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Kui L, Dong C, Wu J, Zhuo F, Yan B, Wang Z, Yang M, Xiong C, Qiu P. Causal association between type 2 diabetes mellitus and acute suppurative otitis media: insights from a univariate and multivariate Mendelian randomization study. Front Endocrinol (Lausanne) 2024; 15:1407503. [PMID: 38836234 PMCID: PMC11148255 DOI: 10.3389/fendo.2024.1407503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 05/09/2024] [Indexed: 06/06/2024] Open
Abstract
Background Type 2 diabetes mellitus (T2DM) and hearing loss (HL) constitute significant public health challenges worldwide. Recently, the association between T2DM and HL has aroused attention. However, possible residual confounding factors and other biases inherent to observational study designs make this association undetermined. In this study, we performed univariate and multivariable Mendelian Randomization (MR) analysis to elucidate the causal association between T2DM and common hearing disorders that lead to HL. Methods Our study employed univariate and multivariable MR analyses, with the Inverse Variance Weighted method as the primary approach to assessing the potential causal association between T2DM and hearing disorders. We selected 164 and 9 genetic variants representing T2DM from the NHGRI-EBI and DIAGRAM consortium, respectively. Summary-level data for 10 hearing disorders were obtained from over 500,000 participants in the FinnGen consortium and MRC-IEU. Sensitivity analysis revealed no significant heterogeneity of instrumental variables or pleiotropy was detected. Results In univariate MR analysis, genetically predicted T2DM from both sources was associated with an increased risk of acute suppurative otitis media (ASOM) (In NHGRI-EBI: OR = 1.07, 95% CI: 1.02-1.13, P = 0.012; In DIAGRAM: OR = 1.14, 95% CI: 1.02-1.26, P = 0.016). Multivariable MR analysis, adjusting for genetically predicted sleep duration, alcohol consumption, body mass index, and smoking, either individually or collectively, maintained these associations. Sensitivity analyses confirmed the robustness of the results. Conclusion T2DM was associated with an increased risk of ASOM. Strict glycemic control is essential for the minimization of the effects of T2DM on ASOM.
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Affiliation(s)
- Lihong Kui
- Xiamen Rehabilitation Hospital, Xiamen, Fujian, China
| | - Cheng Dong
- Depart of Rehabilitation Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junyu Wu
- School of Physical Education, Shanghai University of Sport, Shanghai, China
| | - Feinan Zhuo
- Department of Rehabilitation, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Bin Yan
- School of Rehabilitation Medicine, Jiangsu Vocational College of Medicine, Jiangsu, China
| | - Zhewei Wang
- Department of Rehabilitation, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Meiling Yang
- Xiamen Rehabilitation Hospital, Xiamen, Fujian, China
| | - Canhai Xiong
- Xiamen Rehabilitation Hospital, Xiamen, Fujian, China
| | - Peng Qiu
- Department of Rehabilitation, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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Kurabi A, Dewan K, Kerschner JE, Leichtle A, Li JD, Santa Maria PL, Preciado D. PANEL 3: Otitis media animal models, cell culture, tissue regeneration & pathophysiology. Int J Pediatr Otorhinolaryngol 2024; 176:111814. [PMID: 38101097 DOI: 10.1016/j.ijporl.2023.111814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/13/2023] [Accepted: 11/29/2023] [Indexed: 12/17/2023]
Abstract
OBJECTIVE To review and summarize recently published key articles on the topics of animal models, cell culture studies, tissue biomedical engineering and regeneration, and new models in relation to otitis media (OM). DATA SOURCE Electronic databases: PubMed, National Library of Medicine, Ovid Medline. REVIEW METHODS Key topics were assigned to the panel participants for identification and detailed evaluation. The PubMed reviews were focused on the period from June 2019 to June 2023, in any of the objective subject(s) or keywords listed above, noting the relevant references relating to these advances with a global overview and noting areas of recommendation(s). The final manuscript was prepared with input from all panel members. CONCLUSIONS In conclusion, ex vivo and in vivo OM research models have seen great advancements in the past 4 years. From the usage of novel genetic and molecular tools to the refinement of in vivo inducible and spontaneous mouse models, to the introduction of a wide array of reliable middle ear epithelium (MEE) cell culture systems, the next five years are likely to experience exponential growth in OM pathophysiology discoveries. Moreover, advances in these systems will predictably facilitate rapid means for novel molecular therapeutic studies.
