title: L-selenomethionine modulates high LET radiation-induced alterations of gene expression in cultured human thyroid cells.
abstract: L-selenomethionine (SeM) is emerging as a highly effective protective agent against radiation-induced biological effects. We have shown its protective effect on space radiation-induced death of MCF-10 cells as well as on space radiation-induced transformation of HTori-3 cells. The present study was aimed at elucidation of molecular mechanisms and cellular pathways involved in SeM-mediated radioprotection. Human thyroid epithelial cells (HTori-3 cells), in the presence or absence of SeM, were exposed to a non-toxic or a slightly toxic radiation dose from 1 GeV/n iron ions (10 cGy and 20 cGy, respectively). Total RNA was prepared and changes in gene expression were analyzed using microarray technology. Our analysis has revealed a dramatic effect of SeM on alterations of gene expression caused by space radiation. This study provides a basis for furthering our knowledge about radiation-induced molecular and cellular changes that lead to cellular transformation and death.
authors.affiliation: Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6072, USA.
authors.forename: Jelena
authors.initials: J
authors.lastname: Stewart
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Ware
authors.forename: Paolo
authors.initials: P
authors.lastname: Fortina
authors.forename: Jim
authors.initials: J
authors.lastname: Breaux
authors.forename: Sandeep
authors.initials: S
authors.lastname: Gulati
authors.forename: Ann
authors.initials: A
authors.lastname: Kennedy
mesh_terms: D000337:Aerospace Medicine; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D002471:Cell Transformation, Neoplastic / Q000187:drug effects / Q000528:radiation effects; D003359:Cosmic Radiation; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000528:radiation effects*; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012645:Selenomethionine / Q000494:pharmacology*; D013961:Thyroid Gland / Q000187:drug effects* / Q000528:radiation effects*
chemical_list: D012333:RNA, Messenger; D012645:Selenomethionine