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Zarus GM, Ruiz P, Benedict R, Brenner S, Carlson K, Jeong L, Morata TC. Which Environmental Pollutants Are Toxic to Our Ears?-Evidence of the Ototoxicity of Common Substances. TOXICS 2024; 12:650. [PMID: 39330578 PMCID: PMC11435700 DOI: 10.3390/toxics12090650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2024] [Revised: 08/27/2024] [Accepted: 08/28/2024] [Indexed: 09/28/2024]
Abstract
Ototoxicity refers to the adverse effects of substances on auditory or vestibular functions. This study examines the evidence of ototoxicity's association with exposure to common environmental pollutants, as documented in toxicological profiles by the Agency for Toxic Substances and Disease Registry. Our aim was to evaluate whether the evidence supports modifying the charting of ototoxic effects in the summary tables of these toxicological profiles and providing a guide for scientists to access these data. Health outcomes of interest included hearing loss, vestibular effects, cochlear lesions, tonal alterations, cellular damage, and ototoxicity-related outcomes (neurological, nephrotoxic, hepatic, and developmental effects). We obtained ototoxicity information for 62 substances. Hearing-related effects were reported, along with neurological effects. Overall, 26 profiles reported strong evidence of ototoxicity, including 13 substances previously designated as ototoxic by other health and safety agencies. Commonly studied outcomes included hearing loss, damage to ear anatomy, and auditory dysfunction. Vestibular dysfunction and tinnitus are rarely studied. Our findings highlight the lack of conclusive evidence of ototoxic properties for many substances, especially for pesticides and herbicides. This review supports charting the evidence of ototoxicity separately in toxicological profiles' summary tables. Improving the communication of ototoxicity-related health effects might impact their recognition and prompt further research. A stronger evidence base could support improved prevention efforts in terms of serious health outcomes.
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Affiliation(s)
- Gregory M. Zarus
- Agency for Toxic Substances and Disease Registry, Office of Innovation and Analytics, Atlanta, GA 30341, USA; (P.R.); (R.B.); (S.B.)
| | - Patricia Ruiz
- Agency for Toxic Substances and Disease Registry, Office of Innovation and Analytics, Atlanta, GA 30341, USA; (P.R.); (R.B.); (S.B.)
| | - Rae Benedict
- Agency for Toxic Substances and Disease Registry, Office of Innovation and Analytics, Atlanta, GA 30341, USA; (P.R.); (R.B.); (S.B.)
| | - Stephan Brenner
- Agency for Toxic Substances and Disease Registry, Office of Innovation and Analytics, Atlanta, GA 30341, USA; (P.R.); (R.B.); (S.B.)
| | - Krystin Carlson
- National Institute for Occupational Safety and Health, Cincinnati, OH 45226, USA; (K.C.); (T.C.M.)
| | - Layna Jeong
- Georgia Tech School of Biological Sciences, Atlanta, GA 30332, USA;
| | - Thais C. Morata
- National Institute for Occupational Safety and Health, Cincinnati, OH 45226, USA; (K.C.); (T.C.M.)
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Jeitner TM, Azcona JA, Ables GP, Cooke D, Horowitz MC, Singh P, Kelly JM, Cooper AJL. Cystine rather than cysteine is the preferred substrate for β-elimination by cystathionine γ-lyase: implications for dietary methionine restriction. GeroScience 2024; 46:3617-3634. [PMID: 37217633 PMCID: PMC11229439 DOI: 10.1007/s11357-023-00788-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 03/31/2023] [Indexed: 05/24/2023] Open
Abstract
Dietary methionine restriction (MR) increases longevity by improving health. In experimental models, MR is accompanied by decreased cystathionine β-synthase activity and increased cystathionine γ-lyase activity. These enzymes are parts of the transsulfuration pathway which produces cysteine and 2-oxobutanoate. Thus, the decrease in cystathionine β-synthase activity is likely to account for the loss of tissue cysteine observed in MR animals. Despite this decrease in cysteine levels, these tissues exhibit increased H2S production which is thought to be generated by β-elimination of the thiol moiety of cysteine, as catalyzed by cystathionine β-synthase or cystathionine γ-lyase. Another possibility for this H2S production is the cystathionine γ-lyase-catalyzed β-elimination of cysteine persulfide from cystine, which upon reduction yields H2S and cysteine. Here, we demonstrate that MR increases cystathionine γ-lyase production and activities in the liver and kidneys, and that cystine is a superior substrate for cystathionine γ-lyase catalyzed β-elimination as compared to cysteine. Moreover, cystine and cystathionine exhibit comparable Kcat/Km values (6000 M-1 s-1) as substrates for cystathionine γ-lyase-catalyzed β-elimination. By contrast, cysteine inhibits cystathionine γ-lyase in a non-competitive manner (Ki ~ 0.5 mM), which limits its ability to function as a substrate for β-elimination by this enzyme. Cysteine inhibits the enzyme by reacting with its pyridoxal 5'-phosphate cofactor to form a thiazolidine and in so doing prevents further catalysis. These enzymological observations are consistent with the notion that during MR cystathionine γ-lyase is repurposed to catabolize cystine and thereby form cysteine persulfide, which upon reduction produces cysteine.
