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Domínguez-Ruiz M, Murillo-Cuesta S, Contreras J, Cantero M, Garrido G, Martín-Bernardo B, Gómez-Rosas E, Fernández A, Del Castillo FJ, Montoliu L, Varela-Nieto I, Del Castillo I. A murine model for the del(GJB6-D13S1830) deletion recapitulating the phenotype of human DFNB1 hearing impairment: generation and functional and histopathological study. BMC Genomics 2024; 25:359. [PMID: 38605287 PMCID: PMC11007912 DOI: 10.1186/s12864-024-10289-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 04/07/2024] [Indexed: 04/13/2024] Open
Abstract
Inherited hearing impairment is a remarkably heterogeneous monogenic condition, involving hundreds of genes, most of them with very small (< 1%) epidemiological contributions. The exception is GJB2, the gene encoding connexin-26 and underlying DFNB1, which is the most frequent type of autosomal recessive non-syndromic hearing impairment (ARNSHI) in most populations (up to 40% of ARNSHI cases). DFNB1 is caused by different types of pathogenic variants in GJB2, but also by large deletions that keep the gene intact but remove an upstream regulatory element that is essential for its expression. Such large deletions, found in most populations, behave as complete loss-of-function variants, usually associated with a profound hearing impairment. By using CRISPR-Cas9 genetic edition, we have generated a murine model (Dfnb1em274) that reproduces the most frequent of those deletions, del(GJB6-D13S1830). Dfnb1em274 homozygous mice are viable, bypassing the embryonic lethality of the Gjb2 knockout, and present a phenotype of profound hearing loss (> 90 dB SPL) that correlates with specific structural abnormalities in the cochlea. We show that Gjb2 expression is nearly abolished and its protein product, Cx26, is nearly absent all throughout the cochlea, unlike previous conditional knockouts in which Gjb2 ablation was not obtained in all cell types. The Dfnb1em274 model recapitulates the clinical presentation of patients harbouring the del(GJB6-D13S1830) variant and thus it is a valuable tool to study the pathological mechanisms of DFNB1 and to assay therapies for this most frequent type of human ARNSHI.
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Affiliation(s)
- María Domínguez-Ruiz
- Servicio de Genética, Hospital Universitario Ramón y Cajal, IRYCIS, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Silvia Murillo-Cuesta
- Institute for Biomedical Research "Sols-Morreale", Spanish National Research Council-Autonomous University of Madrid, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Julio Contreras
- Institute for Biomedical Research "Sols-Morreale", Spanish National Research Council-Autonomous University of Madrid, Madrid, Spain
- Anatomy and Embryology Department, Faculty of Veterinary, Universidad Complutense de Madrid, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Marta Cantero
- Department of Molecular and Cellular Biology, National Centre for Biotechnology (CNB-CSIC), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Gema Garrido
- Servicio de Genética, Hospital Universitario Ramón y Cajal, IRYCIS, Madrid, Spain
- Department of Molecular and Cellular Biology, National Centre for Biotechnology (CNB-CSIC), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Belén Martín-Bernardo
- Institute for Biomedical Research "Sols-Morreale", Spanish National Research Council-Autonomous University of Madrid, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Elena Gómez-Rosas
- Servicio de Genética, Hospital Universitario Ramón y Cajal, IRYCIS, Madrid, Spain
| | - Almudena Fernández
- Department of Molecular and Cellular Biology, National Centre for Biotechnology (CNB-CSIC), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Francisco J Del Castillo
- Servicio de Genética, Hospital Universitario Ramón y Cajal, IRYCIS, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Lluís Montoliu
- Department of Molecular and Cellular Biology, National Centre for Biotechnology (CNB-CSIC), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Isabel Varela-Nieto
- Institute for Biomedical Research "Sols-Morreale", Spanish National Research Council-Autonomous University of Madrid, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain
| | - Ignacio Del Castillo
- Servicio de Genética, Hospital Universitario Ramón y Cajal, IRYCIS, Madrid, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER-ISCIII), Madrid, Spain.
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Sanchez‐Pupo RE, Finch GA, Johnston DE, Craig H, Abdo R, Barr K, Kerfoot S, Dagnino L, Penuela S. Global pannexin 1 deletion increases tumor-infiltrating lymphocytes in the BRAF/Pten mouse melanoma model. Mol Oncol 2024; 18:969-987. [PMID: 38327091 PMCID: PMC10994229 DOI: 10.1002/1878-0261.13596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/20/2023] [Accepted: 01/18/2024] [Indexed: 02/09/2024] Open
Abstract
Immunotherapies for malignant melanoma seek to boost the anti-tumoral response of CD8+ T cells, but have a limited patient response rate, in part due to limited tumoral immune cell infiltration. Genetic or pharmacological inhibition of the pannexin 1 (PANX1) channel-forming protein is known to decrease melanoma cell tumorigenic properties in vitro and ex vivo. Here, we crossed Panx1 knockout (Panx1-/-) mice with the inducible melanoma model BrafCA, PtenloxP, Tyr::CreERT2 (BPC). We found that deleting the Panx1 gene in mice does not reduce BRAF(V600E)/Pten-driven primary tumor formation or improve survival. However, tumors in BPC-Panx1-/- mice exhibited a significant increase in the infiltration of CD8+ T lymphocytes, with no changes in the expression of early T-cell activation marker CD69, lymphocyte activation gene 3 protein (LAG-3) checkpoint receptor, or programmed cell death ligand-1 (PD-L1) in tumors when compared to the BPC-Panx1+/+ genotype. Our results suggest that, although Panx1 deletion does not overturn the aggressive BRAF/Pten-driven melanoma progression in vivo, it does increase the infiltration of effector immune T-cell populations in the tumor microenvironment. We propose that PANX1-targeted therapy could be explored as a strategy to increase tumor-infiltrating lymphocytes to boost anti-tumor immunity.
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Affiliation(s)
| | - Garth A. Finch
- Department of Anatomy and Cell BiologyWestern UniversityLondonCanada
| | | | - Heather Craig
- Department of Microbiology and ImmunologyWestern UniversityLondonCanada
| | - Rober Abdo
- Department of Anatomy and Cell BiologyWestern UniversityLondonCanada
| | - Kevin Barr
- Department of Anatomy and Cell BiologyWestern UniversityLondonCanada
| | - Steven Kerfoot
- Department of Microbiology and ImmunologyWestern UniversityLondonCanada
| | - Lina Dagnino
- Department of Physiology and PharmacologyWestern UniversityLondonCanada
- Division of Experimental Oncology, Department of Oncology, Schulich School of Medicine and DentistryWestern UniversityLondonCanada
| | - Silvia Penuela
- Department of Anatomy and Cell BiologyWestern UniversityLondonCanada
- Division of Experimental Oncology, Department of Oncology, Schulich School of Medicine and DentistryWestern UniversityLondonCanada
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Dong S, Zou T, Zhen F, Wang T, Zhou Y, Wu J, Nagata T, Matsushita I, Gong B, Kondo H, Li Q, Zhang H. Association of variants in GJA8 with familial acorea-microphthalmia-cataract syndrome. Eur J Hum Genet 2024; 32:413-420. [PMID: 38052906 PMCID: PMC10999424 DOI: 10.1038/s41431-023-01503-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/24/2023] [Accepted: 11/16/2023] [Indexed: 12/07/2023] Open
Abstract
Congenital acorea is a rare disease with the absence of a pupil in the eye. To date, only one family and two isolated cases with congenital acorea have been reported. The gene associated with acorea has not been identified. In this study, we recruited a Chinese family acorea-microphthalmia-cataract syndrome. By analyzing the whole-exome sequencing (WES) data of this Chinese family, we revealed the association of a novel heterozygous variant, NM_005267.5:c.137G>A (p.G46E) in the gap junction protein alpha 8 (GJA8) gene encoding connexin 50 or CX50, with familial acorea-microphthalmia-cataract syndrome. Additionally, another variant, NM_005267.5:c.151G>A (p.D51N) in GJA8, was identified to co-segregate with this syndrome in an unrelated Japanese family. Ectopic expression of p.G46E and p.D51N mutant GJA8 genes in cultured cells caused protein mislocalization, suggesting that the p.G46E and p.D51N mutations in GJA8 impaired the function of the gap junction channels. These results established GJA8 as the first gene associated with familial acorea-microphthalmia-cataract syndrome.
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Affiliation(s)
- Shuqian Dong
- Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Henan Provincial Ophthalmic Hospital, Zhengzhou, China
| | - Tongdan Zou
- The Key Laboratory for Human Disease Gene Study of Sichuan Province and Department of Laboratory Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Fangyuan Zhen
- Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Henan Provincial Ophthalmic Hospital, Zhengzhou, China
| | - Ting Wang
- The Key Laboratory for Human Disease Gene Study of Sichuan Province and Department of Laboratory Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Yongwei Zhou
- Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Henan Provincial Ophthalmic Hospital, Zhengzhou, China
| | - Jiahui Wu
- Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Henan Provincial Ophthalmic Hospital, Zhengzhou, China
| | - Tatsuo Nagata
- Department of Ophthalmology, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Itsuka Matsushita
- Department of Ophthalmology, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Bo Gong
- The Key Laboratory for Human Disease Gene Study of Sichuan Province and Department of Laboratory Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Hiroyuki Kondo
- Department of Ophthalmology, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Qiuming Li
- Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Henan Provincial Ophthalmic Hospital, Zhengzhou, China.
| | - Houbin Zhang
- The Key Laboratory for Human Disease Gene Study of Sichuan Province and Department of Laboratory Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
- Research Unit for Blindness Prevention of Chinese Academy of Medical Sciences (2019RU026), Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, China.
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Leighton SE, Wong RS, Lucaciu SA, Hauser A, Johnston D, Stathopulos PB, Bai D, Penuela S, Laird DW. Cx31.1 can selectively intermix with co-expressed connexins to facilitate its assembly into gap junctions. J Cell Sci 2024; 137:jcs261631. [PMID: 38533727 DOI: 10.1242/jcs.261631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 03/05/2024] [Indexed: 03/28/2024] Open
Abstract
Connexins are channel-forming proteins that function to facilitate gap junctional intercellular communication. Here, we use dual cell voltage clamp and dye transfer studies to corroborate past findings showing that Cx31.1 (encoded by GJB5) is defective in gap junction channel formation, illustrating that Cx31.1 alone does not form functional gap junction channels in connexin-deficient mammalian cells. Rather Cx31.1 transiently localizes to the secretory pathway with a subpopulation reaching the cell surface, which is rarely seen in puncta reminiscent of gap junctions. Intracellular retained Cx31.1 was subject to degradation as Cx31.1 accumulated in the presence of proteasomal inhibition, had a faster turnover when Cx43 was present and ultimately reached lysosomes. Although intracellularly retained Cx31.1 was found to interact with Cx43, this interaction did not rescue its delivery to the cell surface. Conversely, the co-expression of Cx31 dramatically rescued the assembly of Cx31.1 into gap junctions where gap junction-mediated dye transfer was enhanced. Collectively, our results indicate that the localization and functional status of Cx31.1 is altered through selective interplay with co-expressed connexins, perhaps suggesting Cx31.1 is a key regulator of intercellular signaling in keratinocytes.
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Affiliation(s)
- Stephanie E Leighton
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Robert S Wong
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Sergiu A Lucaciu
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Alexandra Hauser
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Danielle Johnston
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Peter B Stathopulos
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Donglin Bai
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Silvia Penuela
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
- Western's Bone and Joint Institute, The Dr. Sandy Kirkley Centre for Musculoskeletal Research, University Hospital, London, ON N6A 5B9, Canada
- Division of Experimental Oncology, Department of Oncology, University of Western Ontario, London, ON N6A 5W9, Canada
| | - Dale W Laird
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON N6A 5C1, Canada
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON N6A 5C1, Canada
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Ruan Y, Cheng X, Zhang W, Zhao L, Xie J, Wen C, Li Y, Deng L, Huang L. [Mutation spectrum analysis of 23-site chip neonatal deafness genetic screening]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2024; 38:267-272. [PMID: 38563166 DOI: 10.13201/j.issn.2096-7993.2024.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Indexed: 04/04/2024]
Abstract
Objective:To analyze the mutation spectrum of 23-site chip newborn deafness genetic screening in Beijing, and to provide basis for genetic counseling and clinical diagnosis and treatment. Methods:The study included 21 006 babies born in Beijing from December 2022 to June 2023. All subjects underwent newborn deafness genetic screening in Beijing Tongren Hospital, covering 23 variants in 4 genes, the GJB2 gene(c.35delG, c.176_191del16, c.235delC, c.299_300delAT, c.109G>A, c.257C>G, c.512insAACG, c.427C>T, c.35insG), SLC26A4 gene(c.919-2A>G, c.2168A>G, c.1174A>T, c.1226G>A, c.1229C>T, c.1975G>C, c.2027T>A, c.589G>A, c.1707+5G>A, c.917insG, c.281C>T), Mt12SrRNA(m.1555A>G, m.1494C>T) and GJB3 gene(c.538C>T). The mutation detection rate and allele frequency were analyzed. Results:The overall mutation detection rate was 11.516%(2 419/21 006), with the GJB2 gene being the most frequently involved at 9.097%(1 911/21 006), followed by the SLC26A4 gene at 2.123%(446/21 006), the GJB3 gene at 0.362%(76/21 006) and Mt12SrRNA at 0.176%(37/21 006). Among the GJB2 genes, c.109G>A and c.235delC mutation detection rates were the highest, with 6.579%(1 382/21 006) and 1.795%(377/21 006), respectively. Of the SLC26A4 genes, c.919-2A>G and c.2168A>G had the highest mutation rates of 1.423%(299/21 006) and 0.233%(49/21 106), respectively. Regarding the allele frequency, GJB2 c.109G>A was the most common variant with an allele frequency of 3.359%(1 411/42 012), followed by the GJB2 c.235delC at 0.897%(377/42 012) and the SLC26A4 c.919-2A>G at 0.719%(302/42 012). Conclusion:23-site chip newborn deafness genetic screening in Beijing showed that GJB2 c.109G>A mutation detection rate and allele frequency were the highest. This study has enriched the epidemiological data of 23-site chip genetic screening mutation profiles for neonatal deafness, which can provide evidence for clinical practice.
