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Chen X, Zheng Z, Xie D, Xia L, Chen Y, Dong H, Feng Y. Serum lipid metabolism characteristics and potential biomarkers in patients with unilateral sudden sensorineural hearing loss. Lipids Health Dis 2024; 23:205. [PMID: 38951804 PMCID: PMC11218322 DOI: 10.1186/s12944-024-02189-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 06/16/2024] [Indexed: 07/03/2024] Open
Abstract
BACKGROUND Glycerophospholipids (GPLs) are essential for cell membrane structure and function. Sphingomyelin and its metabolites regulate cell growth, apoptosis, and stress responses. This study aimed to investigate lipid metabolism in patients experiencing sudden sensorineural hearing loss across all frequencies (AF-SSNHL). METHODS The study included 60 patients diagnosed with unilateral AF-SSNHL, among whom 30 patients had a level of hearing improvement ≥ 15 dB after 6 months of follow-up. A propensity score-matched (2:1) control group was used. Liquid chromatography‒mass spectrometry based untargeted lipidomics analysis combined with multivariate statistics was performed to investigate the lipids change. The "lipidome" R package and weighted gene co-expression network analysis (WGCNA) were utilised to assess the lipids' structural features and the association between lipids and hearing. RESULTS Lipidomics successfully differentiated the AF-SSNHL group from the control group, identifying 17 risk factors, mainly including phosphatidylcholine (PC), phosphatidylethanolamine (PE), and related metabolites. The ratios of lysophosphatidylcholine/PC, lysophosphatidylethanolamine/PE, and lysodimethylphosphatidylethanolamine/PE were upregulated, while some glycerophospholipid (GPL)-plasmalogens were downregulated in the AF-SSNHL group, indicating abnormal metabolism of GPLs. Trihexosylceramide (d34:1), PE (18:1e_22:5), and sphingomyelin (d40:3) were significantly different between responders and nonresponders, and positively correlated with hearing improvement. Additionally, the results of the WGCNA also suggested that partial GPL-plasmalogens were positively associated with hearing improvement. CONCLUSION AF-SSNHL patients exhibited abnormally high blood lipids and pronounced GPLs metabolic abnormalities. Sphingolipids and GPL-plasmalogens had an association with the level of hearing improvement. By understanding the lipid changes, clinicians may be able to predict the prognosis of hearing recovery and personalize treatment approaches.
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Affiliation(s)
- Xiaoyan Chen
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University School of Medicine Affiliated Sixth People's Hospital, 600 Yishan Road, Xuhui District, Shanghai, China
- Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Zhong Zheng
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University School of Medicine Affiliated Sixth People's Hospital, 600 Yishan Road, Xuhui District, Shanghai, China
- Department of Otolaryngology Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Daoyu Xie
- Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang Province, China
| | - Liang Xia
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University School of Medicine Affiliated Sixth People's Hospital, 600 Yishan Road, Xuhui District, Shanghai, China
- Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Yi Chen
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University School of Medicine Affiliated Sixth People's Hospital, 600 Yishan Road, Xuhui District, Shanghai, China
- Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China
| | - Hongjun Dong
- Department of Otolaryngology-Head and Neck Surgery, Zhangjiagang TCM Hospital, Affiliated to Nanjing University of Chinese Medicine, Zhangjiagang, Jiangsu Province, China.
| | - Yanmei Feng
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Jiao Tong University School of Medicine Affiliated Sixth People's Hospital, 600 Yishan Road, Xuhui District, Shanghai, China.
- Shanghai Key Laboratory of Sleep Disordered Breathing, Shanghai, China.
