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Samuelson D, Villageliu D, Cunningham K, Smith D, Knoell D, Mandolfo M, Wyatt T. Regulation of Natural Killer Cell TGF-β and AhR Signaling Pathways Via the Intestinal Microbiota is Critical for Host Defense Against Alcohol-Associated Bacterial Pneumonia. RESEARCH SQUARE 2023:rs.3.rs-3328953. [PMID: 37886455 PMCID: PMC10602187 DOI: 10.21203/rs.3.rs-3328953/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Alcohol use is an independent risk factor for the development of bacterial pneumonia due, in part, to impaired mucus-facilitated clearance, macrophage phagocytosis, and recruitment of neutrophils. Alcohol consumption is also known to reduce peripheral natural killer (NK) cell numbers and compromises NK cell cytolytic activity, especially NK cells with a mature phenotype. However, the role of innate lymphocytes, such as NK cells during host defense against alcohol-associated bacterial pneumonia is essentially unknown. We have previously shown that indole supplementation mitigates increases in pulmonary bacterial burden and improves pulmonary NK cell recruitment in alcohol-fed mice, which were dependent of aryl hydrocarbon receptor (AhR) signaling. Employing a binge-on-chronic alcohol-feeding model we sought to define the role and interaction of indole and NK cells during pulmonary host defense against alcohol-associated pneumonia. We demonstrate that alcohol dysregulates NK cell effector function and pulmonary recruitment via alterations in two key signaling pathways. We found that alcohol increases transforming growth factor beta (TGF-β) signaling, while suppressing AhR signaling. We further demonstrated that NK cells isolated from alcohol-fed mice have a reduced ability to kill Klebsiella pneumoniae. NK cell migratory capacity to chemokines was also significantly altered by alcohol, as NK cells isolated from alcohol-fed mice exhibited preferential migration in response to CXCR3 chemokines but exhibited reduced migration in response to CCR2, CXCR4, and CX3CR1 chemokines. Together this data suggests that alcohol disrupts NK cell specific TGF-β and AhR signaling pathways leading to decreased pulmonary recruitment and cytolytic activity thereby increasing susceptibility to alcohol-associated bacterial pneumonia.
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Cunningham KC, Smith DR, Villageliú DN, Ellis CM, Ramer-Tait AE, Price JD, Wyatt TA, Knoell DL, Samuelson MM, Molina PE, Welsh DA, Samuelson DR. Human Alcohol-Microbiota Mice have Increased Susceptibility to Bacterial Pneumonia. Cells 2023; 12:2267. [PMID: 37759490 PMCID: PMC10526526 DOI: 10.3390/cells12182267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/31/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
Preclinical studies have shown that chronic alcohol abuse leads to alterations in the gastrointestinal microbiota that are associated with behavior changes, physiological alterations, and immunological effects. However, such studies have been limited in their ability to evaluate the direct effects of alcohol-associated dysbiosis. To address this, we developed a humanized alcohol-microbiota mouse model to systematically evaluate the immunological effects of chronic alcohol abuse mediated by intestinal dysbiosis. Germ-free mice were colonized with human fecal microbiota from individuals with high and low Alcohol Use Disorders Identification Test (AUDIT) scores and bred to produce human alcohol-associated microbiota or human control-microbiota F1 progenies. F1 offspring colonized with fecal microbiota from individuals with high AUDIT scores had increased susceptibility to Klebsiella pneumoniae and Streptococcus pneumoniae pneumonia, as determined by increased mortality rates, pulmonary bacterial burden, and post-infection lung damage. These findings highlight the importance of considering both the direct effects of alcohol and alcohol-induced dysbiosis when investigating the mechanisms behind alcohol-related disorders and treatment strategies.