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Affiliation(s)
- Yu Ruan
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Xiaohua Cheng
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Wei Zhang
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Liping Zhao
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Jinge Xie
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Cheng Wen
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Yue Li
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Lin Deng
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
| | - Lihui Huang
- Department of Otolaryngology Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing Institute of Otolaryngology,Key Laboratory of Otolaryngology Head and Neck Surgery(Capital Medical University
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Yu S, Ren H, Liu T, Han X, Guo H, Ning Q, Li Y, Zhou H, Chen M, Hu T. Metformin suppresses NFE2L1 pathway activation to inhibit gap junction beta protein expression in NSCLC. Cancer Med 2024; 13:e7021. [PMID: 38562019 PMCID: PMC10985411 DOI: 10.1002/cam4.7021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 01/05/2024] [Accepted: 01/31/2024] [Indexed: 04/04/2024] Open
Abstract
OBJECTIVE Non-small-cell lung cancer (NSCLC) is a deadly form of cancer that exhibits extensive intercellular communication which contributed to chemoradiotherapy resistance. Recent evidence suggests that arrange of key proteins are involved in lung cancer progression, including gap junction proteins (GJPs). METHODS AND RESULTS In this study, we examined the expression patterns of GJPs in NSCLC, uncovering that both gap junction protein, beta 2 (GJB2) and gap junction protein, beta 2 (GJB3) are increased in LUAD and LUSC. We observed a correlation between the upregulation of GJB2, GJB3 in clinical samples and a worse prognosis in patients with NSCLC. By examining the mechanics, we additionally discovered that nuclear factor erythroid-2-related factor 1 (NFE2L1) had the capability to enhance the expression of connexin26 and connexin 31 in the NSCLC cell line A549. In addition, the use of metformin was discovered to cause significant downregulation of gap junction protein, betas (GJBs) by limiting the presence of NFE2L1 in the cytoplasm. CONCLUSION This emphasizes the potential of targeting GJBs as a viable treatment approach for NSCLC patients receiving metformin.
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Affiliation(s)
- Shuo Yu
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
- Department of General SurgeryThe Second Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Hui Ren
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Tingting Liu
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Xiaoyan Han
- Department of General SurgeryWeifang People's HospitalWeifangShandongChina
| | - Hui Guo
- Department of OncologyThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Qian Ning
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Yang Li
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Hong Zhou
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Mingwei Chen
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
| | - Tinghua Hu
- Department of Respiratory and Critical Care MedicineThe First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina
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Lemes JBP, Malange KF, Carvalho NS, Neves AF, Urban-Maldonado M, Kempe PRG, Nishijima CM, Fagundes CC, Lotufo CMDC, Suadicani SO, Parada CA. Blocking Pannexin 1 Channels Alleviates Peripheral Inflammatory Pain but not Paclitaxel-Induced Neuropathy. J Integr Neurosci 2024; 23:64. [PMID: 38538230 DOI: 10.31083/j.jin2303064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/04/2023] [Accepted: 12/11/2023] [Indexed: 04/05/2024] Open
Abstract
BACKGROUND Pannexin1 (Panx1) is a membrane channel expressed in different cells of the nervous system and is involved in several pathological conditions, including pain and inflammation. At the central nervous system, the role of Panx1 is already well-established. However, in the periphery, there is a lack of information regarding the participation of Panx1 in neuronal sensitization. The dorsal root ganglion (DRG) is a critical structure for pain processing and modulation. For this reason, understanding the molecular mechanism in the DRG associated with neuronal hypersensitivity has become highly relevant to discovering new possibilities for pain treatment. Here, we aimed to investigate the role of Panx1 in acute nociception and peripheral inflammatory and neuropathic pain by using two different approaches. METHODS Rats were treated with a selective Panx1 blocker peptide (10Panx) into L5-DRG, followed by ipsilateral intraplantar injection of carrageenan, formalin, or capsaicin. DRG neuronal cells were pre-treated with 10Panx and stimulated by capsaicin to evaluate calcium influx. Panx1 knockout mice (Panx1-KO) received carrageenan or capsaicin into the paw and paclitaxel intraperitoneally. The von Frey test was performed to measure the mechanical threshold of rats' and mice's paws before and after each treatment. RESULTS Pharmacological blockade of Panx1 in the DRG of rats resulted in a dose-dependent decrease of mechanical allodynia triggered by carrageenan, and nociception decreased in the second phase of formalin. Nociceptive behavior response induced by capsaicin was significantly lower in rats treated with Panx1 blockade into DRG. Neuronal cells with Panx1 blockage showed lower intracellular calcium response than untreated cells after capsaicin administration. Accordingly, Panx1-KO mice showed a robust reduction in mechanical allodynia after carrageenan and a lower nociceptive response to capsaicin. A single dose of paclitaxel promoted acute mechanical pain in wildtype (WT) but not in Panx1-KO mice. Four doses of chemotherapy promoted chronic mechanical allodynia in both genotypes, although Panx1-KO mice had significant ablation in the first eight days. CONCLUSION Our findings suggest that Panx1 is critical for developing peripheral inflammatory pain and acute nociception involving transient receptor potential vanilloid subtype 1 (TRPV1) but is not essential for neuropathic pain chronicity.
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Affiliation(s)
- Julia Borges Paes Lemes
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
| | - Kaue Franco Malange
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
| | - Nathalia Santos Carvalho
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
| | - Amanda Ferreira Neves
- Department of Medicine, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Marcia Urban-Maldonado
- Department of Urology, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA
| | | | - Catarine Massucato Nishijima
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
| | - Cecilia Costa Fagundes
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
| | - Celina Monteiro da Cruz Lotufo
- Institute of Biomedical Sciences, Department of Physiology, Federal University of Uberlandia (UFU), 38408-102 Uberlandia, MG, Brazil
| | - Sylvia Ottile Suadicani
- Department of Urology, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY 10461, USA
| | - Carlos Amilcar Parada
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil
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Pineros J, Zhu X, Ding B, Frisina RD. Connexins 30 and 43 expression changes in relation to age-related hearing loss. Hear Res 2024; 444:108971. [PMID: 38359484 PMCID: PMC10939722 DOI: 10.1016/j.heares.2024.108971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/27/2024] [Accepted: 02/10/2024] [Indexed: 02/17/2024]
Abstract
Age-related hearing loss (ARHL), also known as presbycusis, is the number one communication disorder for aging adults. Connexin proteins are essential for intercellular communication throughout the human body, including the cochlea. Mutations in connexin genes have been linked to human syndromic and nonsyndromic deafness; thus, we hypothesize that changes in connexin gene and protein expression with age are involved in the etiology of ARHL. Here, connexin gene and protein expression changes for CBA/CaJ mice at different ages were examined, and correlations were analyzed between the changes in expression levels and functional hearing measures, such as ABRs and DPOAEs. Moreover, we investigated potential treatment options for ARHL. Results showed significant downregulation of Cx30 and Cx43 gene expression and significant correlations between the degree of hearing loss and the changes in gene expression for both genes. Moreover, dose-dependent treatments utilizing cochlear cell lines showed that aldosterone hormone therapy significantly increased Cx expression. In vivo mouse treatments with aldosterone also showed protective effects on connexin expression in aging mice. Based on these functionally relevant findings, next steps can include more investigations of the mechanisms related to connexin family gap junction protein expression changes during ARHL; and expand knowledge of clinically-relevant treatment options by knowing what specific members of the Cx family and related inter-cellular proteins should be targeted therapeutically.
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Affiliation(s)
- Jennifer Pineros
- Department of Medical Engineering, College of Engineering, University of South Florida, Tampa, FL 33620, USA; Global Center for Hearing and Speech Research, University of South Florida, Tampa, FL 33612, USA
| | - Xiaoxia Zhu
- Department of Medical Engineering, College of Engineering, University of South Florida, Tampa, FL 33620, USA; Global Center for Hearing and Speech Research, University of South Florida, Tampa, FL 33612, USA
| | - Bo Ding
- Department of Medical Engineering, College of Engineering, University of South Florida, Tampa, FL 33620, USA; Global Center for Hearing and Speech Research, University of South Florida, Tampa, FL 33612, USA
| | - Robert D Frisina
- Department of Medical Engineering, College of Engineering, University of South Florida, Tampa, FL 33620, USA; Global Center for Hearing and Speech Research, University of South Florida, Tampa, FL 33612, USA; Department of Communication Sciences and Disorders, College of Behavioral & Community Sciences, University of South Florida, Tampa, FL 33620, USA; Morsani College of Medicine, University of South Florida, Tampa, FL 33620, USA.
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9
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Xiong X, Chen W, Chen C, Wu Q, He C. Analysis of the function and therapeutic strategy of connexin 43 from its subcellular localization. Biochimie 2024; 218:1-7. [PMID: 37611889 DOI: 10.1016/j.biochi.2023.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 08/07/2023] [Accepted: 08/18/2023] [Indexed: 08/25/2023]
Abstract
Connexins (Cxs) are a family of transmembrane proteins located in the plasma membrane of human cells, among which connexin 43 (Cx43) is abundantly expressed in various types of human cells. Cx43, encoded by the gap junction protein alpha 1 (GJA1) gene, assembles into a hexameric structure in the Golgi apparatus and translocates to the plasma membrane to form hemichannels (Hcs), which pair with those of the cells in contact with each other and form gap junction intercellular communication (GJIC). The role of Cx43 as a connexin localized at the plasma membrane to perform channel functions is well recognized in previous studies, but recent studies have found that it can also be localized in the nucleus, mitochondria, or present in extracellular vesicles (EVs) and tunneling nanotubes (TNTs). Cx43 in the nucleus is involved in gene transcription regulation, cytoskeleton formation, cell migration and adhesion. Cx43 in mitochondria is involved in mitochondrial respiration-related functions, and Cx43 in extracellular vesicles and tunneling nanotubes is involved in distant cellular information exchange. It is because of the diverse distribution of subcellular localization of Cx43 that it is possible to explore the corresponding functions by analyzing its localization. In this review, we summarize the important roles of Cx43 in disease development from the perspective of subcellular localization, and provide new ideas for Cx43 as a therapeutic target and the search for related pathological mechanisms.
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Affiliation(s)
- Xinhai Xiong
- The Second Affiliated Hospital of Hunan Normal University, Changsha, Hunan, 410003, China
| | - Wenjie Chen
- The Second Affiliated Hospital of Hunan Normal University, Changsha, Hunan, 410003, China
| | - Cheng Chen
- The Second Affiliated Hospital of Hunan Normal University, Changsha, Hunan, 410003, China; 926 Hospital of the People's Liberation Army, Kaiyuan, Yunnan, 661600, China.
| | - Qi Wu
- The Second Affiliated Hospital of Hunan Normal University, Changsha, Hunan, 410003, China
| | - Chaopeng He
- The Second Xiangya Hospital, Changsha, Hunan, 410011, China
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10
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Li YQ, Ma H, Wang QY, Liu DS, Wang W, Li SX, Zuo RX, Shen T, Zhu BS, Sa YL. Low frequency of SLC26A4 c.919-2A > G variant among patients with nonsyndromic hearing loss in Yunnan of Southwest China. BMC Med Genomics 2024; 17:55. [PMID: 38378613 PMCID: PMC10877886 DOI: 10.1186/s12920-024-01829-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 02/09/2024] [Indexed: 02/22/2024] Open
Abstract
BACKGROUND Gene variants are responsible for more than half of hearing loss, particularly in nonsyndromic hearing loss (NSHL). The most common pathogenic variant in SLC26A4 gene found in East Asian populations is c.919-2A > G followed by c.2168A > G (p.H723R). This study was to evaluate their variant frequencies in patients with NSHL from special education schools in nine different areas of Southwest China's Yunnan. METHODS We performed molecular characterization by PCR-products directly Sanger sequencing of the SLC26A4 c.919-2AG and c.2168 A > G variants in 1167 patients with NSHL including 533 Han Chinese and 634 ethnic minorities. RESULTS The SLC26A4 c.919-2A > G variant was discovered in 8 patients with a homozygous state (0.69%) and twenty-five heterozygous (2.14%) in 1167 patients with NSHL. The total carrier rate of the c.919-2A > G variant was found in Han Chinese patients with 4.50% and ethnic minority patients with 1.42%. A significant difference existed between the two groups (P < 0.05). The c.919-2A > G allele variant frequency was ranged from 3.93% in Kunming to zero in Lincang and Nvjiang areas of Yunnan. We further detected the SLC26A4 c.2168 A > G variant in this cohort with one homozygotes (0.09%) and seven heterozygotes (0.60%), which was detected in Baoshan, Honghe, Licang and Pu`er areas. Between Han Chinese group (0.94%) and ethnic minority group (0.47%), there was no statistical significance (P > 0.05). Three Han Chinese patients (0.26%) carried compound heterozygosity for c.919-2A > G and c.2168 A > G. CONCLUSION These data suggest that the variants in both SLC26A4 c.919-2A > G and c.2168 A > G were relatively less frequencies in this cohort compared to the average levels in most regions of China, as well as significantly lower than that in Han-Chinese patients. These results broadened Chinese population genetic information resources and provided more detailed information for regional genetic counselling for Yunnan.
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Affiliation(s)
- Yan-Qiong Li
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
- Central Sterile Supply Department, The First People's Hospital of Yunnan Province, (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Heng Ma
- The Outpatient Department of Yanan Hospital Affiliated to Kunming Medical University, Kunming, 650051, Yunnan, China
| | - Qin-Yao Wang
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - De-Sheng Liu
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
- The Emergency Department of Traditional Chinese Medicine Hospital of Sichuan Province, (The Affiliated Hospital of Chengdu University of Traditional Chinese Medicine), Chengdu, 610075, Sichuan, China
| | - Wei Wang
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Shi-Xin Li
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Rong-Xia Zuo
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Tao Shen
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Bao-Sheng Zhu
- Center of Genetic Diagnosis (Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Ya-Lian Sa
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China.
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11
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Alkhidir S, El-Akouri K, Al-Dewik N, Khodjet-El-Khil H, Okashah S, Islam N, Ben-Omran T, Al-Shafai M. The genetic basis and the diagnostic yield of genetic testing related to nonsyndromic hearing loss in Qatar. Sci Rep 2024; 14:4202. [PMID: 38378725 PMCID: PMC10879212 DOI: 10.1038/s41598-024-52784-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 01/23/2024] [Indexed: 02/22/2024] Open
Abstract
Hearing loss is the most predominant sensory defect occurring in pediatrics, of which, 66% cases are attributed to genetic factors. The prevalence of hereditary hearing loss increases in consanguineous populations, and the prevalence of hearing loss in Qatar is 5.2%. We aimed to investigate the genetic basis of nonsyndromic hearing loss (NSHL) in Qatar and to evaluate the diagnostic yield of different genetic tests available. A retrospective chart review was conducted for 59 pediatric patients with NSHL referred to the Department of Adult and Pediatric Medical Genetics at Hamad Medical Corporation in Qatar, and who underwent at least one genetic test. Out of the 59 patients, 39 were solved cases due to 19 variants in 11 genes and two copy number variants that explained the NSHL phenotype. Of them 2 cases were initially uncertain and were reclassified using familial segregation. Around 36.8% of the single variants were in GJB2 gene and c.35delG was the most common recurrent variant seen in solved cases. We detected the c.283C > T variant in FGF3 that was seen in a Qatari patient and found to be associated with NSHL for the first time. The overall diagnostic yield was 30.7%, and the diagnostic yield was significantly associated with genetic testing using GJB2 sequencing and using the hearing loss (HL) gene panel. The diagnostic yield for targeted familial testing was 60% (n = 3 patients) and for gene panel was 50% (n = 5). Thus, we recommend using GJB2 gene sequencing as a first-tier genetic test and HL gene panel as a second-tier genetic test for NSHL. Our work provided new insights into the genetic pool of NSHL among Arabs and highlights its unique diversity, this is believed to help further in the diagnostic and management options for NSHL Arab patients.
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Affiliation(s)
- Shaza Alkhidir
- Department of Biomedical Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar
- Department of Adult and Pediatric Medical Genetics, Hamad Medical Corporation, Doha, Qatar
| | - Karen El-Akouri
- Department of Adult and Pediatric Medical Genetics, Hamad Medical Corporation, Doha, Qatar
- Division of Genetic and Genomic Medicine, Sidra Medicine, Doha, Qatar
| | - Nader Al-Dewik
- Department of Adult and Pediatric Medical Genetics, Hamad Medical Corporation, Doha, Qatar
| | - Houssein Khodjet-El-Khil
- Department of Biomedical Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar
| | - Sarah Okashah
- Department of Adult and Pediatric Medical Genetics, Hamad Medical Corporation, Doha, Qatar
- Department of Public Health, College of Health Sciences, QU Health, Qatar University, Doha, Qatar
| | - Nazmul Islam
- Department of Public Health, College of Health Sciences, QU Health, Qatar University, Doha, Qatar
- Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario, Canada
| | - Tawfeg Ben-Omran
- Department of Adult and Pediatric Medical Genetics, Hamad Medical Corporation, Doha, Qatar.
- Division of Genetic and Genomic Medicine, Sidra Medicine, Doha, Qatar.
| | - Mashael Al-Shafai
- Department of Biomedical Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar.
- Biomedical Research Center, Qatar University, Doha, Qatar.
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12
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Liu Y, Mo R, Chen Z, Yang Y. Novel variants in ABCA12 cause erythrokeratodermia variabilis. Br J Dermatol 2024; 190:454. [PMID: 38085035 DOI: 10.1093/bjd/ljad494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/26/2023] [Accepted: 12/04/2023] [Indexed: 02/18/2024]
Abstract
We present a patient clinically diagnosed with erythrokeratodermia variabilis harbored compound heterozygous variants in the ABCA12 gene, including an unreported c.3653A>G variant and c.7247C>T, both of which were predicted to be pathogenic.
This finding provide evidence that ABCA12 pathogenic variants were associated with recessive erythrokeratodermia variabilis, an otherwise dominant disorder.
This case highlighted the clinical diversity of ABCA12 variants and the genetic heterogeneity underlying the erythrokeratodermia variabilis, which is significant for genetic counseling and prenatal diagnosis.
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Affiliation(s)
- Yihe Liu
- Genetic Skin Disease Center, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Ran Mo
- Genetic Skin Disease Center, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Zhiming Chen
- Genetic Skin Disease Center, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
| | - Yong Yang
- Genetic Skin Disease Center, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
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13
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Yoshimoto Y, Yoshimoto S, Kakiuchi K, Miyagawa R, Ota S, Hosokawa T, Ishida S, Higuchi Y, Hashiguchi A, Takashima H, Arawaka S. Spatial Fluctuation of Central Nervous System Lesions in X-linked Charcot-Marie-Tooth Disease with a Novel GJB1 Mutation. Intern Med 2024; 63:571-576. [PMID: 37407465 PMCID: PMC10937141 DOI: 10.2169/internalmedicine.1713-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/28/2023] [Indexed: 07/07/2023] Open
Abstract
X-linked Charcot-Marie-Tooth disease type 1 (CMTX1), the most common form of CMTX, is caused by gap-junction beta 1 (GJB1) mutations. We herein report a 25-year-old Japanese man with disorientation, right hemiparesis, and dysarthria. Brain magnetic resonance imaging (MRI) showed high signal intensities in the bilateral cerebral white matter on diffusion-weighted imaging. He had experienced 2 episodes of transient central nervous system symptoms (at 7 and 13 years old). A genetic analysis identified a novel GJB1 mutation, c.169C>T, p.Gln57*. MRI abnormalities shifted from the cerebral white matter to the corpus callosum and had disappeared at the five-month follow-up. Transient changes between these lesions may indicate CMTX1.
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Affiliation(s)
- Yukiyo Yoshimoto
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Shoko Yoshimoto
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Kensuke Kakiuchi
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Rumina Miyagawa
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Shin Ota
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Takafumi Hosokawa
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Shimon Ishida
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
| | - Yujiro Higuchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medicine and Dental Sciences, Japan
| | - Akihiro Hashiguchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medicine and Dental Sciences, Japan
| | - Hiroshi Takashima
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medicine and Dental Sciences, Japan
| | - Shigeki Arawaka
- Division of Neurology, Department of Internal Medicine IV, Osaka Medical and Pharmaceutical University, Japan
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14
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Shiadeh SMJ, Goretta F, Svedin P, Jansson T, Mallard C, Ardalan M. Long-term impact of maternal obesity on the gliovascular unit and ephrin signaling in the hippocampus of adult offspring. J Neuroinflammation 2024; 21:39. [PMID: 38308309 PMCID: PMC10837922 DOI: 10.1186/s12974-024-03030-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 01/24/2024] [Indexed: 02/04/2024] Open
Abstract
BACKGROUND Children born to obese mothers are at increased risk of developing mood disorders and cognitive impairment. Experimental studies have reported structural changes in the brain such as the gliovascular unit as well as activation of neuroinflammatory cells as a part of neuroinflammation processing in aged offspring of obese mothers. However, the molecular mechanisms linking maternal obesity to poor neurodevelopmental outcomes are not well established. The ephrin system plays a major role in a variety of cellular processes including cell-cell interaction, synaptic plasticity, and long-term potentiation. Therefore, in this study we determined the impact of maternal obesity in pregnancy on cortical, hippocampal development, vasculature and ephrin-A3/EphA4-signaling, in the adult offspring in mice. METHODS Maternal obesity was induced in mice by a high fat/high sugar Western type of diet (HF/HS). We collected brain tissue (prefrontal cortex and hippocampus) from 6-month-old offspring of obese and lean (control) dams. Hippocampal volume, cortical thickness, myelination of white matter, density of astrocytes and microglia in relation to their activity were analyzed using 3-D stereological quantification. mRNA expression of ephrin-A3, EphA4 and synaptic markers were measured by qPCR in the brain tissue. Moreover, expression of gap junction protein connexin-43, lipocalin-2, and vascular CD31/Aquaporin 4 were determined in the hippocampus by immunohistochemistry. RESULTS Volume of hippocampus and cortical thickness were significantly smaller, and myelination impaired, while mRNA levels of hippocampal EphA4 and post-synaptic density (PSD) 95 were significantly lower in the hippocampus in the offspring of obese dams as compared to offspring of controls. Further analysis of the hippocampal gliovascular unit indicated higher coverage of capillaries by astrocytic end-feet, expression of connexin-43 and lipocalin-2 in endothelial cells in the offspring of obese dams. In addition, offspring of obese dams demonstrated activation of microglia together with higher density of cells, while astrocyte cell density was lower. CONCLUSION Maternal obesity affects brain size, impairs myelination, disrupts the hippocampal gliovascular unit and decreases the mRNA expression of EphA4 and PSD-95 in the hippocampus of adult offspring. These results indicate that the vasculature-glia cross-talk may be an important mediator of altered synaptic plasticity, which could be a link between maternal obesity and neurodevelopmental/neuropsychiatric disorders in the offspring.
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Affiliation(s)
- Seyedeh Marziyeh Jabbari Shiadeh
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Clinical Medicine, Translational Neuropsychiatry Unit, Aarhus University, Aarhus, Denmark
| | - Fanny Goretta
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Pernilla Svedin
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Thomas Jansson
- Division of Reproductive Sciences, Department of OB/GYN, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - Carina Mallard
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Maryam Ardalan
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
- Department of Clinical Medicine, Translational Neuropsychiatry Unit, Aarhus University, Aarhus, Denmark.
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15
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Mc Lean K, Bignotti S, Callea M, Cammarata-Scalisi F, Steger B, Armstrong D, Lagan M, Sinton J, Semeraro F, Kaye SB, Romano V, Willoughby CE. Ocular phenotype and therapeutic interventions in keratitis-ichthyosis-deafness (KID) syndrome. Ophthalmic Genet 2024; 45:16-22. [PMID: 37755702 DOI: 10.1080/13816810.2023.2258218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 09/07/2023] [Indexed: 09/28/2023]
Abstract
BACKGROUND To report ocular manifestations, clinical course, and therapeutic management of patients with molecular genetically confirmed keratitis-ichthyosis-deafness syndrome. METHODS Four patients, aged 19 to 46, with keratitis-ichthyosis-deafness syndrome from across the UK were recruited for a general and ocular examination and GJB2 (Cx26) mutational analysis. The ocular examination included best-corrected visual acuity, slit-lamp bio-microscopy, and ocular surface assessment. Mutational analysis of the coding region of GJB2 (Cx26) was performed by bidirectional Sanger sequencing. RESULTS All four individuals had the characteristic systemic features of keratitis-ichthyosis-deafness syndrome. Each patient was found to have a missense mutation, resulting in the substitution of aspartic acid with asparagine at codon 50 (p.D50N). Main ophthalmic features were vascularizing keratopathy, ocular surface disease, hyperkeratotic lid lesions, recurrent epithelial defects, and corneal stromal scarring. One patient had multiple surgical procedures, including superficial keratectomies and lamellar keratoplasty, which failed to prevent severe visual loss. In contrast, oral therapy with ketoconazole stabilized the corneal and skin disease in two other patients with keratitis-ichthyosis-deafness syndrome. The patient who underwent intracorneal bevacizumab injection showed a marked reduction in corneal vascularization following a single application. CONCLUSIONS Keratitis-ichthyosis-deafness syndrome is a rare ectodermal dysplasia caused by heterozygous mutations in GJB2 (Cx26) with a severe, progressive vascularizing keratopathy. Oral ketoconazole therapy may offer benefit in stabilizing the corneal and skin disease.
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Affiliation(s)
- Keri Mc Lean
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, UK
- Department of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool, UK
| | - Stefano Bignotti
- Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, Ophthalmology Clinic, University of Brescia, Brescia, Italy
| | - Michele Callea
- Pediatric Dentistry and Special Dental Care Unit, Meyer Children's University Hospital IRCCS, Florence, Italy
| | | | - Bernhard Steger
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
| | - David Armstrong
- Department of Ophthalmology, Royal Victoria Hospital, Belfast, UK
| | - Maeve Lagan
- Department of Ophthalmology, Royal Victoria Hospital, Belfast, UK
| | - Janet Sinton
- Department of Ophthalmology, Altnagelvin Area Hospital, Londonderry, UK
| | - Francesco Semeraro
- Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, Ophthalmology Clinic, University of Brescia, Brescia, Italy
| | - Stephen B Kaye
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, UK
- Department of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool, UK
| | - Vito Romano
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, UK
- Department of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool, UK
- Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, Ophthalmology Clinic, University of Brescia, Brescia, Italy
| | - Colin E Willoughby
- Department of Corneal and External Eye Diseases, St. Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, UK
- Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria
- Genomic Medicine, Biomedical Sciences Research Institute, Ulster University, Coleraine, Northern Ireland, UK
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16
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Ishikawa M, Hasanali ZS, Zhao Y, Das A, Lavaert M, Roman CJ, Londregan J, Allman D, Bhandoola A. Bone marrow plasma cells require P2RX4 to sense extracellular ATP. Nature 2024; 626:1102-1107. [PMID: 38355795 PMCID: PMC11025016 DOI: 10.1038/s41586-024-07047-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 01/09/2024] [Indexed: 02/16/2024]
Abstract
Plasma cells produce large quantities of antibodies and so play essential roles in immune protection1. Plasma cells, including a long-lived subset, reside in the bone marrow where they depend on poorly defined microenvironment-linked survival signals1. We show that bone marrow plasma cells use the ligand-gated purinergic ion channel P2RX4 to sense extracellular ATP released by bone marrow osteoblasts through the gap-junction protein pannexin 3 (PANX3). Mutation of Panx3 or P2rx4 each caused decreased serum antibodies and selective loss of bone marrow plasma cells. Compared to their wild-type counterparts, PANX3-null osteoblasts secreted less extracellular ATP and failed to support plasma cells in vitro. The P2RX4-specific inhibitor 5-BDBD abrogated the impact of extracellular ATP on bone marrow plasma cells in vitro, depleted bone marrow plasma cells in vivo and reduced pre-induced antigen-specific serum antibody titre with little posttreatment rebound. P2RX4 blockade also reduced autoantibody titre and kidney disease in two mouse models of humoral autoimmunity. P2RX4 promotes plasma cell survival by regulating endoplasmic reticulum homeostasis, as short-term P2RX4 blockade caused accumulation of endoplasmic reticulum stress-associated regulatory proteins including ATF4 and B-lineage mutation of the pro-apoptotic ATF4 target Chop prevented bone marrow plasma cell demise on P2RX4 inhibition. Thus, generating mature protective and pathogenic plasma cells requires P2RX4 signalling controlled by PANX3-regulated extracellular ATP release from bone marrow niche cells.
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Affiliation(s)
- Masaki Ishikawa
- Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4254, USA
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104-6082, USA
| | - Zainul S. Hasanali
- Address correspondence to: Masaki Ishikawa () David Allman (), or Avinash Bhandoola ()
| | - Yongge Zhao
- Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4254, USA
| | - Arundhoti Das
- Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4254, USA
| | - Marieke Lavaert
- Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4254, USA
| | | | | | - David Allman
- Address correspondence to: Masaki Ishikawa () David Allman (), or Avinash Bhandoola ()
| | - Avinash Bhandoola
- Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4254, USA
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17
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Wong RS, Chen H, Li YX, Esseltine JL, Stathopulos PB, Bai D. Human Cx50 Isoleucine177 prevents heterotypic docking and formation of functional gap junction channels with Cx43. Am J Physiol Cell Physiol 2024; 326:C414-C428. [PMID: 38145302 DOI: 10.1152/ajpcell.00634.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 12/26/2023]
Abstract
The human lens is an avascular organ, and its transparency is dependent on gap junction (GJ)-mediated microcirculation. Lens GJs are composed of three connexins with Cx46 and Cx50 being expressed in lens fiber cells and Cx43 and Cx50 in the epithelial cells. Impairment of GJ communication by either Cx46 or Cx50 mutations has been shown to be one of the main molecular mechanisms of congenital cataracts in mutant carrier families. The docking compatibility and formation of functional heterotypic GJs for human lens connexins have not been studied. Previous study on rodent lens connexins revealed that Cx46 can form functional heterotypic GJs with Cx50 and Cx43, but Cx50 cannot form heterotypic GJ with Cx43 due to its second extracellular (EL2) domain. To study human lens connexin docking and formation of functional heterotypic GJs, we developed a genetically engineered HEK293 cell line with endogenously expressed Cx43 and Cx45 ablated. The human lens connexins showed docking compatibility identical to those found in the rodent connexins. To reveal the structural mechanisms of the docking incompatibility between Cx50 and Cx43, we designed eight variants based on the differences between the EL2 of Cx50 and Cx46. We found that Cx50I177L is sufficient to establish heterotypic docking with Cx43 with some interesting gating properties. Our structure models indicate this residue is important for interdomain interactions within a single connexin, Cx50 I177L showed an increased interdomain interaction which might alter the docking interface structure to be compatible with Cx43.NEW & NOTEWORTHY The human lens is an avascular organ, and its transparency is partially dependent on gap junction (GJ) network composed of Cx46, Cx50, and Cx43. We found that human Cx46 can dock and form functional heterotypic GJs with Cx50 and Cx43, but Cx50 is unable to form functional heterotypic GJs with Cx43. Through mutagenesis and patch-clamp study of several designed variants, we found that Cx50 I177L was sufficient to form functional heterotypic GJs with Cx43.