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Jan TA, Eltawil Y, Ling AH, Chen L, Ellwanger DC, Heller S, Cheng AG. Spatiotemporal dynamics of inner ear sensory and non-sensory cells revealed by single-cell transcriptomics. Cell Rep 2021; 36:109358. [PMID: 34260939 PMCID: PMC8378666 DOI: 10.1016/j.celrep.2021.109358] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 12/25/2020] [Accepted: 06/17/2021] [Indexed: 11/28/2022] Open
Abstract
The utricle is a vestibular sensory organ that requires mechanosensitive hair cells to detect linear acceleration. In neonatal mice, new hair cells are derived from non-sensory supporting cells, yet cell type diversity and mechanisms of cell addition remain poorly characterized. Here, we perform computational analyses on single-cell transcriptomes to categorize cell types and resolve 14 individual sensory and non-sensory subtypes. Along the periphery of the sensory epithelium, we uncover distinct groups of transitional epithelial cells, marked by Islr, Cnmd, and Enpep expression. By reconstructing de novo trajectories and gene dynamics, we show that as the utricle expands, Islr+ transitional epithelial cells exhibit a dynamic and proliferative phase to generate new supporting cells, followed by coordinated differentiation into hair cells. Taken together, our study reveals a sequential and coordinated process by which non-sensory epithelial cells contribute to growth of the postnatal mouse sensory epithelium. The postnatal mouse utricle expands by more than 35% and doubles its number of hair cells during the first 8 days. Using single-cell transcriptomics, Jan et al. show that the surrounding transitional epithelial cells proliferate and contribute to the expansion of the sensory epithelium through a stepwise differentiation mechanism.
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Affiliation(s)
- Taha A Jan
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA; Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, CA 94115, USA
| | - Yasmin Eltawil
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA
| | - Angela H Ling
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA; Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, CA 94115, USA
| | - Leon Chen
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA
| | - Daniel C Ellwanger
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA; Genome Analysis Unit, Amgen Research, Amgen Inc., South San Francisco, CA 94080, USA
| | - Stefan Heller
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA.
| | - Alan G Cheng
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, CA 94305, USA.
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Wang H, Lin C, Yao J, Shi H, Zhang C, Wei Q, Lu Y, Chen Z, Xing G, Cao X. Deletion of OSBPL2 in auditory cells increases cholesterol biosynthesis and drives reactive oxygen species production by inhibiting AMPK activity. Cell Death Dis 2019; 10:627. [PMID: 31427568 PMCID: PMC6700064 DOI: 10.1038/s41419-019-1858-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 07/25/2019] [Accepted: 07/30/2019] [Indexed: 02/07/2023]
Abstract
Oxysterol-binding protein like 2 (OSBPL2) was identified as a novel causal gene for autosomal dominant nonsyndromic hearing loss. However, the pathogenesis of OSBPL2 deficits in ADNSHL was still unclear. The function of OSBPL2 as a lipid-sensing regulator in multiple cellular processes suggested that OSBPL2 might play an important role in the regulation of cholesterol-homeostasis, which was essential for inner ear. In this study the potential roles of OSBPL2 in cholesterol biosynthesis and ROS production were investigated in Osbpl2-KO OC1 cells and osbpl2b-KO zebrafish. RNA-seq-based analysis suggested that OSBPL2 was implicated in cholesterol biosynthesis and AMPK signaling pathway. Furthermore, Osbpl2/osbpl2b-KO resulted in a reduction of AMPK activity and up-regulation of Srebp2/srebp2, Hmgcr/hmgcr and Hmgcs1/hmgcs1, key genes in the sterol biosynthetic pathway and associated with AMPK signaling. In addition, OSBPL2 was also found to interact with ATIC, key activator of AMPK. The levels of total cholesterol and ROS in OC1 cells or zebrafish inner ear were both increased in Osbpl2/osbpl2b-KO mutants and the mitochondrial damage was detected in Osbpl2-KO OC1 cells. This study uncovered the regulatory roles of OSBPL2 in cellular cholesterol biosynthesis and ROS production. These founds might contribute to the deep understanding of the pathogenesis of OSBPL2 mutation in ADNSHL.
