Antiproliferative and apoptotic effects of iron chelators on human cervical carcinoma cells

Gynecologic Oncology
Thierry SimonartRobert Snoeck

Abstract

Cervical carcinoma is a human papillomavirus (HPV)-associated cancer for which treatment options still mainly rely on surgical procedures, with or without adjuvant radiotherapy and chemotherapy. As iron may participate in the pathogenesis of viral infections and cancer in several ways, the present study was designed to investigate the effect of iron chelation on HPV-16- and HPV-18-positive cervical carcinoma cell lines. Desferrioxamine and deferiprone, two chemically unrelated iron chelators, were used to investigate the effect of iron chelation on SiHa and HeLa cells. Proliferation was investigated by cells counts, by [(3)H]thymidine uptake assay, and by immunostaining with Ki-67 and proliferating cell nuclear antigen (PCNA). Apoptosis was determined by morphological analysis, by a TUNEL assay, and by flow cytometry detecting FITC-conjugated annexin-V. Desferrioxamine and deferiprone induced a time- and dose-dependent inhibition of SiHa and HeLa cell growth. The inhibition of cell growth was associated with a decrease in the expression of both stable and total PCNA and Ki-67, a proliferation marker whose expression may predict survival in uterine cervical carcinoma. TUNEL assay, flow cytometry with annexin-V-fluorescein, and m...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis