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Shahbaz MA, Kuivanen S, Mussalo L, Afonin AM, Kumari K, Behzadpour D, Kalapudas J, Koivisto AM, Penttilä E, Löppönen H, Jalava P, Vapalahti O, Balistreri G, Lampinen R, Kanninen KM. Exposure to urban particulate matter alters responses of olfactory mucosal cells to SARS-CoV-2 infection. Environ Res 2024; 249:118451. [PMID: 38341073 DOI: 10.1016/j.envres.2024.118451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/01/2024] [Accepted: 02/07/2024] [Indexed: 02/12/2024]
Abstract
Respiratory viruses have a significant impact on health, as highlighted by the COVID-19 pandemic. Exposure to air pollution can contribute to viral susceptibility and be associated with severe outcomes, as suggested by recent epidemiological studies. Furthermore, exposure to particulate matter (PM), an important constituent of air pollution, is linked to adverse effects on the brain, including cognitive decline and Alzheimer's disease (AD). The olfactory mucosa (OM), a tissue located at the rooftop of the nasal cavity, is directly exposed to inhaled air and in direct contact with the brain. Increasing evidence of OM dysfunction related to neuropathogenesis and viral infection demonstrates the importance of elucidating the interplay between viruses and air pollutants at the OM. This study examined the effects of subacute exposure to urban PM 0.2 and PM 10-2.5 on SARS-CoV-2 infection using primary human OM cells obtained from cognitively healthy individuals and individuals diagnosed with AD. OM cells were exposed to PM and subsequently infected with the SARS-CoV-2 virus in the presence of pollutants. SARS-CoV-2 entry receptors and replication, toxicological endpoints, cytokine release, oxidative stress markers, and amyloid beta levels were measured. Exposure to PM did not enhance the expression of viral entry receptors or cellular viral load in human OM cells. However, PM-exposed and SARS-CoV-2-infected cells showed alterations in cellular and immune responses when compared to cells infected only with the virus or pollutants. These changes are highly pronounced in AD OM cells. These results suggest that exposure of human OM cells to PM does not increase susceptibility to SARS-CoV-2 infection in vitro, but it can alter cellular immune responses to the virus, particularly in AD. Understanding the interplay of air pollutants and COVID-19 can provide important insight for the development of public health policies and interventions to reduce the negative influences of air pollution exposure.
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Affiliation(s)
- Muhammad Ali Shahbaz
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Suvi Kuivanen
- University of Helsinki, Department of Virology, Faculty of Medicine, Helsinki, Finland; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Virology, Berlin, Germany
| | - Laura Mussalo
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Alexey M Afonin
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Kajal Kumari
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Donya Behzadpour
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Juho Kalapudas
- University of Eastern Finland, Brain Research Unit, Department of Neurology, School of Medicine, Kuopio, Finland
| | - Anne M Koivisto
- University of Eastern Finland, Brain Research Unit, Department of Neurology, School of Medicine, Kuopio, Finland; Kuopio University Hospital, Department of Neurology, Neuro Centre, Kuopio, Finland; University of Helsinki, Faculty of Medicine, Department of Neurology and Geriatrics, Helsinki University Hospital and Neurosciences, Helsinki, Finland
| | - Elina Penttilä
- University of Eastern Finland and Kuopio University Hospital, Department of Otorhinolaryngology, Kuopio, Finland
| | - Heikki Löppönen
- University of Eastern Finland and Kuopio University Hospital, Department of Otorhinolaryngology, Kuopio, Finland
| | - Pasi Jalava
- University of Eastern Finland, Inhalation Toxicology Laboratory, Department of Environmental and Biological Sciences, Kuopio, Finland
| | - Olli Vapalahti
- University of Helsinki, Department of Virology, Faculty of Medicine, Helsinki, Finland
| | - Giuseppe Balistreri
- University of Helsinki, Department of Virology, Faculty of Medicine, Helsinki, Finland
| | - Riikka Lampinen
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | - Katja M Kanninen
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland.
