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Article

IGF-1 Haploinsufficiency Causes Age-Related Chronic Cochlear Inflammation and Increases Noise-Induced Hearing Loss

1
Institute for Biomedical Research “Alberto Sols” (IIBM), Spanish National Research Council-Autonomous University of Madrid (CSIC-UAM), 28029 Madrid, Spain
2
Rare Diseases Biomedical Research Networking Centre (CIBERER), The Institute of Health Carlos III (ISCIII), 28029 Madrid, Spain
3
Hospital La Paz Institute for Health Research (IdiPAZ), 28029 Madrid, Spain
4
Allergy Service, Gregorio Marañon General University Hospital, 28009 Madrid, Spain
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Gregorio Marañon Health Research Institute (IiSGM), 28009 Madrid, Spain
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Department of Physiology, Faculty of Medicine and Dentistry, University of Valencia, Spain and FIHCUV-INCLIVA, 46010 Valencia, Spain
7
Department of Anatomy, Histology & Neuroscience, Medical School, Autonomous University of Madrid, 28029 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: Haim Werner
Cells 2021, 10(7), 1686; https://doi.org/10.3390/cells10071686
Received: 10 June 2021 / Revised: 28 June 2021 / Accepted: 28 June 2021 / Published: 3 July 2021
(This article belongs to the Special Issue Insulin-Like Growth Factors in Development, Cancers and Aging 2021)
Insulin-like growth factor 1 (IGF-1) deficiency is an ultrarare syndromic human sensorineural deafness. Accordingly, IGF-1 is essential for the postnatal maturation of the cochlea and the correct wiring of hearing in mice. Less severe decreases in human IGF-1 levels have been associated with other hearing loss rare genetic syndromes, as well as with age-related hearing loss (ARHL). However, the underlying mechanisms linking IGF-1 haploinsufficiency with auditory pathology and ARHL have not been studied. Igf1-heterozygous mice express less Igf1 transcription and have 40% lower IGF-1 serum levels than wild-type mice. Along with ageing, IGF-1 levels decreased concomitantly with the increased expression of inflammatory cytokines, Tgfb1 and Il1b, but there was no associated hearing loss. However, noise exposure of these mice caused increased injury to sensory hair cells and irreversible hearing loss. Concomitantly, there was a significant alteration in the expression ratio of pro- and anti-inflammatory cytokines in Igf1+/− mice. Unbalanced inflammation led to the activation of the stress kinase JNK and the failure to activate AKT. Our data show that IGF-1 haploinsufficiency causes a chronic subclinical proinflammatory age-associated state and, consequently, greater susceptibility to stressors. This work provides the molecular bases to further understand hearing disorders linked to IGF-1 deficiency. View Full-Text
Keywords: AKT; apoptosis; ARHL; IL1β; JNK; NIHL; TGFβ1 AKT; apoptosis; ARHL; IL1β; JNK; NIHL; TGFβ1
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MDPI and ACS Style

Celaya, A.M.; Rodríguez-de la Rosa, L.; Bermúdez-Muñoz, J.M.; Zubeldia, J.M.; Romá-Mateo, C.; Avendaño, C.; Pallardó, F.V.; Varela-Nieto, I. IGF-1 Haploinsufficiency Causes Age-Related Chronic Cochlear Inflammation and Increases Noise-Induced Hearing Loss. Cells 2021, 10, 1686. https://doi.org/10.3390/cells10071686

AMA Style

Celaya AM, Rodríguez-de la Rosa L, Bermúdez-Muñoz JM, Zubeldia JM, Romá-Mateo C, Avendaño C, Pallardó FV, Varela-Nieto I. IGF-1 Haploinsufficiency Causes Age-Related Chronic Cochlear Inflammation and Increases Noise-Induced Hearing Loss. Cells. 2021; 10(7):1686. https://doi.org/10.3390/cells10071686

Chicago/Turabian Style

Celaya, Adelaida M., Lourdes Rodríguez-de la Rosa, Jose M. Bermúdez-Muñoz, José M. Zubeldia, Carlos Romá-Mateo, Carlos Avendaño, Federico V. Pallardó, and Isabel Varela-Nieto. 2021. "IGF-1 Haploinsufficiency Causes Age-Related Chronic Cochlear Inflammation and Increases Noise-Induced Hearing Loss" Cells 10, no. 7: 1686. https://doi.org/10.3390/cells10071686

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