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Kim H, Kim SJ. 3D Bioprinting of Pig Macrophages and Human Cells Discovered the P2Y14 Receptor as a Mediator of Xenogenic Immune Responses. Immunol Invest 2024:1-16. [PMID: 39356134 DOI: 10.1080/08820139.2024.2411388] [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: 10/03/2024]
Abstract
BACKGROUND The survival rate of pig lung xenotransplantation (PLXTx) recipients is severely limited by intense xenogenic immune responses, necessitating further insights into xenogeneic immunity and the development of models to study the PLXTx immune response. METHODS We identified regulators of PLXTx immune response Using Gene ontology analysis. We assessed the metabolic changes and protein levels in 3D4/31 pig alveolar macrophages (PAMs) through flow cytometry and immunoblotting. To induce a xenogenic immune response, we co-cultured 3D4/31-PAMs with A549 human alveolar epithelial cells and evaluated cytokine expression using qRT-PCR. RESULTS Gene ontology analysis identified STAT1 and alveolar macrophages as contributors to lung autoimmunity and transplant rejection. In 3D4/31-PAMs, phorbol myristate acetate-induced glycogen accumulation and cyclooxygenase-2 expression were inhibited by the P2Y14 inhibitor PPTN. Co-culturing 3D4/31-PAMs with A549 human alveolar epithelial cells via 3D bioprinting resulted in a more pronounced inflammatory response than 2D co-culture, with increased expression of genes related to the P2Y14 cascade and inflammation. This inflammatory gene expression was prevented by PPTN treatment. CONCLUSION Based on these results, we propose alginate bioprinting as an in vitro model for PLXTx and suggest that P2Y14 is a key regulator of xenogeneic immune responses in PAMs.
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Affiliation(s)
- Hyungkuen Kim
- Department of Biotechnology, College of Life and Health Sciences, Hoseo University, Asan, Republic of Korea
| | - Sung-Jo Kim
- Department of Biotechnology, College of Life and Health Sciences, Hoseo University, Asan, Republic of Korea
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Niechoda A, Roslan M, Milewska K, Szoka P, Maciorowska K, Holownia A. Signalling Pathways of Inflammation and Cancer in Human Mononuclear Cells: Effect of Nanoparticle Air Pollutants. Cells 2024; 13:1367. [PMID: 39195257 DOI: 10.3390/cells13161367] [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: 06/21/2024] [Revised: 08/05/2024] [Accepted: 08/12/2024] [Indexed: 08/29/2024] Open
Abstract
Fine inhalable particulate matter (PM) triggers an inflammatory response in the airways and activates mononuclear cells, mediators of tissue homeostasis, and tumour-promoting inflammation. We have assessed ex vivo responses of human monocytes and monocyte-derived macrophages to standardised air pollutants: carbon black, urban dust, and nanoparticulate carbon black, focusing on their pro-inflammatory and DNA-damaging properties. None of the PM (100 μg/mL/24 h) was significantly toxic to the cells, aside from inducing oxidative stress, fractional DNA damage, and inhibiting phagocytosis. TNFα was only slightly increased. PM nanoparticles increase the expression and activate DNA-damage-related histone H2A.X as well as pro-inflammatory NF-κB. We have shown that the urban dust stimulates the pathway of DNA damage/repair via the selective post-translational phosphorylation of H2A.X while nanoparticulate carbon black increases inflammation via activation of NF-κB. Moreover, the inflammatory response to lipopolysaccharide was significantly stronger in macrophages pre-exposed to urban dust or nanoparticulate carbon black. Our data show that airborne nanoparticles induce PM-specific, epigenetic alterations in the subsets of cultured mononuclear cells, which may be quantified using binary fluorescence scatterplots. Such changes intercede with inflammatory signalling and highlight important molecular and cell-specific epigenetic mechanisms of tumour-promoting inflammation.
