1
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Iversen IB, Vestergaard JM, Ohlander J, Peters S, Bendstrup E, Bonde JPE, Schlünssen V, Bønløkke JH, Rasmussen F, Stokholm ZA, Andersen MB, Kromhout H, Kolstad HA. Occupational exposure to respirable crystalline silica and incident idiopathic interstitial pneumonias and pulmonary sarcoidosis: a national prospective follow-up study. Occup Environ Med 2024:oemed-2023-108964. [PMID: 38902031 DOI: 10.1136/oemed-2023-108964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 04/26/2024] [Indexed: 06/22/2024]
Abstract
BACKGROUND Respirable crystalline silica is a well-known cause of silicosis but may also be associated with other types of interstitial lung disease. We examined the associations between occupational exposure to respirable crystalline silica and the risk of idiopathic interstitial pneumonias, pulmonary sarcoidosis and silicosis. METHODS The total Danish working population was followed 1977-2015. Annual individual exposure to respirable crystalline silica was estimated using a quantitative job exposure matrix. Cases were identified in the Danish National Patient Register. We conducted adjusted analyses of exposure-response relations between cumulative silica exposure and other exposure metrics and idiopathic interstitial pneumonias, pulmonary sarcoidosis and silicosis. RESULTS Mean cumulative exposure was 125 µg/m3-years among exposed workers. We observed increasing incidence rate ratios with increasing cumulative silica exposure for idiopathic interstitial pneumonias, pulmonary sarcoidosis and silicosis. For idiopathic interstitial pneumonias and pulmonary sarcoidosis, trends per 50 µg/m3-years were 1.03 (95% CI 1.02 to 1.03) and 1.06 (95% CI 1.04 to 1.07), respectively. For silicosis, we observed the well-known exposure-response relation with a trend per 50 µg/m3-years of 1.20 (95% CI 1.17 to 1.23). CONCLUSION This study suggests that silica inhalation may be related to pulmonary sarcoidosis and idiopathic interstitial pneumonias, though these findings may to some extent be explained by diagnostic misclassification. The observed exposure-response relations for silicosis at lower cumulative exposure levels than previously reported need to be corroborated in analyses that address the limitations of this study.
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Affiliation(s)
- Inge Brosbøl Iversen
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Jesper Medom Vestergaard
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Johan Ohlander
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, The Netherlands
| | - Susan Peters
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, The Netherlands
| | - Elisabeth Bendstrup
- Center for Rare Lung Diseases, Department of Respiratory Diseases and Allergy, Aarhus University Hospital, Aarhus, Denmark
| | - Jens Peter Ellekilde Bonde
- Department of Occupational and Environmental Medicine, Bispebjerg and Frederiksberg Hospital, Copenhagen, Denmark
| | - Vivi Schlünssen
- Department of Public Health, Research Unit for Environment, Occupation and Health, Danish Ramazzini Centre, Aarhus University, Aarhus, Denmark
| | - Jakob Hjort Bønløkke
- Department of Occupational and Environmental Medicine, Danish Ramazzini Centre, Aalborg University Hospital, Aalborg, Denmark
| | - Finn Rasmussen
- Department of Radiology, Aarhus University Hospital, Aarhus, Denmark
| | - Zara Ann Stokholm
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
| | - Michael Brun Andersen
- Department of Radiology, Copenhagen University Hospital Herlev and Gentofte, Herlev, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Hans Kromhout
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, The Netherlands
| | - Henrik Albert Kolstad
- Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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2
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Panizzolo M, Barbero F, Ghelli F, Garzaro G, Bellisario V, Guseva Canu I, Fenoglio I, Bergamaschi E, Bono R. Assessing the inhaled dose of nanomaterials by nanoparticle tracking analysis (NTA) of exhaled breath condensate (EBC) and its relationship with lung inflammatory biomarkers. CHEMOSPHERE 2024; 358:142139. [PMID: 38688349 DOI: 10.1016/j.chemosphere.2024.142139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 03/26/2024] [Accepted: 04/23/2024] [Indexed: 05/02/2024]
Abstract
The widespread and increasing use of nanomaterials has resulted in a higher likelihood of exposure by inhalation for nanotechnology workers. However, tracking the internal dose of nanoparticles deposited at the airways level, is still challenging. To assess the suitability of particle number concentration determination as biomarker of internal dose, we carried out a cross sectional investigation involving 80 workers handling nanomaterials. External exposure was characterized by portable counters of particles DISCminiTM (Testo, DE), allowing to categorize 51 workers as exposed and 29 as non-exposed (NE) to nanoparticles. Each subject filled in a questionnaire reporting working practices and health status. Exhaled breath condensate was collected and analysed for the number of particles/ml as well as for inflammatory biomarkers. A clear-cut relationship between the number of airborne particles in the nano-size range determined by the particle counters and the particle concentration in exhaled breath condensate (EBC) was apparent. Moreover, inflammatory cytokines (IL-1β, IL-10, and TNF-α) measured in EBC, were significantly higher in the exposed subjects as compared to not exposed. Finally, significant correlations were found between external exposure, the number concentration of particles measured by the nanoparticle tracking analysis (NTA) and inflammatory cytokines. As a whole, the present study, suggests that NTA can be regarded as a reliable tool to assess the inhaled dose of particles and that this dose can effectively elicit inflammatory effects.
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Affiliation(s)
- Marco Panizzolo
- Department of Public Health and Pediatrics. University of Torino, Italy
| | | | - Federica Ghelli
- Department of Public Health and Pediatrics. University of Torino, Italy.
| | - Giacomo Garzaro
- Department of Public Health and Pediatrics. University of Torino, Italy
| | | | - Irina Guseva Canu
- Department of Occupational and Environmental Health, UniSanté, Lausanne, Switzerland
| | | | | | - Roberto Bono
- Department of Public Health and Pediatrics. University of Torino, Italy
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3
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Gai J, Liu L, Zhang X, Guan J, Mao S. Impact of the diseased lung microenvironment on the in vivo fate of inhaled particles. Drug Discov Today 2024; 29:104019. [PMID: 38729235 DOI: 10.1016/j.drudis.2024.104019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/19/2024] [Accepted: 05/03/2024] [Indexed: 05/12/2024]
Abstract
Inhalation drug delivery is superior for local lung disease therapy. However, there are several unique absorption barriers for inhaled drugs to overcome, including limited drug deposition at the target site, mucociliary clearance, pulmonary macrophage phagocytosis, and systemic exposure. Moreover, the respiratory disease state can affect or even destroy the physiology of the lung, thus influencing the in vivo fate of inhaled particles compared with that in healthy lungs. Nevertheless, limited information is available on this effect. Thus, in this review, we present pathological changes of the lung microenvironment under varied respiratory diseases and their influence on the in vivo fate of inhaled particles; such insights could provide a basis for rational inhalation particle design based on specific disease states.
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Affiliation(s)
- Jiayi Gai
- School of Pharmacy, Shenyang Key Laboratory of Intelligent Mucosal Drug Delivery Systems, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Liu Liu
- School of Pharmacy, Shenyang Key Laboratory of Intelligent Mucosal Drug Delivery Systems, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xin Zhang
- School of Pharmacy, Shenyang Key Laboratory of Intelligent Mucosal Drug Delivery Systems, Shenyang Pharmaceutical University, Shenyang 110016, China; Joint International Research Laboratory of Intelligent Drug Delivery Systems, Ministry of Education, China
| | - Jian Guan
- School of Pharmacy, Shenyang Key Laboratory of Intelligent Mucosal Drug Delivery Systems, Shenyang Pharmaceutical University, Shenyang 110016, China; Joint International Research Laboratory of Intelligent Drug Delivery Systems, Ministry of Education, China
| | - Shirui Mao
- School of Pharmacy, Shenyang Key Laboratory of Intelligent Mucosal Drug Delivery Systems, Shenyang Pharmaceutical University, Shenyang 110016, China; Joint International Research Laboratory of Intelligent Drug Delivery Systems, Ministry of Education, China.
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4
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Rezaei A, Ghafari ME, Sohrabi Y, Aliasghari F, Yousefinejad S, Soleimani E, Jafari S. Systemic inflammation indices as hematological biomarkers of inflammatory response in non-silicotic workers exposed to respirable silica dust. Toxicol Lett 2024; 395:26-39. [PMID: 38513876 DOI: 10.1016/j.toxlet.2024.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 03/11/2024] [Accepted: 03/18/2024] [Indexed: 03/23/2024]
Abstract
This cross-sectional study was performed to assess whether systemic inflammatory indices, including systemic inflammation response index (SIRI), systemic immune‑inflammation index (SII), and aggregate index of systemic inflammation (AISI), can be considered as possible inflammatory markers in silica-exposed workers with no diagnosis of silicosis. We studied 371 non-silicotic workers exposed to respirable silica dust (RSD) and 1422 reference workers. The workers' exposure to RSD were assessed and the inflammatory indices were compared between subgroups of the exposed workers based on the severity and duration of exposure. Correlations between inflammatory indices and the pulmonary function parameters were investigated. Also, the receiver operating characteristic (ROC) curve and Youden index were used to determine the cut-off values of the SII, SIRI, and AISI. Significant dose-response relationships were observed between duration of exposure and all indices except monocytes and LMR. No significant interaction was observed between duration of exposure to RSD and smoking. Borderline significant correlations were observed between AISI and SIRI with forced expiratory volume (FEV1) and FEV1 to forced vital capacity (FVC) ratio. Higher AUCs were obtained for SII and AISI, respectively. The cut-off values for these biomarkers to be considered abnormal were > 348.48 for SII, > 183.78 for AISI, and > 0.768 for SIRI. Overall, the present study showed for the first time, that SII, AISI, and SIRI might be considered as available, easy-to-obtain, and non-expensive markers of inflammation in non-silicotic workers with a long duration of exposure to RSD who are at risk of developing silicosis in subsequent years.
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Affiliation(s)
- Amirmohammad Rezaei
- Department of Occupational Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Ebrahim Ghafari
- Department of Epidemiology and Biostatistics, Faculty of Health, Qom University of Medical Sciences, Qom, Iran
| | - Younes Sohrabi
- Department of Occupational Health and Safety Engineering, Shoushtar Faculty of Medical Sciences, Shoushtar, Iran
| | - Fereshteh Aliasghari
- Department of Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saeed Yousefinejad
- Department of Occupational Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Esmaeel Soleimani
- Department of Occupational Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Saeed Jafari
- Department of Occupational Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
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Davaajav K, Dagva D, Dashtseren I, Takahashi Y, Nakayama T. Elevated Levels of the Cancer Marker Neuron-Specific Enolase in a Patient With Coexisting Silicosis and Sarcoidosis. Cureus 2024; 16:e61130. [PMID: 38919222 PMCID: PMC11198998 DOI: 10.7759/cureus.61130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/26/2024] [Indexed: 06/27/2024] Open
Abstract
In a periodical medical checkup, a 39-year-old Mongolian underground miner was diagnosed with silicosis based on chest radiography, computed tomography (CT), and work history. Chest radiography showed diffuse bilateral rounded nodules in both lung fields, with upper lobe dominance and large opacities in the right upper zone. Chest CT presented conglomerated massive changes in the right upper lobe and the coalescence of small nodules in the left upper lung. In the blood test, serum levels of the lung cancer marker neuron-specific enolase (NSE) were elevated (24.58 ng/mL). Carcinoembryonic antigen (CEA) and cytokeratin 19 fragment (CYFRA 21-1) levels were within the reference range. Subsequent to the suspicion of a tumour in the right upper lobe, a right upper lobectomy was performed. The histopathological examination of the lung specimen revealed the coalescence of numerous silica nodules, accompanied by indications of associated sarcoidosis. The histological features suggested the presence of two concurrent pathological processes: silicosis and sarcoidosis. This case demonstrated the combination of three clinical conditions diagnosed in one patient, including complicated silicosis associated with sarcoidosis and elevated serum NSE levels. This case report may serve as a foundation for future investigations exploring the potential of NSE as a marker for silicosis.