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Affiliation(s)
- Kelly C. Cunningham
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Deandra R. Smith
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Daniel N. Villageliú
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Christi M. Ellis
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Amanda E. Ramer-Tait
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
- Nebraska Food for Health Center, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Jeffrey D. Price
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
- Nebraska Food for Health Center, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Todd A. Wyatt
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Department of Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE 68198, USA
| | - Daren L. Knoell
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Mystera M. Samuelson
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Animal Behavior Core, University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Patricia E. Molina
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - David A. Welsh
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Derrick R. Samuelson
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Nebraska Food for Health Center, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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Dou L, Liu R, Wang Z, Huang Z, Wang L, Lin M, Hou X, Zhang J, Cheng T, He Q, Wang D, Guo D, An R, Wei L, Yao Y, Zhang Y. Black phosphorus quantum dots induced ferroptosis in lung cell via increasing lipid peroxidation and iron accumulation. Food Chem Toxicol 2023; 179:113952. [PMID: 37481226 DOI: 10.1016/j.fct.2023.113952] [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: 06/12/2023] [Revised: 07/11/2023] [Accepted: 07/19/2023] [Indexed: 07/24/2023]
Abstract
Black Phosphorus Quantum Dots (BP-QDs) have potential applications in biomedicine. BP-QDs may enter the body through the respiratory tract during grinding and crushing production and processing, causing respiratory toxicity. Ferroptosis is an oxidative, iron-dependent form of cell death. Here, respiratory toxicity of BP-QDs has been validated in mice and human bronchial epithelial cells. After 24 h of exposure to different doses (4-32 μg/mL) of BP-QDs, intracellular lipid peroxidation and iron overload occurred in Beas-2B cells. After 4 times exposures by noninvasive tracheal instillation at four doses [0, 0.25, 0.5 and 1 (mg/kg/48h)], all animals were sacrificed, organs were removed, processed for pathological examination and molecular analysis. Iron overload, glutathione (GSH) depletion and lipid peroxidation in the lung tissue of mice in the exposure group. Furthermore, based on the ferroptosis-associated protein and mRNA expression, it was hypothesized that BP-QDs induced ferroptosis through increasing intracellular free iron and polyunsaturated fatty acid synthesis. By comparing with previous studies, we speculate that primary cells generally are more sensitive to BP-QDs-induced damage than cancer cells. In summary, findings in the present study confirmed that BP-QDs induce ferroptosis via increasing lipid peroxidation and iron accumulation in vitro and in vivo.
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Affiliation(s)
- Liangding Dou
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Rong Liu
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Zhaojizhe Wang
- School of Medicine, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Zhi Huang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Lei Wang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Mo Lin
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Xin Hou
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Jinwen Zhang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Tantan Cheng
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Qi He
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Dai Wang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Dongbei Guo
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Ran An
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Lifang Wei
- Department of Nephrology, The Third People's Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, Fujian, China.
| | - Youliang Yao
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
| | - Yongxing Zhang
- State Key Laboratory of Vaccines for Infectious Diseases, Xiang an Biomedicine Laboratory, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, China.
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Chechi JL, da Costa FAC, Figueiredo JM, de Souza CM, Valdez AF, Zamith-Miranda D, Camara AC, Taborda CP, Nosanchuk JD. Vaccine development for pathogenic fungi: current status and future directions. Expert Rev Vaccines 2023; 22:1136-1153. [PMID: 37936254 DOI: 10.1080/14760584.2023.2279570] [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: 08/01/2023] [Accepted: 11/01/2023] [Indexed: 11/09/2023]
Abstract
INTRODUCTION Fungal infections are caused by a broad range of pathogenic fungi that are found worldwide with different geographic distributions, incidences, and mortality rates. Considering that there are relatively few approved medications available for combating fungal diseases and no vaccine formulation commercially available, multiple groups are searching for new antifungal drugs, examining drugs for repurposing and developing antifungal vaccines, in order to control deaths, sequels, and the spread of these complex infections. AREAS COVERED This review provides a summary of advances in fungal vaccine studies and the different approaches under development, such as subunit vaccines, whole organism vaccines, and DNA vaccines, as well as studies that optimize the use of adjuvants. We conducted a literature search of the PubMed with terms: fungal vaccines and genus of fungal pathogens (Cryptococcus spp. Candida spp. Coccidioides spp. Aspergillus spp. Sporothrix spp. Histoplasma spp. Paracoccidioides spp. Pneumocystis spp. and the Mucorales order), a total of 177 articles were collected from database. EXPERT OPINION Problems regarding the immune response development in an immunocompromised organism, the similarity between fungal and mammalian cells, and the lack of attention by health organizations to fungal infections are closely related to the fact that, at present, there are no fungal vaccines available for clinical use.