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Affiliation(s)
- Thomas M Jeitner
- Department of Radiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, USA.
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, 10595, USA.
| | - Juan A Azcona
- Department of Radiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, USA
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, 10595, USA
| | - Gene P Ables
- Orentreich Foundation for the Advancement of Science, Inc, 855 Route 301, Cold Spring, NY, 10516, USA
| | - Diana Cooke
- Orentreich Foundation for the Advancement of Science, Inc, 855 Route 301, Cold Spring, NY, 10516, USA
| | - Mark C Horowitz
- Department of Orthopedics and Rehabilitation, Yale University School of Medicine, New Haven, CT, 06510, USA
| | - Pradeep Singh
- Department of Radiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, USA
| | - James M Kelly
- Department of Radiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, USA
- Citigroup Biomedical Imaging Center, Weill Cornell Medicine, 516 East 72Nd St, New York, NY, 10021, USA
| | - Arthur J L Cooper
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, 10595, USA
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Christensen KA, Rondeau EB, Sakhrani D, Biagi CA, Johnson H, Joshi J, Flores AM, Leelakumari S, Moore R, Pandoh PK, Withler RE, Beacham TD, Leggatt RA, Tarpey CM, Seeb LW, Seeb JE, Jones SJM, Devlin RH, Koop BF. The pink salmon genome: Uncovering the genomic consequences of a two-year life cycle. PLoS One 2021; 16:e0255752. [PMID: 34919547 PMCID: PMC8682878 DOI: 10.1371/journal.pone.0255752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 12/02/2021] [Indexed: 12/30/2022] Open
Abstract
Pink salmon (Oncorhynchus gorbuscha) adults are the smallest of the five Pacific salmon native to the western Pacific Ocean. Pink salmon are also the most abundant of these species and account for a large proportion of the commercial value of the salmon fishery worldwide. A two-year life history of pink salmon generates temporally isolated populations that spawn either in even-years or odd-years. To uncover the influence of this genetic isolation, reference genome assemblies were generated for each year-class and whole genome re-sequencing data was collected from salmon of both year-classes. The salmon were sampled from six Canadian rivers and one Japanese river. At multiple centromeres we identified peaks of Fst between year-classes that were millions of base-pairs long. The largest Fst peak was also associated with a million base-pair chromosomal polymorphism found in the odd-year genome near a centromere. These Fst peaks may be the result of a centromere drive or a combination of reduced recombination and genetic drift, and they could influence speciation. Other regions of the genome influenced by odd-year and even-year temporal isolation and tentatively under selection were mostly associated with genes related to immune function, organ development/maintenance, and behaviour.
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Affiliation(s)
- Kris A. Christensen
- West Vancouver, Fisheries and Oceans Canada, British Columbia, Canada
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
- * E-mail: (KAC); (BFK)
| | - Eric B. Rondeau
- West Vancouver, Fisheries and Oceans Canada, British Columbia, Canada
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
- Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, British Columbia, Canada
| | - Dionne Sakhrani
- West Vancouver, Fisheries and Oceans Canada, British Columbia, Canada
| | - Carlo A. Biagi
- West Vancouver, Fisheries and Oceans Canada, British Columbia, Canada
| | - Hollie Johnson
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - Jay Joshi
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - Anne-Marie Flores
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - Sreeja Leelakumari
- Canada’s Michael Smith Genome Sciences Centre, BC Cancer, Vancouver, British Columbia, Canada
| | - Richard Moore
- Canada’s Michael Smith Genome Sciences Centre, BC Cancer, Vancouver, British Columbia, Canada
| | - Pawan K. Pandoh
- Canada’s Michael Smith Genome Sciences Centre, BC Cancer, Vancouver, British Columbia, Canada
| | - Ruth E. Withler
- Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, British Columbia, Canada
| | - Terry D. Beacham
- Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, British Columbia, Canada
| | | | - Carolyn M. Tarpey
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, United States of America
| | - Lisa W. Seeb
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, United States of America
| | - James E. Seeb
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, United States of America
| | - Steven J. M. Jones
- Canada’s Michael Smith Genome Sciences Centre, BC Cancer, Vancouver, British Columbia, Canada
| | - Robert H. Devlin
- West Vancouver, Fisheries and Oceans Canada, British Columbia, Canada
| | - Ben F. Koop
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
- * E-mail: (KAC); (BFK)