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Affiliation(s)
| | - Dolgormaa Dagva
- Forensic Medicine, National Forensic Agency of Mongolia, Ulaanbaatar, MNG
| | - Ichinnorov Dashtseren
- Pulmonology and Allergology, Mongolian National University of Medical Sciences, School of Medicine, Ulaanbaatar, MNG
| | | | - Takeo Nakayama
- Health Informatics, Kyoto University, Graduate School of Medicine, Kyoto, JPN
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Tumusime R, Miller MS, Niyigena A, Dusabeyezu S, Uwitonze P, Harerimana E, Umugiraneza G, Dusingizimana W, Hatfield S, Savarimuthu S, Lawrence J, Hagenimana P, Ngenzi JMV, Murara A, Mwiseneza P, Sonenthal P, Cubaka VK, Kateera F, Kamali I. Implementation and Cost Analysis of a Novel Silicosis Case-Finding Program For Mine Workers in Rural Rwanda. GLOBAL HEALTH, SCIENCE AND PRACTICE 2024; 12:e2300290. [PMID: 38485283 PMCID: PMC11057793 DOI: 10.9745/ghsp-d-23-00290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 02/27/2024] [Indexed: 03/21/2024]
Abstract
Little is known about the burden of silicosis in Africa, despite extensive mining and construction operations in the region putting numerous people at risk. The implementation experience and costs of case-finding for occupational lung disease in resource-limited settings are also currently unknown. We describe the first-ever silicosis case-finding project in rural Rwanda using chest X-ray, symptom questionnaires, and spirometry. This was coupled with routine noncommunicable disease case-finding for diabetes and hypertension. We performed an ingredient-based analysis of the costs of all case-finding activities. In 2022, over 25 days, 1,032 mine workers were included in the program, of which 1,014 (98.3%) completed silicosis case-finding activities. The total cost of the program was estimated to be US$38,656, representing a cost of US$37.49 per person. We conclude that conducting large-scale occupational lung disease case-finding is clinically and economically feasible in resource-limited settings and can be effectively integrated with routine noncommunicable disease case-finding.
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Affiliation(s)
- Robert Tumusime
- Partners In Health-Rwanda/Inshuti Mu Buzima, Rwinkwavu, Rwanda
| | - Michael S Miller
- Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA.
| | - Anne Niyigena
- Partners In Health-Rwanda/Inshuti Mu Buzima, Rwinkwavu, Rwanda
| | | | | | | | | | - Wellars Dusingizimana
- Ministry of Health of Rwanda, Kigali, Rwanda
- Rwinkwavu District Hospital, Kayonza, Rwanda
| | - Samuel Hatfield
- Department of Medicine, University of California at San Francisco, San Francisco, CA, USA
| | | | - Juliana Lawrence
- Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | | | | | | | - Phoebe Mwiseneza
- Ministry of Health of Rwanda, Kigali, Rwanda
- Rwinkwavu District Hospital, Kayonza, Rwanda
| | - Paul Sonenthal
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
- Partners In Health, Boston, MA, USA
| | | | | | - Innocent Kamali
- Partners In Health-Rwanda/Inshuti Mu Buzima, Rwinkwavu, Rwanda
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7
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Abstract
PURPOSE OF REVIEW There has been a rapid increase in silicosis cases, particularly related to artificial stone. The key to management is avoidance of silica exposure. Despite this, many develop progressive disease and there are no routinely recommended treatments. This review provides a summary of the literature pertaining to pharmacological therapies for silicosis and examines the plausibility of success of such treatments given the disease pathogenesis. RECENT FINDINGS In-vitro and in-vivo models demonstrate potential efficacy for drugs, which target inflammasomes, cytokines, effector cells, fibrosis, autophagy, and oxidation. SUMMARY There is some evidence for potential therapeutic targets in silicosis but limited translation into human studies. Treatment of silicosis likely requires a multimodal approach, and there is considerable cross-talk between pathways; agents that modulate both inflammation, fibrosis, autophagy, and ROS production are likely to be most efficacious.
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Affiliation(s)
- Hayley Barnes
- Monash Centre for Occupational and Environmental Health, Monash University
- Department of Respiratory Medicine, Alfred Health
- Central Clinical School, Monash University, Melbourne
| | - Maggie Lam
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton
- Department of Molecular and Translational Sciences, Monash University, Clayton, Victoria, Australia
| | - Michelle D Tate
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton
- Department of Molecular and Translational Sciences, Monash University, Clayton, Victoria, Australia
| | - Ryan Hoy
- Monash Centre for Occupational and Environmental Health, Monash University
- Department of Respiratory Medicine, Alfred Health
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8
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McCool H, Evans A, Vinan Vega M, Nugent K. Prolonged cough and dyspnea following a single episode of intense silica exposure. ARCHIVES OF ENVIRONMENTAL & OCCUPATIONAL HEALTH 2024; 78:501-506. [PMID: 38095547 DOI: 10.1080/19338244.2023.2293939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/28/2023] [Indexed: 02/08/2024]
Abstract
Long term exposure to silica at worksites can cause silicosis. This typically has two radiographic forms, simple silicosis and complicated or conglomerate silicosis. Patients with acute silicosis have rapid progression of disease with fulminant respiratory failure over months rather than years. The patient described in this case report had a one-time 4 to 5-h exposure to silica and sand dust at work when his mask malfunctioned. He developed cough and shortness of breath. During his initial clinic visit he had significant cough. His chest examination was clear without crackles or wheezes. His pulmonary function tests were within normal limits. His chest x-ray was clear. Both symptoms, especially the cough, persisted over the next 6+ months even after treatment with oral corticosteroids and inhaled corticosteroids and long-acting beta agonists. Consequently, this patient developed severe cough following a one-time exposure to silica particulates. Laboratory studies have demonstrated that silica exposure can cause reactive oxygen species which potentially could have activated transient receptor potential vanilloid 1 channels in the afferent sensory nerves in his bronchial epithelium. This could cause sustained cough for more than 6 months. His symptoms improved but did not resolve with corticosteroid treatment. Therefore, this case demonstrates that acute silica exposure can cause sustained airway symptoms in healthy workers.
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Affiliation(s)
- Hannah McCool
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Abbie Evans
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Myrian Vinan Vega
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Kenneth Nugent
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
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Patro M, Girija A, Sarkar S, Mohapatra PR, Shirgaokar R. Exploring the Impact of Occupational Silica Exposure Progressing to Systemic Sclerosis: A Report on the Development of Silica-Induced Systemic Sclerosis Cases. Cureus 2024; 16:e54595. [PMID: 38524014 PMCID: PMC10958239 DOI: 10.7759/cureus.54595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2024] [Indexed: 03/26/2024] Open
Abstract
Erasmus syndrome is an uncommon disease brought on by exposure to silica and later manifests as systemic sclerosis (SSc) with or without silicosis. The body of literature on Erasmus syndrome is scarce. Here, we report two cases of male patients presenting with SSc after silica exposure. One of the patients had worked in the steel industry, and another had worked in the sculpture manufacturing for a decade before the presentation. It is imperative to raise awareness of this uncommon illness because avoiding further exposure remains the mainstay of management. Our case reports reemphasize the importance of occupational history in all patients of SSc.
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Affiliation(s)
- Mahismita Patro
- Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Bhubaneswar, IND
| | - Aswathy Girija
- Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Bhubaneswar, IND
| | - Subho Sarkar
- Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Bhubaneswar, IND
| | - Prasanta R Mohapatra
- Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Bhubaneswar, IND
| | - Rohit Shirgaokar
- Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Bhubaneswar, IND
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Kumari J, Advani M, Purohit G. Prevalence of pulmonary hypertension in chronic simple silicosis patients and its correlation with smoking history, occupation type, age and duration of silica exposure. Monaldi Arch Chest Dis 2023. [PMID: 38037897 DOI: 10.4081/monaldi.2023.2719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 11/15/2023] [Indexed: 12/02/2023] Open
Abstract
Silicosis is a preventable occupational health hazard with potential for permanent physical disability and increased socio-economic burden. Pulmonary hypertension (PH) secondary to chronic respiratory diseases signifies poorer prognosis and transthoracic echocardiography (TTE) has proven its usefulness as a screening tool for PH diagnosis. The objectives were to determine PH prevalence in chronic simple silicosis patients through TTE screening and correlate PH prevalence with smoking status, occupation type, age and duration of silica exposure (DSE). We enrolled 104 patients in the study based on occupational exposure to silica dust and radiologic confirmation of chronic simple silicosis. The study sample was divided into significant smokers (SS group) and insignificant smokers (InS group) on the basis of ≥10 pack years smoking history, and into drillers and dressers based on occupation type. TTE examination was performed to measure resting mean pulmonary artery pressure (mPAP) and the patients were classified into: no PH (mPAP≤20 mm Hg), borderline PH (mPAP>20 and <25 mmHg), and PH (mPAP≥25). PH prevalence was 25% in study subjects (26/104); 29.6% (16/54) among SS group versus 20% (10/50) among InS group (.52) ; and 34.2% (14/41) among drillers versus 19.1% (12/63) among dressers (p=.024). Mean age and mean duration of silica exposure among SS and InS groups were comparatively similar, while they had lower values among dressers against dressers with no statistical significance. Logistic regression analysis established a significant association of PH prevalence with higher age in the study sample, SS group and drillers group, while a significant association of PH prevalence with longer DSE was only seen in the study sample. PH prevalence was significantly associated (p=.007) with SS-driller group on comparing TTE findings with combined smoking and occupation type based groups. This study has shown PH prevalence in chronic simple silicosis patients at alarming levels, having associations with driller occupation, older age and longer DSE with varying results among groups and complex interplay with smoking exposure, suggesting the need for large sample-based molecular and genetic studies. Including TTE in the initial work-up of silicosis patients will promote timely intervention and reduce morbidity and mortality with a high benefit-cost ratio.
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Affiliation(s)
- Jyoti Kumari
- Department of Respiratory Medicine, Pacific Medical College and Hospital, Udaipur, Rajasthan.
| | - Manish Advani
- Department of Respiratory Medicine, Pacific Medical College and Hospital, Udaipur, Rajasthan.
| | - Gopal Purohit
- Department of Respiratory Medicine, Dr. Sampurnanand Medical College, Jodhpur, Rajasthan.
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11
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Xue Y, Miao L, Xu P, Yang X, Qu M, Lai H. Potential Effect of Combined Exposure of Crystalline Silica Dust and Cigarette Smoking on the Incidence of Silicosis among Chinese Male Stone Processing Workers: A Cross-Sectional Study. Healthcare (Basel) 2023; 11:2260. [PMID: 37628458 PMCID: PMC10454731 DOI: 10.3390/healthcare11162260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/29/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
Background: Silicosis is a progressive and irreversible disease primarily caused by exposure to crystalline silica dust and, to a lesser extent, cigarette smoking. However, further research is needed to validate the potential combined effect of these risk factors on the increased incidence of the disease. Methods: A total of 1688 male workers employed at a Chinese stone processing plant between 1 January 1999 and 31 December 2019, were included in the study. Cumulative exposure to industrial crystalline silica dust and packyears of smoking were collected through health surveillance, and odds ratios (ORs) with 95% confidence intervals (CIs) for silicotic changes due to industrial silica exposure and cigarette smoking were estimated using logistic regression models. Results: Among all participants, a significant exposure-response relationship was observed between long-term exposure to industrial silica dust and radiographic findings resembling silicosis (OR 1.74, 95% CI 1.25 to 2.41). However, among middle-aged workers, a weak and statistically insignificant relationship was found between prolonged cigarette smoking and X-ray evidence of lung silicosis (OR 1.59, 95% CI 1.00 to 2.53). Furthermore, significant combined effects, exceeding the additive models, were identified in each age group and employment sector (relative risk due to interaction 0.51, 95% CI 0.08 to 3.42). Conclusions: It is critically important to implement effective dust removal measures and tobacco control strategies in order to enhance respiratory health among employees across all age groups in the stone processing industry.
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Affiliation(s)
- Yu Xue
- Department of Radiology and Functional Examination, Nanjing Prevention and Treatment Center for Occupational Diseases, Nanjing 210018, China; (Y.X.); (P.X.)
| | - Long Miao
- Department of Occupational and Environmental Health, School of Public Health, Yangzhou University, Yangzhou 225009, China; (L.M.); (M.Q.)
| | - Ping Xu
- Department of Radiology and Functional Examination, Nanjing Prevention and Treatment Center for Occupational Diseases, Nanjing 210018, China; (Y.X.); (P.X.)
| | - Xinglong Yang
- Department of Clinical Medicine, School of Medicine, Yangzhou University, Yangzhou 225009, China;
| | - Man Qu
- Department of Occupational and Environmental Health, School of Public Health, Yangzhou University, Yangzhou 225009, China; (L.M.); (M.Q.)
| | - Hanpeng Lai
- Department of Occupational and Environmental Health, School of Public Health, Yangzhou University, Yangzhou 225009, China; (L.M.); (M.Q.)
