Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity
ObjectivesInsulin-like growth factors (IGFs) are known to be neurotrophic factors, and they efficiently signal to cells to grow, differentiate and survive. The purpose of study was to identify the expressions of IGFs in mice with salicylate ototoxicity, which is a typical reversible hearing loss mod...
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| Format: | Article |
| Language: | English |
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Korean Society of Otorhinolaryngology-Head and Neck Surgery
2010-09-01
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| Series: | Clinical and Experimental Otorhinolaryngology |
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| Online Access: | http://www.e-ceo.org/upload/pdf/ceo-3-115.pdf |
| _version_ | 1819152442994982912 |
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| author | Gi Jung Im June Choi Ji Won Chang Seo Jin Kim Hye In Kim Hak Hyun Jung |
| author_facet | Gi Jung Im June Choi Ji Won Chang Seo Jin Kim Hye In Kim Hak Hyun Jung |
| author_sort | Gi Jung Im |
| collection | DOAJ |
| description | ObjectivesInsulin-like growth factors (IGFs) are known to be neurotrophic factors, and they efficiently signal to cells to grow, differentiate and survive. The purpose of study was to identify the expressions of IGFs in mice with salicylate ototoxicity, which is a typical reversible hearing loss model.MethodsThe mice were given intraperitoneal injections of salicylate (400 mg/kg) and about a 30 dB threshold shift was achieved at 3 hours. The expressions of IGF-1 and 2 were confirmed by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) and Western blotting. Localization of IGFs was confirmed using confocal immunofluorescence imaging. For in-vitro study on the HEI-OC1 auditory cells, the cell viability was calculated and the apoptotic features of the nuclei were observed with Hoechst staining.ResultsThe expressions of the IGFs mRNA and protein were significantly increased in the salicylate ototoxicity groups compared with that of the normal control group. Salicylate induced apoptosis and decreased viability of the HEI-OC1 auditory cells in a time- and dose-dependent manner. The expressions of IGFs were localized in the stria vascularis, and these IGFs play a protective role in the in-vivo condition of salicylate ototoxicity.ConclusionIGFs were highly expressed in the mice with salicylate ototoxicity, and this expression was mainly focused in the stria vascularis in the salicylate intoxicated mice. The systemic action of IGFs, which were expressed in the vascular-rich stria vascularis, can act as a major protective mechanism in a mouse model of salicylate ototoxicity. |
| first_indexed | 2024-12-22T14:49:22Z |
| format | Article |
| id | doaj.art-0ee0cf9fb3904f1eb19a49c528d0cebc |
| institution | Directory Open Access Journal |
| issn | 1976-8710 2005-0720 |
| language | English |
| last_indexed | 2024-12-22T14:49:22Z |
| publishDate | 2010-09-01 |
| publisher | Korean Society of Otorhinolaryngology-Head and Neck Surgery |
| record_format | Article |
| series | Clinical and Experimental Otorhinolaryngology |
| spelling | doaj.art-0ee0cf9fb3904f1eb19a49c528d0cebc2022-12-21T18:22:21ZengKorean Society of Otorhinolaryngology-Head and Neck SurgeryClinical and Experimental Otorhinolaryngology1976-87102005-07202010-09-013311512110.3342/ceo.2010.3.3.11585Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate OtotoxicityGi Jung Im0June Choi1Ji Won Chang2Seo Jin Kim3Hye In Kim4Hak Hyun Jung5Department of Otolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.Department of Otolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.Department of Otolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.Department of Biomedical Sciences, Korea University, Seoul, Korea.Johns Hopkins University, Baltimore, MD, USA.Department of Otolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.ObjectivesInsulin-like growth factors (IGFs) are known to be neurotrophic factors, and they efficiently signal to cells to grow, differentiate and survive. The purpose of study was to identify the expressions of IGFs in mice with salicylate ototoxicity, which is a typical reversible hearing loss model.MethodsThe mice were given intraperitoneal injections of salicylate (400 mg/kg) and about a 30 dB threshold shift was achieved at 3 hours. The expressions of IGF-1 and 2 were confirmed by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) and Western blotting. Localization of IGFs was confirmed using confocal immunofluorescence imaging. For in-vitro study on the HEI-OC1 auditory cells, the cell viability was calculated and the apoptotic features of the nuclei were observed with Hoechst staining.ResultsThe expressions of the IGFs mRNA and protein were significantly increased in the salicylate ototoxicity groups compared with that of the normal control group. Salicylate induced apoptosis and decreased viability of the HEI-OC1 auditory cells in a time- and dose-dependent manner. The expressions of IGFs were localized in the stria vascularis, and these IGFs play a protective role in the in-vivo condition of salicylate ototoxicity.ConclusionIGFs were highly expressed in the mice with salicylate ototoxicity, and this expression was mainly focused in the stria vascularis in the salicylate intoxicated mice. The systemic action of IGFs, which were expressed in the vascular-rich stria vascularis, can act as a major protective mechanism in a mouse model of salicylate ototoxicity.http://www.e-ceo.org/upload/pdf/ceo-3-115.pdfInsulin-like growth factorSalicylateOtotoxicityCochlea |
| spellingShingle | Gi Jung Im June Choi Ji Won Chang Seo Jin Kim Hye In Kim Hak Hyun Jung Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity Clinical and Experimental Otorhinolaryngology Insulin-like growth factor Salicylate Ototoxicity Cochlea |
| title | Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity |
| title_full | Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity |
| title_fullStr | Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity |
| title_full_unstemmed | Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity |
| title_short | Expression of Insulin-like Growth Factors in a Mouse Model of Salicylate Ototoxicity |
| title_sort | expression of insulin like growth factors in a mouse model of salicylate ototoxicity |
| topic | Insulin-like growth factor Salicylate Ototoxicity Cochlea |
| url | http://www.e-ceo.org/upload/pdf/ceo-3-115.pdf |
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