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Affiliation(s)
- Agata Niechoda
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
| | - Maciej Roslan
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
| | - Katarzyna Milewska
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
| | - Piotr Szoka
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
| | - Katarzyna Maciorowska
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
| | - Adam Holownia
- Department of Pharmacology, Medical University of Bialystok, Mickiewicza 2c, 15-222 Bialystok, Poland
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Zhao X, Ni W, Zheng W, Ni W, Sun C, Gu Y, Gu Z. Multi-regulatory potency of USP1 on inflammasome components promotes pyroptosis in thyroid follicular cells and contributes to the progression of Hashimoto's thyroiditis. Mol Med 2024; 30:121. [PMID: 39134949 PMCID: PMC11318162 DOI: 10.1186/s10020-024-00885-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 07/22/2024] [Indexed: 08/16/2024] Open
Abstract
BACKGROUND Inflammatory diseases are often initiated by the activation of inflammasomes triggered by pathogen-associated molecular patterns (PAMPs) and endogenous damage-associated molecular patterns (DAMPs), which mediate pyroptosis. Although pyroptosis resulting from aberrant inflammasome triggering in thyroid follicular cells (TFCs) has been observed in Hashimoto's thyroiditis (HT) patients, the underlying mechanisms remain largely unknown. Given the extensive involvement of protein ubiquitination and deubiquitination in inflammatory diseases, we aimed to investigate how deubiquitinating enzymes regulate thyroid follicular cell pyroptosis and HT pathogenesis. METHODS Our study specifically investigated the role of Ubiquitin-specific peptidase 1 (USP1), a deubiquitinase (DUB), in regulating the inflammasome components NLRP3 and AIM2, which are crucial in pyroptosis. We conducted a series of experiments to elucidate the function of USP1 in promoting pyroptosis associated with inflammasomes and the progression of HT. These experiments involved techniques such as USP1 knockdown or inhibition, measurement of key pyroptosis indicators including caspase-1, caspase-1 p20, and GSDMD-N, and examination of the effects of USP1 abrogation on HT using a mouse model. Furthermore, we explored the impact of USP1 on NLRP3 transcription and its potential interaction with p65 nuclear transportation. RESULTS Our findings provide compelling evidence indicating that USP1 plays a pivotal role in promoting inflammasome-mediated pyroptosis and HT progression by stabilizing NLRP3 and AIM2 through deubiquitination. Furthermore, we discovered that USP1 modulates the transcription of NLRP3 by facilitating p65 nuclear transportation. Knockdown or inhibition of USP1 resulted in weakened cell pyroptosis, as evidenced by reduced levels of caspase-1 p20 and GSDMD-N, which could be restored upon AIM2 overexpression. Remarkably, USP1 abrogation significantly ameliorated HT in the mice model, likely to that treating mice with pyroptosis inhibitors VX-765 and disulfiram. CONCLUSIONS Our study highlights a regulatory mechanism of USP1 on inflammasome activation and pyroptosis in TFCs during HT pathogenesis. These findings expand our understanding of HT and suggest that inhibiting USP1 may be a potential treatment strategy for managing HT.
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Affiliation(s)
- Xuying Zhao
- Dalian Medical University, Dalian, Liaoning, China
- Department of Endocrinology and Metabolism, Affiliated Hospital of Nantong University, No. 20 Xisi Road, Nantong, 226001, Jiangsu, China
| | - Wenyu Ni
- Department of Endocrinology and Metabolism, Qidong People's Hospital, Nantong, Jiangsu, China
| | - Wenjie Zheng
- Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Wenkai Ni
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Chunfeng Sun
- Department of Nuclear Medicine, Affiliated Hospital of Nantong University, No. 20 Xisi Road, Nantong, 226001, Jiangsu, China.
| | - Yunjuan Gu
- Department of Endocrinology and Metabolism, Affiliated Hospital of Nantong University, No. 20 Xisi Road, Nantong, 226001, Jiangsu, China.
| | - Zhifeng Gu
- Dalian Medical University, Dalian, Liaoning, China.
- Department of Rheumatology, Affiliated Hospital of Nantong University, No. 20 Xisi Road, Nantong, 226001, Jiangsu, China.
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Ciryam P, Gerzanich V, Simard JM. Interleukin-6 in Traumatic Brain Injury: A Janus-Faced Player in Damage and Repair. J Neurotrauma 2023; 40:2249-2269. [PMID: 37166354 PMCID: PMC10649197 DOI: 10.1089/neu.2023.0135] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023] Open
Abstract
Traumatic brain injury (TBI) is a common and often devastating illness, with wide-ranging public health implications. In addition to the primary injury, victims of TBI are at risk for secondary neurological injury by numerous mechanisms. Current treatments are limited and do not target the profound immune response associated with injury. This immune response reflects a convergence of peripheral and central nervous system-resident immune cells whose interaction is mediated in part by a disruption in the blood-brain barrier (BBB). The diverse family of cytokines helps to govern this communication and among these, Interleukin (IL)-6 is a notable player in the immune response to acute neurological injury. It is also a well-established pharmacological target in a variety of other disease contexts. In TBI, elevated IL-6 levels are associated with worse outcomes, but the role of IL-6 in response to injury is double-edged. IL-6 promotes neurogenesis and wound healing in animal models of TBI, but it may also contribute to disruptions in the BBB and the progression of cerebral edema. Here, we review IL-6 biology in the context of TBI, with an eye to clarifying its controversial role and understanding its potential as a target for modulating the immune response in this disease.
