title: Transcriptomic analysis of rat brain tissue following gamma knife surgery: early and distinct bilateral effects in the un-irradiated striatum.
abstract: Gamma knife surgery (GKS) is used for the treatment of various human brain disorders. However, the biological effects of gamma ray irradiation on both the target area, and the surrounding tissues are not well studied. The effects of gamma ray exposure to both targeted and untargeted regions were therefore evaluated by monitoring gene expression changes in the unilateral irradiated (60 Gy) and contralateral un-irradiated striata in the rat. Striata of irradiated and control brains were dissected 16 hours post-irradiation for analysis using a whole genome 44K DNA oligo microarray approach. The results revealed 230 induced and 144 repressed genes in the irradiated striatum and 432 induced and 239 repressed genes in the un-irradiated striatum. Out of these altered genes 39 of the induced and 16 of the reduced genes were common to both irradiated and un-irradiated tissue. Results of semiquantitative, confirmatory RT-PCR and western blot analyses suggested that gamma-irradiation caused cellular damage, including oxidative stress, in the striata of both hemispheres of the brains of treated animals.
authors.affiliation: Health Technology Research Center, National Institute of Advanced Industrial Science and Technology (AIST) West, 16-1 Onogawa, Tsukuba, 305-8569, Ibaraki, Japan.
authors.forename: Misato
authors.initials: M
authors.lastname: Hirano
authors.forename: Junko
authors.initials: J
authors.lastname: Shibato
authors.forename: Randeep
authors.initials: R
authors.lastname: Rakwal
authors.forename: Nobuo
authors.initials: N
authors.lastname: Kouyama
authors.forename: Yoko
authors.initials: Y
authors.lastname: Katayama
authors.forename: Motohiro
authors.initials: M
authors.lastname: Hayashi
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Masuo
mesh_terms: D000818:Animals; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism* / Q000601:surgery*; D002478:Cells, Cultured; D003342:Corpus Striatum / Q000378:metabolism* / Q000601:surgery*; D015870:Gene Expression / Q000528:radiation effects*; D020869:Gene Expression Profiling; D008297:Male; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016634:Radiosurgery; D051381:Rats; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger