Microarray analysis of differentially expressed genes in mouse bone marrow tissues after ionizing radiation

• Published in: International journal of radiation biology 2006-07, Vol.82 (7), p.511-521
• Main Authors: Dai, Jin Ming, Sun, Dao Chun, Lin, Ru Xian, Yang, Jing, Lou, Shaoke, Wang, Sheng Qi
• Format: Article
• Language: English
• Subjects: Animals; Bone marrow; Bone Marrow - metabolism; Bone Marrow - radiation effects; differentially expression; Dose-Response Relationship, Radiation; Female; Gene Expression - physiology; Gene Expression - radiation effects; Gene Expression Profiling - methods; ionizing radiation; Male; Mice; Mice, Inbred C57BL; Oligonucleotide Array Sequence Analysis - methods; Proteome - metabolism; Radiation Dosage; Radiation, Ionizing; SIRT1
• ISSN: 0955-3002; 1362-3095
• DOI: 10.1080/09553000600857389

Purpose: To identify differentially expressed genes in mouse bone marrow involved in radiation-induced injury. Materials and methods: Microarray analysis was used to identify the differentially expressed genes and other techniques, e.g., polymerase chain reaction (PCR), western-blotting and antisense were also used to validate the results. Results: DNA microarray analysis demonstrated that the mRNA of 34 genes increased and 69 genes decreased in mouse bone marrow cells (BMC) from C57BL mice 6h after a whole body dose of 6.5 Gy. These differentially expressed genes were involved in a number of processes including DNA replication repair, proliferation apoptosis, cell cycle control and RNA processing. In these experiments, a decline of the mammalian homolog Sir2a (an acronym for the silent mating type information regulation 2 homolog [SIRT1]) mRNA accompanied by an increase of P53 protein acetylation was observed in irradiated BMC. To determine whether the reduced SIRT1 is related to the higher acetylation status of P53 after irradiation, we designed and synthesized antisense oligonucleotides (AS) targeting human SIRT1 mRNA. Notably, AS transfection increased tumor protein 53 (P53) protein acetylation and bax-luciferase activity in human bone marrow stromal cell line (HS-5) after radiation. Furthermore, the AS transfer stimulated cell apoptosis in post-irradiation HS-5 cells. Conclusion: Ionizing radiation (IR) affects the expression of a series of genes including genes involved in G1 S transition and the P53 pathway. Among those, reduction of SIRT1 was seen to be involved in transactivation of P53.