Schistosoma Egg Antigen Induces Oncogenic Alterations in Human Prostate Cells
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Date
2018-12
Journal Title
Journal ISSN
Volume Title
Publisher
Analytical cellular pathology (Amsterdam)
Abstract
Schistosomiasis is a neglected tropical disease that affects 200 million people and accounts for 100,000 deaths annually. In endemic
geographical areas, schistosomiasis has been implicated as an etiological agent in the pathogenesis of bladder, colorectal, and renal
carcinoma largely due to Schistosoma eggs in tissues that comes with chronic infection. Several studies have also reported cases of
association between Schistosoma infection and prostate cancer. The possible causal association is however poorly understood. We
hypothesized in this study that infection of the prostate cells with Schistosoma spp promotes cancer. Urine samples from individuals
living in Galilea, a schistosomiasis endemic community in the Ga South District of Ghana, were collected and screened for
Schistosoma infection via microscopy and multiplex PCR. Soluble egg antigens (SEA) were prepared from Schistosoma egg-
positive urine samples and assessed for the ability to induce cancer-like phenotypes including excessive proliferation, oxidative
stress (reduced glutathione (GSH) depletion), and diminished apoptosis in cultured human prostate (PNT2) cells. Molecular
analysis revealed infecting schistosome species to be S.haematobium and S. mansoni. Prostate cell proliferation was significantly
induced by 12.5 μg/ml SEA (p=0029). Also, SEA dose-dependently depleted cellular GSH. Flow cytometric analysis and
fluorescence staining revealed that SEA dose-dependently diminished apoptosis, significantly, in prostate cells. Findings of this
study suggest that schistosome infection may play a role in the pathogenesis of prostate cancer. In vivo studies are however
needed to confirm this association.