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12
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Zhao Y, Qu Y, Duan M, Hao C, Yao W. Dynamics of the inhibitory immune checkpoint TIM-3 in mouse pulmonary phagocytes after silica exposure. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 261:115087. [PMID: 37285680 DOI: 10.1016/j.ecoenv.2023.115087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/06/2023] [Accepted: 05/28/2023] [Indexed: 06/09/2023]
Abstract
Long-term inhalation of silica particles in the workplace causes silicosis, which is incurable and seriously endangers the health of workers. It is believed that silicosis is caused by an imbalance of the pulmonary immune microenvironment, in which pulmonary phagocytes play a crucial role. As an emerging immunomodulatory factor, it is unclear whether T cell immunoglobulin and mucin domain-containing protein 3 (TIM3) participate in silicosis by modulating pulmonary phagocytes function. The purpose of this study was to investigate the dynamic changes of the TIM-3 in pulmonary macrophages, dendritic cells (DCs), and monocytes during the development of silicosis in mice. The plasma levels of soluble TIM-3 in silicosis patients were also examined. Flow cytometry was used to identify alveolar macrophages (AMs), interstitial macrophages (IMs), CD11b+ DC, CD103+ DC, Ly6C+, and Ly6C- monocytes in mouse lung tissues, and further analyses were conducted on the expression of TIM-3. Results showed that soluble TIM-3 was significantly elevated in plasma of silicosis patients, and the level of which was higher in stage II and III patients than that in stage I. In silicosis mice, the protein and mRNA levels of TIM-3 and Galectin9 were significantly upregulated in lung tissues. Specific to pulmonary phagocytes, silica exposure affected TIM-3 expression in a cell-specific and dynamic manner. In macrophages, TIM-3 expression upregulated in AM after 28 days and 56 days of silica instillation, while the expression of TIM-3 in IM decreased at all observation time points. In DCs, silica exposure only caused a decrease of TIM-3 expression in CD11b+ DCs. In monocytes, TIM-3 dynamics in Ly6C+ and Ly6C- monocytes were generally consistent during silicosis development, which significant decrease after 7 and 28 days of silica exposure. In conclusion, TIM-3 may mediate the development of silicosis by regulating pulmonary phagocytes.
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Affiliation(s)
- Youliang Zhao
- Department of Occupational Health and Occupational Disease, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Yaqian Qu
- Department of Occupational Health and Occupational Disease, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Meixiu Duan
- Department of Occupational Health and Occupational Disease, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Changfu Hao
- Department of Occupational Health and Occupational Disease, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China.
| | - Wu Yao
- Department of Occupational Health and Occupational Disease, College of Public Health, Zhengzhou University, Zhengzhou, Henan, PR China.
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Jamshidi P, Danaei B, Arbabi M, Mohammadzadeh B, Khelghati F, Akbari Aghababa A, Nayebzade A, Shahidi Bonjar AH, Centis R, Sotgiu G, Nasiri MJ, Migliori GB. Silicosis and tuberculosis: A systematic review and meta-analysis. Pulmonology 2023:S2531-0437(23)00092-2. [PMID: 37349198 DOI: 10.1016/j.pulmoe.2023.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/03/2023] [Accepted: 05/03/2023] [Indexed: 06/24/2023] Open
Abstract
INTRODUCTION Silicosis mostly happens in workers with high silica exposure and may accompany the development of various diseases like tuberculosis, cancer, or autoimmune diseases. The term silico-tuberculosis describes a condition in which an individual is affected by both silicosis and tuberculosis at the same time. This systematic review and meta-analysis study was conducted to evaluate the risk of tuberculosis in silicosis patients and individuals exposed to silica dust. METHODS We performed a systematic search for relevant studies up to 6 September 2022 using PubMed/ Medline, and Embase with the following keywords in titles or abstracts: "silicosis" OR "silicoses" OR "pneumoconiosis" OR "pneumoconioses" AND "tuberculosis". Cohort and case-control studies containing relevant and original information about tuberculosis infection in silicosis patients were included for further analysis. Pooled estimates and 95% confidence intervals (CI) for the relative risk of tuberculosis in individuals with silicosis compared to those without; these were evaluated using the random effects model due to the estimated heterogeneity of the true effect sizes. RESULTS Out of 5352 potentially relevant articles, 7 studies were eligible for systematic review, of which 4 cohort studies were included for meta-analysis. The total population of all studies was 5884, and 90.63% were male. The mean age of participants was 47.7 years. Our meta-analysis revealed a pooled risk ratio of 1.35 (95%CI 1.18-1.53, I 2: 94.30%) which means an increased risk of silicosis patients and silica-exposed individuals to tuberculosis infection. CONCLUSION Silicosis and silica dust exposure increase the risk of tuberculosis. Therefore, we suggest that individuals with long-time silica exposure, like mine workers, be routinely considered for both silicosis and tuberculosis screening programs.
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Affiliation(s)
- P Jamshidi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Center of Public Health, Environmental and Occupational Hazards Control, Shahid Beheshti University of Medical Science, Tehran, Iran
| | - B Danaei
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - M Arbabi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - B Mohammadzadeh
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - F Khelghati
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Akbari Aghababa
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Nayebzade
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A H Shahidi Bonjar
- Researcher at the National Institute for Medical Research Development (NIMAD), Deputy of Research and Technology, Ministry of Health and Medical Education, Tehran, Iran; Clinician Scientist of Dental Materials and Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - R Centis
- Servizio di Epidemiologia Clinica delle Malattie Respiratorie, Istituti Clinici Scientifici Maugeri IRCCS, Tradate, Italy
| | - G Sotgiu
- Clinical Epidemiology and Medical Statistics Unit, Department of Medicine, Surgery and Pharmacy, University of Sassari, Italy.
| | - M J Nasiri
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - G B Migliori
- Servizio di Epidemiologia Clinica delle Malattie Respiratorie, Istituti Clinici Scientifici Maugeri IRCCS, Tradate, Italy.
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Yi Z, Dong S, Wang X, Xu M, Li Y, Xie L. Exploratory study on noninvasive biomarker of silicosis in exhaled breath by solid-phase microextraction-gas chromatography-mass spectrometry analysis. Int Arch Occup Environ Health 2023:10.1007/s00420-023-01971-y. [PMID: 37067574 DOI: 10.1007/s00420-023-01971-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 03/25/2023] [Indexed: 04/18/2023]
Abstract
BACKGROUND As a chronic occupational disease, silicosis could cause irreversible and incurable impair to the lung. The current diagnosis of silicosis relies on imaging of X-ray or CT, but these methods cannot detect lung lesions in the early stage of silicosis. OBJECTIVE To establish a regular screening and early diagnosis methods for silicosis, which could be helpful for the prevention and treatment of silicosis. METHODS A total of 161 subjects were enrolled in the study, including 69 patients with silicosis (SILs) and 92 healthy controls. The exhaled breath samples of the subjects were collected with breath sampler and Tedlar bag. The analysis of volatile organic compounds (VOCs) in exhaled breath was performed by solid-phase microextraction (SPME) combined with gas chromatography mass spectrometry (GC-MS). RESULTS After excluding the pollutants from sampling bags and instruments, 86 VOCs have been identified in the exhaled breath. The orthogonal partial least squares-discriminant analysis (OPLS-DA) was employed for the screening of potential biomarkers of silicosis. Those components that related to smoking were also excluded from the biomarkers. Finally, nine possible biomarkers for silicosis were screened out, including 2,3-butanedione, ethyl acetate, chlorobenzene, o-cymene, 4-ethylhex-2-ynal, 3,5-dimethyl-3-heptanol, hydroquinone, phthalic anhydride and 5-(2-methylpropyl)nonane. Based on these biomarkers screened, a predicted model for silicosis was generated with the accuracy of 89.61%. CONCLUSION The nine biomarkers in exhaled breath were preliminarily screened out for the early diagnosis of silicosis, which can be helpful to the establishment of a noninvasive screening method for silicosis. Follow-up studies should be conducted to further verify these markers.
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Affiliation(s)
- Zonghui Yi
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China
| | - Simin Dong
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China
| | - Xixi Wang
- Chengdu Center for Disease Control and Prevention, Chengdu, 610066, China
| | - Mucen Xu
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China
| | - Yongxin Li
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China.
- Research Center for Nutrition, Metabolism and Food Safety, West China-PUMC C.C. Chen Institute of Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China.
| | - Linshen Xie
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, 610041, China.
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15
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Anlimah F, Gopaldasani V, MacPhail C, Davies B. A systematic review of the effectiveness of dust control measures adopted to reduce workplace exposure. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:54407-54428. [PMID: 36964805 PMCID: PMC10121514 DOI: 10.1007/s11356-023-26321-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
The recent increase in silicosis cases in several countries casts doubt on dust control practices and their effectiveness in preventing respirable crystalline silica (RCS) exposure. Apart from silicosis, RCS may lead to other illnesses, health-related quality of life losses for workers and their families, and economic losses for companies. Thus, this systematic literature review examined the effectiveness of interventions employed to prevent exposure to RCS and increase the use of dust control measures. The review used keywords related to dust control interventions to search seven databases. Search results were screened and extracted for synthesis. The narrative synthesis showed the extent of research investment in China. In several designs and combinations, the interventions utilized water, surfactant, foam, and air currents to reduce dust exposure. These interventions offer varying degrees of dust control effectiveness against RCS and respirable dust. Although evidence indicates that interventions significantly decrease dust concentration levels, the control measures in place may not effectively prevent workplace overexposure to RCS. The review found that education and training interventions are employed to improve dust controls and respiratory protective equipment (RPE) use. Also, marketing strategies promote the use of RPE. These interventions can increase the frequency of use of RPE and the adoption of best practice dust control measures. Interventions increase knowledge, awareness, and attitudes about RPE usage and generate positive perceptions while reducing misconceptions. However, the benefits obtained from an intervention may diminish after its implementation, indicating that the interventions may not continually motivate workers to adopt control measures or use RPE.
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Affiliation(s)
- Frederick Anlimah
- Faculty of the Arts, Social Sciences and Humanities, School of Health and Society, Centre for Occupational Public and Environmental Research in Safety and Health (COPERSH), University of Wollongong, Building 29, Wollongong, NSW 2522 Australia
| | - Vinod Gopaldasani
- Faculty of the Arts, Social Sciences and Humanities, School of Health and Society, Centre for Occupational Public and Environmental Research in Safety and Health (COPERSH), University of Wollongong, Building 29, Room 124, Wollongong, NSW 2522 Australia
| | - Catherine MacPhail
- Faculty of the Arts, Social Sciences and Humanities, School of Health and Society, University of Wollongong, Building 29, Room 242, Wollongong, NSW 2522 Australia
| | - Brian Davies
- Faculty of the Arts, Social Sciences and Humanities, School of Health and Society, Centre for Occupational Public and Environmental Research in Safety and Health (COPERSH), University of Wollongong, Building 29, Room 116, Wollongong, NSW 2522 Australia
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16
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Walker RT, Illanes O, Conan A, Williams BH, Hilchie D, Bolfa P. Histology, prevalence, and environmental sources for pulmonary silicates depositions in domestic and wild animals. Vet Pathol 2023; 60:245-257. [PMID: 36636952 DOI: 10.1177/03009858221146095] [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: 01/14/2023]
Abstract
The source and significance of pulmonary silicate crystals in animals and people are poorly understood. To estimate the prevalence and characterize the pulmonary crystalline material in animals from St. Kitts, tissue samples from dogs, horses, cattle, sheep, goats, pigs, chickens, mongooses, and monkeys were examined by light microscopy, scanning electron microscopy with energy-dispersive x-ray analysis (SEM/EDXA), and x-ray diffraction. Crystalline material was seen in 201 of 259 (77.6%) lung samples as perivascular and interstitial accumulations of heterogeneous crystalline particulate material, free or within macrophages (silicate-laden macrophages [SLMs]), mostly lacking evidence of chronic inflammation or fibrosis. The crystalline material was birefringent, basophilic on acid-fast, and composed of silicas on SEM/EDXA. Mongooses (100%) and monkeys (98%) had the highest prevalence of SLM, followed by cattle and chickens. Lesions were graded on a 3-point scale based on the histologic location and extent of silicates and SLM and were significantly more severe in mongooses (median = 3) than in monkeys (median = 2), dogs (median = 2), and chickens (median = 1). On EDXA, the crystalline material from lungs, air, and topsoil was composed of silicon, oxygen, aluminum, and iron, with a particulate matter size between 2.5 and 10 µm. We hypothesize Saharan dust, volcanic ash, topsoil, and rock quarry dust are potential sources of siliceous dust inhalation and SLM accumulations lacking chronic inflammation (silicosis); dust generation may be potentiated by road vehicle or wind suspension. Future investigations are warranted on the role of silicate inhalation and respiratory comorbidities in people, with monkeys, mongooses, or chickens serving as possible sentinels for exposure.