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Affiliation(s)
- Robert S Wong
- Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Honghong Chen
- Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Yi X Li
- Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Jessica L Esseltine
- Division of BioMedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
| | - Peter B Stathopulos
- Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Donglin Bai
- Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
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18
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De Rosa MA, Bernardi MT, Kleppe S, Walz K. Hearing Loss: Genetic Testing, Current Advances and the Situation in Latin America. Genes (Basel) 2024; 15:178. [PMID: 38397168 PMCID: PMC10888486 DOI: 10.3390/genes15020178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/23/2024] [Accepted: 01/25/2024] [Indexed: 02/25/2024] Open
Abstract
Congenital hearing loss is the most common birth defect, estimated to affect 2-3 in every 1000 births, with ~50-60% of those related to genetic causes. Technological advances enabled the identification of hundreds of genes related to hearing loss (HL), with important implications for patients, their families, and the community. Despite these advances, in Latin America, the population with hearing loss remains underdiagnosed, with most studies focusing on a single locus encompassing the GJB2/GJB6 genes. Here we discuss how current and emerging genetic knowledge has the potential to alter the approach to diagnosis and management of hearing loss, which is the current situation in Latin America, and the barriers that still need to be overcome.
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Affiliation(s)
- Maria Agustina De Rosa
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina; (M.A.D.R.); (M.T.B.)
| | - Maria T. Bernardi
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina; (M.A.D.R.); (M.T.B.)
| | - Soledad Kleppe
- Department of Clinical Pediatrics, Hospital Italiano de Buenos Aires, Instituto Universitario Hospital Italiano de Buenos Aires, Buenos Aires C1199ABB, Argentina;
| | - Katherina Walz
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina; (M.A.D.R.); (M.T.B.)
- John P. Hussman Institute for Human Genomics, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
- John T. Macdonald Foundation Department of Human Genetics, Miller School of Medicine, University of Miami, 1501 NW 10th Avenue, BRB-418 (M-860), Miami, FL 33136, USA
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Zhai P, Zhang H, Li Q, Yang M, Guo Y, Xing C. DNMT1-mediated NR3C1 DNA methylation enables transcription activation of connexin40 and augments angiogenesis during colorectal cancer progression. Gene 2024; 892:147887. [PMID: 37813207 DOI: 10.1016/j.gene.2023.147887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/12/2023] [Accepted: 10/06/2023] [Indexed: 10/11/2023]
Abstract
Colorectal cancer (CRC) continues to be a major contributor to cancer-related mortality. Connexin 40 (CX40) is one of the major gap junction proteins with the capacity in regulating cell-to-cell communication and angiogenesis. This study investigates its role in angiogenesis in CRC and explores the regulatory mechanism. Aberrant high CX40 expression was detected in tumor tissues, which was associated with a poor prognosis in CRC patients. Elevated CX40 expression was detected in CRC cell lines as well. Conditioned medium of SW620 and HT29 cell lines was used to induce angiogenesis of human umbilical vein endothelial cells (HUVECs). CX40 knockdown in CRC cells reduced angiogenesis and mobility of HUVECs and blocked CRC cell proliferation, mobility, and survival. Following bioinformatics predictions, we validated by chromatin immunoprecipitation and luciferase assays that nuclear receptor subfamily 3 group C member 1 (NR3C1), which was poorly expressed in CRC samples, suppressed CX40 transcription. The poor NR3C1 expression was attributive to DNA hypermethylation induced by DNA methyltransferase 1 (DNMT1). Restoration of NR3C1 suppressed the pro-angiogenic effect, proliferation and survival, and tumorigenic activity of CRC cells, which were, however, rescued by CX40 upregulation. Collectively, this study demonstrates that transcription activation of CX40 upon DNMT1-mediated NR3C1 DNA methylation potentiates angiogenesis in CRC.
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Affiliation(s)
- Peng Zhai
- Department of General Surgery, The Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu, PR China; Department of General Surgery, Fifth People's Hospital of Huai'an City, Huai'an 223300, Jiangsu, PR China
| | - Heng Zhang
- Department of General Surgery, Nanjing Lishui District People's Hospital, Zhongda Hospital Lishui Branch, Southeast University, Nanjing 211200, Jiangsu, PR China
| | - Qiang Li
- Department of General Surgery, The Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu, PR China; Department of Gerneral Surgery, The Second Afilliated Hospital of Xuzhou Medical University, Xuzhou 221000, Jiangsu, PR China
| | - Ming Yang
- Department of General Surgery, Fifth People's Hospital of Huai'an City, Huai'an 223300, Jiangsu, PR China
| | - Yunhu Guo
- Department of General Surgery, Fifth People's Hospital of Huai'an City, Huai'an 223300, Jiangsu, PR China
| | - Chungen Xing
- Department of General Surgery, The Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu, PR China.
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20
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Huang KCY, Chiang SF, Lin PC, Hong WZ, Yang PC, Chang HP, Peng SL, Chen TW, Ke TW, Liang JA, Chen WTL, Chao KSC. TNFα modulates PANX1 activation to promote ATP release and enhance P2RX7-mediated antitumor immune responses after chemotherapy in colorectal cancer. Cell Death Dis 2024; 15:24. [PMID: 38195677 PMCID: PMC10776587 DOI: 10.1038/s41419-023-06408-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 12/10/2023] [Accepted: 12/21/2023] [Indexed: 01/11/2024]
Abstract
ATP and its receptor P2RX7 exert a pivotal effect on antitumor immunity during chemotherapy-induced immunogenic cell death (ICD). Here, we demonstrated that TNFα-mediated PANX1 cleavage was essential for ATP release in response to chemotherapy in colorectal cancer (CRC). TNFα promoted PANX1 cleavage via a caspase 8/3-dependent pathway to enhance cancer cell immunogenicity, leading to dendritic cell maturation and T-cell activation. Blockade of the ATP receptor P2RX7 by the systemic administration of small molecules significantly attenuated the therapeutic efficacy of chemotherapy and decreased the infiltration of immune cells. In contrast, administration of an ATP mimic markedly increased the therapeutic efficacy of chemotherapy and enhanced the infiltration of immune cells in vivo. High PANX1 expression was positively correlated with the recruitment of DCs and T cells within the tumor microenvironment and was associated with favorable survival outcomes in CRC patients who received adjuvant chemotherapy. Furthermore, a loss-of-function P2RX7 mutation was associated with reduced infiltration of CD8+ immune cells and poor survival outcomes in patients. Taken together, these results reveal that TNFα-mediated PANX1 cleavage promotes ATP-P2RX7 signaling and is a key determinant of chemotherapy-induced antitumor immunity.
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Affiliation(s)
- Kevin Chih-Yang Huang
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, 40402, Taiwan, ROC.
- Translation Research Core, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC.
- Cancer Biology and Precision Therapeutics Center, China Medical University, Taichung, 40402, Taiwan, ROC.
| | - Shu-Fen Chiang
- Lab of Precision Medicine, Feng-Yuan Hospital, Ministry of Health and Welfare, Taichung, 42055, Taiwan, ROC
| | - Pei-Chun Lin
- Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Wei-Ze Hong
- Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Pei-Chen Yang
- Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Hui-Ping Chang
- Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Shin-Lei Peng
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Tsung-Wei Chen
- Department of Pathology, Asia University Hospital, Asia University, Taichung, 41354, Taiwan, ROC
| | - Tao-Wei Ke
- School of Chinese Medicine and Graduate Institute of Chinese Medicine, China Medical University, Taichung, 40402, Taiwan, ROC
- Department of Colorectal Surgery, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
| | - Ji-An Liang
- Department of Radiation Oncology, China Medical University Hospital, China Medical University, Taichung, Taiwan, ROC
- Department of Radiotherapy, School of Medicine, China Medical University, Taichung, 40402, Taiwan, ROC
| | - William Tzu-Liang Chen
- Department of Colorectal Surgery, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC
- Department of Colorectal Surgery, China Medical University HsinChu Hospital, China Medical University, HsinChu, 302, Taiwan, ROC
- School of Medicine, China Medical University, Taichung, 40402, Taiwan, ROC
| | - K S Clifford Chao
- Proton Therapy and Science Center, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan, ROC.
- Department of Radiation Oncology, China Medical University Hospital, China Medical University, Taichung, Taiwan, ROC.
- Department of Radiotherapy, School of Medicine, China Medical University, Taichung, 40402, Taiwan, ROC.
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21
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Goyal S, Singh R, Singh JR, Vanita V. Novel and known variants in GJA3 and LIM2 in congenital cataract families from North India. BMC Genomics 2024; 25:31. [PMID: 38178039 PMCID: PMC10765620 DOI: 10.1186/s12864-023-09880-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 12/07/2023] [Indexed: 01/06/2024] Open
Abstract
BACKGROUND To identify the underlying genetic defects in autosomal dominant (ADCC) and autosomal recessive (ARCC) congenital cataract families from North India. METHODS Detailed family histories were collected, pedigrees drawn followed by slit-lamp examination and lens photography. Mutation screening was performed using Sanger sequencing in the known candidate genes for crystallins, connexins, and membrane proteins. The pathogenicity of identified variants was assessed bioinformatically. RESULTS In two ADCC families (CC-281 and CC-3015) with posterior lenticonus cataract, a novel change c.263C > T (p.P88L) in GJA3 in CC-281 family and a previously reported substitution c.388C > T (p.R130C) in LIM2 in CC-3015 family was observed. In an ARCC family (CC-3005) having central pulverulent cataract, a novel frameshift deletion (c.764delT;p.L255R46fs) in GJA3 was detected. The observed variants segregated completely with phenotypes in the affected members and were neither present in unaffected family members nor in the ethnically matched 150 controls (tested for two novel variants), hence excluding these as polymorphisms. CONCLUSIONS Present study identified two novel mutations i.e., c.263C > T;p.P88L and c.764delT;p.L255R46fs in GJA3 in an ADCC and an ARCC family having posterior lenticonus and central pulverulent cataract, respectively. In another ADCC family with posterior lenticonus cataract, a previously reported mutation c.388C > T;p.R130C in LIM2 was observed. R130 may be a mutation hotspot as previously ADCC families from different ethnicities (UK/Czechia, China, Spain, Japan) also harbored the same substitution, however, with different phenotypes i.e., nuclear pulverulent, membranous, nuclear, lamellar, and sutural/lamellar. Findings in present study thus expand the mutation spectrum and phenotypic heterogeneity linked with GJA3 and LIM2.
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Affiliation(s)
- Shiwali Goyal
- Department of Human Genetics, Guru Nanak Dev University (GNDU), Amritsar, 143005, Punjab, India
| | - Ravijit Singh
- Dr. Daljit, Singh Eye Hospital, Amritsar, 143001, Punjab, India
| | - Jai Rup Singh
- Department of Human Genetics, Guru Nanak Dev University (GNDU), Amritsar, 143005, Punjab, India
| | - Vanita Vanita
- Department of Human Genetics, Guru Nanak Dev University (GNDU), Amritsar, 143005, Punjab, India.
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22
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Yu Y, Zhang J, Zhan Y, Luo G. A novel method for detecting nine hotspot mutations of deafness genes in one tube. Sci Rep 2024; 14:454. [PMID: 38172427 PMCID: PMC10764868 DOI: 10.1038/s41598-023-50928-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 12/28/2023] [Indexed: 01/05/2024] Open
Abstract
Deafness is a common sensory disorder. In China, approximately 70% of hereditary deafness originates from four common deafness-causing genes: GJB2, SLC26A4, GJB3, and MT-RNR1. A single-tube rapid detection method based on 2D-PCR technology was established for nine mutation sites in the aforementioned genes, and Sanger sequencing was used to verify its reliability and accuracy. The frequency of hotspot mutations in deafness genes was analysed in 116 deaf students. 2D-PCR identified 27 genotypes of nine loci according to the melting curve of the FAM, HEX, and Alexa568 fluorescence channels. Of the 116 deaf patients, 12.9% (15/116) carried SLC26A4 mutations, including c.919-2A > G and c.2168A > G (allele frequencies, 7.3% and 2.2%, respectively). The positivity rate (29.3%; 34/116) was highest for GJB2 (allele frequency, 15.9% for c.235delC, 6.0% for c.299_300delAT, and 2.6% for c.176-191del16). Sanger sequencing confirmed the consistency of results between the detection methods based on 2D-PCR and DNA sequencing. Common pathogenic mutations in patients with non-syndromic deafness in Changzhou were concentrated in GJB2 (c.235delC, c.299_300delAT, and c.176-191del16) and SLC26A4 (c.919-2A > G and c.2168 A > G). 2D-PCR is an effective method for accurately and rapidly identifying deafness-related genotypes using a single-tube reaction, and is superior to DNA sequencing, which has a high cost and long cycle.
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Affiliation(s)
- Yang Yu
- Comprehensive Laboratory, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, People's Republic of China
| | - Jun Zhang
- Comprehensive Laboratory, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, People's Republic of China
| | - Yuxia Zhan
- Comprehensive Laboratory, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, People's Republic of China
| | - Guanghua Luo
- Comprehensive Laboratory, The Third Affiliated Hospital of Soochow University, Changzhou, 213003, People's Republic of China.
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Ma Z, Huang W, Xu J, Qiu J, Liu Y, Ye M, Fan S. Analysis of deafness susceptibility gene of neonates in northern Guangdong, China. Sci Rep 2024; 14:362. [PMID: 38172182 PMCID: PMC10764796 DOI: 10.1038/s41598-023-49530-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 12/08/2023] [Indexed: 01/05/2024] Open
Abstract
This study aimed to explore the molecular epidemiology characteristics of deafness susceptibility genes in neonates in northern Guangdong and provide a scientific basis for deafness prevention and control. A total of 10,183 neonates were recruited between January 2018 and December 2022 at Yuebei People's Hospital. Among these, a PCR hybridization screening group of 8276 neonates was tested for four deafness genes: GJB2, SLC26A4, mtDNA, and GJB3 by PCR hybridization. Another group used next-generation sequencing (NGS) to detect genetic susceptibility genes in 1907 neonates. In PCR hybridization screening group, 346 (4.18%) of 8276 neonates were found to be carriers of the deafness gene. Among these, 182 (2.2%) had GJB2 variants, 114 (1.38%) had SLC26A4 variants, 35 (0.42%) had mtDNA variants, and 15 (0.18%) had GJB3 variants. In NGS Screening Group, 195 out of 1907 neonates were found to be carriers of the deafness gene, with a positive rate of 10.22%. Among these, 137 (7.18%) had GJB2 variants, 41 (2.15%) had SLC26A4 variants, 11 (0.58%) had mtDNA variants, and 6 (0.31%) had GJB3 variants. The prevalence of deafness gene variants was high in Northern Guangdong Province. The most common gene for deafness was GJB2, followed by SLC26A4 and mtDNA. GJB3 variants are rare. Compared with PCR hybridization method, NGS technology can expand the screening scope and greatly improve the detection rate of deafness genes. The c.109G>A of GJB2 was found to occur at a high frequency, which should be considered. Therefore, it is important to conduct neonatal deafness gene screening to prevent and control hereditary deafness.
