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Kim YJ, Lee JS, Kim H, Jang JH, Choung YH. Gap Junction-Mediated Intercellular Communication of cAMP Prevents CDDP-Induced Ototoxicity via cAMP/PKA/CREB Pathway. Int J Mol Sci 2021; 22:6327. [PMID: 34199197 PMCID: PMC8231879 DOI: 10.3390/ijms22126327] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/07/2021] [Accepted: 06/10/2021] [Indexed: 02/06/2023] Open
Abstract
In the cochlea, non-sensory supporting cells are directly connected to adjacent supporting cells via gap junctions that allow the exchange of small molecules. We have previously shown that the pharmacological regulation of gap junctions alleviates cisplatin (CDDP)-induced ototoxicity in animal models. In this study, we aimed to identify specific small molecules that pass through gap junctions in the process of CDDP-induced auditory cell death and suggest new mechanisms to prevent hearing loss. We found that the cyclic adenosine monophosphate (cAMP) inducer forskolin (FSK) significantly attenuated CDDP-induced auditory cell death in vitro and ex vivo. The activation of cAMP/PKA/CREB signaling was observed in organ of Corti primary cells treated with FSK, especially in supporting cells. Co-treatment with gap junction enhancers such as all-trans retinoic acid (ATRA) and quinoline showed potentiating effects with FSK on cell survival via activation of cAMP/PKA/CREB. In vivo, the combination of FSK and ATRA was more effective for preventing ototoxicity compared to either single treatment. Our study provides the new insight that gap junction-mediated intercellular communication of cAMP may prevent CDDP-induced ototoxicity.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jin-Sol Lee
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
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El Charif O, Mapes B, Trendowski MR, Wheeler HE, Wing C, Dinh PC, Frisina RD, Feldman DR, Hamilton RJ, Vaughn DJ, Fung C, Kollmannsberger C, Mushiroda T, Kubo M, Gamazon ER, Cox NJ, Huddart R, Ardeshir-Rouhani-Fard S, Monahan P, Fossa SD, Einhorn LH, Travis LB, Dolan ME. Clinical and Genome-wide Analysis of Cisplatin-induced Tinnitus Implicates Novel Ototoxic Mechanisms. Clin Cancer Res 2019; 25:4104-4116. [PMID: 30952644 DOI: 10.1158/1078-0432.ccr-18-3179] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 02/13/2019] [Accepted: 03/25/2019] [Indexed: 12/11/2022]
Abstract
PURPOSE Cisplatin, a commonly used chemotherapeutic, results in tinnitus, the phantom perception of sound. Our purpose was to identify the clinical and genetic determinants of tinnitus among testicular cancer survivors (TCS) following cisplatin-based chemotherapy. EXPERIMENTAL DESIGN TCS (n = 762) were dichotomized to cases (moderate/severe tinnitus; n = 154) and controls (none; n = 608). Logistic regression was used to evaluate associations with comorbidities and SNP dosages in genome-wide association study (GWAS) following quality control and imputation (covariates: age, noise exposure, cisplatin dose, genetic principal components). Pathway over-representation tests and functional studies in mouse auditory cells were performed. RESULTS Cisplatin-induced tinnitus (CisIT) significantly associated with age at diagnosis (P = 0.007) and cumulative cisplatin dose (P = 0.007). CisIT prevalence was not significantly greater in 400 mg/m2-treated TCS compared with 300 (P = 0.41), but doses >400 mg/m2 (median 580, range 402-828) increased risk by 2.61-fold (P < 0.0001). CisIT cases had worse hearing at each frequency (0.25-12 kHz, P < 0.0001), and reported more vertigo (OR = 6.47; P < 0.0001) and problems hearing in a crowd (OR = 8.22; P < 0.0001) than controls. Cases reported poorer health (P < 0.0001) and greater psychotropic medication use (OR = 2.4; P = 0.003). GWAS suggested a variant near OTOS (rs7606353, P = 2 × 10-6) and OTOS eQTLs were significantly enriched independently of that SNP (P = 0.018). OTOS overexpression in HEI-OC1, a mouse auditory cell line, resulted in resistance to cisplatin-induced cytotoxicity. Pathway analysis implicated potassium ion transport (q = 0.007). CONCLUSIONS CisIT associated with several neuro-otological symptoms, increased use of psychotropic medication, and poorer health. OTOS, expressed in the cochlear lateral wall, was implicated as protective. Future studies should investigate otoprotective targets in supporting cochlear cells.