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Affiliation(s)
- Hongshun Wang
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Changsong Lin
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Jun Yao
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China.,Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing, China
| | - Hairong Shi
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Cui Zhang
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Qinjun Wei
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China.,Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing, China.,The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Yajie Lu
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China.,Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing, China
| | - Zhibin Chen
- Department of Otolaryngology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Guangqian Xing
- Department of Otolaryngology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Xin Cao
- Department of Medical Genetics, School of Basic Medical Science, Nanjing Medical University, Nanjing, China. .,Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing, China. .,The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China.
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Ghelfi E, Grondin Y, Millet EJ, Bartos A, Bortoni M, Oliveira Gomes Dos Santos C, Trevino-Villarreal HJ, Sepulveda R, Rogers R. In vitro gentamicin exposure alters caveolae protein profile in cochlear spiral ligament pericytes. Proteome Sci 2018; 16:7. [PMID: 29760588 PMCID: PMC5938607 DOI: 10.1186/s12953-018-0132-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 02/04/2018] [Indexed: 12/20/2022] Open
Abstract
Background The aminoglycoside antibiotic gentamicin is an ototoxic drug and has been used experimentally to investigate cochlear damage induced by noise.We have investigated the changes in the protein profile associated with caveolae in gentamicin treated and untreated spiral ligament (SL) pericytes, specialized cells in the blood labyrinth barrier of the inner ear microvasculature. Pericytes from various microvascular beds express caveolae, protein and cholesterol rich microdomains, which can undergo endocytosis and transcytosis to transport small molecules in and out the cells. A different protein profile in transport-specialized caveolae may induce pathological changes affecting the integrity of the blood labyrinth barrier and ultimately contributing to hearing loss. Method Caveolae isolation from treated and untreated cells is achieved through ultracentrifugation of the lysates in discontinuous gradients. Mass spectrometry (LC-MS/MS) analysis identifies the proteins in the two groups. Proteins segregating with caveolae isolated from untreated SL pericytes are then compared to caveolae isolated from SL pericytes treated with the gentamicin for 24 h. Data are analyzed using bioinformatic tools. Results The caveolae proteome in gentamicin treated cells shows that 40% of total proteins are uniquely associated with caveolae during the treatment, and 15% of the proteins normally associated with caveolae in untreated cell are suppressed. Bioinformatic analysis of the data shows a decreased expression of proteins involved in genetic information processing, and an increase in proteins involved in metabolism, vesicular transport and signal transduction in gentamicin treated cells. Several Rab GTPases proteins, ubiquitous transporters, uniquely segregate with caveolae and are significantly enriched in gentamicin treated cells. Conclusion We report that gentamicin exposure modifies protein profile of caveolae from SL pericytes. We identified a pool of proteins which are uniquely segregating with caveolae during the treatment, mainly participating in metabolic and biosynthetic pathways, in transport pathways and in genetic information processing. Finally, we show for the first time proteins associated with caveolae SL pericytes linked to nonsyndromic hearing loss.