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Affiliation(s)
- Randall T Walker
- Ross University School of Veterinary Medicine, Basseterre, St. Kitts & Nevis.,University of Florida, Gainesville, FL
| | - Oscar Illanes
- Ross University School of Veterinary Medicine, Basseterre, St. Kitts & Nevis.,Long Island University College of Veterinary Medicine, Brookville, NY
| | - Anne Conan
- Ross University School of Veterinary Medicine, Basseterre, St. Kitts & Nevis.,City University of Hong Kong, Kowloon, Hong Kong
| | | | - David Hilchie
- Ross University School of Veterinary Medicine, Basseterre, St. Kitts & Nevis
| | - Pompei Bolfa
- Ross University School of Veterinary Medicine, Basseterre, St. Kitts & Nevis
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17
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Barnes H, Glaspole I. Occupational Interstitial Lung Diseases. Immunol Allergy Clin North Am 2023; 43:323-339. [PMID: 37055091 DOI: 10.1016/j.iac.2023.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Occupational exposures are directly causal or partially contributory to the development of interstitial lung diseases. A detailed occupational history, relevant high-resolution computed tomography findings, and where relevant additional histopathology, are required to make a diagnosis. Treatment options are limited, and further exposure avoidance is likely to reduce disease progression.
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18
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Gangwar V, John N, Verma M, John J, Jasrotia RB, Singh A. Evaluation of Lung Functions, Blood Pressure, and Hearing Deterioration in Tile Setters. Cureus 2023; 15:e35250. [PMID: 36968923 PMCID: PMC10034865 DOI: 10.7759/cureus.35250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
INTRODUCTION Tile setters in construction industries are exposed to a potent risk of silicosis as they are constantly exposed to crystalline silica dust during concrete finishing, cutting and fixing of the ceramic tiles. The noise produced by instruments used in tile settings may lead to noise-induced hearing loss. Noise above the permissible limit of 85 dB may lead to autonomic changes and alteration in blood pressure. These facts gave us an impetus to evaluate the pulmonary functions, blood pressure and hearing deterioration in tile setters and correlate these parameters for their present functional status with duration of exposure to tile cutting profession. METHODS The pulmonary functions were evaluated with spirometer, autonomic status by recording the blood pressure and hearing loss by calculating the Hearing Deterioration Index (HDI) for hearing loss. RESULTS There was significant decline in forced vital capacity (FVC), forced expiratory volume 1 sec (FEV1) and forced expiratory volume 1% (FEV1%) in tile setters. The decline in FVC, FEV1 and FEV1% was significantly higher in subjects with exposure of more than five years. There was increased systolic and diastolic blood pressure in those having more than five years of exposure in the tile setting profession as compared to less than five years. There was a positive correlation between years of service in the tile setting profession as well as sound exposure level with HDI and blood pressure in our subjects. CONCLUSION Prolonged exposure to the tile setting profession may lead to compromised lung function, hypertension and hearing deterioration in tile setters.
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Rafieepour A, R Azari M, Khodagholi F. Cytotoxic effects of crystalline silica in form of micro and nanoparticles on the human lung cell line A549. Toxicol Ind Health 2023; 39:23-35. [PMID: 36433804 DOI: 10.1177/07482337221140644] [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: 11/28/2022]
Abstract
Airborne crystalline silica (SiO2) particles are one of the most common pollutants in stone industries. Limited studies have investigated the health effects of crystalline SiO2 nanoparticles. Hence, the objective of this study was to study the cytotoxicity of SiO2 in nano and micron sizes. A mineral quartz sample in the range of 0.2-0.8 mm sizes was purchased. These particles were ground at about 5 and 0.1 microns. Human cell line A549 was exposed to micro and nanometer particles at concentrations of 10, 50, 100, and 250 μg/ml for 24 and 72 h. Subsequently, the cytotoxicity of exposed cells was investigated by measuring cell survival, ROS generation, mitochondrial permeability, and intracellular glutathione content. The results showed that crystalline SiO2 nano and microparticles decreased cell survival, increased ROS generation, damaged the mitochondrial membrane, and lowered the antioxidant content of these cells in a concentration- and time-dependent manner. The toxicity of crystalline SiO2 microparticles at concentrations ≤50 μg/mL was greater than for nanoparticles, which was the opposite at concentrations ≥100 μg/mL. Exposure time and concentration were crucial factors for the cytotoxicity of exposed A549 cells to crystalline SiO2 particles, which can affect the severity of the effect of particle size. Due to the limitation of exposure concentration and test durations in this study, further studies on the parameters of nanoparticle toxicity and underlying mechanisms could advance our knowledge.
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Affiliation(s)
- Athena Rafieepour
- Occupational Health Research Center, Department of Occupational Health, School of Public Health, 440827Iran University of Medical Sciences, Tehran, Iran
| | - Mansour R Azari
- Department of Occupational Health, School of Public Health and Safety, 216617Shahid Beheshti University of Medical Science, Tehran, Iran
| | - Fariba Khodagholi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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The Role of Pulmonary Surfactant Phospholipids in Fibrotic Lung Diseases. Int J Mol Sci 2022; 24:ijms24010326. [PMID: 36613771 PMCID: PMC9820286 DOI: 10.3390/ijms24010326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/13/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
Diffuse parenchymal lung diseases (DPLD) or Interstitial lung diseases (ILD) are a heterogeneous group of lung conditions with common characteristics that can progress to fibrosis. Within this group of pneumonias, idiopathic pulmonary fibrosis (IPF) is considered the most common. This disease has no known cause, is devastating and has no cure. Chronic lesion of alveolar type II (ATII) cells represents a key mechanism for the development of IPF. ATII cells are specialized in the biosynthesis and secretion of pulmonary surfactant (PS), a lipid-protein complex that reduces surface tension and minimizes breathing effort. Some differences in PS composition have been reported between patients with idiopathic pulmonary disease and healthy individuals, especially regarding some specific proteins in the PS; however, few reports have been conducted on the lipid components. This review focuses on the mechanisms by which phospholipids (PLs) could be involved in the development of the fibroproliferative response.
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Effects of early dexamethasone treatment on several markers of inflammation and fibrosis in an animal model of lung silicosis in rats – A pilot study. ACTA MEDICA MARTINIANA 2022. [DOI: 10.2478/acm-2022-0012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Abstract
Lung silicosis is primarily caused by inhalation of particles of silicon oxide (silica). Despite a huge progress in understanding the interactions among the pathomechanisms of lung silicosis in the last years, there is a lack of effective therapy. With respect to a wide therapeutic action of corticosteroids, the purpose of this pilot study was to evaluate early effects of dexamethasone on several markers of inflammation and lung fibrosis in a rat model of silicosis. The silicosis model was induced by a single transoral intratracheal instillation of silica (50 mg/ml/animal), while the controls received an equivalent volume of sterile saline. The treatment with intraperitoneal dexamethasone initiated the next day after the silica instillation and was given 2-times a week at a dose of 1 mg/kg, while the controls received an equivalent volume of saline. The animals were euthanized 14 or 28 days after the treatment onset. Total and differential counts of leukocytes in the blood and bronchoalveolar lavage (BAL) fluid were determined. The presence of collagen in the bronchioles and lung vessels was detected by Sirius red staining and a smooth muscle mass was detected by smooth muscle actin. In comparison to saline, the instillation of silica increased the total count of circulating leukocytes after 14 and 28 days of the experiment (both p<0.05), which was associated with higher counts of lymphocytes (p<0.05 after 14 days, p>0.05 after 28 days) and slight but non-significant increases in neutrophils and eosinophils (both p>0.05). Although the total cell count in the BAL fluid did not change significantly, the percentages and absolute counts of neutrophils, eosinophils, and lymphocytes (p<0.05, p<0.01 or p<0.001) elevated after 14 and 28 days of the experiment. Silica induced an accumulation of collagen in the bronchioles (p<0.001 after both 14 and 28 days) and pulmonary vessels (p<0.01 after both 14 and 28 days) and elevated a formation of smooth muscle mass (p<0.05 after 14 days, p<0.01 or p<0.001 after 28 days). Treatment with dexamethasone decreased circulating leukocytes (p<0.01) and lymphocytes (p<0.001) and increased neutrophils (p<0.05), which was associated with a slightly decreased total cell count in BAL (p>0.05), decline in lymphocytes (p<0.01), and slight decreases in neutrophils and eosinophils after 28 days of the treatment. Moreover, dexamethasone reduced the accumulation of collagen (p<0.01 after 14 days and p<0.001 after 28 days) and the formation of smooth muscle mass (p<0.01 for bronchioles and p>0.05 for vessels after 24 days, p<0.001 for both bronchioles and vessels after 28 days). In conclusion, early dexamethasone treatment mitigated silica-induced granulocytic-lymphocytic inflammation and decreased a formation of collagen and smooth muscle mass in the bronchiolar and vascular walls, demonstrating a therapeutic potential of dexamethasone in the lung silicosis.
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Yin H, Xie Y, Gu P, Li W, Zhang Y, Yao Y, Chen W, Ma J. The emerging role of epigenetic regulation in the progression of silicosis. Clin Epigenetics 2022; 14:169. [PMID: 36494831 PMCID: PMC9737765 DOI: 10.1186/s13148-022-01391-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 11/30/2022] [Indexed: 12/13/2022] Open
Abstract
Silicosis is one of the most severe occupational diseases worldwide and is characterized by silicon nodules and diffuse pulmonary fibrosis. However, specific treatments for silicosis are still lacking at present. Therefore, elucidating the pathogenesis of silicosis plays a significant guiding role for its treatment and prevention. The occurrence and development of silicosis are accompanied by many regulatory mechanisms, including epigenetic regulation. The main epigenetic regulatory mechanisms of silicosis include DNA methylation, non-coding RNA (ncRNA), and histone modifications. In recent years, the expression and regulation of genes related to silicosis have been explored at epigenetic level to reveal its pathogenesis further, and the identification of aberrant epigenetic markers provides new biomarkers for prediction and diagnosis of silicosis. Here, we summarize the studies on the role of epigenetic changes in the pathogenesis of silicosis to give some clues for finding specific therapeutic targets for silicosis.
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Affiliation(s)
- Haoyu Yin
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Yujia Xie
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Pei Gu
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Wei Li
- grid.417303.20000 0000 9927 0537Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou, 221004 Jiangsu China
| | - Yingdie Zhang
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Yuxin Yao
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Weihong Chen
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
| | - Jixuan Ma
- grid.33199.310000 0004 0368 7223Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China ,grid.33199.310000 0004 0368 7223Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 Hubei China
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Ganesan N, Ronsmans S, Hoet P. Differential immunological effects of silica nanoparticles on peripheral blood mononuclear cells of silicosis patients and controls. Front Immunol 2022; 13:1025028. [PMID: 36311760 PMCID: PMC9606771 DOI: 10.3389/fimmu.2022.1025028] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 09/21/2022] [Indexed: 11/29/2022] Open
Abstract
Silicosis is a fibrotic disease caused by the inhalation of respirable silica particles, which are typically engulfed by alveolar macrophages and subsequently induce the release of inflammatory cytokines. Various animal experimental and human studies have focused on modeling silicosis, to assess the interactions of macrophages and other cell types with silica particles. There is still, however, limited knowledge on the differential response upon silica-exposure between silicosis patients and controls. We focused on studying the responsiveness of peripheral blood mononuclear cells (PBMCs) to silica nanoparticles (SiNPs) - Ludox and NM-200 - of silicosis patients and controls. The proliferative capacity of T- CD3+ and B- CD19+ cells, were evaluated via Carboxyfluorescein succinimidyl ester (CFSE) assay. The activation status of lymphocyte subsets and response to silica were also evaluated by comparing the extent of micro-granuloma or aggregate formation with the cytokine secretion profiles between both groups of individuals. The proliferative capacity of CD19+ cells was elevated in silicotic patients as opposed to controls. Subsets of regulatory T cells (CD4+ CD25+ and CD8+ CD25+) and immunoglobulins IgM and IgG were also significantly increased in patients. The number and the size of aggregates formed were higher with SiNPs stimulation in patients compared to controls. Multivariable analysis also elucidated the role of key cytokines like interleukin-1β (IL-1β), IL-6 and interferon-gamma (IFN-γ), which were upregulated in SiNP-stimulated PBMCs of patients compared to controls. Our ex vivo model thus has potential to provide insights into the immunological effects of silica particles in lymphocytes of silicosis patients and controls.
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Affiliation(s)
- Nirosha Ganesan
- Laboratory of Toxicology, Unit of Environment & Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium
| | - Steven Ronsmans
- Laboratory of Toxicology, Unit of Environment & Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
- Clinic for Occupational and Environmental Medicine, Department of Respiratory Diseases, University Hospitals Leuven, Leuven, Belgium
| | - Peter Hoet
- Laboratory of Toxicology, Unit of Environment & Health, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), KU Leuven, Leuven, Belgium
- *Correspondence: Peter Hoet,
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24
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Gao J, Li C, Wang X, Sun X, Zhang R, chen C, Yu M, Liu Y, Zhu Y, Chen J. Oridonin attenuates lung inflammation and fibrosis in silicosis via covalent targeting iNOS. Biomed Pharmacother 2022; 153:113532. [DOI: 10.1016/j.biopha.2022.113532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 08/05/2022] [Accepted: 08/08/2022] [Indexed: 01/18/2023] Open
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Liu JY, Sayes CM. A toxicological profile of silica nanoparticles. Toxicol Res (Camb) 2022; 11:565-582. [PMID: 36051665 PMCID: PMC9424711 DOI: 10.1093/toxres/tfac038] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 05/16/2022] [Accepted: 05/29/2022] [Indexed: 08/02/2023] Open
Abstract
Humans are regularly exposed to silica nanoparticles in environmental and occupational contexts, and these exposures have been implicated in the onset of adverse health effects. Existing reviews on silica nanoparticle toxicity are few and not comprehensive. There are natural and synthetic sources by which crystalline and amorphous silica nanoparticles are produced. These processes influence physiochemical properties, which are factors that can dictate toxicological effects. Toxicological assessment includes exposure scenario (e.g. environmental, occupational), route of exposure, toxicokinetics, and toxicodynamics. Broader considerations include pathology, risk assessment, regulation, and treatment after injury. This review aims to consolidate the most relevant and up-to-date research in these areas to provide an exhaustive toxicological profile of silica nanoparticles.
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Affiliation(s)
- James Y Liu
- Department of Environmental Science, Baylor University, One Bear Place # 97266, Waco, TX 76798-7266, United States
| | - Christie M Sayes
- Corresponding author: Department of Environmental Science, Baylor University, One Bear Place # 97266, Waco, TX 76798-7266, United States.
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Kumari S, Singh R. Protective effects of intranasal curcumin on silica-induced lung damage. Cytokine 2022; 157:155949. [PMID: 35764024 DOI: 10.1016/j.cyto.2022.155949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 06/09/2022] [Accepted: 06/18/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVE Being anti-inflammatory and an antioxidant in nature, curcumin has been studied for its anti-asthmatic effects, but its impact on silicosis has not been investigated before. It is a form of occupational lung illness caused by inhaling crystalline silica. It is particularly common among those who work in construction-related sectors. Therefore, present study has been undertaken to investigate impact of intranasal curcumin on silica induced lung damage in mice model of silicosis. MATERIALS AND METHODS Mice model of silicosis was developed by intranasal silica instillation (2.5 mg/mice) for different durations mainly 7, 14 and 21 days, where the longest duration of silica exposure (21 days) mimics chronic occupational exposure of silica dust leading to silicosis. Curcumin (5 mg/kg,i.n) and /or dexamethasone, a known corticosteroid (10 mg/kg,i.p) was administered an hour prior to silica administration. RESULTS Present study revealed silica induced lung damage in the mice model of silicosis characterized by airway inflammation, collagen deposition and enhanced expression of fibrosis markers (MMP-9, α-SMA, Hydroxyproline), which were significantly reduced in curcumin treatment groups. Inhibitory effects of curcumin were compared with standard drug, dexamethasone, a corticosteroid and was found better in protecting structural alterations in the lung. Damaged and abnormal mitochondria (enlarged and irregular shapes) were observed in silicosis group which were reduced in curcumin and dexamethasone treatment groups as revealed in transmission electron microscopic studies. CONCLUSIONS Present study shows protective effects of intranasal curcumin on silica-induced airway inflammation and structural changes thereby lung damage. Hence, it can be considered as an alternative and complementary medication for silicosis.
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Affiliation(s)
- Sneha Kumari
- Department of Zoology, MMV Unit, Banaras Hindu University, Varanasi 221005, India
| | - Rashmi Singh
- Department of Zoology, MMV Unit, Banaras Hindu University, Varanasi 221005, India.
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Three's Company: Coexistence of Silicosis, Scleroderma, and Sjogren Syndrome in a Single Patient. Case Rep Rheumatol 2022; 2022:4487638. [PMID: 35669457 PMCID: PMC9167016 DOI: 10.1155/2022/4487638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 11/21/2022] Open
Abstract
We describe a patient who presented with silicosis, scleroderma, and Sjogren syndrome all at the same time. The diagnoses in this case are all associated with continuous exposure to crystalline silica at the patient's workplace. The following report discusses this unique presentation.
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28
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Liu TC, Tang HH, Lei SY, Peng YI. Asian dust storms result in a higher risk of the silicosis hospital admissions. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2022; 20:305-314. [PMID: 35669799 PMCID: PMC9163224 DOI: 10.1007/s40201-021-00777-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 12/25/2021] [Indexed: 06/15/2023]
Abstract
PURPOSE Previous studies found that silicosis was majorly associated with occupation-related risks. However, little evidence was available to clarify the relation between Asian dust storm (ADS) and silicosis hospital admissions. This present paper aims to investigate the association between ADS events and hospital admissions for silicosis. METHODS We applied a Poisson time-series regression on the 2000-2012 National Health Insurance Research Database in Taiwan, linking air quality data and ambient temperature data to estimate the impact of ADS on silicosis hospital admissions in the age-specific groups. RESULTS A total of 2154 hospital admissions were recorded for silicosis in Taiwan, for a daily average number of 0.45. The number rises from 0.43 on a day without ADS to 0.70 on the outbreak day and continues increasing to 0.83 one day after outbreak. Among patients under 45, the effect of ADS appears on the event day as well as several post-event days (lag2-6) at the significant level of p < 0.1. There is also a significant lag effect on post-event day 2 (p < 0.05) for those aged above 74. CONCLUSION Asian dust storms do result in a rise of silicosis hospital admissions, particularly for those above 74, those under 45, and for females.
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Affiliation(s)
- Tsai-Ching Liu
- Department of Public Finance, National Taipei University, 151, University Rd., San Shia, New Taipei City, Taiwan 237
| | - Hui-Hsuan Tang
- Department of Economics, National Taipei University, 151, University Rd., San Shia, New Taipei City, Taiwan 237
| | - Shu-Yi Lei
- Department of Statistics, National Taipei University, 151, University Rd., San Shia, New Taipei City, Taiwan 237
| | - Yu-I Peng
- Department of Public Finance, National Taipei University, 151, University Rd., San Shia, New Taipei City, Taiwan 237
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29
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Du X, Rodriguez J, Wee J. Dietary Postbiotics Reduce Cytotoxicity and Inflammation Induced by Crystalline Silica in an In Vitro RAW 264.7 Macrophage Model. Foods 2022; 11:foods11060877. [PMID: 35327299 PMCID: PMC8955347 DOI: 10.3390/foods11060877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 11/21/2022] Open
Abstract
Crystalline silica (cSiO2) particles are naturally existing environmental toxicants. Exposure to cSiO2 could cause local or systemic inflammation and aggregate inflammation-associated diseases. Dietary postbiotics are reported to possess anti-inflammatory activities; however, their effects on cSiO2-triggered inflammation are unknown. Here, we investigate the impact of postbiotics from Lacticaseibacillus rhamnosus (LGG), Limosilactobacillus reuteri (L.reu), and Bifidobacterium animalis subsp. lactis Bb12 (BB12) on cSiO2-induced cytotoxicity and IL-1 cytokines in vitro using macrophages. The postbiotics used in this study were cell-free fractions of a probiotic growth medium collected at different time points. The in vitro model used was the wild-type murine macrophage RAW 264.7 cell line stably transfected with the inflammasome adapter protein, ASC. Our results indicate that all the postbiotics could reduce cSiO2-induced cytotoxicity in the wild-type and ASC macrophages and the effects were OD-dependent. Following priming with a lipopolysaccharide, cSiO2 treatment resulted in robust inflammasome activation in ASC, as reflected by the IL-1β release. These responses were minimal or absent in the wild-type RAW cells. All the postbiotics decreased the release of IL-1β from ASC; however, only LGG and BB12 reduced the IL-1β secretion from wild-type cells. Only the L.reu postbiotics reduced the IL-1α release from ASC. We conclude that the postbiotics from LGG, BB12, and L.reu can protect macrophages against cSiO2-induced cytotoxicity and suppress IL-1β activation.
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30
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Xuan W, Zheng L, Bunes BR, Crane N, Zhou F, Zang L. Engineering solutions to breath tests based on an e-nose system for silicosis screening and early detection in miners. J Breath Res 2022; 16. [PMID: 35303733 DOI: 10.1088/1752-7163/ac5f13] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 03/18/2022] [Indexed: 11/11/2022]
Abstract
OBJECTIVES This study aims to develop an engineering solution to breath tests using an electronic nose (e-nose), and evaluate its diagnosis accuracy for silicosis. Influencing factors of this technique were explored. METHODS 398 non-silicosis miners and 221 silicosis miners were enrolled in this cross-sectional study. Exhaled breath was analyzed by an array of 16 organic nanofiber sensors along with a customized sample processing system. Principal Component Analysis was used to visualize the breath data, and classifiers were trained by two improved cost-sensitive ensemble algorithms (RF and XGBoost) and two classical algorithms (KNN and SVM). All subjects were included to train the screening model, and an early detection model was run with silicosis cases in stage I. Both 5-fold cross-validation and external validation were adopted. Difference in classifiers caused by algorithms and subjects was quantified using a two-factor analysis of variance. The association between personal smoking habits and classification was investigated by the chi-square test. RESULTS Classifiers of ensemble learning performed well in both screening and early detection model, with an accuracy range of 0.817 to 0.987. Classical classifiers showed relatively worse performance. Besides, the ensemble algorithm type and silicosis cases inclusion had no significant effect on classification (p>0.05). There was no connection between personal smoking habits and classification accuracy. CONCLUSION Breath tests based on an e-nose consisted of 16x sensor array performed well in silicosis screening and early detection. Raw data input showed a more significant effect on classification compared with the algorithm. Personal smoking habits had little impact on models, supporting the applicability of models in large-scale silicosis screening. The e-nose technique and the breath analysis methods reported are expected to provide a quick and accurate screening for silicosis, and extensible for other diseases.
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Affiliation(s)
- Wufan Xuan
- China University of Mining and Technology, School of Safety Engineering, Xuzhou, 221116, CHINA
| | - Lina Zheng
- China University of Mining and Technology, School of Safety Engineering, Xuzhou, 221116, CHINA
| | - Benjamin R Bunes
- Vaporsens, Inc, 419 Wakara Way, Salt Lake City, Utah, 84108, UNITED STATES
| | - Nichole Crane
- Vaporsens, Inc, 419 Wakara Way, Salt Lake City, Utah, UT 84108, UNITED STATES
| | - Fubao Zhou
- China University of Mining and Technology, School of Safety Engineering, Xuzhou, 221116, CHINA
| | - Ling Zang
- Nano Institute of Utah, 36 South Wasatch Drive, Salt Lake City, Utah, 84112-8924, UNITED STATES
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31
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Williams H, Ehrlich R, Barker S, Kisting-Cairncross S, Zungu M, Yassi A. The Utility of Length of Mining Service and Latency in Predicting Silicosis among Claimants to a Compensation Trust. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19063562. [PMID: 35329249 PMCID: PMC8953429 DOI: 10.3390/ijerph19063562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 02/01/2023]
Abstract
In the wake of a large burden of silicosis and tuberculosis among ex-miners from the South African gold mining industry, several programmes have been engaged in examining and compensating those at risk of these diseases. Availability of a database from one such programme, the Q(h)ubeka Trust, provided an opportunity to examine the accuracy of length of service in predicting compensable silicosis, and the concordance between self-reported employment and that officially recorded. Compensable silicosis was determined by expert panels, with ILO profusion ≥1/0 as the threshold for compensability. Age, officially recorded and self-reported years of service, and years since first and last service of 3146 claimants for compensable silicosis were analysed. Self-reported and recorded service were moderately correlated (R = 0.66, 95% confidence interval 0.64−0.68), with a Bland−Altman plot showing no systematic bias. There was reasonably high agreement with 75% of the differences being less than two years. Logistic regression and receiver operating characteristic curve analysis were used to test prediction of compensable silicosis. There was little predictive difference between length of service on its own and a model adjusting for length of service, age, and years since last exposure. Predictive accuracy was moderate, with significant potential misclassification. Twenty percent of claimants with compensable silicosis had a length of service <10 years; in almost all these claims, the interval between last exposure and the claim was 10 years or more. In conclusion, self-reported service length in the absence of an official service record could be accepted in claims with compatible clinical findings. Length of service offers, at best, moderate predictive capability for silicosis. Relatively short service compensable silicosis, when combined with at least 10 years since last exposure, was not uncommon.
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Affiliation(s)
- Haidee Williams
- Division of Occupational Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town 7925, South Africa; (R.E.); (S.K.-C.)