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Affiliation(s)
- Prajwal Ciryam
- Shock Trauma Neurocritical Care, Program in Trauma, R Adams Cowley Shock Trauma Center, University of Maryland Medical System, Baltimore, Maryland, USA
- Department of Neurology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Volodymyr Gerzanich
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - J. Marc Simard
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Pathology, University of Maryland School of Medicine, Baltimore, Maryland, USA
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5
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Atif SM, Mack DG, Martin AK, Fontenot AP. Protective role of tissue-resident regulatory T cells in a murine model of beryllium-induced disease. JCI Insight 2022; 7:156098. [PMID: 35819849 PMCID: PMC9462505 DOI: 10.1172/jci.insight.156098] [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] [Received: 10/25/2021] [Accepted: 07/07/2022] [Indexed: 11/17/2022] Open
Abstract
CD4+ T cells drive the immunopathogenesis of chronic beryllium disease (CBD), and their recruitment to the lung heralds the onset of granulomatous inflammation. We have shown that regulatory CD4+ T cells (Tregs) control granuloma formation in an HLA-DP2 transgenic (Tg) model of CBD. In these mice, Be oxide (BeO) exposure resulted in the accumulation of three distinct CD4+ T cell subsets in the lung with the majority of tissue-resident memory cells expressing FoxP3. The amount of Be regulated the number of total and antigen-specific CD4+ T cells and Tregs in the lungs of HLA-DP2 Tg mice. Depletion of Tregs increased the number of IFN-γ-producing CD4+ T cells and enhanced lung injury while mice treated with IL2/αIL-2 complexes had increased Tregs and reduced inflammation and Be-responsive T cells in the lung. BeO-experienced resident Tregs suppressed anti-CD3-induced proliferation of CD4+ T cells in a contact-dependent manner. CLTLA-4 and ICOS blockade as well as addition of LPS to BeO-exposed mice increased the Teff/Treg ratio and enhanced lung injury. Collectively, these data show that the protective role of tissue-resident Tregs is dependent on quantity of Be exposure and is overcome by blocking immune regulatory molecules or additional environmental insults.
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Affiliation(s)
- Shaikh M Atif
- Department of Medicine, University of Colorado Anschutz Medical Campus, Auroroa, United States of America
| | - Douglas G Mack
- Department of Medicine, University of Colorado Anschutz Medical Campus, Auroroa, United States of America
| | - Allison K Martin
- Department of Medicine, University of Colorado Anschutz Medical Campus, Auroroa, United States of America
| | - Andrew P Fontenot
- Department of Medicine, University of Colorado Anschutz Medical Campus, Auroroa, United States of America
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de Jesus MCS, Barbosa JHR, Menezes RADO, Gomes MDSM, Bomfim LGS, Pimenta TS, Baptista ARDS, Machado RLD, de Moura TR, Storti-Melo LM. Soluble triggering receptor expressed on myeloid cells-1 (sTREM-1) and other inflammatory mediators in malaria by Plasmodium vivax during enteroparasites coinfection. PLoS One 2022; 17:e0270007. [PMID: 35749690 PMCID: PMC9232225 DOI: 10.1371/journal.pone.0270007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 06/01/2022] [Indexed: 11/19/2022] Open
Abstract
Malaria is a major health issue with more than 200 million cases occurring annually. Moreover, in Malaria endemic area are frequently observed Malaria-enteroparasite co-infections associated with the modulation of inflammatory response. In this aspect, biomarkers play an important role in the disease prognosis. This study aimed to evaluate inflammatory mediators in malaria during coinfection with enteroparasites. A subset of serum samples already collected was analyzed and divided into four groups: Malaria (n = 34), Co-infected (n = 116), Enteroparasite (n = 120) and Control (n = 95). The serum levels of sTREM-1 and IL-6 were measured by ELISA. TNF-α, and IL-10 levels were previously carried out by flow cytometry. Higher serum levels of sTREM-1 and IL-6 were showed in malaria patients compared to healthy controls. In co-infected malarial patients sTREM-1 serum levels were similar to control group. Interestingly, co-infected malaria patients showed IL-6 serum levels decreased compared to individuals only infected with P. vivax. However, in Malaria patients and co-infected there was a positive correlation between the IL-6 and IL-10 levels (P < 0.0001). This is the first report of sTREM-1 levels in P. vivax infected. Moreover, the results revealing a divergent effect of co-infection with the increased balance between pro-and anti-inflammatory cytokines and reduced IL-6 levels but increases the anemia occurrence. The results also highlight the potential use of IL-6 as a biomarker for P. vivax and enteroparasites coinfection.