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Gojon G, Morales GA. SG1002 and Catenated Divalent Organic Sulfur Compounds as Promising Hydrogen Sulfide Prodrugs. Antioxid Redox Signal 2020; 33:1010-1045. [PMID: 32370538 PMCID: PMC7578191 DOI: 10.1089/ars.2020.8060] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/15/2020] [Accepted: 04/28/2020] [Indexed: 12/13/2022]
Abstract
Significance: Sulfur has a critical role in protein structure/function and redox status/signaling in all living organisms. Although hydrogen sulfide (H2S) and sulfane sulfur (SS) are now recognized as central players in physiology and pathophysiology, the full scope and depth of sulfur metabolome's impact on human health and healthy longevity has been vastly underestimated and is only starting to be grasped. Since many pathological conditions have been related to abnormally low levels of H2S/SS in blood and/or tissues, and are amenable to treatment by H2S supplementation, development of safe and efficacious H2S donors deserves to be undertaken with a sense of urgency; these prodrugs also hold the promise of becoming widely used for disease prevention and as antiaging agents. Recent Advances: Supramolecular tuning of the properties of well-known molecules comprising chains of sulfur atoms (diallyl trisulfide [DATS], S8) was shown to lead to improved donors such as DATS-loaded polymeric nanoparticles and SG1002. Encouraging results in animal models have been obtained with SG1002 in heart failure, atherosclerosis, ischemic damage, and Duchenne muscular dystrophy; with TC-2153 in Alzheimer's disease, schizophrenia, age-related memory decline, fragile X syndrome, and cocaine addiction; and with DATS in brain, colon, gastric, and breast cancer. Critical Issues: Mode-of-action studies on allyl polysulfides, benzyl polysulfides, ajoene, and 12 ring-substituted organic disulfides and thiosulfonates led several groups of researchers to conclude that the anticancer effect of these compounds is not mediated by H2S and is only modulated by reactive oxygen species, and that their central model of action is selective protein S-thiolation. Future Directions: SG1002 is likely to emerge as the H2S donor of choice for acquiring knowledge on this gasotransmitter's effects in animal models, on account of its unique ability to efficiently generate H2S without byproducts and in a slow and sustained mode that is dose independent and enzyme independent. Efficient tuning of H2S donation characteristics of DATS, dibenzyl trisulfide, and other hydrophobic H2S prodrugs for both oral and parenteral administration will be achieved not only by conventional structural modification of a lead molecule but also through the new "supramolecular tuning" paradigm.
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Hsp70/Bmi1-FoxO1-SOD Signaling Pathway Contributes to the Protective Effect of Sound Conditioning against Acute Acoustic Trauma in a Rat Model. Neural Plast 2020; 2020:8823785. [PMID: 33082778 PMCID: PMC7556106 DOI: 10.1155/2020/8823785] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 07/27/2020] [Accepted: 08/05/2020] [Indexed: 02/06/2023] Open
Abstract
Sound conditioning (SC) is defined as “toughening” to lower levels of sound over time, which reduces a subsequent noise-induced threshold shift. Although the protective effect of SC in mammals is generally understood, the exact mechanisms involved have not yet been elucidated. To confirm the protective effect of SC against noise exposure (NE) and the stress-related signaling pathway of its rescue, we observed target molecule changes caused by SC of low frequency prior to NE as well as histology analysis in vivo and verified the suggested mechanisms in SGNs in vitro. Further, we investigated the potential role of Hsp70 and Bmi1 in SC by targeting SOD1 and SOD2 which are regulated by the FoxO1 signaling pathway based on mitochondrial function and reactive oxygen species (ROS) levels. Finally, we sought to identify the possible molecular mechanisms associated with the beneficial effects of SC against noise-induced trauma. Data from the rat model were evaluated by western blot, immunofluorescence, and RT-PCR. The results revealed that SC upregulated Hsp70, Bmi1, FoxO1, SOD1, and SOD2 expression in spiral ganglion neurons (SGNs). Moreover, the auditory brainstem responses (ABRs) and electron microscopy revealed that SC could protect against acute acoustic trauma (AAT) based on a significant reduction of hearing impairment and visible reduction in outer hair cell loss as well as ultrastructural changes in OHCs and SGNs. Collectively, these results suggested that the contribution of Bmi1 toward decreased sensitivity to noise-induced trauma following SC was triggered by Hsp70 induction and associated with enhancement of the antioxidant system and decreased mitochondrial superoxide accumulation. This contribution of Bmi1 was achieved by direct targeting of SOD1 and SOD2, which was regulated by FoxO1. Therefore, the Hsp70/Bmi1-FoxO1-SOD signaling pathway might contribute to the protective effect of SC against AAT in a rat model.