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Mussalo L, Avesani S, Shahbaz MA, Závodná T, Saveleva L, Järvinen A, Lampinen R, Belaya I, Krejčík Z, Ivanova M, Hakkarainen H, Kalapudas J, Penttilä E, Löppönen H, Koivisto AM, Malm T, Topinka J, Giugno R, Aakko-Saksa P, Chew S, Rönkkö T, Jalava P, Kanninen KM. Emissions from modern engines induce distinct effects in human olfactory mucosa cells, depending on fuel and aftertreatment. Sci Total Environ 2023; 905:167038. [PMID: 37709087 DOI: 10.1016/j.scitotenv.2023.167038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/30/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
Ultrafine particles (UFP) with a diameter of ≤0.1 μm, are contributors to ambient air pollution and derived mainly from traffic emissions, yet their health effects remain poorly characterized. The olfactory mucosa (OM) is located at the rooftop of the nasal cavity and directly exposed to both the environment and the brain. Mounting evidence suggests that pollutant particles affect the brain through the olfactory tract, however, the exact cellular mechanisms of how the OM responds to air pollutants remain poorly known. Here we show that the responses of primary human OM cells are altered upon exposure to UFPs and that different fuels and engines elicit different adverse effects. We used UFPs collected from exhausts of a heavy-duty-engine run with renewable diesel (A0) and fossil diesel (A20), and from a modern diesel vehicle run with renewable diesel (Euro6) and compared their health effects on the OM cells by assessing cellular processes on the functional and transcriptomic levels. Quantification revealed all samples as UFPs with the majority of particles being ≤0.1 μm by an aerodynamic diameter. Exposure to A0 and A20 induced substantial alterations in processes associated with inflammatory response, xenobiotic metabolism, olfactory signaling, and epithelial integrity. Euro6 caused only negligible changes, demonstrating the efficacy of aftertreatment devices. Furthermore, when compared to A20, A0 elicited less pronounced effects on OM cells, suggesting renewable diesel induces less adverse effects in OM cells. Prior studies and these results suggest that PAHs may disturb the inflammatory process and xenobiotic metabolism in the OM and that UFPs might mediate harmful effects on the brain through the olfactory route. This study provides important information on the adverse effects of UFPs in a human-based in vitro model, therefore providing new insight to form the basis for mitigation and preventive actions against the possible toxicological impairments caused by UFP exposure.
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Affiliation(s)
- Laura Mussalo
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Simone Avesani
- Department of Computer Science, University of Verona, 37134 Verona, Italy
| | - Muhammad Ali Shahbaz
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Táňa Závodná
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic
| | - Liudmila Saveleva
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Anssi Järvinen
- VTT Technical Research Centre of Finland, VTT, 02044 Espoo, Finland
| | - Riikka Lampinen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Irina Belaya
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Zdeněk Krejčík
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic
| | - Mariia Ivanova
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Henri Hakkarainen
- Inhalation Toxicology Laboratory, Department of Environmental and Biological Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Juho Kalapudas
- Department of Neurology, Neuro Centre, Kuopio University Hospital, 70210 Kuopio, Finland
| | - Elina Penttilä
- Department of Otorhinolaryngology, University of Eastern Finland and Kuopio University Hospital, 70210 Kuopio, Finland
| | - Heikki Löppönen
- Department of Otorhinolaryngology, University of Eastern Finland and Kuopio University Hospital, 70210 Kuopio, Finland
| | - Anne M Koivisto
- Department of Neurology, Neuro Centre, Kuopio University Hospital, 70210 Kuopio, Finland; Brain Research Unit, Department of Neurology, School of Medicine, University of Eastern Finland, 70210 Kuopio, Finland; Department of Neurology and Geriatrics, Helsinki University Hospital and Neurosciences, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Tarja Malm
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Jan Topinka
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic
| | - Rosalba Giugno
- Department of Computer Science, University of Verona, 37134 Verona, Italy
| | | | - Sweelin Chew
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland
| | - Topi Rönkkö
- Aerosol Physics Laboratory, Physics Unit, Tampere University, 33014 Tampere, Finland
| | - Pasi Jalava
- Inhalation Toxicology Laboratory, Department of Environmental and Biological Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Katja M Kanninen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210 Kuopio, Finland.
