a dose-dependent manner (P ≤ 0.01) and was pro-apoptotic. SLPI protected prgn from elastase-mediated degradation and restored its survival and proliferative function (P ≤ 0.04). SLPI also reversed elastase's pro-apoptotic effects (P ≤ 0.03), yielding recovery of S-phase fraction (P ≤ 0.001) and increased cyclin D1. Treatment with a general serine protease inhibitor increased prgn, but did not reverse elastase-mediated prgn loss or apoptosis. These data demonstrate that inappropriate over-expression of the alarm anti-protease, SLPI, creates a pro-survival milieu for ovarian cancer.

Original languageEnglish (US)
Pages (from-to)466-472
Number of pages7
JournalCarcinogenesis
Volume29
Issue number3
DOIs
StatePublished - Mar 1 2008

    Fingerprint

ASJC Scopus subject areas

  • Cancer Research

Cite this

Simpkins, F. A., Devoogdt, N. M., Rasool, N., Tchabo, N. E., Alejandro, E. U., Kamrava, M. M. R. N., & Kohn, E. C. (2008). The alarm anti-protease, secretory leukocyte protease inhibitor, is a proliferation and survival factor for ovarian cancer cells. Carcinogenesis, 29(3), 466-472. https://doi.org/10.1093/carcin/bgm212