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Nagtegaal AP, Broer L, Zilhao NR, Jakobsdottir J, Bishop CE, Brumat M, Christiansen MW, Cocca M, Gao Y, Heard-Costa NL, Evans DS, Pankratz N, Pratt SR, Price TR, Spankovich C, Stimson MR, Valle K, Vuckovic D, Wells H, Eiriksdottir G, Fransen E, Ikram MA, Li CM, Longstreth WT, Steves C, Van Camp G, Correa A, Cruickshanks KJ, Gasparini P, Girotto G, Kaplan RC, Nalls M, Schweinfurth JM, Seshadri S, Sotoodehnia N, Tranah GJ, Uitterlinden AG, Wilson JG, Gudnason V, Hoffman HJ, Williams FMK, Goedegebure A. Genome-wide association meta-analysis identifies five novel loci for age-related hearing impairment. Sci Rep 2019; 9:15192. [PMID: 31645637 PMCID: PMC6811684 DOI: 10.1038/s41598-019-51630-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 10/04/2019] [Indexed: 12/23/2022] Open
Abstract
Previous research has shown that genes play a substantial role in determining a person's susceptibility to age-related hearing impairment. The existing studies on this subject have different results, which may be caused by difficulties in determining the phenotype or the limited number of participants involved. Here, we have gathered the largest sample to date (discovery n = 9,675; replication n = 10,963; validation n = 356,141), and examined phenotypes that represented low/mid and high frequency hearing loss on the pure tone audiogram. We identified 7 loci that were either replicated and/or validated, of which 5 loci are novel in hearing. Especially the ILDR1 gene is a high profile candidate, as it contains our top SNP, is a known hearing loss gene, has been linked to age-related hearing impairment before, and in addition is preferentially expressed within hair cells of the inner ear. By verifying all previously published SNPs, we can present a paper that combines all new and existing findings to date, giving a complete overview of the genetic architecture of age-related hearing impairment. This is of importance as age-related hearing impairment is highly prevalent in our ageing society and represents a large socio-economic burden.
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Affiliation(s)
- Andries Paul Nagtegaal
- Department of Otorhinolaryngology, Erasmus Medical Center, 3015 CE, Rotterdam, The Netherlands.
| | - Linda Broer
- Department of Internal Medicine, Erasm us Medical Center, 3015 CE, Rotterdam, The Netherlands
| | - Nuno R Zilhao
- Icelandic Heart Association, Holtasmari 1, Kopavogur, IS-201, Iceland
| | | | - Charles E Bishop
- Department of Otolaryngology and Communicative Sciences, The University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | - Marco Brumat
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy
| | - Mark W Christiansen
- Cardiovascular Health Research Unit, University of Washington, Seattle, WA, 98195, USA
| | - Massimiliano Cocca
- Medical Genetics, Institute for Maternal and Child Health, IRCCS "Burlo Garofolo", Trieste, Italy
| | - Yan Gao
- Department of Physiology and Biophysics, The University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | | | - Daniel S Evans
- Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, 94158, USA
| | - Nathan Pankratz
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Sheila R Pratt
- Department of Communication Science & Disorders, University of Pittsburgh, 6035 Forbes Tower, Pittsburgh, PA, 15260, USA
| | - T Ryan Price
- Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD, 20892, USA
| | - Christopher Spankovich
- Department of Otolaryngology and Communicative Sciences, The University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | - Mary R Stimson
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Karen Valle
- Jackson Heart Study, 350 W. Woodrow Wilson Blvd, Suite 701, Jackson, MS, 39213, USA
| | - Dragana Vuckovic
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy
| | - Helena Wells
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | | | - Erik Fransen
- Center for Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, BE-2650, Edegem, Antwerp, Belgium
| | - Mohammad Arfan Ikram
- Department of Epidemiology, Erasmus Medical Center, 3015 CE, Rotterdam, The Netherlands
| | - Chuang-Ming Li
- Epidemiology and Statistics Program, Division of Scientific Programs, National Institute on Deafness and Other Communication Disorders (NIDCD) National Institutes of Health (NIH), Neuroscience Center Building, Suite 8300, 6001 Executive Blvd, Bethesda, MD, 20892, USA
| | - W T Longstreth
- Departments of Neurology and Epidemiology, University of Washington, Seattle, WA, 98195, USA
| | - Claire Steves
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - Guy Van Camp
- Center for Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, BE-2650, Edegem, Antwerp, Belgium
| | - Adolfo Correa
- Jackson Heart Study, 350 W. Woodrow Wilson Blvd, Suite 701, Jackson, MS, 39213, USA
| | - Karen J Cruickshanks
- Departments of Ophthalmology and Visual Sciences and Population Health Sciences, University of Wisconsin, Madison, WI, 53726, USA
| | - Paolo Gasparini
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy
| | - Giorgia Girotto
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy
| | - Robert C Kaplan
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Michael Nalls
- Data Tecnica International, Glen Echo, MD, 20812, USA
| | - John M Schweinfurth
- Department of Otolaryngology and Communicative Sciences, The University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | - Sudha Seshadri
- Glenn Biggs Institute for Alzheimer's & Neurodegenerative Diseases, UT Health, San Antonio, 78229, TX, USA
| | - Nona Sotoodehnia
- Cardiovascular Health Research Unit, University of Washington, Seattle, WA, 98195, USA
| | - Gregory J Tranah
- Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, 94158, USA
| | - André G Uitterlinden
- Department of Internal Medicine, Erasm us Medical Center, 3015 CE, Rotterdam, The Netherlands
| | - James G Wilson
- Department of Physiology and Biophysics, The University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | | | - Howard J Hoffman
- Epidemiology and Statistics Program, Division of Scientific Programs, National Institute on Deafness and Other Communication Disorders (NIDCD) National Institutes of Health (NIH), Neuroscience Center Building, Suite 8300, 6001 Executive Blvd, Bethesda, MD, 20892, USA
| | - Frances M K Williams
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - André Goedegebure
- Department of Otorhinolaryngology, Erasmus Medical Center, 3015 CE, Rotterdam, The Netherlands
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Guo J, Chai R, Li H, Sun S. Protection of Hair Cells from Ototoxic Drug-Induced Hearing Loss. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1130:17-36. [PMID: 30915699 DOI: 10.1007/978-981-13-6123-4_2] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Hair cells are specialized sensory epithelia cells that receive mechanical sound waves and convert them into neural signals for hearing, and these cells can be killed or damaged by ototoxic drugs, including many aminoglycoside antibiotics, platinum-based anticancer agents, and loop diuretics, leading to drug-induced hearing loss. Studies of therapeutic approaches to drug-induced hearing loss have been hampered by the limited understanding of the biological mechanisms that protect and regenerate hair cells. This review briefly discusses some of the most common ototoxic drugs and describes recent research concerning the mechanisms of ototoxic drug-induced hearing loss. It also highlights current developments in potential therapies and explores current clinical treatments for patients with hearing impairments.
