differential response of healthy and tumoral tissu after microbeam radiation therapy
type: Dataset
description: Synchrotron Microbeam Radiation Therapy (MRT) is a novel form of radiosurgery of brain tumors which allows high dose deposition (few hundreds of Gy) in pathologic tissues. The spatial fractionation of the incident beam into arrays of near-parallel microbeams has shown efficiency on brain tumors implanted in rodents while sparing normal tissues. The preferential effects observed on tumor vessels could not entirely explain the efficiency of MRT and other biological mechanisms might be involved in tumor control. In this work, we described the early whole transcriptomic responses of normal and tumoral (9L gliosarcoma) tissues to MRT and the associated biofunctions and pathways. This provides a questionable data base which can be used by the whole MRT community. This base allows to identify transcripts involved in tumor response to MRT and which inhibition would have no consequence in healthy tissue repair. We identified 3 relevant targets which might increase the therapeutic index of MRT. (i) The radio-induced inhibition of a cluster of 13 genes (Plk1, Cdc20, Ccnb1, Pttg1, Bub1, Dlgap5, Cenpf, Kif20a, Traf4af1, Depdc1b, Mxd3, Cenpe and Cenpf) may be involved in tumor control after MRT through the deregulation of cell division and could be amplified to continue the tumor growth inhibition. (ii) We might benefit from the activation of the Clecsf6 promoter in irradiated tumors by delivering, via modified and injected monocytes, some therapeutic proteins. (iii) Finally, Areg (encoding for Amphiregulin) is overexpressed in tumors after MRT and its involvement described in chimio/radioresistance enable to consider that its inhibition might help in tumor control after irradiation. We also showed that MRT induces a greater tumor control and survival rates compared with similar broad beam irradiations but no differences in transcriptomic responses have been highlighted.
landing page: https://theses.hal.science/tel-00906766
identifier: NNT: 2012GRENV027
keyword: analyse-transcriptomique
keyword: brain-tumor
keyword: cible-therapeutique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: microbeam-radiation-therapy
keyword: radiotherapie-par-microfaiscea
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: therapeutic-target
keyword: theses
keyword: transcriptomic-analysis
keyword: tumeur-cerebrale
issued: 2026-05-08T04:17:47.255144
modified: 2026-05-08T04:17:47.255149
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

differential response of healthy and tumoral tissu after microbeam radiation therapy
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00906766
issued: 2026-05-08T04:17:47.260327
modified: 2026-05-08T04:17:47.242313