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Shahbaz MA, Kuivanen S, Lampinen R, Mussalo L, Hron T, Závodná T, Ojha R, Krejčík Z, Saveleva L, Tahir NA, Kalapudas J, Koivisto AM, Penttilä E, Löppönen H, Singh P, Topinka J, Vapalahti O, Chew S, Balistreri G, Kanninen KM. Human-derived air-liquid interface cultures decipher Alzheimer's disease-SARS-CoV-2 crosstalk in the olfactory mucosa. J Neuroinflammation 2023; 20:299. [PMID: 38098019 PMCID: PMC10722731 DOI: 10.1186/s12974-023-02979-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 11/30/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND The neurological effects of the coronavirus disease of 2019 (COVID-19) raise concerns about potential long-term consequences, such as an increased risk of Alzheimer's disease (AD). Neuroinflammation and other AD-associated pathologies are also suggested to increase the risk of serious SARS-CoV-2 infection. Anosmia is a common neurological symptom reported in COVID-19 and in early AD. The olfactory mucosa (OM) is important for the perception of smell and a proposed site of viral entry to the brain. However, little is known about SARS-CoV-2 infection at the OM of individuals with AD. METHODS To address this gap, we established a 3D in vitro model of the OM from primary cells derived from cognitively healthy and AD individuals. We cultured the cells at the air-liquid interface (ALI) to study SARS-CoV-2 infection under controlled experimental conditions. Primary OM cells in ALI expressed angiotensin-converting enzyme 2 (ACE-2), neuropilin-1 (NRP-1), and several other known SARS-CoV-2 receptor and were highly vulnerable to infection. Infection was determined by secreted viral RNA content and confirmed with SARS-CoV-2 nucleocapsid protein (NP) in the infected cells by immunocytochemistry. Differential responses of healthy and AD individuals-derived OM cells to SARS-CoV-2 were determined by RNA sequencing. RESULTS Results indicate that cells derived from cognitively healthy donors and individuals with AD do not differ in susceptibility to infection with the wild-type SARS-CoV-2 virus. However, transcriptomic signatures in cells from individuals with AD are highly distinct. Specifically, the cells from AD patients that were infected with the virus showed increased levels of oxidative stress, desensitized inflammation and immune responses, and alterations to genes associated with olfaction. These results imply that individuals with AD may be at a greater risk of experiencing severe outcomes from the infection, potentially driven by pre-existing neuroinflammation. CONCLUSIONS The study sheds light on the interplay between AD pathology and SARS-CoV-2 infection. Altered transcriptomic signatures in AD cells may contribute to unique symptoms and a more severe disease course, with a notable involvement of neuroinflammation. Furthermore, the research emphasizes the need for targeted interventions to enhance outcomes for AD patients with viral infection. The study is crucial to better comprehend the relationship between AD, COVID-19, and anosmia. It highlights the importance of ongoing research to develop more effective treatments for those at high risk of severe SARS-CoV-2 infection.