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Affiliation(s)
- Jin Guo
- Key Laboratory of Hearing Medicine of NHFPC, ENT Institute and Otorhinolaryngology Department, Shanghai Engineering Research Centre of Cochlear Implant, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
| | - Renjie Chai
- Key Laboratory of Hearing Medicine of NHFPC, ENT Institute and Otorhinolaryngology Department, Shanghai Engineering Research Centre of Cochlear Implant, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China.,MOE Key Laboratory for Developmental Genes and Human Disease, Institute of Life Sciences, Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, Nanjing, China
| | - Huawei Li
- Key Laboratory of Hearing Medicine of NHFPC, ENT Institute and Otorhinolaryngology Department, Shanghai Engineering Research Centre of Cochlear Implant, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
| | - Shan Sun
- Key Laboratory of Hearing Medicine of NHFPC, ENT Institute and Otorhinolaryngology Department, Shanghai Engineering Research Centre of Cochlear Implant, Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China.
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8
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Alvarado JC, Fuentes-Santamaría V, Gabaldón-Ull MC, Juiz JM. An Oral Combination of Vitamins A, C, E, and Mg ++ Improves Auditory Thresholds in Age-Related Hearing Loss. Front Neurosci 2018; 12:527. [PMID: 30108480 PMCID: PMC6079267 DOI: 10.3389/fnins.2018.00527] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 07/13/2018] [Indexed: 12/02/2022] Open
Abstract
The increasing rate of age-related hearing loss (ARHL), with its subsequent reduction in quality of life and increase in health care costs, requires new therapeutic strategies to reduce and delay its impact. The goal of this study was to determine if ARHL could be reduced in a rat model by administering a combination of antioxidant vitamins A, C, and E acting as free radical scavengers along with Mg++, a known powerful cochlear vasodilator (ACEMg). Toward this goal, young adult, 3 month-old Wistar rats were divided into two groups: one was fed with a diet composed of regular chow (“normal diet,” ND); the other received a diet based on chow enriched in ACEMg (“enhanced diet,” ED). The ED feeding began 10 days before the noise stimulation. Auditory brainstem recordings (ABR) were performed at 0.5, 1, 2, 4, 8, 16, and 32 kHz at 3, 6–8, and 12–14 months of age. No differences were observed at 3 months of age, in both ND and ED animals. At 6–8 and 12–14 months of age there were significant increases in auditory thresholds and a reduction in the wave amplitudes at all frequencies tested, compatible with progressive development of ARHL. However, at 6–8 months threshold shifts in ED rats were significantly lower in low and medium frequencies, and wave amplitudes were significantly larger at all frequencies when compared to ND rats. In the oldest animals, differences in the threshold shift persisted, as well as in the amplitude of the wave II, suggesting a protective effect of ACEMg on auditory function during aging. These findings indicate that oral ACEMg may provide an effective adjuvant therapeutic intervention for the treatment of ARHL, delaying the progression of hearing impairment associated with age.
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Affiliation(s)
- Juan C Alvarado
- Instituto de Investigación en Discapacidades Neurológicas, Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - Verónica Fuentes-Santamaría
- Instituto de Investigación en Discapacidades Neurológicas, Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - María C Gabaldón-Ull
- Instituto de Investigación en Discapacidades Neurológicas, Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - José M Juiz
- Instituto de Investigación en Discapacidades Neurológicas, Facultad de Medicina, Universidad de Castilla-La Mancha, Albacete, Spain
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9
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Fitzakerley JL, Trachte GJ. Genetics of guanylyl cyclase pathways in the cochlea and their influence on hearing. Physiol Genomics 2018; 50:780-806. [PMID: 29958079 DOI: 10.1152/physiolgenomics.00056.2018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Although hearing loss is the most common sensory deficit in Western societies, there are no successful pharmacological treatments for this disorder. Recent experiments have demonstrated that manipulation of intracellular cyclic guanosine monophosphate (cGMP) concentrations can have both beneficial and harmful effects on hearing. In this review, we will examine the role of cGMP as a key second messenger involved in many aspects of cochlear function and discuss the known functions of downstream effectors of cGMP in sound processing. The nitric oxide-stimulated soluble guanylyl cyclase system (sGC) and the two natriuretic peptide-stimulated particulate GCs (pGCs) will be more extensively covered because they have been studied most thoroughly. The cochlear GC systems are attractive targets for medical interventions that improve hearing while simultaneously representing an under investigated source of sensorineural hearing loss.