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Affiliation(s)
- Zhanzhong Ma
- Reproductive Medicine Center, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Wenbo Huang
- Reproductive Medicine Center, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Jing Xu
- Reproductive Medicine Center, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Jianwu Qiu
- Department of Neonatology, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Yulan Liu
- Reproductive Medicine Center, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Meixian Ye
- Department of Biobank, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China
| | - Shushu Fan
- Reproductive Medicine Center, Yuebei People's Hospital, Shantou University Medical College, Shaoguan, 512026, China.
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Wang L, Liu G, Ma D, Zeng H, Wang Y, Luo C, Zhang J, Xu Z. Next-generation sequencing for genetic testing of hearing loss populations. Clin Chim Acta 2024; 552:117693. [PMID: 38056549 DOI: 10.1016/j.cca.2023.117693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/03/2023] [Accepted: 12/03/2023] [Indexed: 12/08/2023]
Abstract
BACKGROUND AND AIMS Hearing loss is a common sensorineural disease with genetic heterogeneity. More than 140 genes are known to cause hereditary hearing loss. We aim to uncover the etiologies of hearing loss and provide patients with reasonable reproductive choices. MATERIALS AND METHODS Total 825 participants were recruited, including 74 individuals, 47 couples, and 219 families, to identify the molecular etiologies of hearing loss using next-generation sequencing (NGS). Novel mutations were verified with a minigene splicing assay and the construction of three-dimensional protein models. RESULTS A positive molecular diagnosis was obtained for 244 patients, a rate of 63.05 %. Total 470 mutations were identified in 18 causative genes in positive patients. The most common genes mutated were GJB2 and SLC26A4. 47 novel mutations were identified. Further analysis predicted that two splicing mutations would cause abnormal mRNA splicing and three missense mutations would affect the protein structure. The results of prenatal diagnosis showed that the genotypes of 15 fetuses were the same as the probands. CONCLUSION Our findings expand the mutation spectrum of hearing loss and highlight the importance of genetic diagnosis and prenatal diagnosis to allow accurate and personalized guidance for those at high risk of deafness.
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Affiliation(s)
- Lulu Wang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Gang Liu
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Dingyuan Ma
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Huasha Zeng
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Yuguo Wang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Chunyu Luo
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China
| | - Jingjing Zhang
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China.
| | - Zhengfeng Xu
- Department of Prenatal Diagnosis, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, Jiangsu, China.
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25
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Xiong Y, Chen M, Wang H, Chen L, Huang H, Xu L. Mutation analysis of GJB2, SLC26A4, GJB3 and mtDNA12SrRNA genes in 251 non-syndromic hearing loss patients in Fujian, China. Int J Pediatr Otorhinolaryngol 2024; 176:111777. [PMID: 38029595 DOI: 10.1016/j.ijporl.2023.111777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/23/2023] [Accepted: 11/03/2023] [Indexed: 12/01/2023]
Abstract
OBJECTIVES The molecular etiology of non-syndromic hearing loss (NSHL) in Southeastern China (Fujian) has not been precisely identified. our study selected patients with NSHL and analyzed their causative genes, which helped to improve the accuracy of the diagnosis of hereditary hearing loss (HHL) and its treatment. METHODS 251 unrelated patients who attended the otolaryngology clinic of Fujian Maternal and Child Health Hospital with hearing loss were enrolled to our study. All patients had genetic tests and listening tests, of which 251 were diagnosed with NSHL. In addition, we used whole-exome sequencing (WES) in a patient who has a significant family history of HHL but negative for gene chip testing, as well as in his family members. RESULT Among of 251 patients, Nucleotide changes were found in 63 cases (25.09%), including 34 located in GJB2(13.5%, including 235delC and 299_300delAT), 13 located in SLC26A4(5.18%, including c.919-2G > A and 2168 A > G), 1 located in GJB3(0.4%,538C > T) and 16 located in mtDNA12SrRNA (6.37%,1555 A > G). In addition, we discuss the process of identifying novel PLS1 mutations from 251 patients. CONCLUSION Our results demonstrate the conventional deafness gene mutation in 251 NSHL patients in Fujian, China. Compared with the other area of China, we have a lower detection rate, but GJB2 235delC remains the most common mutation in Fujian. In addition, we discuss the process of discovering novel mutation locus for deafness, which provides an understanding for deafness diagnosis and genetic testing.
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Affiliation(s)
- Yikang Xiong
- The Frist Department of Clinical Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, Fujian Province, China
| | - Meihuan Chen
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Haiwei Wang
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Lingji Chen
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China
| | - Hailong Huang
- Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China.
| | - Liangpu Xu
- The Frist Department of Clinical Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, Fujian Province, China; Medical Genetic Diagnosis and Therapy Center of Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian Provincial Key Laboratory of Prenatal Diagnosis and Birth Defect, Fuzhou, 350001, Fujian Province, China.
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Tettey-Matey A, Di Pietro C, Donati V, Mammano F, Marazziti D. Generation of Connexin-Expressing Stable Cell Pools. Methods Mol Biol 2024; 2801:147-176. [PMID: 38578420 DOI: 10.1007/978-1-0716-3842-2_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Stable cell pools have the advantage of providing a definite, consistent, and reproducible transmission of a transgene of interest, compared to transient expression from a plasmid transfection. Stably expressing a transgene of interest in cells under induction is a powerful way to (switch on and) study a gene function in both in vitro and in vivo assays. Taking advantage of the ability of lentivirus (LV) to promote transgene delivery, and genomic integration and expression in both dividing and nondividing cells, a doxycycline-inducible transfer vector expressing a bicistronic transgene was developed to study the function of connexins in HeLa DH cells. Here, delving on connexin 32 (Cx32), we report how to use the backbone of this vector as a tool to generate stable pools to study the function of a gene of interest (GOI), especially with assays involving Ca2+ imaging, employing the GCaMP6s indicator. We describe a step-by-step protocol to produce the LV particle by transient transfection and the direct use of the harvested LV stock to generate stable cell pools. We further present step-by-step immunolabeling protocols to characterize the transgene protein expression by confocal microscopy using an antibody that targets an extracellular domain epitope of Cx32 in living cells, and in fixed permeabilized cells using high affinity anti-Cx32 antibodies. Using common molecular biology laboratory techniques, this protocol can be adapted to generate stable pools expressing any transgene of interest, for both in vitro and in vivo functional assays, including molecular, immune, and optical assays.
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Affiliation(s)
- Abraham Tettey-Matey
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy
| | - Chiara Di Pietro
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy
| | - Viola Donati
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Fabio Mammano
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy
- Department of Physics and Astronomy "G. Galilei", University of Padova, Padova, Italy
| | - Daniela Marazziti
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy.
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Nardin C, Mammano F. Measurement of Ca 2+ Uptake Through Connexin Hemichannels. Methods Mol Biol 2024; 2801:97-109. [PMID: 38578416 DOI: 10.1007/978-1-0716-3842-2_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Increasing evidence points to deregulated flux of ionized calcium (Ca2+) mediated by hyperactive mutant connexin (Cx) hemichannels (HCs) as a common gain-of-function etiopathogenetic mechanism for several diseases, ranging from skin disorders to nervous system defects. Furthermore, the opening of nonmutated Cx HCs is associated with an impressive list of widespread diseases including, but not limited to, ischemia/stroke, Alzheimer's disease, and epilepsy. HC inhibitors are attracting a growing attention due to their therapeutic potential for numerous pathologies. This chapter describes a quantitative method to measure Ca2+ uptake though HCs expressed in cultured cells. The assay we developed can be used to probe HC activity as wells as to test HC inhibitors. Furthermore, with minor changes it can be easily adapted to high-throughput high-content platforms and/or primary cells and microtissues.
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Affiliation(s)
- Chiara Nardin
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy
- , Genoa, Italy
| | - Fabio Mammano
- Institute of Biochemistry and Cell Biology, Italian National Research Council, Rome, Italy.
- Department of Physics and Astronomy "G. Galilei", University of Padova, Padova, Italy.
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Zhou L, Wang G, Hu B, Jiang H, Jiang F, Xu Z. Microphthalmia and anterior segment dysgenesis due to a double gene variant in GJA8 and CRYGC. Eur J Ophthalmol 2024; 34:NP12-NP17. [PMID: 36916241 DOI: 10.1177/11206721231163611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
INTRODUCTION To report a family with severe ocular disorder caused by double gene variants in causative genes of autosomal dominant cataracts, GJA8 and CRYGC. CASE PRESENTATION A 5-month-old boy with poor vision and enophthalmos was referred to our hospital. Further ocular examination showed horizontal nystagmus, iris abnormalities with pinpoint pupils, and extreme microphthalmia with axial right and left eye lengths of 13.48 mm and 13.75 mm, respectively. Digenic heterozygous variants (c.269T > G, p.Leu90Arg in CRYGC and c.151G > A, p.Asp51Asn in GJA8) have been detected based on the whole exome sequencing. His mother, who carried variant in CRYGC (c.269T > G, p.Leu90Arg), had nuclear cataract, microcornea and nystagmus, while his father, who carried variant in GJA8 (c.151G > A, p.Asp51Asn), showed bilateral membranous cataract, microphthalmia, sclerocornea, glaucoma, and nystagmus. CONCLUSIONS To our knowledge, this is the first report of a patient with variants in two cataract-related genes. Importantly, patient with double heterozygous variants in two dominantly inherited genes may suffer more serious phenotypes than those with heterozygous variant in a single dominantly inherited gene. Whole exome or genome sequencing is necessary for a genetic diagnosis in case of multiple gene variants.
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Affiliation(s)
- Lin Zhou
- Department of ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Ganghua Wang
- Department of ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Bin Hu
- Department of ophthalmology, Chengdu tianfu new district people's hospital, Chengdu, 641400, China
| | - Hui Jiang
- Department of ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Fanwen Jiang
- Department of ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Zhuping Xu
- Department of ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
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Kun L, Jiexiang H, Hua L, Junlin H, Yijun R, Lixian Z, Mingqiao C. Genetic screening of 15 hearing loss variants in 77,647 neonates with clinical follow-up. Mol Genet Genomic Med 2024; 12:e2324. [PMID: 38037722 PMCID: PMC10767602 DOI: 10.1002/mgg3.2324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 11/03/2023] [Accepted: 11/10/2023] [Indexed: 12/02/2023] Open
Abstract
BACKGROUND To analyze the genotype distribution and frequency of hearing loss genes in newborn population and evaluate the clinical value of genetic screening policy in China. METHODS Genetic screening for hearing loss was offered to 84,029 neonates between March 2019 and December 2021, of whom 77,647 newborns accepted the screening program with one-year follow-up. The genotyping of 15 hot spot variants in GJB2, GJB3, SLC26A4, and MT-RNR1 was performed on microarray platform. RESULTS A total of 3.05% (2369/77,647) newborns carried at least one genetic hearing loss-associated variant, indicated for early preventive management. The carrier frequency of GJB2 gene was the highest, at 1.48% (1147/77,647), followed by SLC26A4 gene at 1.07% (831/77,647), and GJB3 gene at 0.23% (181/77,647). GJB2 c.235delC variant and SLC26A4 IVS7-2A>G variant were the most common allelic variants with allele frequency of 0.6304% (979/155,294) and 0.3992% (620/155,294), respectively. 10 children are identified as homozygous or compound heterozygous for pathogenic variants (4 in GJB2, 6 in SLC26A4), and 7 of these infants had passed the hearing screening. Following up of the genetically screened newborns revealed that genetic screening detected more hearing-impaired infants than hearing screening alone. Genetic screening helped identify the infants who had passed the initial hearing screening, and reduced time for diagnosis and intervention of hearing aid. In addition, we identified 234 newborns (0.30%, 234/77,647) susceptible to preventable aminoglycoside antibiotic ototoxicity undetectable by hearing screening. CONCLUSION We performed the largest-scale neonatal carrier screening for hearing loss genes in Southeast China. Our results indicated that genetic screening is an important complementation to conventional hearing screening. Our practice and experience may facilitate the application and development of neonatal genetic screening policy in mainland China.
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Affiliation(s)
- Lin Kun
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
| | - Huang Jiexiang
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
| | - Lin Hua
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
| | - Han Junlin
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
| | - Ruan Yijun
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
| | - Zhang Lixian
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
| | - Chen Mingqiao
- Prenatal Diagnosis Center, The Affiliated Hospital of Putian UniversityPutian UniversityPutianChina
- Newborn Screening CenterPutian Maternity and Child Health Care HospitalPutianChina
- Department of PediatricsPutian Maternity and Child Health Care HospitalPutianChina
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Li Y, Wang H, Li D, Wang Q. [Distribution characteristics and correlation analysis of GJB2 variation in patients with auditory neuropathy]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2024; 38:23-29. [PMID: 38297845 DOI: 10.13201/j.issn.2096-7993.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Indexed: 02/02/2024]
Abstract
Objective:To elucidate the correlation between the GJB2 gene and auditory neuropathy, aiming to provide valuable insights for genetic counseling of affected individuals and their families. Methods:The general information, audiological data(including pure tone audiometry, distorted otoacoustic emission, auditory brainstem response, electrocochlography), imaging data and genetic test data of 117 auditory neuropathy patients, and the patients with GJB2 gene mutation were screened out for the correlation analysis of auditory neuropathy. Results:Total of 16 patients were found to have GJB2 gene mutations, all of which were pathogenic or likely pathogenic.was Among them, one patient had compound heterozygous variants GJB2[c. 427C>T][c. 358_360del], exhibiting total deafness. One was GJB2[c. 299_300delAT][c. 35_36insG]compound heterozygous variants, the audiological findings were severe hearing loss.The remaining 14 patients with GJB2 gene variants exhibited typical auditory neuropathy. Conclusion:In this study, the relationship between GJB2 gene and auditory neuropathy was preliminarily analyzed,and explained the possible pathogenic mechanism of GJB2 gene variants that may be related to auditory neuropathy.