- Correspondence:
| | - Rodney Ehrlich
- Division of Occupational Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town 7925, South Africa; (R.E.); (S.K.-C.)
| | - Stephen Barker
- School of Population and Public Health, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; (S.B.); (A.Y.)
| | - Sophia Kisting-Cairncross
- Division of Occupational Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town 7925, South Africa; (R.E.); (S.K.-C.)
| | - Muzimkhulu Zungu
- School of Health Systems and Public Health, University of Pretoria, Pretoria 0002, South Africa;
- National Institute for Occupational Health, Division of the National Health Laboratory Service, Johannesburg 2000, South Africa
| | - Annalee Yassi
- School of Population and Public Health, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; (S.B.); (A.Y.)
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Xu H, Jia Y, Sun Z, Su J, Liu QS, Zhou Q, Jiang G. Environmental pollution, a hidden culprit for health issues. ECO-ENVIRONMENT & HEALTH (ONLINE) 2022; 1:31-45. [PMID: 38078200 PMCID: PMC10702928 DOI: 10.1016/j.eehl.2022.04.003] [Citation(s) in RCA: 63] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/26/2022] [Accepted: 04/23/2022] [Indexed: 12/12/2023]
Abstract
The environmental and health impacts from the massive discharge of chemicals and subsequent pollution have been gaining increasing public concern. The unintended exposure to different pollutants, such as heavy metals, air pollutants and organic chemicals, may cause diverse deleterious effects on human bodies, resulting in the incidence and progression of different diseases. The article reviewed the outbreak of environmental pollution-related public health emergencies, the epidemiological evidence on certain pollution-correlated health effects, and the pathological studies on specific pollutant exposure. By recalling the notable historical life-threatening disasters incurred by local chemical pollution, the damning evidence was presented to criminate certain pollutants as the main culprit for the given health issues. The epidemiological data on the prevalence of some common diseases revealed a variety of environmental pollutants to blame, such as endocrine-disrupting chemicals (EDCs), fine particulate matters (PMs) and heavy metals. The retrospection of toxicological studies provided illustrative clues for evaluating ambient pollutant-induced health risks. Overall, environmental pollution, as the hidden culprit, should answer for the increasing public health burden, and more efforts are highly encouraged to strive to explore the cause-and-effect relationships through extensive epidemiological and pathological studies.
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Affiliation(s)
- Hanqing Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, and Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China
| | - Yang Jia
- National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, and Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China
| | - Zhendong Sun
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China
| | - Jiahui Su
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qian S. Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Qunfang Zhou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China
- Institute of Environment and Health, Jianghan University, Wuhan, 430056, China
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China
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Allan-Blitz LT, Goldfine C, Erickson TB. Environmental and health risks posed to children by artisanal gold mining: A systematic review. SAGE Open Med 2022; 10:20503121221076934. [PMID: 35173966 PMCID: PMC8841918 DOI: 10.1177/20503121221076934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 01/11/2022] [Indexed: 11/16/2022] Open
Abstract
There are an estimated 5 million children working in artisanal and small-scale gold mines worldwide; however, the hazards are poorly characterized and often underreported. We systematically reviewed the literature on reports of hazards among children as a consequence of such activities through PubMed database using pre-defined search terms. We identified 113 articles published between 1984 and 2021 from 31 countries. Toxicological hazards were reported in 91 articles, including mercury, lead, and arsenic. Infectious hazards, noted in 18 articles, included malaria, cholera, and hepatitis. Six articles reported occupational hazards, including malnutrition, heat stroke, and reactive airway disease. Three articles reported traumatic hazards, including cave-ins, burns, animal attacks, falls, and weapon-inflected wounds. Those findings likely indicate a profound underreporting of the prevalence and consequences of such hazards among children. More work is needed both to characterize the burdens of those hazards and to address the underlying drivers of child labor in those settings.
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Affiliation(s)
- Lao-Tzu Allan-Blitz
- Department of Pediatrics, Boston Children’s Hospital, Boston, MA, USA
- Brigham and Women’s Hospital, Boston, MA, USA
| | - Charlotte Goldfine
- Brigham and Women’s Hospital, Boston, MA, USA
- Department of Emergency Medicine, Harvard Medical School, Boston, MA, USA
- Division of Medical Toxicology, Department of Emergency Medicine, Mass General Brigham, Boston, MA, USA
| | - Timothy B Erickson
- Brigham and Women’s Hospital, Boston, MA, USA
- Department of Emergency Medicine, Harvard Medical School, Boston, MA, USA
- Division of Medical Toxicology, Department of Emergency Medicine, Mass General Brigham, Boston, MA, USA
- Harvard Humanitarian Institute, Cambridge, MA, USA
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Niu Y, Yang S, Hu X. Activation of canonical inflammasome complex by acute silica exposure in experimental rat model. Toxicol Res (Camb) 2022; 11:162-168. [PMID: 35237420 PMCID: PMC8882782 DOI: 10.1093/toxres/tfab127] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 11/18/2021] [Accepted: 12/11/2021] [Indexed: 01/11/2023] Open
Abstract
Silicosis is a chronic irreversible pulmonary disease caused by the inhalation of silica crystals in occupational settings in most cases. Persistent inflammation in the alveolar space is considered to be the major reason for tissue damage and lung fibrogenesis. The mechanisms by which silica exposure activates immune cells are not well understood. Here, we employed an in vivo silicosis disease model by intratracheal instillation of a large dose of silica suspension in rats and explored the involvement of inflammasome activation. Marked leukocyte infiltration and edema were observed 3 days following silica exposure in treated animals compared to controls. Using this model, we compared the expression of inflammasome sensors (AIM2 and NLRP3) and effector protein (caspase-1) by western blot and immunohistochemical staining using the lung homogenates and lung tissue sections. Our results demonstrated that following acute silica exposure, AIM2, NLRP3 and caspase-1 expressions were increased in macrophages or/and lung epithelial cells compared to control animals. We also analyzed interleukin 1β expression using lung homogenates, and significant increase in interleukin 1β was observed in 3-day silica-exposed rats. The activation of inflammasome sensors AIM2 and NLRP3 suggested to us that blocking these activators may attenuate silica-associated tissue damage and inflammation.
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Affiliation(s)
- Yingmei Niu
- Correspondence address. Occupational Disease and Toxicology Department, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China. E-mail:
| | - Shuangli Yang
- Occupational Disease and Toxicology Department, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China
| | - Xiumei Hu
- Department of Pathology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, China
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35
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What is a Therapeutic Potential of N-Acetylcysteine in Lung Silicosis? ACTA MEDICA MARTINIANA 2021. [DOI: 10.2478/acm-2021-0011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Lung silicosis is a serious pulmonary disease caused by an exposure of lung to inhaled silicon dioxide (SiO2) or silica. Although pathomechanisms of the disease have not been fully elucidated, oxidative stress has been recognized as a fundamental factor triggering a fibrotizing inflammation leading to irreversible changes in lung tissue. Based on this knowledge, therapeutic potential of various antioxidants has been intensively discussed. Among them, N-acetylcysteine with its multiple anti-inflammatory and antioxidant actions and a long-term experience with its clinical use in various diseases appears as a very promising choice. The purpose of this article is to review the therapeutic effects of N-acetylcysteine particularly in relation to a lung injury and to point out a potential of N-acetylcysteine in the treatment of lung silicosis.
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He R, Yuan X, Lv X, Liu Q, Tao L, Meng J. Caveolin-1 negatively regulates inflammation and fibrosis in silicosis. J Cell Mol Med 2021; 26:99-107. [PMID: 34889029 PMCID: PMC8742238 DOI: 10.1111/jcmm.17045] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 09/30/2021] [Accepted: 10/24/2021] [Indexed: 11/28/2022] Open
Abstract
Inhalation of crystalline silica causes silicosis, the most common and serious occupational disease, which is characterized by progressive lung inflammation and fibrosis. Recent studies revealed the anti-inflammatory and anti-fibrosis role of Caveolin-1 (Cav-1) in lung, but this role in silicosis has not been investigated. Thus, this study evaluated Cav-1 regulatory effects in silicosis. It was found that Cav-1 levels were significantly reduced in the lung from silicosis patients and silicotic mice. The silicosis models were established in C57BL/6 (wild-type) and Cav-1 deficiency (Cav-1-/- ) mice, and Cav-1-/- mice displayed wider alveolar septa, increased collagen deposition and more silicotic nodules. The mice peritoneal-derived macrophages were used to explore the role of Cav-1 in silica-induced inflammation, which plays a central role in mechanism of silicosis. Cav-1 inhibited silica-induced infiltration of inflammatory cells and secretion of inflammatory factors in vitro and in vivo, partly by downregulating NF-κB pathway. Additionally, silica uptake and expression of 4-hydroxynonenal in silicotic mice were observed, and it was found that Cav-1 absence triggered excessive silica deposition, causing a stronger oxidative stress response. These findings demonstrate the protective effects of Cav-1 in silica-induced lung injury, suggesting its potential therapeutic value in silicosis.
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Affiliation(s)
- RongLing He
- Department of Pulmonary and Critical Care Medicine, Third Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Organ Fibrosis, Central South University, Changsha, China
| | - XiangNing Yuan
- Department of Pulmonary and Critical Care Medicine, Third Xiangya Hospital, Central South University, Changsha, China.,Department of Nephrology, Xiangya Hospital, Central South University, Changsha, China
| | - Xin Lv
- Department of Pulmonary and Critical Care Medicine, Third Xiangya Hospital, Central South University, Changsha, China.,Department of Nephrology, Xiangya Hospital, Central South University, Changsha, China
| | - QingXiang Liu
- Department of Pulmonary and Critical Care Medicine, Third Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Organ Fibrosis, Central South University, Changsha, China
| | - LiJian Tao
- Hunan Key Laboratory of Organ Fibrosis, Central South University, Changsha, China.,Department of Nephrology, Xiangya Hospital, Central South University, Changsha, China
| | - Jie Meng
- Department of Pulmonary and Critical Care Medicine, Third Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Organ Fibrosis, Central South University, Changsha, China
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37
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Wang H, Zhou S, Liu Y, Yu Y, Xu S, Peng L, Ni C. Exploration study on serum metabolic profiles of Chinese male patients with artificial stone silicosis, silicosis, and coal worker's pneumoconiosis. Toxicol Lett 2021; 356:132-142. [PMID: 34861340 DOI: 10.1016/j.toxlet.2021.11.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/31/2021] [Accepted: 11/22/2021] [Indexed: 01/04/2023]
Abstract
Long-term exposure to inhaled silica dust induces pneumoconiosis, which remains a heavy burden in developing countries. Modern industry provides new resources of occupational SiO2 leading to artificial stone silicosis especially in developed countries. This study aimed to characterize the serum metabolic profile of pneumoconiosis and artificial stone silicosis patients. Our case-control study recruited 46 pairs of pneumoconiosis patients and dust-exposed workers. Nontargeted metabolomics and lipidomics by ultra-high-performance liquid chromatography-tandem mass spectrometry platform were conducted to characterize serum metabolic profile in propensity score-matched (PSM) pilot study. 54 differential metabolites were screened, 24 of which showed good screening efficiency through receiver operating characteristics (ROC) in pilot study and validation study (both AUC > 0.75). 4 of the 24 metabolites can predict pneumoconiosis stages, which are 1,2-dioctanoylthiophosphatidylcholine, phosphatidylcholine(O-18:1/20:1), indole-3-acetamide and l-homoarginine. Kynurenine, N-tetradecanoylsphingosine 1-phosphate, 5-methoxytryptophol and phosphatidylethanolamine(22:6/18:1) displayed the potential as specific biomarkers for artificial stone silicosis. Taken together, our results confirmed that tryptophan metabolism is closely related to pneumoconiosis and may be related to disease progression. Hopefully, our results could supplement the biomarkers of pneumoconiosis and provide evidence for the discovery of artificial stone silicosis-specific biomarkers.
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Affiliation(s)
- Huanqiang Wang
- National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, 100000, PR China
| | - Siyun Zhou
- Department of Occupational Medical and Environmental Health, Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, PR China
| | - Yi Liu
- Gusu School, Nanjing Medical University, Nanjing, 211166, PR China
| | - Yihan Yu
- Hubei Provincial Hospital of Integrated Chinese & Western Medicine, Wuhan, 430000, PR China
| | - Sha Xu
- Hubei Provincial Hospital of Integrated Chinese & Western Medicine, Wuhan, 430000, PR China
| | - Lan Peng
- Department of Occupational Medical and Environmental Health, Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, PR China
| | - Chunhui Ni
- Department of Occupational Medical and Environmental Health, Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, PR China.