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Affiliation(s)
- Arwa Kurabi
- Department of Otolaryngology, University of California San Diego, School of Medicine, La Jolla, CA, USA.
| | - Kalyan Dewan
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Joseph E Kerschner
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Anke Leichtle
- Department of Otorhinolaryngology, University of Luebeck, Luebeck, Germany
| | - Jian-Dong Li
- Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, GA, USA
| | - Peter Luke Santa Maria
- Department of Otolaryngology - Head & Neck Surgery, Stanford University, Stanford, CA, USA
| | - Diego Preciado
- Children's National Hospital, Division of Pediatric Otolaryngology, Washington, DC, USA
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3
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Nokso-Koivisto J, Ehrlich GD, Enoksson F, Komatsu K, Mason K, Melhus Å, Patel JA, Vijayasekaran S, Ryan A. Otitis media: Interactions between host and environment, immune and inflammatory responses. Int J Pediatr Otorhinolaryngol 2024; 176:111798. [PMID: 38041988 DOI: 10.1016/j.ijporl.2023.111798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 11/12/2023] [Accepted: 11/19/2023] [Indexed: 12/04/2023]
Abstract
OBJECTIVE To review and highlight progress in otitis media (OM) research in the areas of immunology, inflammation, environmental influences and host-pathogen responses from 2019 to 2023. Opportunities for innovative future research were also identified. DATA SOURCES PubMed database of the National Library of Medicine. REVIEW METHODS Key topics were assigned to each panel member for detailed review. Search of the literature was from June 2019 until February 2023. Draft reviews were collated, circulated, and discussed among panel members at the 22nd International Symposium on Recent Advances in Otitis Media in June 2023. The final manuscript was prepared and approved by all the panel members. CONCLUSIONS Important advances were identified in: environmental influences that enhance OM susceptibility; polymicrobial middle ear (ME) infections; the role of adaptive immunity defects in otitis-proneness; additional genes linked to OM; leukocyte contributions to OM pathogenesis and recovery; and novel interventions in OM based on host responses to infection. Innovative areas of research included: identification of novel bacterial genes and pathways important for OM persistence, bacterial adaptations and evolution that enhance chronicity; animal and human ME gene expression, including at the single-cell level; and Sars-CoV-2 infection of the ME and Eustachian tube.
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Affiliation(s)
- Johanna Nokso-Koivisto
- Department of Otorhinolaryngology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland.
| | - Garth D Ehrlich
- Department of Microbiology and Immunology and Department of Otolaryngology - Head and Neck Surgery, Drexel University College of Medicine, Philadelphia, PA, USA
| | | | - Kensei Komatsu
- Center for Inflammation, Immunity & Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, GA, USA
| | - Kevin Mason
- The Research Institute at Nationwide Children's Hospital, Infectious Diseases Institute, The Ohio State University School of Medicine, Columbus, OH, USA
| | - Åsa Melhus
- Department of Medical Sciences, Section of Clinical Bacteriology, Uppsala University, Uppsala, Sweden
| | - Janak A Patel
- Department of Infection Control & Healthcare Epidemiology and Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Texas Medical Branch, Galveston, TX, USA
| | - Shiyan Vijayasekaran
- Perth ENT Centre, Perth Children's Hospital, University of Western Australia, Perth, Australia
| | - Allen Ryan
- Department of Surgery, Division of Otolaryngology, University of California San Diego, San Diego, CA, USA
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Chen X, Dumbuya JS, Du J, Xue L, Zeng Q. Bovine pulmonary surfactant alleviates inflammation and epithelial cell apoptosis in the early phase of lipopolysaccharide-induced acute lung injury in rats. Biotechnol Genet Eng Rev 2023:1-19. [PMID: 37154048 DOI: 10.1080/02648725.2023.2210452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We investigate the impact of bovine pulmonary surfactant (PS) on LPS-induced ALI in vitro and in vivo to improve recognition and prevent mortality in sepsis-induced ALI. Primary alveolar type II (AT2) cells were treated with LPS alone or in combination with PS. Cell morphology observation, CCK-8 proliferation assay, flow cytometry apoptosis assay, and ELISA for inflammatory cytokine levels were performed at different time points after treatment. An LPS-induced ALI rat model was established and treated with vehicle or PS. Lung wet/dry weight ratio, histopathological changes, lung function parameters, and serum inflammatory cytokine levels were examined 6 h after PS treatment. Survival analysis by Kaplan-Meier method. RNA sequencing was conducted to identify LPS-induced differentially expressed genes in rat lungs. Proapoptotic gene expression in rat lungs was determined by Western blot. LPS significantly inhibited cell proliferation while promoting apoptosis of AT2 cells starting 2 h after treatment, accompanied by a significant increase in inflammatory cytokine production; PS reversed these effects. PS decreased the lung wet/dry ratio in septic rats, histological abnormalities, alterations in lung function parameters, and inflammatory cytokines production; while improving the overall survival of rats. LPS-induced differentially expressed genes were closely associated with apoptosis. PS attenuated LPS-induced upregulation of proapoptotic gene expression starting 2 h after treatment in AT2 cells while restoring lung ATPase activity in vivo. Bovine PS alleviates LPS-induced ALI in the early phase, possibly by suppressing inflammation and AT2 cell apoptosis, as a preemptive therapeutic agent for managing sepsis-induced ALI.