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Affiliation(s)
- Elisa Ghelfi
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
| | - Yohann Grondin
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
| | - Emil J Millet
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
| | - Adam Bartos
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
| | - Magda Bortoni
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
| | - Clara Oliveira Gomes Dos Santos
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA.,2Universidade de Sao Paulo, Faculdade de Medicina, Sao Paulo, Brazil
| | | | - Rosalinda Sepulveda
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA.,4Universidad Autónoma de Nuevo León, Facultad de Medicina, Monterrey, Mexico
| | - Rick Rogers
- 1Harvard T.H. Chan School of Public Health, Department of Environmental Health, MIPS Program, Boston, MA USA
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5
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Requena T, Gallego-Martinez A, Lopez-Escamez JA. Bioinformatic Integration of Molecular Networks and Major Pathways Involved in Mice Cochlear and Vestibular Supporting Cells. Front Mol Neurosci 2018; 11:108. [PMID: 29674954 PMCID: PMC5895758 DOI: 10.3389/fnmol.2018.00108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 03/19/2018] [Indexed: 12/18/2022] Open
Abstract
Background: Cochlear and vestibular epithelial non-hair cells (ENHCs) are the supporting elements of the cellular architecture in the organ of Corti and the vestibular neuroepithelium in the inner ear. Intercellular and cell-extracellular matrix interactions are essential to prevent an abnormal ion redistribution leading to hearing and vestibular loss. The aim of this study is to define the main pathways and molecular networks in the mouse ENHCs. Methods: We retrieved microarray and RNA-seq datasets from mouse epithelial sensory and non-sensory cells from gEAR portal (http://umgear.org/index.html) and obtained gene expression fold-change between ENHCs and non-epithelial cells (NECs) against HCs for each gene. Differentially expressed genes (DEG) with a log2 fold change between 1 and -1 were discarded. The remaining genes were selected to search for interactions using Ingenuity Pathway Analysis and STRING platform. Specific molecular networks for ENHCs in the cochlea and the vestibular organs were generated and significant pathways were identified. Results: Between 1723 and 1559 DEG were found in the mouse cochlear and vestibular tissues, respectively. Six main pathways showed enrichment in the supporting cells in both tissues: (1) "Inhibition of Matrix Metalloproteases"; (2) "Calcium Transport I"; (3) "Calcium Signaling"; (4) "Leukocyte Extravasation Signaling"; (5) "Signaling by Rho Family GTPases"; and (6) "Axonal Guidance Si". In the mouse cochlea, ENHCs showed a significant enrichment in 18 pathways highlighting "axonal guidance signaling (AGS)" (p = 4.37 × 10-8) and "RhoGDI Signaling" (p = 3.31 × 10-8). In the vestibular dataset, there were 20 enriched pathways in ENHCs, the most significant being "Leukocyte Extravasation Signaling" (p = 8.71 × 10-6), "Signaling by Rho Family GTPases" (p = 1.20 × 10-5) and "Calcium Signaling" (p = 1.20 × 10-5). Among the top ranked networks, the most biologically significant network contained the "auditory and vestibular system development and function" terms. We also found 108 genes showing tonotopic gene expression in the cochlear ENHCs. Conclusions: We have predicted the main pathways and molecular networks for ENHCs in the organ of Corti and vestibular neuroepithelium. These pathways will facilitate the design of molecular maps to select novel candidate genes for hearing or vestibular loss to conduct functional studies.
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Affiliation(s)
- Teresa Requena
- Otology & Neurotology Group CTS495, Department of Genomic Medicine-Centro de Genómica e Investigación Oncológica-Pfizer/Universidad de Granada/Junta de Andalucía (GENYO), Granada, Spain
| | - Alvaro Gallego-Martinez
- Otology & Neurotology Group CTS495, Department of Genomic Medicine-Centro de Genómica e Investigación Oncológica-Pfizer/Universidad de Granada/Junta de Andalucía (GENYO), Granada, Spain
| | - Jose A Lopez-Escamez
- Otology & Neurotology Group CTS495, Department of Genomic Medicine-Centro de Genómica e Investigación Oncológica-Pfizer/Universidad de Granada/Junta de Andalucía (GENYO), Granada, Spain.,Department of Otolaryngology, Instituto de Investigación Biosanitaria, ibs.GRANADA, Hospital Virgen de las Nieves, Universidad de Granada, Granada, Spain.,Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg
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Taylor KC, Sanders CR. Regulation of KCNQ/Kv7 family voltage-gated K + channels by lipids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1859:586-597. [PMID: 27818172 DOI: 10.1016/j.bbamem.2016.10.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 10/24/2016] [Accepted: 10/31/2016] [Indexed: 12/19/2022]
Abstract
Many years of studies have established that lipids can impact membrane protein structure and function through bulk membrane effects, by direct but transient annular interactions with the bilayer-exposed surface of protein transmembrane domains, and by specific binding to protein sites. Here, we focus on how phosphatidylinositol 4,5-bisphosphate (PIP2) and polyunsaturated fatty acids (PUFAs) impact ion channel function and how the structural details of the interactions of these lipids with ion channels are beginning to emerge. We focus on the Kv7 (KCNQ) subfamily of voltage-gated K+ channels, which are regulated by both PIP2 and PUFAs and play a variety of important roles in human health and disease. This article is part of a Special Issue entitled: Lipid order/lipid defects and lipid-control of protein activity edited by Dirk Schneider.
