title: Identification of a microRNA regulator for axon guidance in the olfactory bulb of adult mice.
abstract: Semaphorin3A (sema3a), mainly localized in the olfactory neuron layer and periglomerular layer, is essential for the normal arrangement of axons in the olfactory bulb both in embryonic and adult mice functioning through its dynamic spatiotemporal expression. The regulators that can modulate the expression of sema3a by direct interaction, however, are unknown. In order to find the regulators of sema3a in the olfactory bulb, we focused on microRNAs, well-known post-transcriptional regulators. We found that axon guidance is the main molecular and biological process ongoing in the steady-state olfactory bulb of the adult mouse by screening the abundant microRNAs and exploring their functions in the olfactory bulb via our customized microRNA arrays, Gene Ontology and Kyoto Encyclopedia of Genes annotation. Furthermore, we traced the expression of three candidate regulators (miR-30c, miR-200b, and miR-429) and sema3a by the quantitative real-time polymerase chain reaction and immunohistochemistry. The results showed that only miR-30c expression corresponded inversely with sema3a. Finally, miR-30c was verified to be a specific regulator of sema3a by dual luciferase reporter assay in vitro. Taken together, our results suggested that miR-30c is a potential regulator in axon-guidance by suppressing the expression of sema3a, which will give new insights in elucidating the mechanism of architectonic and functional maintenance of the olfactory bulb.
authors.affiliation: Institute of Neuroscience and Anatomy, Zhejiang University School of Medicine, Hangzhou, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Sun
authors.affiliation: Institute of Neuroscience and Anatomy, Zhejiang University School of Medicine, Hangzhou, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Li
authors.affiliation: Institute of Neuroscience and Anatomy, Zhejiang University School of Medicine, Hangzhou, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: Institute of Life Science, Zhejiang University, Hangzhou, China.
authors.forename: Yifei
authors.initials: Y
authors.lastname: Yin
authors.affiliation: Institute of Neuroscience and Anatomy, Zhejiang University School of Medicine, Hangzhou, China. Electronic address: lingshucai@zju.edu.cn.
authors.forename: Shucai
authors.initials: S
authors.lastname: Ling
mesh_terms: D000818:Animals; D001369:Axons / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D009830:Olfactory Bulb / Q000166:cytology / Q000378:metabolism*; D040121:Semaphorin-3A / Q000235:genetics / Q000378:metabolism*
chemical_list: D035683:MicroRNAs; C534715:Mirn30d microRNA, mouse; C488217:Sema3a protein, mouse; D040121:Semaphorin-3A
keywords: Axon guidance; Olfactory bulb; Semaphorin3A; miR-30c