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Affiliation(s)
- Xinxin Chen
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - John Sieh Dumbuya
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Jiang Du
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Lijun Xue
- Department of neonatology, Songgang People's Hospital, Shenzhen, China
| | - Qiyi Zeng
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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5
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Chen T, Li G, Liu W, Fan Z, Li L. Surfactant Protein A Can Affect Macrophage Phagocytosis: An Important Pathogenic Mechanism of Otitis Media with Effusion. J Assoc Res Otolaryngol 2023; 24:171-180. [PMID: 36820988 PMCID: PMC10121950 DOI: 10.1007/s10162-023-00893-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 02/10/2023] [Indexed: 02/24/2023] Open
Abstract
Otitis media with effusion (OME), also known as secretory otitis media, is a common condition in otorhinolaryngology. The main manifestations include middle ear effusion and conductive hearing loss. Recently, increasing attention has been paid to the etiology of OME, wherein immune dysfunction is one important pathogenic mechanism. However, it is unknown whether changes in surfactant protein A (SPA) secretion affect the phagocytic activity of macrophages in the Eustachian tube, thereby altering pathogen clearance, during the pathogenesis of OME. In our study, an OME animal model was established and evaluated. Differences in SPA levels in Eustachian tube lavage fluid between the experimental and control groups were analyzed. Cell-based experiments revealed that SPA decreased the expression of CD64 and SYK and inhibited phagocytosis by RAW264.7 cells. By using flow cytometry and immunofluorescence, we confirmed that macrophage phagocytosis decreased with increasing SPA levels. Finally, we concluded that SPA affects macrophage function and plays a role in the occurrence and development of OME.
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Affiliation(s)
- Tao Chen
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, No. 4, Duanxing West Road, Huaiyin District, Jinan, 250023, China
- Department of Otolaryngology, Shenzhen Second People's Hospital/The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Guodong Li
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, No. 4, Duanxing West Road, Huaiyin District, Jinan, 250023, China
- Department of Otolaryngology, Shanxi Provincial People's Hospital/The Fifth Clinical Medical College of Shanxi Medical University, Taiyuan, China
| | - Wenwen Liu
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, No. 4, Duanxing West Road, Huaiyin District, Jinan, 250023, China
| | - Zhaomin Fan
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, No. 4, Duanxing West Road, Huaiyin District, Jinan, 250023, China
| | - Li Li
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, No. 4, Duanxing West Road, Huaiyin District, Jinan, 250023, China.
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Abdel-Razek O, Audlin J, Poe DS, Wang G. Surfactant proteins and innate immunity of otitis media. Innate Immun 2022; 28:213-223. [PMID: 36069032 PMCID: PMC9900255 DOI: 10.1177/17534259221123309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Otitis media (OM) is the most common disease among young children and one of the most frequent reasons to visit the pediatrician. Development of OM requires nasopharyngeal colonization by a pathogen which must gain access to the tympanic cavity through the eustachian tube (ET) along with being able to overcome the defense mechanisms of the immune system and middle ear mucosa. OM can be caused by viral or bacterial infection. The three main bacterial pathogens are Streptococcus pneumoniae, nontypeable Haemophilus influenzae (NTHi), and Moraxella catarrhalis. Innate immunity is important in OM resolution as the disease occurs in very young children before the development of specific immunity. Elements of innate immunity include natural barriers and pattern recognition receptors such as Toll like receptors (TLRs), and Nod like receptors (NLRs). Surfactant proteins A (SP-A) and D (SP-D) act as pattern recognition receptors and are found in the lung and many other tissues including the ET and the middle ear where they probably function in host defense. Surfactant has a potential for use in the treatment of OM due to surface tension lowering function in the ET, and the possible immune functions of SP-D and SP-A in the middle ear and ET.
