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Ionizing radiation enhances adenoviral vector expressing mda-7/IL-24-mediated apoptosis in human ovarian cancer Emdad L; Sarkar D; Lebedeva IV; Su ZZ; Gupta P; Mahasreshti PJ; Dent P; Curiel DT; Fisher PBJ Cell Physiol 2006[Aug]; 208 (2): 298-306Ovarian cancer is the fifth most common cause of cancer-related death in women. Current interventional approaches, including debulking surgery, chemotherapy, and/or radiation have proven minimally effective in preventing the recurrence and/or mortality associated with this malignancy. Subtraction hybridization applied to terminally differentiating human melanoma cells identified melanoma differentiation associated gene-7/interleukin-24 (mda-7/IL-24), whose unique properties include the ability to selectively induce growth suppression, apoptosis, and radiosensitization in diverse cancer cells, without causing any harmful effects in normal cells. Previously, it has been shown that adenovirus-mediated mda-7/IL-24 therapy (Ad.mda-7) induces apoptosis in ovarian cancer cells, however, the apoptosis induction was relatively low. We now document that apoptosis can be enhanced by treating ovarian cancer cells with ionizing radiation (IR) in combination with Ad.mda-7. Additionally, we demonstrate that mda-7/IL-24 gene delivery, under the control of a minimal promoter region of progression elevated gene-3 (PEG-3), which functions selectively in diverse cancer cells with minimal activity in normal cells, displays a selective radiosensitization effect in ovarian cancer cells. The present studies support the use of IR in combination with mda-7/IL-24 as a means of augmenting the therapeutic benefit of this gene in ovarian cancer, particularly in the context of tumors displaying resistance to radiation therapy.|*Apoptosis/genetics/radiation effects[MESH]|*Radiation, Ionizing[MESH]|Adenoviruses, Human/genetics/pathogenicity/physiology[MESH]|Cell Culture Techniques[MESH]|Cell Line, Tumor[MESH]|Cell Survival/radiation effects[MESH]|Combined Modality Therapy[MESH]|Female[MESH]|Genetic Vectors[MESH]|Green Fluorescent Proteins/metabolism[MESH]|Humans[MESH]|Interleukins/*genetics/metabolism[MESH]|Luciferases/metabolism[MESH]|Ovarian Neoplasms/*genetics/metabolism/*therapy/virology[MESH] |