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Affiliation(s)
- Yiming Li
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery Department of Otolaryngology,the Sixth Medical Centre,Chinese PLA General Hospital,Medical School of Chinese PLA,Beijing,100048,China
- National Clinical Medical Center for Otolaryngology
| | - Hongyang Wang
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery Department of Otolaryngology,the Sixth Medical Centre,Chinese PLA General Hospital,Medical School of Chinese PLA,Beijing,100048,China
- National Clinical Medical Center for Otolaryngology
| | - Danyang Li
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery Department of Otolaryngology,the Sixth Medical Centre,Chinese PLA General Hospital,Medical School of Chinese PLA,Beijing,100048,China
- National Clinical Medical Center for Otolaryngology
| | - Qiuju Wang
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery Department of Otolaryngology,the Sixth Medical Centre,Chinese PLA General Hospital,Medical School of Chinese PLA,Beijing,100048,China
- National Clinical Medical Center for Otolaryngology
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Bayraktar E, Bortolozzi M. Measuring Connexin Hemichannel Opening in Response to an InsP3-Mediated Cytosolic Ca 2+ Increase. Methods Mol Biol 2024; 2801:189-197. [PMID: 38578422 DOI: 10.1007/978-1-0716-3842-2_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
The opening of connexin hemichannels (HCs) expressed at the plasma membrane of mammalian cells is regulated by a number of physiological parameters, including extracellular and intracellular Ca2+ ions. Submicromolar variations of the cytosolic Ca2+ concentration ([Ca2+]c) are per se sufficient to trigger extracellular bursts of messenger molecules through connexin HCs, thus mediating paracrine signaling. In this chapter, we present a quantitative method to measure the opening dynamics of connexin HCs expressed in a single HeLa cell upon stimulation by a canonical InsP3-mediated [Ca2+]c transient. The protocol relies on a combination of Ca2+ imaging and patch-clamp techniques. The insights gained from our method are expected to make a significant contribution to understanding the structure-function relationship of connexin HCs. The protocol is also suitable to screen candidate therapeutic compounds to treat connexin-related diseases linked to HC dysfunction.
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Affiliation(s)
- Erva Bayraktar
- Department of Physics and Astronomy "G. Galilei", University of Padua, Padova, Italy
- Veneto Institute of Molecular Medicine (VIMM), Padova, Italy
| | - Mario Bortolozzi
- Department of Physics and Astronomy "G. Galilei", University of Padua, Padova, Italy.
- Veneto Institute of Molecular Medicine (VIMM), Padova, Italy.
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Martins-Marques T, Girão H. Expression and Function of Connexins in Extracellular Vesicles. Methods Mol Biol 2024; 2801:17-28. [PMID: 38578410 DOI: 10.1007/978-1-0716-3842-2_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Extracellular vesicles (EVs) are recognized as major vehicles for exchange of information across distant cells and tissues, which have been extensively explored for diagnosis and therapeutic purposes. The presence of multiple connexin (Cx) proteins has been described in EVs, where they might facilitate EV-cell communication. However, quantitative changes in Cx levels and functional assessment of Cx channels have only been established for Cx43. In present work, we provide a detailed description of the protocols we have optimized to assess the expression and permeability of Cx43 channels in EVs derived from cultured cells and human peripheral blood. Particularly, we include some modifications to improve quantitative analysis of EV-Cx43 by enzyme-linked immunosorbent assay (ELISA) and assessment of channel functionality by sucrose-density gradient ultracentrifugation, which can be easily adapted to other Cx family members, leveraging the development of diagnostic and therapeutic applications based on Cx-containing EVs.
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Affiliation(s)
- Tânia Martins-Marques
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, Coimbra, Portugal.
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Coimbra, Portugal.
- Clinical Academic Centre of Coimbra (CACC), Coimbra, Portugal.
| | - Henrique Girão
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, Coimbra, Portugal
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Coimbra, Portugal
- Clinical Academic Centre of Coimbra (CACC), Coimbra, Portugal
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Fiori MC, Altenberg GA. Purification, Reconstitution, and Functional Analysis of Connexin Hemichannels. Methods Mol Biol 2024; 2801:1-16. [PMID: 38578409 DOI: 10.1007/978-1-0716-3842-2_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Connexins are the proteins that form the gap junction channels that are essential for cell-to-cell communication. These channels are formed by head-to-head docking of hemichannels (each from one of two adjacent cells). Free "undocked" hemichannels at the plasma membrane are mostly closed, although they are still important under physiological conditions. However, abnormal and sustained increase in hemichannel activity due to connexin mutations or acquired conditions can produce or contribute to cell damage. For example, mutations of Cx26, a connexin isoform, can increase hemichannel activity and cause deafness. Studies using purified isolated systems under well-controlled conditions are essential for a full understanding of molecular mechanisms of hemichannel function under normal conditions and in disease, and here, we present methodology for the expression, purification, and functional analysis of hemichannels formed by Cx26.
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Affiliation(s)
- Mariana C Fiori
- Clinical Research Institute, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Guillermo A Altenberg
- Department of Cell Physiology and Molecular Biophysics, and Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, TX, USA.
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Zhou R, Guan J, Wang Q. [Genetic characteristic analysis of slight-to-moderate sensorineural hearing loss in children]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2024; 38:18-22. [PMID: 38297844 DOI: 10.13201/j.issn.2096-7993.2024.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Indexed: 02/02/2024]
Abstract
Objective:To analyze genetic factors and phenotype characteristics in pediatric population with slight-to-moderate sensorineural hearing loss. Methods:Children with slight-to-moderate sensorineural hearing loss of and their parents, enrolled from the Chinese Deafness Genome Project, were studied. Hearing levels were assessed using pure tone audiometry, behavioral audiometry, auditory steady state response(ASSR), auditory brainstem response(ABR) thresholds, and deformed partial otoacoustic emission(DPOAE). Classification of hearing loss is according to the 2022 American College of Medical Genetics and Genomics(ACMG) Clinical Practice Guidelines for Hearing Loss. Whole exome sequencing(WES) and deafness gene Panel testing were performed on peripheral venous blood from probands and validations were performed on their parents by Sanger sequencing. Results:All 134 patients had childhood onset, exhibiting bilateral symmetrical slight-to-moderate sensorineural hearing loss, as indicated by audiological examinations. Of the 134 patients, 29(21.6%) had a family history of hearing loss, and the rest were sporadic patients. Genetic causative genes were identified in 66(49.3%) patients. A total of 11 causative genes were detected, of which GJB2 was causative in 34 cases(51.5%), STRC in 10 cases(15.1%), MPZL2 gene in six cases(9.1%), and USH2A in five cases(7.6%).The most common gene detected in slight-to-moderate hearing loss was GJB2, with c. 109G>A homozygous mutation found in 16 cases(47.1%) and c. 109G>A compound heterozygous mutation in 9 cases(26.5%). Conclusion:This study provides a crucial genetic theory reference for early screening and detection of mild to moderate hearing loss in children, highlighting the predominance of recessive inheritance and the significance of gene like GJB2, STRC, MPZL2, USH2A.
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Affiliation(s)
- Rui Zhou
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery,Chinese PLA General Hospital
- National Clinical Research Center for Otolaryngologic Diseases
| | - Jing Guan
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery,Chinese PLA General Hospital
- National Clinical Research Center for Otolaryngologic Diseases
| | - Qiuju Wang
- Department of Audiology and Vestibular Medicine,College of Otolaryngology Head and Neck Surgery,Chinese PLA General Hospital
- National Clinical Research Center for Otolaryngologic Diseases
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Fernandez-Olivares A, Retamal MA. Protocol for the Study of Connexin and DNA Interactions. Methods Mol Biol 2024; 2801:125-134. [PMID: 38578418 DOI: 10.1007/978-1-0716-3842-2_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Connexins (Cxs) are transmembrane proteins which form hemichannels and gap junction channels at the plasma membrane. These channels allow the exchange of ions and molecules between the intra- and extracellular space and between cytoplasm of adjacent cells, respectively. The channel function of Cx assemblies has been extensively studied; however, "noncanonical" functions have emerged in the last few decades and have capture the attentions of many researchers, including the role of some Cxs as gene modulators or transcription factors. In this chapter, we describe a protocol to study the interaction of Cx46 with DNA in HeLa cells. These methods can facilitate understanding the role of Cxs in physiological processes and pathological mechanisms, including, for example, the contribution of Cx46 in maintaining stemness of glioma cancer stem cells.
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Affiliation(s)
- Ainoa Fernandez-Olivares
- Programa de Comunicación Celular en Cáncer, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile
| | - Mauricio A Retamal
- Programa de Comunicación Celular en Cáncer, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile.
- Programa de Comunicación Celular en Cáncer, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile.
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Palacios-Prado N, Vergara T, Sáez JC. Enhanced Methodologies for Investigating the Electrophysiological Characteristics of Endogenous Pannexin 1 Intercellular Cell-Cell Channels. Methods Mol Biol 2024; 2801:135-145. [PMID: 38578419 DOI: 10.1007/978-1-0716-3842-2_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Gap junctions, pivotal intercellular conduits, serve as communication channels between adjacent cells, playing a critical role in modulating membrane potential distribution across cellular networks. The family of Pannexin (Panx) proteins, in particular Pannexin1 (Panx1), are widely expressed in vertebrate cells and exhibit sequence homology with innexins, the invertebrate gap junction channel constituents. Despite being ubiquitously expressed, detailed functional and pharmacological properties of Panx1 intercellular cell-cell channels require further investigation. In this chapter, we introduce optimized cell culture methodologies and electrophysiology protocols to expedite the exploration of endogenous Panx1 cell-cell channels in TC620 cells, a human oligodendroglioma cell line that naturally expresses Panx1. We anticipate these refined protocols will significantly contribute to future characterizations of Panx1-based intercellular cell-cell channels across diverse cell types and offer valuable insights into both normal cellular physiology and pathophysiology.
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Affiliation(s)
- Nicolás Palacios-Prado
- Laboratorio de Neurobiología, Departamento de Fisiología, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Teresa Vergara
- Laboratorio de Neurobiología, Departamento de Fisiología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan C Sáez
- Centro Interdisciplinario de Neurociencias de Valparaíso, Instituto de Neurociencias, Universidad de Valparaíso, Valparaíso, Chile
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Du Y, Acosta FM, Zhang J, Tong Y, Quan Y, Gu S, Jiang JX. Protocol for altering connexin hemichannel function in primary chicken lens fiber cells using high-titer retroviral RCAS(A) infection. STAR Protoc 2023; 4:102564. [PMID: 37738121 PMCID: PMC10519848 DOI: 10.1016/j.xpro.2023.102564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 07/05/2023] [Accepted: 08/18/2023] [Indexed: 09/24/2023] Open
Abstract
Connexins (Cxs) play a crucial role in maintaining lens transparency. Here, we present a protocol for altering Cx hemichannel (HC) function in primary chicken lens fiber cells using high-titer retroviral replication competent avian sarcoma-leukosis virus long terminal repeat with splice acceptor (A) infection. We describe steps for incubating eggs, isolating lenses, culturing cells, preparing reagents, and infecting cells. We then detail cell treatment and detection of apoptosis and death. This protocol can assess protein kinase A, HC activity, and increased glutathione transport for protecting lens fiber cells against oxidative stress. For complete details on the use and execution of this protocol, please refer to Liu et al.,1 Riquelme et al.,2 Shi et al.,3 Jiang,4 and Rath et al.5.
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Affiliation(s)
- Yu Du
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA; Department of Ophthalmology, Lanzhou University Second Hospital; Second Clinical School, Lanzhou University, Lanzhou, Gansu 730000, China.
| | - Francisca M Acosta
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
| | - Jianping Zhang
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
| | - Yuxin Tong
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
| | - Yumeng Quan
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
| | - Sumin Gu
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
| | - Jean X Jiang
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA.
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Cibelli A, Dohare P, Spray DC, Scemes E. Differential activation of mouse and human Panx1 channel variants. PLoS One 2023; 18:e0295710. [PMID: 38100403 PMCID: PMC10723736 DOI: 10.1371/journal.pone.0295710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/22/2023] [Indexed: 12/17/2023] Open
Abstract
Pannexins are ubiquitously expressed in human and mouse tissues. Pannexin 1 (Panx1), the most thoroughly characterized member of this family, forms plasmalemmal membrane channels permeable to relatively large molecules, such as ATP. Although human and mouse Panx1 amino acid sequences are conserved in the presently known regulatory sites involved in trafficking and modulation of the channel, differences are reported in the N- and C-termini of the protein, and the mechanisms of channel activation by different stimuli remain controversial. Here we used a neuroblastoma cell line to study the activation properties of endogenous mPanx1 and exogenously expressed hPanx1. Dye uptake and electrophysiological recordings revealed that in contrast to mouse Panx1, the human ortholog is insensitive to stimulation with high extracellular [K+] but responds similarly to activation of the purinergic P2X7 receptor. The two most frequent Panx1 polymorphisms found in the human population, Q5H (rs1138800) and E390D (rs74549886), exogenously expressed in Panx1-null N2a cells revealed that regarding P2X7 receptor mediated Panx1 activation, the Q5H mutant is a gain of function whereas the E390D mutant is a loss of function variant. Collectively, we demonstrate differences in the activation between human and mouse Panx1 orthologs and suggest that these differences may have translational implications for studies where Panx1 has been shown to have significant impact.
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Affiliation(s)
- Antonio Cibelli
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York, New York, United States of America
| | - Preeti Dohare
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York, New York, United States of America
| | - David C. Spray
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York, New York, United States of America
| | - Eliana Scemes
- Department of Cell Biology & Anatomy, New York Medical College, Valhalla, New York, United States of America
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O'Donnell BL, Penuela S. Skin in the game: pannexin channels in healthy and cancerous skin. Biochem J 2023; 480:1929-1949. [PMID: 38038973 DOI: 10.1042/bcj20230176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/15/2023] [Accepted: 11/20/2023] [Indexed: 12/02/2023]
Abstract
The skin is a highly organized tissue composed of multiple layers and cell types that require coordinated cell to cell communication to maintain tissue homeostasis. In skin cancer, this organized structure and communication is disrupted, prompting the malignant transformation of healthy cells into melanoma, basal cell carcinoma or squamous cell carcinoma tumours. One such family of channel proteins critical for cellular communication is pannexins (PANX1, PANX2, PANX3), all of which are present in the skin. These heptameric single-membrane channels act as conduits for small molecules and ions like ATP and Ca2+ but have also been shown to have channel-independent functions through their interacting partners or action in signalling pathways. Pannexins have diverse roles in the skin such as in skin development, aging, barrier function, keratinocyte differentiation, inflammation, and wound healing, which were discovered through work with pannexin knockout mice, organotypic epidermis models, primary cells, and immortalized cell lines. In the context of cutaneous cancer, PANX1 is present at high levels in melanoma tumours and functions in melanoma carcinogenesis, and both PANX1 and PANX3 expression is altered in non-melanoma skin cancer. PANX2 has thus far not been implicated in any skin cancer. This review will discuss pannexin isoforms, structure, trafficking, post-translational modifications, interactome, and channel activity. We will also outline the expression, localization, and function of pannexin channels within the diverse cell types of the epidermis, dermis, hypodermis, and adnexal structures of the skin, and how these properties are exploited or abrogated in instances of skin cancer.