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Affiliation(s)
- Osama Abdel-Razek
- Department of Surgery, SUNY Upstate Medical University, Syracuse, NY, USA,Guirong Wang, Department of Surgery, UH Room 8715, SUNY Upstate Medical University, 750 E Adams St, Syracuse, NY, 13210, USA.
| | - Jason Audlin
- Department of Otolaryngology, SUNY Upstate Medical University, Syracuse, NY, USA
| | | | - Guirong Wang
- Department of Surgery, SUNY Upstate Medical University, Syracuse, NY, USA,Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA
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7
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Li G, Chen T, Mao Y, Ai Y, Yan W, Lu Y, Liu W, Wang H, Li L. Surfactant Protein A can Affect the Surface Tension of the Eustachian Tube and Macrophage Migration. Laryngoscope 2022. [DOI: 10.1002/lary.30396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 08/18/2022] [Accepted: 08/26/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Guodong Li
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
- Department of Otolaryngology Shanxi Provincial People's Hospital/The Fifth Clinical Medical College of Shanxi Medical University Jinzhong Shanxi China
| | - Tao Chen
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
- Department of Otorhinolaryngology Shenzhen Second People's Hospital/The First Affiliated Hospital of Shenzhen University Jinzhong Shanxi China
| | - Yanyan Mao
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Yu Ai
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Wenqing Yan
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Yanqing Lu
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Wenwen Liu
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Haibo Wang
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
| | - Li Li
- Department of Otolaryngology‐Head and Neck surgery Shandong Provincial ENT Hospital, Shandong University Jinan Shandong China
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8
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Massa HM, Spann KM, Cripps AW. Innate Immunity in the Middle Ear Mucosa. Front Cell Infect Microbiol 2021; 11:764772. [PMID: 34778109 PMCID: PMC8586084 DOI: 10.3389/fcimb.2021.764772] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/11/2021] [Indexed: 01/14/2023] Open
Abstract
Otitis media (OM) encompasses a spectrum of clinical presentations ranging from the readily identifiable Acute OM (AOM), which is characterised by otalgia and fever, to chronic otitis media with effusion (COME) where impaired hearing due to middle ear effusion may be the only clinical symptom. Chronic suppurative OM (CSOM) presents as a more severe form of OM, involving perforation of the tympanic membrane. The pathogenesis of OM in these varied clinical presentations is unclear but activation of the innate inflammatory responses to viral and/or bacterial infection of the upper respiratory tract performs an integral role. This localised inflammatory response can persist even after pathogens are cleared from the middle ear, eustachian tubes and, in the case of respiratory viruses, even the nasal compartment. Children prone to OM may experience an over exuberant inflammatory response that underlies the development of chronic forms of OM and their sequelae, including hearing impairment. Treatments for chronic effusive forms of OM are limited, with current therapeutic guidelines recommending a "watch and wait" strategy rather than active treatment with antibiotics, corticosteroids or other anti-inflammatory drugs. Overall, there is a clear need for more targeted and effective treatments that either prevent or reduce the hyper-inflammatory response associated with chronic forms of OM. Improved treatment options rely upon an in-depth understanding of OM pathogenesis, particularly the role of the host innate immune response during acute OM. In this paper, we review the current literature regarding the innate immune response within the middle ear to bacterial and viral otopathogens alone, and as co-infections. This is an important consideration, as the role of respiratory viruses as primary pathogens in OM is not yet fully understood. Furthermore, increased reporting from PCR-based diagnostics, indicates that viral/bacterial co-infections in the middle ear are more common than bacterial infections alone. Increasingly, the mechanisms by which viral/bacterial co-infections may drive or maintain complex innate immune responses and inflammation during OM as a chronic response require investigation. Improved understanding of the pathogenesis of chronic OM, including host innate immune response within the middle ear is vital for development of improved diagnostic and treatment options for our children.