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Affiliation(s)
- Keenan C Taylor
- Department of Biochemistry, Vanderbilt University, Nashville, TN, USA; Center for Structural Biology, Vanderbilt University, Nashville, TN, USA
| | - Charles R Sanders
- Department of Biochemistry, Vanderbilt University, Nashville, TN, USA; Center for Structural Biology, Vanderbilt University, Nashville, TN, USA; Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
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7
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Watanabe H, Cardoso L, Lalwani AK, Kysar JW. A dual wedge microneedle for sampling of perilymph solution via round window membrane. Biomed Microdevices 2016; 18:24. [PMID: 26888440 DOI: 10.1007/s10544-016-0046-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Precision medicine for inner-ear disease is hampered by the absence of a methodology to sample inner-ear fluid atraumatically. The round window membrane (RWM) is an attractive portal for accessing cochlear fluids as it heals spontaneously. In this study, we report on the development of a microneedle for perilymph sampling that minimizes the size of RWM perforation, facilitates quick aspiration, and provides precise volume control. Here, considering the mechanical anisotropy of the RWM and hydrodynamics through a microneedle, a 31G stainless steel pipe was machined into wedge-shaped design via electrical discharge machining. The sharpness of the needle was evaluated via a surface profilometer. Guinea pig RWM was penetrated in vitro, and 1 μL of perilymph was sampled and analyzed via UV-vis spectroscopy. The prototype wedge shaped needle was successfully fabricated with the tip curvature of 4.5 μm and the surface roughness of 3.66 μm in root mean square. The needle created oval perforation with minor and major diameter of 143 and 344 μm (n = 6). The sampling duration and standard deviation of aspirated volume were 3 s and 6.8 % respectively. The protein concentration was 1.74 mg/mL. The prototype needle facilitated precise perforation of RWMs and rapid aspiration of cochlear fluid with precise volume control. The needle design is promising and requires testing in human cadaveric temporal bone and further optimization to become clinically viable.
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Affiliation(s)
- Hirobumi Watanabe
- Department of Mechanical Engineering, Columbia University, 220 Mudd Building 500 West 120th Street, New York, NY, 10027, USA.
| | - Luis Cardoso
- Department of Biomedical Engineering, The City College of The University of New York, New York, NY, 10031, USA
| | - Anil K Lalwani
- Department of Otolaryngology - Head and Neck Surgery, Columbia University College of Physicians and Surgeons, New York, NY, 10032, USA
| | - Jeffrey W Kysar
- Department of Mechanical Engineering, Columbia University, 220 Mudd Building 500 West 120th Street, New York, NY, 10027, USA
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Szklanna PB, Foy M, Wynne K, Byrne D, Maguire PB. Analysis of the proteins associated with platelet detergent resistant membranes. Proteomics 2016; 16:2345-50. [DOI: 10.1002/pmic.201500309] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 06/02/2016] [Accepted: 06/16/2016] [Indexed: 12/28/2022]
Affiliation(s)
- Paulina B. Szklanna
- UCD Conway Institute, School of Biomolecular and Biomedical Science; University College Dublin; Dublin Ireland
| | - Martina Foy
- UCD Conway Institute, School of Biomolecular and Biomedical Science; University College Dublin; Dublin Ireland
| | - Kieran Wynne
- UCD Conway Institute, School of Biomolecular and Biomedical Science; University College Dublin; Dublin Ireland
| | - Dwayne Byrne
- UCD Conway Institute, School of Biomolecular and Biomedical Science; University College Dublin; Dublin Ireland
| | - Patricia B. Maguire
- UCD Conway Institute, School of Biomolecular and Biomedical Science; University College Dublin; Dublin Ireland
