title: A survivin-associated adaptive response in radiation therapy.
abstract: Adaptive responses can be induced in cells by very low doses of ionizing radiation resulting in an enhanced resistance to much larger exposures. The inhibitor of apoptosis protein, survivin, has been implicated in many adaptive responses to cellular stress. Computerized axial tomography used in image-guided radiotherapy to position and monitor tumor response uses very low radiation doses ranging from 0.5 to 100 mGy. We investigated the ability of these very low radiation doses administered along with two 2 Gy doses separated by 24 hours, a standard conventional radiotherapy dosing schedule, to initiate adaptive responses resulting in the elevation of radiation resistance in exposed cells. Human colon carcinoma (RKO36), mouse sarcoma (SA-NH), along with transformed mouse embryo fibroblasts, wild type or cells lacking functional tumor necrosis factor receptors 1 and 2 were used to assess their relative ability to express an adaptive response when grown either to confluence in vitro or as tumors in the flank of C57BL/6 mice. The survival of each of these cells was elevated from 5% to 20% (P ≤ 0.05) as compared to cells not receiving a 100 mGy or lesser dose. In addition, the cells exposed to 100 mGy exhibited elevations in survivin levels, reductions in apoptosis frequencies, and loss of an adaptive response if transfected with survivin siRNA. This survivin-mediated adaptive response has the potential for affecting outcomes if regularly induced throughout a course of image guided radiation therapy.
authors: Department of Radiation and Cellular Oncology, The University of Chicago, Chicago, IL 60637, USA. dgrdina@uchicago.edu
authors: David J
authors: DJ
authors: Grdina
authors: Jeffrey S
authors: JS
authors: Murley
authors: Richard C
authors: RC
authors: Miller
authors: Helena J
authors: HJ
authors: Mauceri
authors: Harold G
authors: HG
authors: Sutton
authors: Jian Jian
authors: JJ
authors: Li
authors: Gayle E
authors: GE
authors: Woloschak
authors: Ralph R
authors: RR
authors: Weichselbaum
mesh_terms: D000222:Adaptation, Physiological / Q000528:radiation effects; D000818:Animals; D017209:Apoptosis / Q000528:radiation effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000528:radiation effects; D003110:Colonic Neoplasms / Q000378:metabolism* / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D011247:Pregnancy; D011829:Radiation Dosage; D011836:Radiation Tolerance; D061089:Radiotherapy, Image-Guided / Q000379:methods; D012097:Repressor Proteins / Q000378:metabolism*; D012509:Sarcoma / Q000378:metabolism* / Q000532:radiotherapy*; D000077022:Survivin; D023041:Xenograft Model Antitumor Assays
chemical_list: C107489:BIRC5 protein, human; C117749:Birc5 protein, mouse; D051034:Inhibitor of Apoptosis Proteins; D012097:Repressor Proteins; D000077022:Survivin
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