Hayashi Y, Yamamoto N, Nakagawa T, Ito J. Insulin-like growth factor 1 induces the transcription of Gap43 and Ntn1 during hair cell protection in the neonatal murine cochlea.
Neurosci Lett 2013;
560:7-11. [PMID:
24333914 DOI:
10.1016/j.neulet.2013.11.062]
[Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 11/09/2013] [Accepted: 11/29/2013] [Indexed: 01/28/2023]
Abstract
We previously reported that insulin-like growth factor 1 (IGF-1) protects cochlear hair cells against aminoglycosides through activation of the PI3K/Akt and MEK/ERK pathways in supporting cells. In this study, we found that IGF-1 up-regulated the expression levels of Gap43 and Ntn1 as measured using cDNA microarray analysis and qRT-PCR. Using inhibitors of the PI3K/Akt and MEK/ERK pathways, we reveal that both pathways are involved in the up-regulation of Gap43 and Ntn1 expression. Moreover the time window of Gap43 and Ntn1 transcription was limited to within 12h after IGF-1 treatment, indicating that downstream gene expression was tightly controlled by IGF-1.
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