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Affiliation(s)
- Muhammad Ali Shahbaz
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Suvi Kuivanen
- Department of Virology, Faculty of Medicine, University of Helsinki, 00290, Helsinki, Finland
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität Zu Berlin, Institute of Virology, 10117, Berlin, Germany
| | - Riikka Lampinen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Laura Mussalo
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Tomáš Hron
- Institute of Molecular Genetics, Czech Academy of Sciences, 142 20, Prague, Czech Republic
| | - Táňa Závodná
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine, Czech Academy of Sciences, 142 20, Prague, Czech Republic
| | - Ravi Ojha
- Department of Virology, Faculty of Medicine, University of Helsinki, 00290, Helsinki, Finland
| | - Zdeněk Krejčík
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine, Czech Academy of Sciences, 142 20, Prague, Czech Republic
| | - Liudmila Saveleva
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Numan Ahmad Tahir
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Juho Kalapudas
- Department of Neurology, Neuro Centre, Kuopio University Hospital, 70210, Kuopio, Finland
| | - Anne M Koivisto
- Department of Neurology, Neuro Centre, Kuopio University Hospital, 70210, Kuopio, Finland
- Brain Research Unit, Department of Neurology, School of Medicine, University of Eastern Finland, 70210, Kuopio, Finland
- Department of Neurology and Geriatrics, Helsinki University Hospital and Neurosciences, Faculty of Medicine, University of Helsinki, 00014, Helsinki, Finland
| | - Elina Penttilä
- Department of Otorhinolaryngology, University of Eastern Finland and Kuopio University Hospital, 70210, Kuopio, Finland
| | - Heikki Löppönen
- Department of Otorhinolaryngology, University of Eastern Finland and Kuopio University Hospital, 70210, Kuopio, Finland
| | | | - Jan Topinka
- Department of Genetic Toxicology and Epigenetics, Institute of Experimental Medicine, Czech Academy of Sciences, 142 20, Prague, Czech Republic
| | - Olli Vapalahti
- Department of Virology, Faculty of Medicine, University of Helsinki, 00290, Helsinki, Finland
| | - Sweelin Chew
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland
| | - Giuseppe Balistreri
- Department of Virology, Faculty of Medicine, University of Helsinki, 00290, Helsinki, Finland
- The Queensland Brain Institute, University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Katja M Kanninen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70210, Kuopio, Finland.
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Shahbaz MA, Kaiser SA, Schütte M, Berg T. Characterization of different endoscopic imaging systems in ultraviolet range for combustion applications. Appl Opt 2023; 62:4949-4957. [PMID: 37707273 DOI: 10.1364/ao.489440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 05/21/2023] [Indexed: 09/15/2023]
Abstract
Endoscopic optical diagnostics for IC engines offer the advantage of retaining the full operating range and thermal properties of the production engine. The custom-designed modular hybrid UV endoscope system is optimized for application in IC engines.; however, its hybrid refractive/diffractive relay element is expensive and has a narrow operating wavelength range. To make the endoscopic imaging more universally applicable, the hybrid relay element of the mentioned endoscope system was replaced by commercial UV camera lenses, and several combinations were characterized in terms of resolution, brightness, and chromatic aberration. With an unintensified CCD camera, endoscope systems using commercial camera lenses had better resolution at investigated magnifications of 0.5 and 1. However, with an intensified camera, the system with the hybrid relay lens had the best overall performance in its design wavelength range. Selected imaging systems were used in a spark-ignition engine to image O H ∗-chemiluminescence, with results consistent with those from bench-top characterization.
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Hogberg HT, Lam A, Ohayon E, Shahbaz MA, Clerbaux LA, Bal-Price A, Coecke S, Concha R, De Bernardi F, Edrosa E, Hargreaves AJ, Kanninen KM, Munoz A, Pistollato F, Saravanan S, Garcia-Reyero N, Wittwehr C, Sachana M. The Adverse Outcome Pathway Framework Applied to Neurological Symptoms of COVID-19. Cells 2022; 11:cells11213411. [PMID: 36359807 PMCID: PMC9658029 DOI: 10.3390/cells11213411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/20/2022] [Accepted: 10/24/2022] [Indexed: 12/15/2022] Open
Abstract
Several reports have shown that the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has the potential to also be neurotropic. However, the mechanisms by which SARS-CoV-2 induces neurologic injury, including neurological and/or psychological symptoms, remain unclear. In this review, the available knowledge on the neurobiological mechanisms underlying COVID-19 was organized using the AOP framework. Four AOPs leading to neurological adverse outcomes (AO), anosmia, encephalitis, stroke, and seizure, were developed. Biological key events (KEs) identified to induce these AOs included binding to ACE2, blood–brain barrier (BBB) disruption, hypoxia, neuroinflammation, and oxidative stress. The modularity of AOPs allows the construction of AOP networks to visualize core pathways and recognize neuroinflammation and BBB disruption as shared mechanisms. Furthermore, the impact on the neurological AOPs of COVID-19 by modulating and multiscale factors such as age, psychological stress, nutrition, poverty, and food insecurity was discussed. Organizing the existing knowledge along an AOP framework can represent a valuable tool to understand disease mechanisms and identify data gaps and potentially contribute to treatment, and prevention. This AOP-aligned approach also facilitates synergy between experts from different backgrounds, while the fast-evolving and disruptive nature of COVID-19 emphasizes the need for interdisciplinarity and cross-community research.
