期刊
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
卷 45, 期 2, 页码 245-251出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dci.2014.03.015
关键词
miR-8; U-shaped; Toll; Dorsal; Immune homeostasis; Drosophila
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2012R1A1A1009732]
- National Research Foundation of Korea [2012R1A1A1009732] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
MicroRNAs (miRNAs) are noncoding, around 22-nucleotide-long RNAs that exert significant modulatory roles in gene expression throughout the genome. As such, miRNAs take part in and modulate almost all biological processes like cell growth, development, and immunity. We previously showed that miR-8 miRNA plays a role in maintaining immune homeostasis in Drosophila. Here, we further discovered that targeting of multiple coding genes by miR-8 contributes to the maintenance of immune homeostasis. Toll and Dorsal, respectively the receptor and transcription factor in the Toll immune pathway, were found to be miR-8 targets, as shown by reporter assays and miR-8 null flies. Moreover, U-shaped (Ush), a previously verified miR-8 target, was seen to mediate miR-8 regulation of immune homeostasis. Consistently, overexpression of either Dorsal or Ush in the fat body led to increased Drosomycin expression, mimicking that induced by deletion of miR-8. Furthermore, mutation in Toll immune pathway or Ush rescues the abnormal expression of Drosomycin and lethality in miR-8 mutant. Thus, miR-8 regulates Drosophila immune homeostasis by targeting multiple immune genes, thereby contributing to survival. (C) 2014 Elsevier Ltd. All rights reserved.
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