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Affiliation(s)
- Brooke L O'Donnell
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada N6A 5C1
| | - Silvia Penuela
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada N6A 5C1
- Department of Oncology, Division of Experimental Oncology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada N6A 5C1
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Espírito Santo SG, Da Silva TC, Cogliati B, Barbisan LF, Romualdo GR. Panx1 knockout promotes preneoplastic aberrant crypt foci development in a chemically induced model of mouse colon carcinogenesis. Int J Exp Pathol 2023; 104:304-312. [PMID: 37594023 PMCID: PMC10652697 DOI: 10.1111/iep.12491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/18/2023] [Accepted: 08/03/2023] [Indexed: 08/19/2023] Open
Abstract
Colorectal cancer, which is the third leading cause of cancer-related deaths worldwide, is a multistep disease, featuring preneoplastic aberrant crypt foci (ACF) as the early morphological manifestation. The roles of hemichannel-forming transmembrane Pannexin 1 (Panx1) protein have not been investigated in the context of colon carcinogenesis yet, although it has contrasting roles in other cancer types. Thus, this study was conducted to examine the effects of Panx1 knockout (Panx1-/- ) on the early events of chemically induced colon carcinogenesis in mouse. Wild type (WT) and Panx1-/- female C57BL6J mice were submitted to a chemically induced model of colon carcinogenesis by receiving six intraperitoneal administrations of 1,2-dimethylhydrazine (DMH) carcinogen. Animals were euthanized 8 h (week 7) or 30 weeks (week 37) after the last DMH administration in order to evaluate sub-acute colon toxicity outcomes or the burden of ACF, respectively. At week 7, Panx1 genetic ablation increased DMH-induced genotoxicity in peripheral blood cells, malondialdehyde levels in the colon, and apoptosis (cleaved caspase-3) in colonic crypts. Of note, at week 37, Panx1-/- animals showed an increase in aberrant crypts (AC), ACF mean number, and ACF multiplicity (AC per ACF) by 56%, 57% and 20%, respectively. In essence, our findings indicate that Panx1 genetic ablation promotes preneoplastic ACF development during chemically induced mouse colon carcinogenesis, and a protective role of Panx1 is postulated.
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Affiliation(s)
- Sara Gomes Espírito Santo
- Botucatu Medical School, Experimental Research Unit (UNIPEX), Multimodel Drug Screening Platform – Laboratory of Chemically Induced and Experimental Carcinogenesis (MDSP‐LCQE)São Paulo State University (UNESP)BotucatuSão Paulo StateBrazil
| | - Tereza Cristina Da Silva
- School of Veterinary Medicine and Animal Science, Department of PathologyUniversity of São Paulo (USP)São PauloSão Paulo StateBrazil
| | - Bruno Cogliati
- School of Veterinary Medicine and Animal Science, Department of PathologyUniversity of São Paulo (USP)São PauloSão Paulo StateBrazil
| | - Luís Fernando Barbisan
- Botucatu Medical School, Experimental Research Unit (UNIPEX), Multimodel Drug Screening Platform – Laboratory of Chemically Induced and Experimental Carcinogenesis (MDSP‐LCQE)São Paulo State University (UNESP)BotucatuSão Paulo StateBrazil
- Biosciences Institute, Department of Structural and Functional BiologySão Paulo State University (UNESP)São Paulo StateBrazil
| | - Guilherme Ribeiro Romualdo
- Botucatu Medical School, Experimental Research Unit (UNIPEX), Multimodel Drug Screening Platform – Laboratory of Chemically Induced and Experimental Carcinogenesis (MDSP‐LCQE)São Paulo State University (UNESP)BotucatuSão Paulo StateBrazil
- Biosciences Institute, Department of Structural and Functional BiologySão Paulo State University (UNESP)São Paulo StateBrazil
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Frederiksen SD, Wicki-Stordeur LE, Swayne LA. Overlap in synaptic neurological condition susceptibility pathways and the neural pannexin 1 interactome revealed by bioinformatics analyses. Channels (Austin) 2023; 17:2253102. [PMID: 37807670 PMCID: PMC10563626 DOI: 10.1080/19336950.2023.2253102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 08/22/2023] [Indexed: 10/10/2023] Open
Abstract
Many neurological conditions exhibit synaptic impairments, suggesting mechanistic convergence. Additionally, the pannexin 1 (PANX1) channel and signaling scaffold is linked to several of these neurological conditions and is an emerging regulator of synaptic development and plasticity; however, its synaptic pathogenic contributions are relatively unexplored. To this end, we explored connections between synaptic neurodevelopmental disorder and neurodegenerative disease susceptibility genes discovered by genome-wide association studies (GWASs), and the neural PANX1 interactome (483 proteins) identified from mouse Neuro2a (N2a) cells. To identify shared susceptibility genes, we compared synaptic suggestive GWAS candidate genes amongst autism spectrum disorders, schizophrenia, Parkinson's disease, and Alzheimer's disease. To further probe PANX1 signaling pathways at the synapse, we used bioinformatics tools to identify PANX1 interactome signaling pathways and protein-protein interaction clusters. To shed light on synaptic disease mechanisms potentially linking PANX1 and these four neurological conditions, we performed additional cross-analyses between gene ontologies enriched for the PANX1 synaptic and disease-susceptibility gene sets. Finally, to explore the regional specificity of synaptic PANX1-neurological condition connections, we identified brain region-specific elevations of synaptic PANX1 interactome and GWAS candidate gene set transcripts. Our results confirm considerable overlap in risk genes for autism spectrum disorders and schizophrenia and identify potential commonalities in genetic susceptibility for neurodevelopmental disorders and neurodegenerative diseases. Our findings also pinpointed novel putative PANX1 links to synaptic disease-associated pathways, such as regulation of vesicular trafficking and proteostasis, warranting further validation.
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Affiliation(s)
| | | | - Leigh Anne Swayne
- Division of Medical Sciences, University of Victoria, Victoria, BC, Canada
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Aihara K, Nakazawa Y, Takeda S, Hatsusaka N, Onouchi T, Hiramatsu N, Nagata M, Nagai N, Funakoshi-Tago M, Yamamoto N, Sasaki H. Aquaporins contribute to vacuoles formation in Nile grass type II diabetic rats. Med Mol Morphol 2023; 56:274-287. [PMID: 37493821 DOI: 10.1007/s00795-023-00365-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/09/2023] [Indexed: 07/27/2023]
Abstract
Regulation of ion and water microcirculation within the lens is tightly controlled through aquaporin channels and connexin junctions. However, cataracts can occur when the lens becomes cloudy. Various factors can induce cataracts, including diabetes which is a well-known cause. The most common phenotype of diabetic cataracts is a cortical and/or posterior subcapsular opacity. In addition to the three main types and two subtypes of cataracts, a vacuole formation is frequently observed; however, their origin remains unclear. In this study, we focused on the aquaporins and connexins involved in diabetes-induced cataracts and vacuoles in Nile grass type II diabetes. The results showed that the expression of aquaporin 0 and aquaporin 5 increased, and that of connexin 43 decreased in diabetic rat lenses. Additionally, aquaporin 0 and 5 were strongly localized in peripheral of vacuoles, suggesting that aquaporins are involved in vacuoles formation. Transillumination photography revealed large vacuoles at the tip of the Y-suture in the anterior capsule of the diabetic lens, and several small vacuoles were observed in the posterior capsule. Within the vacuoles, cytoplasmic degradation and aggregation of fibrous material were observed. Our findings suggest that aquaporins are potential candidate proteins for preventing vacuole formation.
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Affiliation(s)
- Kana Aihara
- Faculty of Pharmacy, Keio University, 1-5-30, Shibako-en, Minato-ku, Tokyo, 105-8512, Japan
| | - Yosuke Nakazawa
- Faculty of Pharmacy, Keio University, 1-5-30, Shibako-en, Minato-ku, Tokyo, 105-8512, Japan.
| | - Shun Takeda
- Department of Ophthalmology, Kanazawa Medical University, 1-1 Daigaku Uchinada-machi, Kahoku-gun, Kahoku, Ishikawa, 920-0293, Japan
| | - Natsuko Hatsusaka
- Department of Ophthalmology, Kanazawa Medical University, 1-1 Daigaku Uchinada-machi, Kahoku-gun, Kahoku, Ishikawa, 920-0293, Japan
| | - Takanori Onouchi
- Research Promotion Headquarters, Fujita Health University, Toyoake, Aichi, 470-1192, Japan
| | - Noriko Hiramatsu
- Research Promotion Headquarters, Fujita Health University, Toyoake, Aichi, 470-1192, Japan
| | - Mayumi Nagata
- Department of Ophthalmology, Dokkyo Medical University, Shimotsugagun, Tochigi, 321-0293, Japan
| | - Noriaki Nagai
- Faculty of Pharmacy, Kindai University, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Megumi Funakoshi-Tago
- Faculty of Pharmacy, Keio University, 1-5-30, Shibako-en, Minato-ku, Tokyo, 105-8512, Japan
| | - Naoki Yamamoto
- Research Promotion Headquarters, Fujita Health University, Toyoake, Aichi, 470-1192, Japan
| | - Hiroshi Sasaki
- Department of Ophthalmology, Kanazawa Medical University, 1-1 Daigaku Uchinada-machi, Kahoku-gun, Kahoku, Ishikawa, 920-0293, Japan.
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Sakata A, Kashio A, Koyama M, Urata S, Koyama H, Yamasoba T. Hearing and Hearing Loss Progression in Patients with GJB2 Gene Mutations: A Long-Term Follow-Up. Int J Mol Sci 2023; 24:16763. [PMID: 38069086 PMCID: PMC10705933 DOI: 10.3390/ijms242316763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 11/19/2023] [Accepted: 11/23/2023] [Indexed: 12/18/2023] Open
Abstract
We aimed to investigate whether the degree of hearing loss with GJB2 mutations could be predicted by distinguishing between truncating and non-truncating mutations and whether the genotype could predict the hearing loss level. Additionally, we examined the progression of hearing loss in individuals monitored for over 2 years for an average of 6.9 years. The proportion of truncating mutations was higher in patients with profound and severe hearing loss, but it was not accurate enough to predict the degree of hearing loss. Via genotype analysis, mutations of the p.Arg143Trp variants were associated with profound hearing loss, while mutations of the p.Leu79Cysfs*3 allele exhibited a wide range of hearing loss, suggesting that specific genotypes can predict the hearing loss level. Notably, there were only three cases of progression in four ears, all of which involved the p.Leu79Cysfs*3 mutation. Over the long-term follow-up, 4000 Hz was significant, and there was a trend of progression at 250 Hz, suggesting that close monitoring at these frequencies during follow-up may be crucial to confirm progression. The progression of hearing loss was observed in moderate or severe hearing loss cases at the time of the initial diagnosis, emphasizing that children with this level of hearing loss need regular follow-ups.
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Affiliation(s)
- Aki Sakata
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Akinori Kashio
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Misaki Koyama
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Shinji Urata
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Hajime Koyama
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Tatsuya Yamasoba
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
- Tokyo Teishin Hospital, Tokyo 102-0071, Japan
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Zhao M, Luo X, Zhao Q, Yang T, Zhang W, Chen Z, Zeng S, Chen W, Zhang H, Wang Q, Wang W, Zhang X, Zhong T. Characteristics of hearing loss-associated gene mutations: A multi-center study of 119,606 neonates in Gannan. Int J Pediatr Otorhinolaryngol 2023; 174:111744. [PMID: 37801830 DOI: 10.1016/j.ijporl.2023.111744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/08/2023]
Abstract
BACKGROUND HL is the second most common congenital disability in China, and its high incidence brings a serious burden of medical and educational sequelae. HL genetic screening enables the identification of individuals with inherited HL and carriers in a large scale. OBJECTIVE This study aimed to measure the detection rates of hearing loss (HL)-associated gene mutations in the Gannan population. The molecular etiology and risk factors of hereditary HL were also analyzed. METHODS In total, 119,606 newborns from 18 districts of Gannan were enrolled in this multi-center study conducted between April 2019 and April 2021. Otoacoustic Emission (OAE) was used for primary hearing screening 3 days after birth in quiet conditions, and OAE combined with automated auditory brainstem response (AABR) was applied 29-42 days after birth for those who failed or missed the initial screening. Meanwhile, high-throughput sequencing of hotspot HL-associated mutations in GJB2, GJB3, MTRNR1, and SLC26A4 were performed. RESULTS Among the 119,606 newborns, 7796 (6.52%) failed the hearing screening. Genetic screening revealed that 5092 neonates (4.26%) carried HL-associated mutations. The detection rate of GJB2, SLC26A4, MTRNR1 and GJB3 mutations were 2.09%, 1.51%, 0.42% and 0.24%, respectively. The most prevalent variant was GJB2 c.235delC (1.74%). The second most prevalent variant was SLC26A4 c.919-2A > G (0.93%). The population who failed the hearing screening had a lower proportion (24.64%) of SLC26A4 gene variants compared to the population who passed (37.46%). Genetic screening identified 4612 (3.86%) carriers who were normal in hearing screenings. The concurrent hearing and genetic screening identified 480 (0.40%) neonates at high risk for hereditary HL. CONCLUSIONS The results of this study suggest that the concurrent hearing screening and high-throughput genetic screening would greatly improve the effectiveness of newborn HL programs. This integration also facilitates the management of congenital HL, and aids in the prevention of aminoglycoside antibiotics-induced HL.
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Affiliation(s)
- Minghong Zhao
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China; Laboratory Medicine, Guizhou Aerospace Hospital, Zunyi, China
| | - Xuemei Luo
- Ganzhou Municipal Health Commission, Ganzhou, China
| | - Qinfei Zhao
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Tong Yang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Wenqian Zhang
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Zhigang Chen
- BGI Genomics, Shenzhen, China; Clin Lab, BGI Genomics, Wuhan, China
| | - Shaoying Zeng
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Weifeng Chen
- Department of Otorhinolaryngology Head and Neck Surgery, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Huijuan Zhang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Qi Wang
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China
| | - Weihua Wang
- Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Xiaokang Zhang
- School of Public Health and Health Management, Gannan Medical University, Ganzhou, China.
| | - Tianyu Zhong
- The First School of Clinical Medicine, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China.
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Tetenborg S, Liss V, Breitsprecher L, Timonina K, Kotova A, Acevedo Harnecker AJ, Yuan C, Shihabeddin E, Ariakia F, Qin G, Chengzhi C, Dedek K, Zoidl G, Hensel M, O'Brien J. Intralumenal docking of connexin 36 channels in the ER isolates mistrafficked protein. J Biol Chem 2023; 299:105282. [PMID: 37742923 PMCID: PMC10637963 DOI: 10.1016/j.jbc.2023.105282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 08/30/2023] [Accepted: 09/05/2023] [Indexed: 09/26/2023] Open
Abstract
The intracellular domains of connexins are essential for the assembly of gap junctions. For connexin 36 (Cx36), the major neuronal connexin, it has been shown that a dysfunctional PDZ-binding motif interferes with electrical synapse formation. However, it is still unknown how this motif coordinates the transport of Cx36. In the present study, we characterize a phenotype of Cx36 mutants that lack a functional PDZ-binding motif using HEK293T cells as an expression system. We provide evidence that an intact PDZ-binding motif is critical for proper endoplasmic reticulum (ER) export of Cx36. Removing the PDZ-binding motif of Cx36 results in ER retention and the formation of multimembrane vesicles containing gap junction-like connexin aggregates. Using a combination of site-directed mutagenesis and electron micrographs, we reveal that these vesicles consist of Cx36 channels that docked prematurely in the ER. Our data suggest a model in which ER-retained Cx36 channels reshape the ER membrane into concentric whorls that are released into the cytoplasm.