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Affiliation(s)
- Omar El Charif
- Department of Medicine, University of Chicago, Chicago, Illinois
| | - Brandon Mapes
- Department of Medicine, University of Chicago, Chicago, Illinois
| | | | - Heather E Wheeler
- Departments of Biology and Computer Science, Loyola University Chicago, Chicago, Illinois
| | - Claudia Wing
- Department of Medicine, University of Chicago, Chicago, Illinois
| | - Paul C Dinh
- Department of Medical Oncology, Indiana University, Indianapolis, Indiana
| | - Robert D Frisina
- Departments of Medical and Chemical & Biomolecular Engineering and Communication Sciences & Disorders, Global Center for Hearing and Speech Research, University of South Florida, Tampa, Florida
| | - Darren R Feldman
- Department of Medical Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Robert J Hamilton
- Department of Surgical Oncology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - David J Vaughn
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Chunkit Fung
- J.P. Wilmot Cancer Institute, University of Rochester Medical Center, Rochester, New York
| | | | | | - Michiaki Kubo
- RIKEN Center for Integrative Medical Science, Yokohama, Japan
| | - Eric R Gamazon
- Clare Hall, University of Cambridge, Cambridge, United Kingdom.,Vanderbilt University Medical Center, Nashville, Tennessee
| | - Nancy J Cox
- Vanderbilt University Medical Center, Nashville, Tennessee
| | | | | | - Patrick Monahan
- Department of Medical Oncology, Indiana University, Indianapolis, Indiana
| | - Sophie D Fossa
- Department of Oncology, Oslo University Hospital, Radiumhospital, Oslo, Norway
| | - Lawrence H Einhorn
- Department of Medical Oncology, Indiana University, Indianapolis, Indiana
| | - Lois B Travis
- Department of Medical Oncology, Indiana University, Indianapolis, Indiana.
| | - M Eileen Dolan
- Department of Medicine, University of Chicago, Chicago, Illinois.
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Shodo R, Hayatsu M, Koga D, Horii A, Ushiki T. Three-dimensional reconstruction of root cells and interdental cells in the rat inner ear by serial section scanning electron microscopy. Biomed Res 2018; 38:239-248. [PMID: 28794401 DOI: 10.2220/biomedres.38.239] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the cochlea, a high K+ environment in the endolymph is essential for the maintenance of normal hearing function, and the transport of K+ ions through gap junctions of the cochlear epithelium is thought to play an important role in endolymphatic homeostasis. The aim of the present study was to demonstrate the three-dimensional (3D) ultrastructure of spiral ligament root cells and interdental cells, which are located at both ends of the gap junction system of the cochlea epithelium. Serial semi-thin sections of plastic-embedded rat cochlea were mounted on glass slides, stained with uranyl acetate and lead citrate, and observed by scanning electron microscopy (SEM) using the backscattered electron (BSE) mode. 3D reconstruction of BSE images of serial sections revealed that the root cells were linked together to form a branched structure like an elaborate "tree root" in the spiral ligament. The interdental cells were also connected to each other, forming a comb-shaped cellular network with a number of cellular strands in the spiral limbus. Furthermore, TEM studies of ultra-thin sections revealed the rich presence of gap junctions in both root cells and interdental cells. These findings suggest the possibility that both root cells and interdental cells contribute to K+ circulation as the end portion of the epithelial cell gap junction system of the cochlea.
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Affiliation(s)
- Ryusuke Shodo
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences.,Department of Otolaryngology Head and Neck Surgery, Niigata University Graduate School of Medical and Dental Sciences
| | - Manabu Hayatsu
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences
| | - Daisuke Koga
- Department of Microscopic Anatomy and Cell Biology, Asahikawa Medical University
| | - Arata Horii
- Department of Otolaryngology Head and Neck Surgery, Niigata University Graduate School of Medical and Dental Sciences
| | - Tatsuo Ushiki
- Division of Microscopic Anatomy, Niigata University Graduate School of Medical and Dental Sciences
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