In order to investigate the potential regulatory roles of microRNAs (miRNAs) in mouse response to ionizing radiation (IR), the small RNA libraries from liver tissues of mice with or without ionizing radiation (IR) were sequenced by high-throughput deep sequencing technology. A total of 270 miRNAs including 212 known and 58 potentially novel miRNAs were identified. Within these miRNAs, there were 48 miRNAs that were differentially expressed, including 27 known and 21 novel miRNAs. The results of quantitative RT-polymerase chain reaction (qRT-PCR) were in consistent with the sequencing analysis. Target gene prediction, function annotation, and pathway of the identified miRNAs were analyzed using RNAhybrid, miRanda software and Swiss-Prot, Gene Ontology (GO), Clusters of Orthologous Groups (COG), Kyoto Encyclopedia of Genes, and Genomes (KEGG) and non-redundant (NR) databases. These results should be useful to investigate the biological function of miRNAs under IR-induced liver injury.
To investigate the potential regulatory roles of microRNA (miRNA) in mouse response to ionizing radiation (IR)-induced thymus injury, miRNA expression profiles of mouse thymus with or without IR were analyzed using deep sequencing technology. Potential target candidates of the identified miRNA were predicted using RNAhybrid and miRanda. Differently expressed miRNA targets functional annotation and pathways were noted using Swiss-Prot, Gene Ontology (GO), Clusters of Orthologous Groups (COG), Kyoto Encyclopedia of Genes and Genomes (KEGG) and non-redundant (NR) databases. In this study, there were 112 differently expressed miRNAs identified, including 45 known mature and 67 novel miRNAs, which meanwhile contained 77 up-regulated and 35 down-regulated miRNAs. The results of quantitative RT-polymerase chain reaction (qRT-PCR) verification were in agreement with the sequencing analysis. And the target genes of miRNA were annotated. These results revealed the differences of miRNA expression, further extended the biological knowledge and greatly facilitated future studies on the function of miRNA in IR-induced thymus injury.
The objectives of this work are to investigate the protective effect of Polyphenols from pinecones of Pinus koraiensis (PPPK) on damage caused by radiation in mice, and to test for its potential synergism with Auricularia auricula‐judae (Bull.) J. Schröt Polysaccharides (AAP). Male mice are administered for 30 days prior to radiation, and the combination index (CI) is used for the synergistic effect analysis. The results show that PPPK exhibited significant radioprotective effects compared with radiation group (P < 0.01); PPPK in combination with AAP had higher anti‐radiation effects, as evident by improved white blood cells (P < 0.01), organ indexes (P < 0.05 or 0.01), splenic lymphocytes proliferation activity (P < 0.01), bone marrow DNA content (P < 0.01), and monocyte phagocytic activity (P < 0.05), relative to other groups; the combination also reduced bone marrow micronucleus rate (P < 0.01) and chromosome distortion rate (P < 0.01). These data for the first time demonstrated the radioprotective effect of PPPK and its synergistic effect with AAP.
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