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Affiliation(s)
- Janet L Fitzakerley
- Department of Biomedical Sciences, University of Minnesota Medical School , Duluth, Minnesota
| | - George J Trachte
- Department of Biomedical Sciences, University of Minnesota Medical School , Duluth, Minnesota
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Partearroyo T, Vallecillo N, Pajares MA, Varela-Moreiras G, Varela-Nieto I. Cochlear Homocysteine Metabolism at the Crossroad of Nutrition and Sensorineural Hearing Loss. Front Mol Neurosci 2017; 10:107. [PMID: 28487633 PMCID: PMC5403919 DOI: 10.3389/fnmol.2017.00107] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 03/30/2017] [Indexed: 12/27/2022] Open
Abstract
Hearing loss (HL) is one of the most common causes of disability, affecting 360 million people according to the World Health Organization (WHO). HL is most frequently of sensorineural origin, being caused by the irreversible loss of hair cells and/or spiral ganglion neurons. The etiology of sensorineural HL (SNHL) is multifactorial, with genetic and environmental factors such as noise, ototoxic substances and aging playing a role. The nutritional status is central in aging disability, but the interplay between nutrition and SNHL has only recently gained attention. Dietary supplementation could therefore constitute the first step for the prevention and potential repair of hearing damage before it reaches irreversibility. In this context, different epidemiological studies have shown correlations among the nutritional condition, increased total plasma homocysteine (tHcy) and SNHL. Several human genetic rare diseases are also associated with homocysteine (Hcy) metabolism and SNHL confirming this potential link. Accordingly, rodent experimental models have provided the molecular basis to understand the observed effects. Thus, increased tHcy levels and vitamin deficiencies, such as folic acid (FA), have been linked with SNHL, whereas long-term dietary supplementation with omega-3 fatty acids improved Hcy metabolism, cell survival and hearing acuity. Furthermore, pharmacological supplementations with the anti-oxidant fumaric acid that targets Hcy metabolism also improved SNHL. Overall these results strongly suggest that cochlear Hcy metabolism is a key player in the onset and progression of SNHL, opening the way for the design of prospective nutritional therapies.
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Affiliation(s)
- Teresa Partearroyo
- Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San PabloMadrid, Spain
| | - Néstor Vallecillo
- Departamento de Fisiopatología y del Sistema Nervios, Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas (CSIC-UAM)Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos IIIMadrid, Spain
| | - María A Pajares
- Departamento de Fisiopatología y del Sistema Nervios, Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas (CSIC-UAM)Madrid, Spain.,Investigación en Otoneurocirugía, Instituto de Investigación Sanitaria La Paz (IdiPAZ)Madrid, Spain
| | - Gregorio Varela-Moreiras
- Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San PabloMadrid, Spain
| | - Isabel Varela-Nieto
- Departamento de Fisiopatología y del Sistema Nervios, Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas (CSIC-UAM)Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos IIIMadrid, Spain.,Investigación en Otoneurocirugía, Instituto de Investigación Sanitaria La Paz (IdiPAZ)Madrid, Spain
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11
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Auditory stimulation modulates CXCL12/CXCR4 expression in postnatal development of the newborn rat cochlea. Neuroreport 2016; 26:681-7. [PMID: 26164455 DOI: 10.1097/wnr.0000000000000408] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Sensorineural hearing loss is one of the most common sensory deficits. Recently, inner-ear stem cell therapy has been proposed for auditory afferent rehabilitation. CXCR4 is the primary physiologic receptor for CXC chemokine ligand 12 (CXCL12) and the CXCL12-CXCR4 pathway has been implicated in the process of migration, differentiation, and maturation of vertebrate neural stem cells. In this study, we examined changes in the auditory brainstem response and CXCL12/CXCR4 expression in newborn rat cochleae under different acoustic environments by quantitative real-time PCR, western blot, enzyme-linked immunosorbent assay, immunohistochemistry, and immunofluorescence analyses. Rats were divided randomly into three groups: the augmented acoustic environment (AAE) group, the auditory deprivation (AD) group, and the control group. Auditory brainstem response thresholds were markedly increased in the AAE group and in the AD group. Compared with postnatal day 1, the expression of CXCL12/CXCR4 mRNA and protein under normal acoustic conditions was increased on postnatal day 14 and then decreased on postnatal day 28 in the cochlea. However, on postnatal day 28, CXCL12/CXCR4 expression, as well as its spatiotemporal distribution as detected by immunohistochemistry and immunofluorescence assays, was augmented by AAE treatment and inhibited by AD treatment. Therefore, our results confirmed that auditory stimulation influenced the spatiotemporal expression of CXCL12/CXCR4 in newborn rat cochlea, which might help to unravel the role of the CXCL12-CXCR4 pathway in the synaptic contacts and hearing function establishment in rat cochlea development.
