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Temporospatial expression and cellular localization of VGLUT3 in the rat cochlea.
MedLine Citation:
PMID:  24064385     Owner:  NLM     Status:  Publisher    
Vesicular glutamate transporter 3 (VGLUT3) plays an important role in hearing, and VGLUT3 knockout mice are deaf. However, the mechanisms whereby VGLUT3 exerts its effects in the cochlea are not well established. Elucidating the developmental and aging dynamics of VGLUT3 localization and expression in the cochlea would aid a functional understanding of auditory glutamatergic transmission. In this study, we characterized the expression of VGLUT3 in rat auditory epithelium and spiral ganglion cells (SGCs) during postnatal development and with age using immunohistochemistry and quantitative real-time reverse transcription polymerase chain reaction (RT-PCR). We observed VGLUT3 expression in cochlea inner hair cells (IHCs) and SGCs as early as postnatally, and its expression increased gradually with maturity. However, the expression of VGLUT3 in the IHCs decreased in the aging rats compared to postnatal day 60 (P60), and VGLUT3 was still expressed in the remaining SGCs in the aging rats. VGLUT3-immunopositive punctate structures were only found in the cytoplasm of SGCs, not IHCs, at P7, or later. Variation in VGLUT3 mRNA expression evaluated by quantitative real time RT-PCR was consistent with the immunohistochemical data except for no statistical difference between P60 and aging rats in the whole cochlea level. Our data suggest that VGLUT3 likely has developmental and physiological roles in the rat cochlea during postnatal development as well as later in life. VGLUT3 may have additional unknown roles in SGCs besides glutamate transport.
Zhe Peng; Guo-Peng Wang; Rong Zeng; Jing-Ying Guo; Cheng-Fang Chen; Shu-Sheng Gong
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-9-21
Journal Detail:
Title:  Brain research     Volume:  -     ISSN:  1872-6240     ISO Abbreviation:  Brain Res.     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-9-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 Published by Elsevier B.V.
Department of Otolaryngology-Head and Neck Surgery, Key Laboratory of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
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