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Affiliation(s)
- Helen M Massa
- School of Pharmacy and Medical Science, Griffith University, Gold Coast, QLD, Australia
| | - Kirsten M Spann
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia
| | - Allan W Cripps
- Menzies Health Institute Queensland, School of Medicine, Griffith University, Gold Coast, QLD, Australia.,School of Medicine and Dentistry, Griffith University, Gold Coast, QLD, Australia
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9
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Abdel-Razek O, Liu T, Chen X, Wang Q, Vanga G, Wang G. Role of Surfactant Protein D in Experimental Otitis Media. J Innate Immun 2021; 13:197-210. [PMID: 33556949 DOI: 10.1159/000513605] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 12/01/2020] [Indexed: 11/19/2022] Open
Abstract
Surfactant protein D (SP-D) is a C-type collectin and plays an important role in innate immunity and homeostasis in the lung. This study studied SP-D role in the nontypeable Haemophilus influenzae (NTHi)-induced otitis media (OM) mouse model. Wild-type C57BL/6 (WT) and SP-D knockout (KO) mice were used in this study. Mice were injected in the middle ear (ME) with 5 μL of NTHi bacterial solution (3.5 × 105 CFU/ear) or with the same volume of sterile saline (control). Mice were sacrificed at 3 time points, days 1, 3, and 7, after treatment. We found SP-D expression in the Eustachian tube (ET) and ME mucosa of WT mice but not in SP-D KO mice. After infection, SP-D KO mice showed more intense inflammatory changes evidenced by the increased mucosal thickness and inflammatory cell infiltration in the ME and ET compared to WT mice (p < 0.05). Increased bacterial colony-forming units and cytokine (IL-6 and IL-1β) levels in the ear washing fluid of infected SP-D KO mice were compared to infected WT mice. Molecular analysis revealed higher levels of NF-κB and NLRP3 activation in infected SP-D KO compared to WT mice (p < 0.05). In vitro studies demonstrated that SP-D significantly induced NTHi bacterial aggregation and enhanced bacterial phagocytosis by macrophages (p < 0.05). Furthermore, human ME epithelial cells showed a dose-dependent increased expression of NLRP3 and SP-D proteins after LPS treatment. We conclude that SP-D plays a critical role in innate immunity and disease resolution through enhancing host defense and regulating inflammatory NF-κB and NLRP3 activation in experimental OM mice.
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Affiliation(s)
- Osama Abdel-Razek
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Tianyi Liu
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Xinghua Chen
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Qiushi Wang
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Gautam Vanga
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA
| | - Guirong Wang
- Department of Surgery, SUNY Upstate Medical University, Syracuse, New York, USA, .,Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, New York, USA,
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Depicolzuane L, Phelps DS, Floros J. Surfactant Protein-A Function: Knowledge Gained From SP-A Knockout Mice. Front Pediatr 2021; 9:799693. [PMID: 35071140 PMCID: PMC8777267 DOI: 10.3389/fped.2021.799693] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 12/03/2021] [Indexed: 02/04/2023] Open
Abstract
Pulmonary surfactant proteins have many roles in surfactant- related functions and innate immunity. One of these proteins is the surfactant protein A (SP-A) that plays a role in both surfactant-related processes and host defense and is the focus in this review. SP-A interacts with the sentinel host defense cell in the alveolus, the alveolar macrophage (AM), to modulate its function and expression profile under various conditions, as well as other alveolar epithelial cells such as the Type II cell. Via these interactions, SP-A has an impact on the alveolar microenvironment. SP-A is also important for surfactant structure and function. Much of what is understood of the function of SP-A and its various roles in lung health has been learned from SP-A knockout (KO) mouse experiments, as reviewed here. A vast majority of this work has been done with infection models that are bacterial, viral, and fungal in nature. Other models have also been used, including those of bleomycin-induced lung injury and ozone-induced oxidative stress either alone or in combination with an infectious agent, bone marrow transplantation, and other. In addition, models investigating the effects of SP-A on surfactant components or surfactant structure have contributed important information. SP-A also appears to play a role in pathways involved in sex differences in response to infection and/or oxidative stress, as well as at baseline conditions. To date, this is the first review to provide a comprehensive report of the functions of SP-A as learned through KO mice.
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Affiliation(s)
| | | | - Joanna Floros
- Departments of Pediatrics, Hershey, PA, United States.,Obstetrics and Gynecology, The Pennsylvania State University College of Medicine, Hershey, PA, United States
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