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12
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Alvarado JC, Fuentes-Santamaría V, Melgar-Rojas P, Valero ML, Gabaldón-Ull MC, Miller JM, Juiz JM. Synergistic effects of free radical scavengers and cochlear vasodilators: a new otoprotective strategy for age-related hearing loss. Front Aging Neurosci 2015; 7:86. [PMID: 26029103 PMCID: PMC4432684 DOI: 10.3389/fnagi.2015.00086] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 04/30/2015] [Indexed: 01/08/2023] Open
Abstract
The growing increase in age-related hearing loss (ARHL), with its dramatic reduction in quality of life and significant increase in health care costs, is a catalyst to develop new therapeutic strategies to prevent or reduce this aging-associated condition. In this regard, there is extensive evidence that excessive free radical formation along with diminished cochlear blood flow are essential factors involved in mechanisms of other stress-related hearing loss, such as that associated with noise or ototoxic drug exposure. The emerging view is that both play key roles in ARHL pathogenesis. Therapeutic targeting of excessive free radical formation and cochlear blood flow regulation may be a useful strategy to prevent onset of ARHL. Supporting this idea, micronutrient-based therapies, in particular those combining antioxidants and vasodilators like magnesium (Mg2+), have proven effective in reducing the impact of noise and ototoxic drugs in the inner ear, therefore improving auditory function. In this review, the synergistic effects of combinations of antioxidant free radicals scavengers and cochlear vasodilators will be discussed as a feasible therapeutic approach for the treatment of ARHL.
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Affiliation(s)
- Juan Carlos Alvarado
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
| | - Verónica Fuentes-Santamaría
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
| | - Pedro Melgar-Rojas
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
| | - María Llanos Valero
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
| | - María Cruz Gabaldón-Ull
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
| | - Josef M Miller
- Karolinska Institutet Stockholm, Sweden ; Kresge Hearing Research Institute, University of Michigan Ann Arbor, MI, USA
| | - José M Juiz
- Facultad de Medicina, Universidad de Castilla-La Mancha, Instituto de Investigación en Discapacidades Neurológicas (IDINE) Albacete, Spain
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13
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Noise alters guinea pig's blood-labyrinth barrier ultrastructure and permeability along with a decrease of cochlear Claudin-5 and Occludin. BMC Neurosci 2014; 15:136. [PMID: 25539640 PMCID: PMC4299297 DOI: 10.1186/s12868-014-0136-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 12/11/2014] [Indexed: 01/25/2023] Open
Abstract
Background Noise exposure (NE) is a severe modern health hazard that induces hearing impairment. However, the noise-induced ultrastructural changes of blood-labyrinth barrier (BLB) and the potential involvements of tight junction proteins (TJP) remain inconclusive. We investigated the effects of NE on not only the ultrastructure of cochlea and permeability of BLB but also the expression of TJP within the guinea pig cochlea. Results Male albino guinea pigs were exposed to white noise for 4 h or 2 consecutive days (115 dB sound pressure level, 6 hours per day) and the hearing impairments and light microscopic change of BLB were evaluated with auditory brainstem responses (ABR) and the cochlear sensory epithelia surface preparation, respectively. The cochlear ultrastructure and BLB permeability after NE 2d were revealed with transmission electron microscope (TEM) and lanthanum nitrate-tracing techniques, respectively. The potential alterations of TJPs Claudin-5 and Occludin were quantified with immunohistochemistry and western blot. NE induced significant hearing impairment and NE 2d contributed to significant outer hair cell (OHC) loss that is most severe in the first row of outer hair cells. Furthermore, the loosen TJ and an obvious leakage of lanthanum nitrate particles beneath the basal lamina were revealed with TEM. Moreover, a dose-dependent decrease of Claudin-5 and Occludin was observed in the cochlea after NE. Conclusions All these findings suggest that both decrease of Claudin-5 and Occludin and increased BLB permeability are involved in the pathologic process of noise-induced hearing impairment; however, the causal relationship and underlying mechanisms should be further investigated. Electronic supplementary material The online version of this article (doi:10.1186/s12868-014-0136-0) contains supplementary material, which is available to authorized users.