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Affiliation(s)
| | - Viktoria Liss
- Department of Biology/Chemistry, iBiOs-Integrated Bioimaging Facility, CellNanOs - Center of Cellular Nanoanalytics, Osnabrück, Germany; Department of Microbiology, University of Osnabrück, Osnabrück, Germany
| | - Leonhard Breitsprecher
- Department of Biology/Chemistry, iBiOs-Integrated Bioimaging Facility, CellNanOs - Center of Cellular Nanoanalytics, Osnabrück, Germany; Department of Microbiology, University of Osnabrück, Osnabrück, Germany
| | - Ksenia Timonina
- Department of Biology, York University, Toronto, Ontario, Canada
| | - Anna Kotova
- Department of Biology, York University, Toronto, Ontario, Canada
| | | | - Chunxu Yuan
- Animal Navigation/Neurosensorics, Institute for Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germany
| | - Eyad Shihabeddin
- College of Optometry, University of Houston, Houston, Texas, USA; MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas, USA
| | - Fatemeh Ariakia
- College of Optometry, University of Houston, Houston, Texas, USA
| | - Guoting Qin
- College of Optometry, University of Houston, Houston, Texas, USA
| | - Cai Chengzhi
- Department of Chemistry, University of Houston, Houston, Texas, USA
| | - Karin Dedek
- Animal Navigation/Neurosensorics, Institute for Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germany; Research Center Neurosensory Science, University of Oldenburg, Oldenburg, Germany
| | - Georg Zoidl
- Department of Microbiology, University of Osnabrück, Osnabrück, Germany
| | - Michael Hensel
- Department of Biology/Chemistry, iBiOs-Integrated Bioimaging Facility, CellNanOs - Center of Cellular Nanoanalytics, Osnabrück, Germany; Department of Microbiology, University of Osnabrück, Osnabrück, Germany
| | - John O'Brien
- College of Optometry, University of Houston, Houston, Texas, USA.
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Rastad H, Samimisedeh P, Savad S, Seifi Alan M. A Novel Exon 2 Deletion Mutation in the GRXCR1 Gene Associated With Non-Syndromic Hearing Loss: A Case Report and Review of Literatures. Ann Otol Rhinol Laryngol 2023; 132:1493-1495. [PMID: 37009772 DOI: 10.1177/00034894231161866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Abstract
BACKGROUND About 80% of congenital hearing loss cases have genetic causes, often autosomal recessive and non-syndromic. Autosomal Recessive Non-syndromic hearing loss is characterized by extreme genetic heterogeneity. OBJECTIVES To report a case of congenital hearing loss with novel homozygous deletion in GRXCR1 gene. METHODS Case reports and review of literatures. RESULTS In this study, the proband was a 32-year-old woman seeking pre-marriage genetic counseling with non-syndromic congenital hearing loss. An owing negative test for GJB2 mutations, she underwent exome sequencing, unveiling a novel homozygous exon 2 deletion of the GRXCR1 gene. This mutation was confirmed in her affected mother and sibling by PCR and Quantitative Real-Time PCR. CONCLUSION We identified a novel GRXCR1 gene mutation related to congenital hearing loss in a family. Our study highlights the efficiency of exome sequencing in discovering gene mutations in cases of diseases with genetic heterogeneity.
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Affiliation(s)
- Hadith Rastad
- Non-communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Parham Samimisedeh
- Cardiovascular Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | | | - Mahnaz Seifi Alan
- Cardiovascular Research Center, Alborz University of Medical Sciences, Karaj, Iran
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Yen TT, Chen IC, Cho S, Chang TG, Shih KH, Hua MW, Li JL, Hsu CY, Hsiao TH, Chen YM. GJB2 p.V37I Mutation Associated With Moderate Nonsyndromic Hearing Loss in an Adult Taiwanese Population. Ear Hear 2023; 44:1423-1429. [PMID: 37271870 DOI: 10.1097/aud.0000000000001384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
BACKGROUND Gap junction protein beta 2 ( GJB2 ) p.V37I mutations are the most important hereditary cause of sensorineural hearing loss (SNHL) in Taiwan. Hearing outcomes are associated with hearing levels at baseline and the duration of follow-up. However, the audiological features of GJB2 p.V37I mutations in the adult population are unknown. The objectives of the present study were to investigate the audiological features, progression rate, and allele frequency of GJB2 p.V37I mutations among an adult Taiwanese population. METHODS Subjects of this case-control study were chosen from 13,580 participants of the Taiwan Precision Medicine Initiative. The genetic variations of GJB2 p.V37I were determined by polymerase chain reaction. We analyzed existing pure-tone threshold data from 38 individuals who were homozygous or compound heterozygotes for GJB2 p.V37I, 129 who were heterozygotes, and 602 individuals who were wild-type. Phenome-wide association studies (PheWAS) analysis was also performed to identify phenotypes associated with GJB2 p.V37I. RESULTS The minor allele frequency of GJB2 p.V37I was 0.92% in our study population. The mean hearing level of participants with a p.V37I mutation indicated moderate to severe hearing loss with 38.2% ± 22.3% binaural hearing impairment. GJB2 p.V37I was associated with an increased risk of hearing disability (odds ratio: 21.46, 95% confidence interval: 8.62 to 53.44, p < 0.001) in an autosomal recessive pattern. In addition, PheWAS discovered a significant association between GJB2 p.V37I and fracture of the humerus. GJB2 p.V37I is a pathogenic and prevalent variant of SNHL among the adult population. CONCLUSIONS The present study recommends patients with known GJB2 p.V37I mutations receive regular audiometric evaluation and genetic counseling. Early assistive listening device intervention is suggested to improve the quality of hearing.
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Affiliation(s)
- Ting-Ting Yen
- Department of Otolaryngology, Taichung Veterans General Hospital, Taichung, Taiwan
- School of Medicine, College of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan
| | - I-Chieh Chen
- Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Sudi Cho
- Department of Neurobiology, Physiology and Behavior, College of Biological Sciences, University of California, Davis, California, USA
| | - Ting-Gang Chang
- Department of Psychiatry, Taichung Veterans General Hospital, Taichung, Taiwan
- Department of Psychology, School of Psychology,Chung Shan Medical University, Taichung, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Kai-Hsiang Shih
- Department of Otolaryngology, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Men-Wei Hua
- Department of Otolaryngology, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Jui-Lin Li
- Department of Otolaryngology, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Chiann-Yi Hsu
- Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Tzu-Hung Hsiao
- Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
- Department of Public Health, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
- Institute of Genomics and Bioinformatics, College of Life Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Yi-Ming Chen
- School of Medicine, College of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan
- Department of Medical Research, Taichung Veterans General Hospital, Taichung, Taiwan
- Division of Allergy, Immunology, and Rheumatology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan
- Ph.D. Program in Translational Medicine and Rong Hsing Research Center for Translational Medicine, College of Life Sciences, National Chung Hsing University, Taiwan
- Precision Medicine Research Center, College of Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan
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Xu K, Chen S, Bai X, Xie L, Qiu Y, Liu X, Wang X, Kong W, Sun Y. Degradation of cochlear Connexin26 accelerate the development of age-related hearing loss. Aging Cell 2023; 22:e13973. [PMID: 37681746 PMCID: PMC10652327 DOI: 10.1111/acel.13973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/03/2023] [Accepted: 08/15/2023] [Indexed: 09/09/2023] Open
Abstract
The GJB2 gene, encoding Connexin26 (Cx26), is one of the most common causes of inherited deafness. Clinically, mutations in GJB2 cause congenital deafness or late-onset progressive hearing loss. Recently, it has been reported that Cx26 haploid deficiency accelerates the development of age-related hearing loss (ARHL). However, the roles of cochlear Cx26 in the hearing function of aged animals remain unclear. In this study, we revealed that the Cx26 expression was significantly reduced in the cochleae of aged mice, and further explored the underlying molecular mechanism for Cx26 degradation. Immunofluorescence co-localization results showed that Cx26 was internalized and degraded by lysosomes, which might be one of the important ways for Cx26 degradation in the cochlea of aged mice. Currently, whether the degradation of Cx26 in the cochlea leads directly to ARHL, as well as the mechanism of Cx26 degradation-related hearing loss are still unclear. To address these questions, we generated mice with Cx26 knockout in the adult cochlea as a model for the natural degradation of Cx26. Auditory brainstem response (ABR) results showed that Cx26 knockout mice exhibited high-frequency hearing loss, which gradually progressed over time. Pathological examination also revealed the degeneration of hair cells and spiral ganglions, which is similar to the phenotype of ARHL. In summary, our findings suggest that degradation of Cx26 in the cochlea accelerates the occurrence of ARHL, which may be a novel mechanism of ARHL.
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Affiliation(s)
- Kai Xu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Sen Chen
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Xue Bai
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Le Xie
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Yue Qiu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Xiao‐zhou Liu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Xiao‐hui Wang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Wei‐jia Kong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
- Hubei Province Key Laboratory of Oral and Maxillofacial Development and RegenerationWuhanChina
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Huang YA, Chen JC, Chiang PC, Chen LC, Kuo ML. Adeno-Associated Viral Vector-Delivered Pannexin-1 Mimetic Peptide Alleviates Airway Inflammation in an Allergen-Sensitized Mouse Model. Hum Gene Ther 2023; 34:1107-1117. [PMID: 37624738 DOI: 10.1089/hum.2023.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2023] Open
Abstract
Asthma is a chronic inflammatory disease around the world. Extracellular adenosine triphosphate works as a dangerous signal in responding to cellular stress, irritation, or inflammation. It has also been reported its association with the pathogenicity in asthma, with increased level in lungs of asthmatics. Pannexin-1 is one of the routes that contributes to the release of adenosine triphosphate form intracellular to extracellular. The aim of this study was to apply pannexin-1 peptide antagonist 10Panx1 into adeno-associated viral (AAV) vectors on ovalbumin (OVA)-induced asthmatic mouse model. The results demonstrated that this treatment was able to reduce the adenosine triphosphate level in bronchoalveolar lavage fluid and downregulate the major relevant to the symptom of asthma attack, airway hyperresponsiveness to methacholine. The histological data also gave a positive support with decreased tissue remodeling and mucus deposition. Other asthmatic related features, including eosinophilic inflammation and OVA-specific T helper type 2 responses, were also decreased by the treatment. Beyond the index of inflammation, the proportion of effector and regulatory T cells was examined to survey the potential mechanism behind. The data provided a slightly downregulated pattern in lung GATA3+ CD4 T cells. However, an upregulated population of CD25+FoxP3+ CD4 T cells was seen in spleens. These data suggested that exogeneous expression of 10Panx1 peptide was potential to alleviated asthmatic airway inflammation, and this therapeutic effect might be from 10Panx1-mediated disruption of T cell activation or differentiation. Collectively, AAV vector-mediated 10Panx1 expression could be a naval therapy option to develop.
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Affiliation(s)
- Yung-An Huang
- Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan (R.O.C.)
| | - Jeng-Chang Chen
- Department of Surgery, Chang Gung Memorial Hospital-Linkou, College of Medicine, Chang Gung University, Taoyuan, Taiwan (R.O.C.)
| | - Pei-Chuan Chiang
- Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan (R.O.C.)
| | - Li-Chen Chen
- Division of Allergy, Asthma, and Rheumatology, Department of Pediatrics, Chang Gung Memorial Hospital-Linkou, Taoyuan, Taiwan (R.O.C.)
- Department of Pediatrics, New Taipei Municipal Tucheng Hospital, New Taipei City, Taiwan (R.O.C.)
| | - Ming-Ling Kuo
- Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan (R.O.C.)
- Division of Allergy, Asthma, and Rheumatology, Department of Pediatrics, Chang Gung Memorial Hospital-Linkou, Taoyuan, Taiwan (R.O.C.)
- Department of Pediatrics, New Taipei Municipal Tucheng Hospital, New Taipei City, Taiwan (R.O.C.)
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Rusiecka OM, Molica F, Nielsen MS, Tollance A, Morel S, Frieden M, Chanson M, Boengler K, Kwak BR. Mitochondrial pannexin1 controls cardiac sensitivity to ischaemia/reperfusion injury. Cardiovasc Res 2023; 119:2342-2354. [PMID: 37556386 PMCID: PMC10597630 DOI: 10.1093/cvr/cvad120] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 04/27/2023] [Accepted: 05/18/2023] [Indexed: 08/11/2023] Open
Abstract
AIMS No effective therapy is available in clinics to protect the heart from ischaemia/reperfusion (I/R) injury. Endothelial cells are activated after I/R, which may drive the inflammatory response by releasing ATP through pannexin1 (Panx1) channels. Here, we investigated the role of Panx1 in cardiac I/R. METHODS AND RESULTS Panx1 was found in cardiac endothelial cells, neutrophils, and cardiomyocytes. After in vivo I/R, serum Troponin-I, and infarct size were less pronounced in Panx1-/- mice, but leukocyte infiltration in the infarct area was similar between Panx1-/- and wild-type mice. Serum Troponin-I and infarct size were not different between mice with neutrophil-specific deletion of Panx1 and Panx1fl/fl mice, suggesting that cardioprotection by Panx1 deletion rather involved cardiomyocytes than the inflammatory response. Physiological cardiac function in wild-type and Panx1-/- hearts was similar. The time to onset of contracture and time to maximal contracture were delayed in Panx1-/- hearts, suggesting reduced sensitivity of these hearts to ischaemic injury. Moreover, Panx1-/- hearts showed better recovery of left ventricle developed pressure, cardiac contractility, and relaxation after I/R. Ischaemic preconditioning failed to confer further protection in Panx1-/- hearts. Panx1 was found in subsarcolemmal mitochondria (SSM). SSM in WT or Panx1-/- hearts showed no differences in morphology. The function of the mitochondrial permeability transition pore and production of reactive oxygen species in SSM was not affected, but mitochondrial respiration was reduced in Panx1-/- SSM. Finally, Panx1-/- cardiomyocytes had a decreased mitochondrial membrane potential and an increased mitochondrial ATP content. CONCLUSION Panx1-/- mice display decreased sensitivity to cardiac I/R injury, resulting in smaller infarcts and improved recovery of left ventricular function. This cardioprotective effect of Panx1 deletion seems to involve cardiac mitochondria rather than a reduced inflammatory response. Thus, Panx1 may represent a new target for controlling cardiac reperfusion damage.
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Affiliation(s)
- Olga M Rusiecka
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Rue Michel-Servet 1, CH-1211 Geneva, Switzerland
| | - Filippo Molica
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Rue Michel-Servet 1, CH-1211 Geneva, Switzerland
| | - Morten S Nielsen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Axel Tollance
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Sandrine Morel
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Rue Michel-Servet 1, CH-1211 Geneva, Switzerland
| | - Maud Frieden
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Marc Chanson
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Kerstin Boengler
- Institute of Physiology, Justus-Liebig University, Giessen, Germany
| | - Brenda R Kwak
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Rue Michel-Servet 1, CH-1211 Geneva, Switzerland
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