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38
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Huaux F. Interpreting Immunoregulation in Lung Fibrosis: A New Branch of the Immune Model. Front Immunol 2021; 12:690375. [PMID: 34489937 PMCID: PMC8417606 DOI: 10.3389/fimmu.2021.690375] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 07/06/2021] [Indexed: 12/24/2022] Open
Abstract
Immunostimulation is recognized as an important contribution in lung fibrosis in some animal models and patient subsets. With this review, we illustrate an additional scenario covering the possible implication of immunoregulation during fibrogenesis. Available animal and human data indicate that pulmonary fibrosis also includes diverse and discrete immunoregulating populations comprising regulatory lymphocytes (T and B regs) and myeloid cells (immunosuppressive macrophages and myeloid-derived suppressive cells; MDSC). They are initially recruited to limit the establishment of deleterious inflammation but participate in the development of lung fibrosis by producing immunoregulatory mediators (mainly TGF-β1 and IL-10) that directly or indirectly stimulate fibroblasts and matrix protein deposition. The existence of this silent immunoregulatory environment sustains an alternative mechanism of fibrosis that explains why in some conditions neither pro-inflammatory cytokine deficiency nor steroid and immunosuppressive therapies limit lung fibrosis. Therefore, the persistent presence of immunoregulation is an important parameter to consider for refining therapeutical strategies in lung fibrotic disorders under non-immunostimulatory conditions.
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Affiliation(s)
- François Huaux
- Louvain Centre for Toxicology and Applied Pharmacology (LTAP), Institut de Recherche Experimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
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39
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Early Detection Methods for Silicosis in Australia and Internationally: A Review of the Literature. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18158123. [PMID: 34360414 PMCID: PMC8345652 DOI: 10.3390/ijerph18158123] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 12/30/2022]
Abstract
Pneumoconiosis, or occupational lung disease, is one of the world’s most prevalent work-related diseases. Silicosis, a type of pneumoconiosis, is caused by inhaling respirable crystalline silica (RCS) dust. Although silicosis can be fatal, it is completely preventable. Hundreds of thousands of workers globally are at risk of being exposed to RCS at the workplace from various activities in many industries. Currently, in Australia and internationally, there are a range of methods used for the respiratory surveillance of workers exposed to RCS. These methods include health and exposure questionnaires, spirometry, chest X-rays, and HRCT. However, these methods predominantly do not detect the disease until it has significantly progressed. For this reason, there is a growing body of research investigating early detection methods for silicosis, particularly biomarkers. This literature review summarises the research to date on early detection methods for silicosis and makes recommendations for future work in this area. Findings from this review conclude that there is a critical need for an early detection method for silicosis, however, further laboratory- and field-based research is required.
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40
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Peruzzi CP, Brucker N, Bubols G, Cestonaro L, Moreira R, Domingues D, Arbo M, Olivo Neto P, Knorst MM, Garcia SC. Occupational exposure to crystalline silica and peripheral biomarkers: An update. J Appl Toxicol 2021; 42:87-102. [PMID: 34128557 DOI: 10.1002/jat.4212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/24/2021] [Accepted: 04/25/2021] [Indexed: 12/20/2022]
Abstract
Peripheral biomarkers are important tools for detecting occupational exposures to prevent the onset and/or progression of diseases. Studies that reveal early peripheral biomarkers are highly important to preserve the health of workers and can potentially contribute to diagnosing and/or prognosing occupational pathologies. Exposure to crystalline silica is a problem in several workplaces because it increases the risk of chronic obstructive pulmonary disease (COPD), tuberculosis, cancer, and pulmonary fibrosis, clinically defined as silicosis. Silicosis is diagnosed by chest radiography and/or lung tomography in advanced stages when there is a severe loss of lung function. Peripheral biomarkers can help in diagnosing early changes prior to silicosis and represent a highly important technical-scientific advance that is minimally invasive. This review aimed to investigate the biomarkers studied for evaluating occupational exposure to crystalline silica and to understand the recent advances in this area. Potential oxidative, inflammatory, and immunological biomarkers were reviewed, as well as routine biomarkers such as biochemical parameters. It was found that biomarkers of effect such as serum CC16 and l-selectin levels could represent promising alternatives. Additionally, studies have shown that neopterin levels in urine and serum can be used to monitor worker exposure. However, further studies are needed that include a greater number of participants, different times of exposure to crystalline silica, and a combination of silicosis patients and healthy volunteers. Evaluating the concentration of crystalline silica in occupational environments, its impact on biomarkers of effect, and alterations in lung function could contribute to revealing early health alterations in workers in a more robust manner.
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Affiliation(s)
- Caroline Portela Peruzzi
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Natália Brucker
- Graduate Program in Pharmacology, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Guilherme Bubols
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Larissa Cestonaro
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rafael Moreira
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Daiane Domingues
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Marcelo Arbo
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Pedro Olivo Neto
- Graduate Program in Pneumological Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Marli Maria Knorst
- Graduate Program in Pneumological Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Division of Pulmonology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Solange Cristina Garcia
- Laboratory of Toxicology (LATOX), Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Graduate Program in Pharmaceutical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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41
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[Silica causes difficulties]. Rev Mal Respir 2021; 38:768-772. [PMID: 34023191 DOI: 10.1016/j.rmr.2021.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 03/25/2021] [Indexed: 11/22/2022]
Abstract
Silicosis and sarcoidosis are two very distinct entities in the literature. All the additional non-invasive examinations, including the chest CT scan, often do not differentiate them. The history, including occupational exposure to identified silica particles, is a discriminating factor. However, due to the pathogenic power of silica, it would be possible to have the simultaneous development of these two pathologies in the same patient. To illustrate this situation, here is the case of a 62-year-old patient, who presented initially with a picture of dyspnea and productive cough. The chest CT showed micronodular peribronchovascular infiltrates and mediastinal lymphadenopathy. The other additional examinations did not find anything specific. In the diagnostic process, the patient had multiple endoscopic samples which did not make it possible to be conclusive on one or the other of these pathologies. He therefore underwent a surgical lung biopsy which revealed histological lesions compatible with the two pathologies. Recent studies suggest that inhaled particles, especially silica, could be responsible for the pattern of sarcoidosis. However, it is difficult to say whether, in this case, silica was responsible for the development of sarcoidosis.
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42
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Adamcakova J, Mokra D. New Insights into Pathomechanisms and Treatment Possibilities for Lung Silicosis. Int J Mol Sci 2021; 22:ijms22084162. [PMID: 33920534 PMCID: PMC8072896 DOI: 10.3390/ijms22084162] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/14/2021] [Accepted: 04/14/2021] [Indexed: 02/06/2023] Open
Abstract
Inhalation of silica particles is an environmental and occupational cause of silicosis, a type of pneumoconiosis. Development of the lung silicosis is a unique process in which the vicious cycle of ingestion of inhaled silica particles by alveolar macrophages and their release triggers inflammation, generation of nodular lesions, and irreversible fibrosis. The pathophysiology of silicosis is complex, and interactions between the pathomechanisms have not been completely understood. However, elucidation of silica-induced inflammation cascades and inflammation-fibrosis relations has uncovered several novel possibilities of therapeutic targeting. This article reviews new information on the pathophysiology of silicosis and points out several promising treatment approaches targeting silicosis-related pathways.
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43
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Nandi SS, Dhatrak SV, Sarkar K. Silicosis, progressive massive fibrosis and silico-tuberculosis among workers with occupational exposure to silica dusts in sandstone mines of Rajasthan state: An urgent need for initiating national silicosis control programme in India. J Family Med Prim Care 2021; 10:686-691. [PMID: 34041062 PMCID: PMC8138390 DOI: 10.4103/jfmpc.jfmpc_1972_20] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/02/2020] [Accepted: 12/21/2020] [Indexed: 11/21/2022] Open
Abstract
Context: Silicosis is a progressive, irreversible and incurable respiratory morbidity and often becomes a cause for pre-mature mortality among occupationally silica dust-exposed workers in India and similar countries. It has a dual problem of associated silico-tuberculosis as a co-morbidity. The present study was done to assess the respiratory morbidity caused by silicosis in sandstone mine of Rajasthan, India. Methods: The chest X-rays of 529 subjects having history of employment in stone mines with respiratory morbidity were subjected for this study and evaluated in accordance with ILO Classification 2000. The X-rays were classified into various categories of silicosis and progressive massive fibrosis (PMF) in relation to years of work in stone mines. Results: Out of 529 chest radiographs evaluated, 275 (52%) showed radiological evidence of silicosis. Of them, 40 (7.5%) subjects showed large opacities suggestive of progressive massive fibrosis. Both silicosis and progressive massive fibrosis were associated with increasing duration of work in stone mines. Sixty-one (12.4%) subjects with silicosis also had associated pulmonary tuberculosis, termed as silico-tuberculosis. Conclusion: The present study showed a high prevalence of silicosis, progressive massive fibrosis and silico-tuberculosis among stone mine workers. It appears that that unless silicosis is controlled, elimination of tuberculosis is far from reality in the country. Hence, states and central authorities must work together towards control of both silicosis as well as silico-tuberculosis. Similarly, there is an urgent need of initiation of national silicosis control programme, similar to existing national tuberculosis control programme, considering the huge burden of silicosis in India
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Affiliation(s)
- Subroto S Nandi
- Department of Environmental Monitoring and Exposure Assessment (Air), National Institute of Occupational Health, Ahmedabad, Gujarat, India
| | - Sarang V Dhatrak
- Department of Poison Information Centre, National Institute of Occupational Health, Ahmedabad, Gujarat, India
| | - Kamalesh Sarkar
- Director, National Institute of Occupational Health, Ahmedabad, Gujarat, India
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44
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Liu X, Lu B, Fu J, Zhu X, Song E, Song Y. Amorphous silica nanoparticles induce inflammation via activation of NLRP3 inflammasome and HMGB1/TLR4/MYD88/NF-kb signaling pathway in HUVEC cells. JOURNAL OF HAZARDOUS MATERIALS 2021; 404:124050. [PMID: 33053467 DOI: 10.1016/j.jhazmat.2020.124050] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 05/15/2023]
Abstract
Silica nanoparticles (SiO2 NPs) are extensively applied in various field, which increased their health risks to humans. SiO2 NPs were reported to enter into blood through inhalation and meanwhile, the potential use of SiO2 NPs as drug carriers in vivo allows them to present in blood circulation to induce inflammation of vascular endothelial cells which can be closely related with cardiovascular diseases, whilst the intrinsic mechanism has not been well understood. In this study, we found a regulation of signal axis induced by amorphous SiO2 NPs that triggers pro-inflammatory responses in human umbilical vein endothelial cells (HUVECs). HUVECs exposed with SiO2 NPs generate excess amount of reactive oxygen species (ROS) and lactate dehydrogenase (LDH), together with the up-regulation of cell inflammatory factors [interleukin-1 beta (IL-1β), interleukin-6 (IL-6), tumor necrotic factor-α (TNF-α)] and cell adhesion molecules [intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1)]. In addition, SiO2 NPs were found to promote the translocation and release of high-mobility group box 1 (HMGB1) from nucleus to cytoplasm, which was demonstrated to be regulated by ROS and NOD-like receptor pyrin domain containing 3 (NLRP3) inflammasome. Subsequently, toll-like receptor 4 (TLR4) could bind with HMGB1, up-regulate the expression of myeloid differentiation factor 88 (MyD88) and then activate nuclear factor kappa-B (NF-κB) signaling pathway, ultimately induced the inflammatory response of HUVECs. Overall, out results revealed the related signaling pathways of cell inflammation induced by amorphous SiO2 NPs, which provided new insights in understanding SiO2 NPs-induced cytotoxicity and offered safety guidance for further nanomaterial application.
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Affiliation(s)
- Xuting Liu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China
| | - Bin Lu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China
| | - Juanli Fu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China
| | - Xiaokang Zhu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China
| | - Erqun Song
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China
| | - Yang Song
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, People's Republic of China.
