Abstract:
:Integrins are extracellular matrix receptors involved in tumour invasion and angiogenesis. Although there is evidence that inhibiting integrins might enhance the efficiency of radiotherapy, little is known about the exact mechanisms involved in the integrin-dependent modulation of tumor radiosensitivity. The purpose of this study was to investigate the role of alphavbeta3 and alphavbeta5 integrins in glioblastoma cell radioresistance and overall to decipher the downstream biological pathways. We first demonstrated that silencing alphavbeta3 and alphavbeta5 integrins with specific siRNAs significantly reduced the survival after irradiation of 2 glioblastoma cell lines: U87 and SF763. We then showed that integrin activity and integrin signalling pathways controlled the glioma cell radiosensitivity. This regulation of glioma cell response to ionising radiation was mediated through the integrin-linked kinase, ILK, and the small GTPase, RhoB, by two mechanisms. The first one, independent of ILK, consists in the regulation of the intracellular level of RhoB by alphavbeta3 or alphavbeta5 integrin. The second pathway involved in cell radiosensitivity consists in RhoB activation by ionising radiation through ILK. Furthermore, we demonstrated that the alphavbeta3/alphavbeta5 integrins/ILK/RhoB pathway controlled the glioma cells radiosensitivity by regulating radiation-induced mitotic cell death. This work identifies a new biological pathway controlling glioblastoma cells radioresistance, activated from the membrane through alphavbeta3 and/or alphavbeta5 integrins via ILK and RhoB. Our results are clues that downstream effectors of alphavbeta3 and alphavbeta5 integrins as ILK and RhoB might also be promising candidate targets for improving the efficiency of radiotherapy and thus the clinical outcome of patients with glioblastoma.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Monferran S,Skuli N,Delmas C,Favre G,Bonnet J,Cohen-Jonathan-Moyal E,Toulas Cdoi
10.1002/ijc.23498subject
Has Abstractpub_date
2008-07-15 00:00:00pages
357-364issue
2eissn
0020-7136issn
1097-0215journal_volume
123pub_type
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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doi:10.1002/ijc.28294
更新日期:2013-12-01 00:00:00
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journal_title:International journal of cancer
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更新日期:1997-12-19 00:00:00
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更新日期:1986-06-15 00:00:00
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更新日期:1998-02-20 00:00:00
abstract::The effects on cell survival in tissue culture of Adriamycin, of various Adriamycin derivatives and of the parent compound, daunomycin, have been studied. Adriamycin and three of its C-14 derivatives show similar toxicities towards cells chronically exposed in culture. Acute (30 min) exposures are significantly less t...
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journal_title:International journal of cancer
pub_type: 杂志文章,随机对照试验
doi:10.1002/ijc.21680
更新日期:2006-05-15 00:00:00
abstract::In a series of consecutive 51chromium (51Cr) assays, 21 melanoma and 14 colo-rectal carcinoma patients were tested for their in vitro cell-mediated immune reactions to melanoma, rectal adenocarcinoma, and normal fibroblast target cells. Blood lymphocytes (BL) from four individuals were included in each experiment. In ...
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journal_title:International journal of cancer
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doi:10.1002/ijc.2910510510
更新日期:1992-07-09 00:00:00
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journal_title:International journal of cancer
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更新日期:2020-05-01 00:00:00
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abstract::In a series of 87 primary breast tumors, somatostatin receptor (SSR) expression was detected by in vitro autoradiography in 58 tumors. In 41 tumors the SSR expression was homogeneous and in 17 it was heterogeneous. Although the tumors were not selected by the investigators upon entry in the study, examination of the t...
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abstract::We have analyzed the BRAF locus on chromosome 7q34 with microsatellites for allelic changes and exons 11 and 15 of the BRAF with sequencing for mutations in 50 kidney cancers including 20 papillary, 15 conventional and 15 chromophobe renal cell carcinomas (RCC). Allelic changes at the BRAF locus were seen in 16 of the...
journal_title:International journal of cancer
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abstract::The secretion of antibody by hybridoma cells allows the growth of individual cells to be measured by a hemolytic plaque assay. Similarly, plaque reduction assays were sensitive indicators of tumor immunity. A series of strains of hybridoma have been isolated from an original isolate which is sensitive to cytotoxic T c...
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