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Affiliation(s)
- Myrela Conceição Santos de Jesus
- Programa de Pós-Graduação em Microbiologia e Parasitologia Aplicadas, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brasil
| | - José Hugo Romão Barbosa
- Programa de Pós-Graduação em Biologia Parasitária, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
| | | | | | | | - Tamirys Simão Pimenta
- Instituto Evandro Chagas / Secretaria de Vigilância em Saúde / Ministério da Saúde, Ananindeua, Pará, Brasil
| | - Andrea Regina de Souza Baptista
- Programa de Pós-Graduação em Microbiologia e Parasitologia Aplicadas, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brasil
| | - Ricardo Luiz Dantas Machado
- Programa de Pós-Graduação em Microbiologia e Parasitologia Aplicadas, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brasil
- Programa de Pós-Graduação em Biologia Parasitária, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
| | - Tatiana Rodrigues de Moura
- Programa de Pós-Graduação em Biologia Parasitária, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
- Health Sciences Graduate Program, Federal University of Sergipe, São Cristóvão, Brazil
- Departamento de Morfologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
- * E-mail:
| | - Luciane Moreno Storti-Melo
- Programa de Pós-Graduação em Biologia Parasitária, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
- Departamento de Biologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Sergipe, São Cristóvão, Sergipe, Brasil
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McKee AS, Atif SM, Falta MT, Fontenot AP. Innate and Adaptive Immunity in Noninfectious Granulomatous Lung Disease. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 208:1835-1843. [PMID: 35418504 PMCID: PMC9106315 DOI: 10.4049/jimmunol.2101159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 02/08/2022] [Indexed: 11/19/2022]
Abstract
Sarcoidosis and chronic beryllium disease are noninfectious lung diseases that are characterized by the presence of noncaseating granulomatous inflammation. Chronic beryllium disease is caused by occupational exposure to beryllium containing particles, whereas the etiology of sarcoidosis is not known. Genetic susceptibility for both diseases is associated with particular MHC class II alleles, and CD4+ T cells are implicated in their pathogenesis. The innate immune system plays a critical role in the initiation of pathogenic CD4+ T cell responses as well as the transition to active lung disease and disease progression. In this review, we highlight recent insights into Ag recognition in chronic beryllium disease and sarcoidosis. In addition, we discuss the current understanding of the dynamic interactions between the innate and adaptive immune systems and their impact on disease pathogenesis.