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45
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Rafieepour A, R Azari M, Pourahmad Jaktaji J, Khodagholi F, Peirovi H, Mehrabi Y, Mohammadian Y. The Effect of Particle Size on the Cytotoxicity of Amorphous Silicon Dioxide: An in Vitro Toxicological Study. Asian Pac J Cancer Prev 2021; 22:325-332. [PMID: 33639644 PMCID: PMC8190354 DOI: 10.31557/apjcp.2021.22.2.325] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Indexed: 11/25/2022] Open
Abstract
Introduction: Amorphous silicon dioxide (A-SiO2) is abundant in the Earth’s crust, the A-SiO2 nano and microparticles are released into the air through industrial and manufacturing activities. Due to the limited available toxicological information, the objective of the present study was to evaluate the toxicity of different sizes of A-SiO2 particles on the A549 cell-lines in an in vitro study. Materials and Methods: The A-SiO2 particles in two categories of nano (10-100 nm) and micro (< 5um) were used in this study. The human lung A549 cell-line was exposed to either nano- or micro-sized A-SiO2 particles at 10, 50, 100, and 250 μg/ml, and the effects were investigated. Results: The cytotoxicity of A-SiO2 nano and microparticles in both 24- and 72-hour exposure times resulted in decreased cell survival, mitochondrial membrane potential, and increased ROS generation which was concentration-time dependent (P <0.05) but glutathione content was not affected in a time-dependent manner. Cytotoxicity of nanoparticles, contrary to the previous study, was not higher than microparticles in the comparable dose and exposure times. Conclusion: The rate of ROS generation in the A549 cell-line exposed to A-SiO2 nanoparticles was higher than microparticles. And at the same time, cell survival for exposed cells to A-SiO2 nano and microparticles were higher for nanoparticles in shorter exposure periods and was inversely concentration- and time-dependent. Further studies on exploring the effect of size and its possible toxic mechanism are recommended to achieve a more credible risk assessment.
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Affiliation(s)
- Athena Rafieepour
- Student Research Committee, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mansour R Azari
- School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Fariba Khodagholi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Habibollah Peirovi
- Nanomedicine and Tissue Engineering Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Yadollah Mehrabi
- School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Yousef Mohammadian
- Department of Occupational Health Engineering, Tabriz University of Medical Sciences, Tabriz, Iran
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46
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Joseph P, Umbright CM, Roberts JR, Cumpston JL, Orandle MS, McKinney WG, Sager TM. Lung toxicity and gene expression changes in response to whole-body inhalation exposure to cellulose nanocrystal in rats. Inhal Toxicol 2021; 33:66-80. [PMID: 33602020 PMCID: PMC10442725 DOI: 10.1080/08958378.2021.1884320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/27/2021] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Human exposure to cellulose nanocrystal (CNC) is possible during the production and/or use of products containing CNC. The objectives of the current study were to determine the lung toxicity of CNC and the underlying molecular mechanisms of the toxicity. METHODS Rats were exposed to air or CNC (20 mg/m3, six hours/day, 14 d) by whole-body inhalation and lung toxicity and global gene expression profile were determined. RESULTS Significant increases in lactate dehydrogenase activity, pro-inflammatory cytokine levels, phagocyte oxidant production, and macrophage and neutrophil counts were detected in the bronchoalveolar lavage cells or fluid from the CNC exposed rats. Mild lung histological changes, such as the accumulation of macrophages and neutrophils, were detected in the CNC exposed rats. Gene expression profiling by next generation sequencing identified 531 genes whose expressions were significantly different in the lungs of the CNC exposed rats, compared with the controls. Bioinformatic analysis of the lung gene expression data identified significant enrichment in several biological functions and canonical pathways including those related to inflammation (cellular movement, immune cell trafficking, inflammatory diseases and response, respiratory disease, complement system, acute phase response, leukocyte extravasation signaling, granulocyte and agranulocyte adhesion and diapedesis, IL-10 signaling, and phagosome formation and maturation) and oxidative stress (NRF2-mediated oxidative stress response, production of nitric oxide and reactive oxygen species in macrophages, and free radical scavenging). CONCLUSION Our data demonstrated that inhalation exposure of rats to CNC resulted in lung toxicity mediated mainly through the induction of inflammation and oxidative stress.
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Affiliation(s)
- Pius Joseph
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Christina M Umbright
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Jenny R Roberts
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Jared L Cumpston
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Marlene S Orandle
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Walter G McKinney
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Tina M Sager
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
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47
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Karataş M, Büyükşekerci M, Gündüzöz M, Özakıncı G, Öziş TN, Gök G, Neşelioğlu S, Erel Ö. Alteration of thiol disulfide homeostasis and ischemia-modified albumin levels as indicators of oxidative status in patients with silicosis. Toxicol Ind Health 2020; 37:38-46. [PMID: 33305688 DOI: 10.1177/0748233720977987] [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: 11/16/2022]
Abstract
The aim of this study was to evaluate the oxidative status in patients with silicosis by detecting dynamic thiol disulfide homeostasis (TDH), ischemia-modified albumin level (IMA) catalase (CAT) activity, and the correlation of these markers with pulmonary function tests. Male ceramic workers with silicosis (n = 91) and healthy individuals (n = 47) were recruited for the study. Radiographic abnormalities of pneumoconiosis were classified into three profusion categories (categories 1, 2, and 3), and patients with silicosis, those with category 1, were defined as group 1 and those with category 2 or 3 were defined as group 2. Plasma levels of native thiol (NT), total thiol (TT), disulfide (Ds), IMA, and CAT activities were determined. Pulmonary function tests of groups were compared. NT, TT, and NT/TT ratios were significantly lower in groups 1 and 2 than the control group (p < 0.05). These did not differ between patients with silicosis (groups 1 and 2) and control group (p = 0.421). Ds/NT and Ds/TT ratios were significantly higher in group 2 than the control group (p < 0.05). NT, TT, and Ds did not differ significantly between groups 1 and 2. The oxidant biomarker IMA was higher (p < 0.001), and the antioxidant parameters albumin and CAT were lower in groups 1 and 2 (p < 0.001) compared with the control group. The mean FEV1act, FVCact, forced expiratory volume in 1 second/forced vital capacity (%), and value of 25-75 percent maximum expiratory flow were significantly lower in groups 1 and 2 than control group. We have used a novel colorimetric method to assess TDH in patients with silicosis. Alteration of plasma thiol/disulfide homeostasis and IMA levels might be novel indicators of oxidative stress in silicosis.
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Affiliation(s)
- Mevlüt Karataş
- Department of Chest Diseases, Occupational and Environmental Diseases Hospital, Ankara, Turkey
| | - Murat Büyükşekerci
- Department of Pharmacology, Occupational and Environmental Diseases Hospital, Ankara, Turkey
| | - Meşide Gündüzöz
- Department of Family Medicine, Occupational and Environmental Diseases Hospital, Ankara, Turkey
| | - Gökhan Özakıncı
- Department of Public Health, Occupational and Environmental Diseases Hospital, Ankara, Turkey
| | - Türkan Nadir Öziş
- Department of Chest Diseases, Occupational and Environmental Diseases Hospital, Ankara, Turkey.,Department of Biochemistry, 442146Yıldırım Beyazıt University, Ankara, Turkey
| | - Gamze Gök
- Department of Biochemistry, 442146Yıldırım Beyazıt University, Ankara, Turkey
| | - Salim Neşelioğlu
- Department of Biochemistry, 442146Yıldırım Beyazıt University, Ankara, Turkey
| | - Özcan Erel
- Department of Biochemistry, 442146Yıldırım Beyazıt University, Ankara, Turkey
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48
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Sager TM, Umbright CM, Mustafa GM, Yanamala N, Leonard HD, McKinney WG, Kashon ML, Joseph P. Tobacco Smoke Exposure Exacerbated Crystalline Silica-Induced Lung Toxicity in Rats. Toxicol Sci 2020; 178:375-390. [PMID: 32976597 PMCID: PMC7825013 DOI: 10.1093/toxsci/kfaa146] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Smoking may modify the lung response to silica exposure including cancer and silicosis. Nevertheless, the precise role of exposure to tobacco smoke (TS) on the lung response to crystalline silica (CS) exposure and the underlying mechanisms need further clarification. The objectives of the present study were to determine the role of TS on lung response to CS exposure and the underlying mechanism(s). Male Fischer 344 rats were exposed by inhalation to air, CS (15 mg/m3, 6 h/day, 5 days), TS (80 mg/m3, 3 h/day, twice weekly, 6 months), or CS (15 mg/m3, 6 h/day, 5 days) followed by TS (80 mg/m3, 3 h/day, twice weekly, 6 months). The rats were euthanized 6 months and 3 weeks following initiation of the first exposure and the lung response was assessed. Silica exposure resulted in significant lung toxicity as evidenced by lung histological changes, enhanced neutrophil infiltration, increased lactate dehydrogenase levels, enhanced oxidant production, and increased cytokine levels. The TS exposure alone had only a minimal effect on these toxicity parameters. However, the combined exposure to TS and CS exacerbated the lung response, compared with TS or CS exposure alone. Global gene expression changes in the lungs correlated with the lung toxicity severity. Bioinformatic analysis of the gene expression data demonstrated significant enrichment in functions, pathways, and networks relevant to the response to CS exposure which correlated with the lung toxicity detected. Collectively our data demonstrated an exacerbation of CS-induced lung toxicity by TS exposure and the molecular mechanisms underlying the exacerbated toxicity.
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Affiliation(s)
- Tina M Sager
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Christina M Umbright
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Gul Mehnaz Mustafa
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Naveena Yanamala
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Howard D Leonard
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Walter G McKinney
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Michael L Kashon
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
| | - Pius Joseph
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health (NIOSH), Morgantown, West Virginia 26505
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Li W, Xie L, Ma J, Cheng M, Fan L, Xu Y, Wang B, Chen W. Gas6 or Mer deficiency ameliorates silica-induced autophagosomes accumulation in mice lung. Toxicol Lett 2020; 337:28-37. [PMID: 33232774 DOI: 10.1016/j.toxlet.2020.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/14/2020] [Accepted: 11/16/2020] [Indexed: 12/14/2022]
Abstract
Published evidences have shown that autophagy plays an important role in silica-induced lung inflammation and collagen deposition. Our previous study found that the level of growth arrest-specific protein 6 (Gas6) in bronchoalveolar lavage fluid was increased after silica exposure. However, it is unclear whether Gas6 is involved in the regulation of silica-induced autophagy dysfunction. In this study, we observed an autophagosomes accumulation in wild-type C57BL/6 (WT) mice lung after silica intratracheal instillation and then investigated whether genetic loss of Gas6 (Gas6-/-) could ameliorate it. Our data showed that Gas6-/- mice exhibited a limited autophagosomes accumulation from days 7-84 after silica exposure, revealed by reduced induction and increased degradation of autophagosomes in mice lung tissue. Interestingly, silica particles could elevate the expression of Mer receptor, which was significantly decreased in Gas6-/- mice (P < 0.05). Furthermore, we found that Mer deficiency (Mer-/-) could also reduce the formation of autophagosomes and restore the function of impaired lysosomes in silica-treated mice. Taken together, our results indicate that genetic loss of Gas6 attenuates silica-induced autophagosomes accumulation partly through down-regulating the expression of Mer receptor. Targeting Gas6/Mer-mediated autophagy pathway may provide a novel insight into the prevention and therapy of silica-induced pulmonary fibrosis.
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Affiliation(s)
- Wei Li
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Li Xie
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Jixuan Ma
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Man Cheng
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Lieyang Fan
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Yiju Xu
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Bin Wang
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Weihong Chen
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China; Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China.
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Hoy RF, Chambers DC. Silica-related diseases in the modern world. Allergy 2020; 75:2805-2817. [PMID: 31989662 DOI: 10.1111/all.14202] [Citation(s) in RCA: 171] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/20/2019] [Accepted: 01/08/2020] [Indexed: 11/28/2022]
Abstract
Silicosis is an ancient and potentially fatal pneumoconiosis caused by exposure to respirable crystalline silica. Silicosis is historically a disease of miners; however, failure to recognize and control the risk associated with silica exposure in contemporary work practices such as sandblasting denim jeans and manufacturing of artificial stone benchtops has led to re-emergence of silicosis around the world. This review outlines the mineralogy, epidemiology, clinical and radiological features of the various forms of silicosis and other silica-associated diseases. Perspective is provided on the most recent studies shedding light on pathogenesis, including the central role of innate immune effector cells and subsequent inflammatory cascades in propagating pulmonary fibrosis and the extrapulmonary manifestations, which uniquely characterize this pneumoconiosis. Clinical conundrums in differential diagnosis, particularly between silicosis and sarcoidosis, are highlighted, as is the importance of obtaining a careful occupational history in the patient presenting with pulmonary infiltrates and/or fibrosis. While silicosis is a completely preventable disease, unfortunately workers around the world continue to be affected and experience progressive or even fatal disease. Although no treatments have been proven, opportunities to intervene to prevent progressive disease, founded in a thorough cellular and molecular understanding of the immunopathology of silicosis, are highlighted.
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Affiliation(s)
- Ryan F. Hoy
- Department of Epidemiology and Preventive Medicine School of Public Health and Preventive Medicine Monash University Melbourne VIC. Australia
- Department of Respiratory Medicine Alfred Hospital Melbourne VIC. Australia
| | - Daniel C. Chambers
- School of Clinical Medicine The University of Queensland Brisbane QLD Australia
- Queensland Lung Transplant Program The Prince Charles Hospital Brisbane QLD Australia
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