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Affiliation(s)
- Helena T. Hogberg
- National Toxicology Program Interagency Center for the Evaluation of Alternative Toxicological Methods, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27518, USA
- Johns Hopkins University, Baltimore, MD 21205, USA
- Correspondence: (H.T.H.); (M.S.)
| | - Ann Lam
- Green Neuroscience Laboratory, Neurolinx Research Institute, San Diego, CA 92111, USA
- Physicians Committee for Responsible Medicine, Washington, DC 20016, USA
| | - Elan Ohayon
- Green Neuroscience Laboratory, Neurolinx Research Institute, San Diego, CA 92111, USA
- Institute for Green & Open Sciences, Toronto, ON M6J 2J4, Canada
| | - Muhammad Ali Shahbaz
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | | | - Anna Bal-Price
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Sandra Coecke
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Rachel Concha
- Green Neuroscience Laboratory, Neurolinx Research Institute, San Diego, CA 92111, USA
| | - Francesca De Bernardi
- Division of Otorhinolaryngology, Department of Biotechnologies and Life Sciences, University of Insubria, Ospedale di Circolo e Fondazione Macchi, 21100 Varese, Italy
| | - Eizleayne Edrosa
- Green Neuroscience Laboratory, Neurolinx Research Institute, San Diego, CA 92111, USA
| | - Alan J. Hargreaves
- School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
| | - Katja M. Kanninen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Amalia Munoz
- European Commission, Joint Research Centre (JRC), 2440 Geel, Belgium
| | | | - Surat Saravanan
- Centre for Predictive Human Model Systems Atal Incubation Centre-Centre for Cellular and Molecular Biology, Hyderabad 500039, India
| | - Natàlia Garcia-Reyero
- Environmental Laboratory, US Army Engineer Research & Development Center, Vicksburg, MS 39180, USA
| | - Clemens Wittwehr
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Magdalini Sachana
- Environment Health and Safety Division, Environment Directorate, Organisation for Economic Cooperation and Development (OECD), 75016 Paris, France
- Correspondence: (H.T.H.); (M.S.)
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Shahbaz MA, De Bernardi F, Alatalo A, Sachana M, Clerbaux LA, Muñoz A, Parvatam S, Landesmann B, Kanninen KM, Coecke S. Mechanistic Understanding of the Olfactory Neuroepithelium Involvement Leading to Short-Term Anosmia in COVID-19 Using the Adverse Outcome Pathway Framework. Cells 2022; 11:3027. [PMID: 36230989 PMCID: PMC9563945 DOI: 10.3390/cells11193027] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/09/2022] [Accepted: 09/19/2022] [Indexed: 12/23/2022] Open
Abstract
Loss of the sense of smell (anosmia) has been included as a COVID-19 symptom by the World Health Organization. The majority of patients recover the sense of smell within a few weeks postinfection (short-term anosmia), while others report persistent anosmia. Several studies have investigated the mechanisms leading to anosmia in COVID-19; however, the evidence is scattered, and the mechanisms remain poorly understood. Based on a comprehensive review of the literature, we aim here to evaluate the current knowledge and uncertainties regarding the mechanisms leading to short-term anosmia following SARS-CoV-2 infection. We applied an adverse outcome pathway (AOP) framework, well established in toxicology, to propose a sequence of measurable key events (KEs) leading to short-term anosmia in COVID-19. Those KEs are (1) SARS-CoV-2 Spike proteins binding to ACE-2 expressed by the sustentacular (SUS) cells in the olfactory epithelium (OE); (2) viral entry into SUS cells; (3) viral replication in the SUS cells; (4) SUS cell death; (5) damage to the olfactory sensory neurons and the olfactory epithelium (OE). This AOP-aligned approach allows for the identification of gaps where more research should be conducted and where therapeutic intervention could act. Finally, this AOP gives a frame to explain several disease features and can be linked to specific factors that lead to interindividual differences in response to SARS-CoV-2 infection.