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Alawieh A, Mondello S, Kobeissy F, Shibbani K, Bassim M. Proteomics studies in inner ear disorders: pathophysiology and biomarkers. Expert Rev Proteomics 2015; 12:185-96. [PMID: 25795149 DOI: 10.1586/14789450.2015.1024228] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Although proteomics has been exploited in a wide range of diseases for identification of biomarkers and pathophysiological mechanisms, there are still biomedical disciplines such as otology where proteomics platforms are underused due to technical challenges and/or complex features of the disease. Thus, in the past few years, healthcare and scientific agencies have advocated the development and adoption of proteomic technologies in otological research. However, few studies have been conducted and limited literature is available in this area. Here, we present the state of the art of proteomics in otology, discussing the substantial evidence from recent experimental models and clinical studies in inner-ear conditions. We also delineate a series of critical issues including minute size of the inner ear, delicacy and poor accessibility of tissue that researchers face while undertaking otology proteomics research. Furthermore, we provide perspective to enhance the impact and lead to the clinical implementation of these proteomics-based strategies.
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Affiliation(s)
- Ali Alawieh
- Department of Neurosciences, Medical University of South Carolina, Charleston, SC 29425, USA
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10
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Yamashita T, Hakizimana P, Wu S, Hassan A, Jacob S, Temirov J, Fang J, Mellado-Lagarde M, Gursky R, Horner L, Leibiger B, Leijon S, Centonze VE, Berggren PO, Frase S, Auer M, Brownell WE, Fridberger A, Zuo J. Outer Hair Cell Lateral Wall Structure Constrains the Mobility of Plasma Membrane Proteins. PLoS Genet 2015; 11:e1005500. [PMID: 26352669 PMCID: PMC4564264 DOI: 10.1371/journal.pgen.1005500] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 08/14/2015] [Indexed: 12/02/2022] Open
Abstract
Nature’s fastest motors are the cochlear outer hair cells (OHCs). These sensory cells use a membrane protein, Slc26a5 (prestin), to generate mechanical force at high frequencies, which is essential for explaining the exquisite hearing sensitivity of mammalian ears. Previous studies suggest that Slc26a5 continuously diffuses within the membrane, but how can a freely moving motor protein effectively convey forces critical for hearing? To provide direct evidence in OHCs for freely moving Slc26a5 molecules, we created a knockin mouse where Slc26a5 is fused with YFP. These mice and four other strains expressing fluorescently labeled membrane proteins were used to examine their lateral diffusion in the OHC lateral wall. All five proteins showed minimal diffusion, but did move after pharmacological disruption of membrane-associated structures with a cholesterol-depleting agent and salicylate. Thus, our results demonstrate that OHC lateral wall structure constrains the mobility of plasma membrane proteins and that the integrity of such membrane-associated structures are critical for Slc26a5’s active and structural roles. The structural constraint of membrane proteins may exemplify convergent evolution of cellular motors across species. Our findings also suggest a possible mechanism for disorders of cholesterol metabolism with hearing loss such as Niemann-Pick Type C diseases. Nature’s fastest motor is the cochlear outer hair cell (OHC) in the mammalian inner ear. These cells can contract and elongate thousands of times per second. Slc26a5 (prestin) is the essential protein in the fast motor and resides in the plasma membrane of OHC lateral wall. Slc26a5 undergoes voltage-dependent conformational changes associated with the rapid changes in cell length to increase mammalian hearing sensitivity. However, it remains unclear how Slc26a5 transfers the force created to the entire cell. In this study, we show the importance of association between Slc26a5 and specialized membrane structures of the OHC lateral wall. Mobility of Slc26a5 was normally constrained in membrane-associated structures and disruption of these structures by a cholesterol depleting reagent and salicylate liberated Slc26a5 and four other heterologously expressed membrane proteins. These observations provide evidence that OHC lateral wall structure constrains the mobility of plasma membrane proteins and such membrane-associated structures are critical for Slc26a5’s functional roles. Our findings also shed light on other cellular motors across species and suggest a mechanism for cholesterol metabolic disorders in humans.
