Abstract
Abstract Retinoblastoma (Rb) is a rapidly developing cancer which develops in the cells of the retina, the light detecting tissue of the eye. It is the most common primary ocular malignancy (eye cancer) of childhood. There are both hereditary and sporadic forms of retinoblastoma. The hereditary form of retinoblastoma is associated with a germ line mutation in one of the RB genes and is characterized by the occurrence of multiple, bilateral Rb tumors and a predisposition to the development of second cancers. These second tumors often occur in patients treated by radiation therapy. In the previous study, an unexpected hypersensitivity to ionizing radiation in skin fibroblasts derived from unaffected parents of children with hereditary Rb was observed. By use of the prediction analysis for microarrays (PAM) and principal component analysis (PCA), 42 significantly differential expressed genes were selected and identified as radiosensitive genes. Therefore, one of these 42 genes, IGFBP5 (insulin-like growth factor binding protein 5) was chosen to further investigate the role in radiosensitivity in fibroblast cells. IGFBP5 was overexpressed or knocked down in HS68 (the human foreskin fibroblast) cells. The cells were irradiated with γ -ray, and then counted and seeded into the plates for colony formation assays. According to the results, IGFBP5-ovexpressed cells seemed to be more resistant to radiation. Also, IGFBP5 knocked down cells might be more sensitive to radiation under low dose of radiation. In summary, these results suggested that IGFBP5 may play a role in radiosensitivity in human fibroblast cells. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 1327.
Published Version
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