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14
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Martínez-Vega R, Garrido F, Partearroyo T, Cediel R, Zeisel SH, Martínez-Álvarez C, Varela-Moreiras G, Varela-Nieto I, Pajares MA. Folic acid deficiency induces premature hearing loss through mechanisms involving cochlear oxidative stress and impairment of homocysteine metabolism. FASEB J 2014; 29:418-32. [PMID: 25384423 DOI: 10.1096/fj.14-259283] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Nutritional imbalance is emerging as a causative factor of hearing loss. Epidemiologic studies have linked hearing loss to elevated plasma total homocysteine (tHcy) and folate deficiency, and have shown that folate supplementation lowers tHcy levels potentially ameliorating age-related hearing loss. The purpose of this study was to address the impact of folate deficiency on hearing loss and to examine the underlying mechanisms. For this purpose, 2-mo-old C57BL/6J mice (Animalia Chordata Mus musculus) were randomly divided into 2 groups (n = 65 each) that were fed folate-deficient (FD) or standard diets for 8 wk. HPLC analysis demonstrated a 7-fold decline in serum folate and a 3-fold increase in tHcy levels. FD mice exhibited severe hearing loss measured by auditory brainstem recordings and TUNEL-positive-apoptotic cochlear cells. RT-quantitative PCR and Western blotting showed reduced levels of enzymes catalyzing homocysteine (Hcy) production and recycling, together with a 30% increase in protein homocysteinylation. Redox stress was demonstrated by decreased expression of catalase, glutathione peroxidase 4, and glutathione synthetase genes, increased levels of manganese superoxide dismutase, and NADPH oxidase-complex adaptor cytochrome b-245, α-polypeptide (p22phox) proteins, and elevated concentrations of glutathione species. Altogether, our findings demonstrate, for the first time, that the relationship between hyperhomocysteinemia induced by folate deficiency and premature hearing loss involves impairment of cochlear Hcy metabolism and associated oxidative stress.
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Affiliation(s)
- Raquel Martínez-Vega
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Francisco Garrido
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Teresa Partearroyo
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Rafael Cediel
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Steven H Zeisel
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Concepción Martínez-Álvarez
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Gregorio Varela-Moreiras
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - Isabel Varela-Nieto
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
| | - María A Pajares
- *Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Madrid, Spain; Unidad 761, Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain; Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad CEU San Pablo, Boadilla del Monte, Madrid, Spain; Hospital Clínico Veterinario, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain; University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, North Carolina, USA; Departamento de Anatomía y Embriología Humana I, Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain; and Instituto de Investigación Sanitaria La Paz, Madrid, Spain
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Zhang PZ, Cao XS, Jiang XW, Wang J, Liang PF, Wang SJ, Mi WJ, Chen FQ, Chen Y, Xue T, Chen J, Qiu JH. Acoustical stimulus changes the expression of stromal cell-derived factor-1 in the spiral ganglion neurons of the rat cochlea. Neurosci Lett 2014; 561:140-5. [PMID: 24394908 DOI: 10.1016/j.neulet.2013.12.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 12/16/2013] [Accepted: 12/27/2013] [Indexed: 11/24/2022]
Abstract
Neural stem cell (NSC) transplantation into the cochlea has been tested as a treatment for spiral ganglion neuron (SGN) degenerative disease and injury in various animal models. A recent study has shown evidence of functional recovery after transplantation of the stem cells into a degenerated-SGN model. Chemokine stromal cell-derived factor-1 (SDF-1, or known as CXC chemokine ligand-12, CXCL-12) signaling through CXCR4 has previously been identified as a key step in the homing of the stem cells within the injury areas; meanwhile, studies have revealed that the SDF-1/CXCR4 axis is also involved in axon guidance and pathfinding. A study found that transplanted neural precursor cells can migrate to the root of the auditory nerve when animals are subjected to an augmented acoustic environment (AAE). In accordance with these studies, we hypothesize that AAE will up-regulate the expression of SDF-1 in acoustic nerves. We tested our hypothesis by examining the expression of SDF-1 in different acoustic environments, and the results were confirmed by the auditory brainstem response (ABR), immunohistochemical and RT-PCR analyses. The results showed that SDF-1 was expressed at a relatively low level in the SGNs under normal animal unit acoustic conditions (40-50 dB). Moreover, it was significantly up-regulated in the SGNs under the 75 dB (augmented physiological process without hearing loss) and 90 dB AAE (pathological process with light hearing loss) conditions; however, under the 115 dB AAE (pathological process with severe hearing loss) condition, the expression of SDF-1 was not up-regulated. The results confirmed that appropriately augmented acoustical stimuli lead to the up-regulation of SDF-1, which may assist in the migration of the transplanted cells and the subsequent establishment of essential synaptic contacts between the exogenous cells and the host auditory pathway.
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Affiliation(s)
- Peng-zhi Zhang
- Ji-Guan Hospital, Lanzhou Military Region, Air Force, PLA, Lanzhou 730020, China; Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Xin-sheng Cao
- Department of Aerospace Biodynamics, Faculty of Aerospace Medicine, Fourth Military Medical University, Xi'an 710032, China
| | - Xing-wang Jiang
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jie Wang
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Peng-fei Liang
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Shu-juan Wang
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Wen-juan Mi
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Fu-quan Chen
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Yang Chen
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Tao Xue
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jun Chen
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jian-hua Qiu
- Department of Otolaryngology-Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
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Zhang PZ, He Y, Jiang XW, Chen FQ, Chen Y, Shi L, Chen J, Chen X, Li X, Xue T, Wang Y, Mi WJ, Qiu JH. Stem cell transplantation via the cochlear lateral wall for replacement of degenerated spiral ganglion neurons. Hear Res 2013; 298:1-9. [DOI: 10.1016/j.heares.2013.01.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 01/29/2013] [Accepted: 01/31/2013] [Indexed: 01/11/2023]
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