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Affiliation(s)
- Amy S McKee
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO; and
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Shaikh M Atif
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO; and
| | - Michael T Falta
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO; and
| | - Andrew P Fontenot
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO; and
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO
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8
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Robinson EK, Worthington A, Poscablo D, Shapleigh B, Salih MM, Halasz H, Seninge L, Mosqueira B, Smaliy V, Forsberg EC, Carpenter S. lincRNA-Cox2 Functions to Regulate Inflammation in Alveolar Macrophages during Acute Lung Injury. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 208:1886-1900. [PMID: 35365562 PMCID: PMC9038212 DOI: 10.4049/jimmunol.2100743] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 02/05/2022] [Indexed: 12/15/2022]
Abstract
Our respiratory system is vital to protect us from the surrounding nonsterile environment; therefore, it is critical for a state of homeostasis to be maintained through a balance of inflammatory cues. Recent studies have shown that actively transcribed noncoding regions of the genome are emerging as key regulators of biological processes, including inflammation. lincRNA-Cox2 is one such example of an inflammatory inducible long intergenic noncoding RNA functioning to fine-tune immune gene expression. Using bulk and single-cell RNA sequencing, in addition to FACS, we find that lincRNA-Cox2 is most highly expressed in the lung and is most upregulated after LPS-induced lung injury (acute lung injury [ALI]) within alveolar macrophages, where it functions to regulate inflammation. We previously reported that lincRNA-Cox2 functions to regulate its neighboring protein Ptgs2 in cis, and in this study, we use genetic mouse models to confirm its role in regulating gene expression more broadly in trans during ALI. Il6, Ccl3, and Ccl5 are dysregulated in the lincRNA-Cox2-deficient mice and can be rescued to wild type levels by crossing the deficient mice with our newly generated lincRNA-Cox2 transgenic mice, confirming that this gene functions in trans. Many genes are specifically regulated by lincRNA-Cox2 within alveolar macrophages originating from the bone marrow because the phenotype can be reversed by transplantation of wild type bone marrow into the lincRNA-Cox2-deficient mice. In conclusion, we show that lincRNA-Cox2 is a trans-acting long noncoding RNA that functions to regulate immune responses and maintain homeostasis within the lung at baseline and on LPS-induced ALI.
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Affiliation(s)
- Elektra Kantzari Robinson
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - Atesh Worthington
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA; and
| | - Donna Poscablo
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA; and
| | - Barbara Shapleigh
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - Mays Mohammed Salih
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - Haley Halasz
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - Lucas Seninge
- Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA
| | - Benny Mosqueira
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - Valeriya Smaliy
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA
| | - E Camilla Forsberg
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA; and
- Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA
| | - Susan Carpenter
- Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA;
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9
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Shotland AM, Fontenot AP, McKee AS. Pulmonary Macrophage Cell Death in Lung Health and Disease. Am J Respir Cell Mol Biol 2021; 64:547-556. [PMID: 33332993 DOI: 10.1165/rcmb.2020-0420tr] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Over the last several decades, our understanding of regulated-cell-death (RCD) pathways has increased dramatically. In addition to apoptosis and accidental cell death (primary necrosis), a diverse spectrum of RCD pathways has been delineated. In the lung, airway macrophages are critical for maintaining the functionality of airways via the clearance of inhaled particles, cell debris, and infectious agents. Exposure of these cells to pathogenic organisms or particles can induce a variety of RCD pathways that promote the release of danger signals into the lung. These responses have evolved to trigger the innate and adaptive arms of the immune system and thus offer protection against pathogens; yet they can also contribute to the development of lung injury and pathogenic immune responses. In this review, we discuss recent studies that suggest a critical role for airway-macrophage RCD pathways in promoting the release of pulmonary danger signals in health and disease.
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Affiliation(s)
- Abigail M Shotland
- Division of Allergy and Clinical Immunology, Department of Medicine, and
| | - Andrew P Fontenot
- Division of Allergy and Clinical Immunology, Department of Medicine, and.,Department of Microbiology and Immunology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
| | - Amy S McKee
- Division of Allergy and Clinical Immunology, Department of Medicine, and.,Department of Microbiology and Immunology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
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Abstract
PURPOSE OF REVIEW Previous studies mainly described a role for organic agents as possible triggers for sarcoidosis. In this review, we address recent studies suggesting a possible role for inorganic elements, such as metals or silica in sarcoidosis pathogenesis. RECENT FINDINGS Several epidemiological papers suggest that inorganic agents, either by environmental exposures or occupational activities, could trigger sarcoidosis. Association between inorganics and sarcoidosis is also described in several recently published case reports and studies demonstrating immunological sensitization to inorganic agents in sarcoidosis patients.Studies comparing chronic beryllium disease (CBD) and sarcoidosis suggest that although antigenic triggers may differ, underlying processes may be comparable.Besides the fact that a growing number of studies show a possible role for inorganic triggers, it is also suggested that inorganic triggered sarcoidosis may result in a more severe phenotype, including pulmonary fibrosis. SUMMARY We can use the knowledge already gained on CBD pathogenesis to conduct further research into role of inorganics, such as metals and silica as antigens in sarcoidosis. Given the importance of a lymphocyte proliferation test (LPT) in diagnosing CBD, it seems obvious to also implement this test in the diagnostic work-up of sarcoidosis to identify patients with an inorganic antigenic trigger of their disease.
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