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Affiliation(s)
- Tetsuji Yamashita
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Pierre Hakizimana
- Department of Clinical and Experimental Medicine, Neuroscience, Linköping University, Linköping, Sweden
- Karolinska Institutet, Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, M1, Karolinska University Hospital, Stockholm, Sweden
| | - Siva Wu
- Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Ahmed Hassan
- Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Stefan Jacob
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Stockholm, Sweden
| | - Jamshid Temirov
- Cell and Tissue Imaging Facility, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Jie Fang
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Marcia Mellado-Lagarde
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, United Kingdom
| | - Richard Gursky
- Cell and Tissue Imaging Facility, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Linda Horner
- Cell and Tissue Imaging Facility, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Barbara Leibiger
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Stockholm, Sweden
| | - Sara Leijon
- Karolinska Institutet, Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, M1, Karolinska University Hospital, Stockholm, Sweden
| | - Victoria E. Centonze
- Cell and Tissue Imaging Facility, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Per-Olof Berggren
- The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, Stockholm, Sweden
| | - Sharon Frase
- Cell and Tissue Imaging Facility, St Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
| | - Manfred Auer
- Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - William E. Brownell
- Bobby R. Alford Department of Otolaryngology, Head & Neck Surgery, and Department of Neuroscience, Baylor College of Medicine, Houston, Texas, United States of America
| | - Anders Fridberger
- Department of Clinical and Experimental Medicine, Neuroscience, Linköping University, Linköping, Sweden
- Karolinska Institutet, Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, M1, Karolinska University Hospital, Stockholm, Sweden
| | - Jian Zuo
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, Tennessee, United States of America
- * E-mail:
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11
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Raimondo F, Corbetta S, Savoia A, Chinello C, Cazzaniga M, Rocco F, Bosari S, Grasso M, Bovo G, Magni F, Pitto M. Comparative membrane proteomics: a technical advancement in the search of renal cell carcinoma biomarkers. MOLECULAR BIOSYSTEMS 2015; 11:1708-16. [DOI: 10.1039/c5mb00020c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Set-up of a specific protocol for membrane protein analysis, applied to label free, comparative proteomics of renal cell carcinoma microdomains.
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Affiliation(s)
| | | | - Andrea Savoia
- Department of Health Sciences
- Univ. of Milano-Bicocca
- Monza
- Italy
| | - Clizia Chinello
- Department of Health Sciences
- Univ. of Milano-Bicocca
- Monza
- Italy
| | - Marta Cazzaniga
- Department of Health Sciences
- Univ. of Milano-Bicocca
- Monza
- Italy
| | - Francesco Rocco
- Department of Specialistic Surgical Sciences
- Urology unit
- Ospedale Maggiore Policlinico Foundation
- IRCCS
- Milano
| | - Silvano Bosari
- Department of Medicine
- Surgery and Dental Sciences
- Pathology Unit
- Ospedale Maggiore Policlinico Foundation Milano
- IRCCS
| | - Marco Grasso
- Department of Surgical Pathology
- Cytology
- Medical Genetics and Nephropathology
- Azienda Ospedaliera San Gerardo
- Monza
| | - Giorgio Bovo
- Department of Surgical Pathology
- Cytology
- Medical Genetics and Nephropathology
- Azienda Ospedaliera San Gerardo
- Monza
| | - Fulvio Magni
- Department of Health Sciences
- Univ. of Milano-Bicocca
- Monza
- Italy
| | - Marina Pitto
- Department of Health Sciences
- Univ. of Milano-Bicocca
- Monza
- Italy
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