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Affiliation(s)
- Muhammad Ali Shahbaz
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Francesca De Bernardi
- Division of Otorhinolaryngology, Department of Biotechnologies and Life Sciences, University of Insubria, Ospedale di Circolo e Fondazione Macchi, 21100 Varese, Italy
| | - Arto Alatalo
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Magdalini Sachana
- Environment Health and Safety Division, Environment Directorate, Organisation for Economic Cooperation and Development (OECD), 75775 Paris, France
| | | | - Amalia Muñoz
- European Commission, Joint Research Centre (JRC), 2440 Geel, Belgium
| | - Surat Parvatam
- Centre for Predictive Human Model Systems, Atal Incubation Centre-Centre for Cellular and Molecular Biology (AIC-CCMB), Habsiguda, Hyderabad 500039, India
| | | | - Katja M. Kanninen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland
| | - Sandra Coecke
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
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Shahbaz MA, Martikainen MV, Rönkkö TJ, Komppula M, Jalava PI, Roponen M. Urban air PM modifies differently immune defense responses against bacterial and viral infections in vitro. Environ Res 2021; 192:110244. [PMID: 32980306 PMCID: PMC7516585 DOI: 10.1016/j.envres.2020.110244] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/09/2020] [Accepted: 09/17/2020] [Indexed: 05/05/2023]
Abstract
Epidemiological evidence has shown the association between exposure to ambient fine particulate matter (PM) and increased susceptibility to bacterial and viral respiratory infections. However, to date, the underlying mechanisms of immunomodulatory effects of PM remain unclear. Our objective was to explore how exposure to relatively low doses of urban air PM alters innate responses to bacterial and viral stimuli in vitro. We used secondary alveolar epithelial cell line along with monocyte-derived macrophages to replicate innate lung barrier in vitro. Co-cultured cells were first exposed for 24 h to PM2.5-1 (particle aerodynamic diameter between 1 and 2.5 μm) and subsequently for an additional 24 h to lipopolysaccharide (TLR4), polyinosinic-polycytidylic acid (TLR3), and synthetic single-stranded RNA oligoribonucleotides (TLR7/8) to mimic bacterial or viral stimulation. Toxicological endpoints included pro-inflammatory cytokines (IL-8, IL-6, and TNF-α), cellular metabolic activity, and cell cycle phase distribution. We show that cells exposed to PM2.5-1 produced higher levels of pro-inflammatory cytokines following stimulation with bacterial TLR4 ligand than cells exposed to PM2.5-1 or bacterial ligand alone. On the contrary, PM2.5-1 exposure reduced pro-inflammatory responses to viral ligands TLR3 and TLR7/8. Cell cycle analysis indicated that viral ligands induced cell cycle arrest at the G2-M phase. In PM-primed co-cultures, however, they failed to induce the G2-M phase arrest. Contrarily, bacterial stimulation caused a slight increase in cells in the sub-G1 phase but in PM2.5-1 primed co-cultures the effect of bacterial stimulation was masked by PM2.5-1. These findings indicate that PM2.5-1 may alter responses of immune defense differently against bacterial and viral infections. Further studies are required to explain the mechanism of immune modulation caused by PM in altering the susceptibility to respiratory infections.
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Affiliation(s)
- Muhammad Ali Shahbaz
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211, Kuopio, Finland.
| | - Maria-Viola Martikainen
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Teemu J Rönkkö
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Mika Komppula
- Finnish Meteorological Institute, Yliopistonranta 1F, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Pasi I Jalava
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Marjut Roponen
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211, Kuopio, Finland
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