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Affiliation(s)
- Jéssica L Chechi
- Laboratório de Fungos Dimórficos Patogênicos, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, SP, SP, Brazil
| | - Felipe A C da Costa
- Laboratório de Fungos Dimórficos Patogênicos, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, SP, SP, Brazil
- Laboratório de Micologia Médica (LIM-53), Departamento de Dermatologia, Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, SP, SP, Brazil
| | - Julia M Figueiredo
- Laboratório de Fungos Dimórficos Patogênicos, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, SP, SP, Brazil
| | - Cássia M de Souza
- Laboratório de Fisiologia e Biologia Molecular de Fungos, Departamento de Microbiologia, Universidade Estadual de Londrina, Londrina, Brazil
- Instituto Carlos Chagas, Fundação Oswaldo, Cruz (Fiocruz), Curitiba, Paraná, Brazil
| | - Alessandro F Valdez
- Departments of Medicine (Division of Infectious Diseases) and Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Daniel Zamith-Miranda
- Departments of Medicine (Division of Infectious Diseases) and Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Aline C Camara
- Laboratório de Fungos Dimórficos Patogênicos, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, SP, SP, Brazil
- Laboratório de Micologia Médica (LIM-53), Departamento de Dermatologia, Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, SP, SP, Brazil
| | - Carlos P Taborda
- Laboratório de Fungos Dimórficos Patogênicos, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, SP, SP, Brazil
- Laboratório de Micologia Médica (LIM-53), Departamento de Dermatologia, Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de São Paulo, SP, SP, Brazil
| | - Joshua D Nosanchuk
- Departments of Medicine (Division of Infectious Diseases) and Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA
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Samuelson DR, Smith DR, Cunningham KC, Wyatt TA, Hall SC, Murry DJ, Chhonker YS, Knoell DL. ZIP8-Mediated Intestinal Dysbiosis Impairs Pulmonary Host Defense against Bacterial Pneumonia. Int J Mol Sci 2022; 23:1022. [PMID: 35162945 PMCID: PMC8834709 DOI: 10.3390/ijms23031022] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/12/2022] [Accepted: 01/14/2022] [Indexed: 02/06/2023] Open
Abstract
Pneumococcal pneumonia is a leading cause of morbidity and mortality worldwide. An increased susceptibility is due, in part, to compromised immune function. Zinc is required for proper immune function, and an insufficient dietary intake increases the risk of pneumonia. Our group was the first to reveal that the Zn transporter, ZIP8, is required for host defense. Furthermore, the gut microbiota that is essential for lung immunity is adversely impacted by a commonly occurring defective ZIP8 allele in humans. Taken together, we hypothesized that loss of the ZIP8 function would lead to intestinal dysbiosis and impaired host defense against pneumonia. To test this, we utilized a novel myeloid-specific Zip8KO mouse model in our studies. The comparison of the cecal microbial composition of wild-type and Zip8KO mice revealed significant differences in microbial community structure. Most strikingly, upon a S. pneumoniae lung infection, mice recolonized with Zip8KO-derived microbiota exhibited an increase in weight loss, bacterial dissemination, and lung inflammation compared to mice recolonized with WT microbiota. For the first time, we reveal the critical role of myeloid-specific ZIP8 on the maintenance of the gut microbiome structure, and that loss of ZIP8 leads to intestinal dysbiosis and impaired host defense in the lung. Given the high incidence of dietary Zn deficiency and the ZIP8 variant allele in the human population, additional investigation is warranted to improve surveillance and treatment strategies.
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Affiliation(s)
- Derrick R. Samuelson
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA; (K.C.C.); (T.A.W.)
| | - Deandra R. Smith
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA; (D.R.S.); (S.C.H.); (D.J.M.); (Y.S.C.)
| | - Kelly C. Cunningham
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA; (K.C.C.); (T.A.W.)
| | - Todd A. Wyatt
- Department of Internal Medicine-Pulmonary Division, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA; (K.C.C.); (T.A.W.)
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE 68105, USA
| | - Sannette C. Hall
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA; (D.R.S.); (S.C.H.); (D.J.M.); (Y.S.C.)
| | - Daryl J. Murry
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA; (D.R.S.); (S.C.H.); (D.J.M.); (Y.S.C.)
| | - Yashpal S. Chhonker
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA; (D.R.S.); (S.C.H.); (D.J.M.); (Y.S.C.)
| | - Daren L. Knoell
- Department of Pharmacy Practice and Science, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE 68198, USA; (D.R.S.); (S.C.H.); (D.J.M.); (Y.S.C.)
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Cruz CS, Ricci MF, Vieira AT. Gut Microbiota Modulation as a Potential Target for the Treatment of Lung Infections. Front Pharmacol 2021; 12:724033. [PMID: 34557097 PMCID: PMC8453009 DOI: 10.3389/fphar.2021.724033] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/20/2021] [Indexed: 12/12/2022] Open
Abstract
The gastrointestinal and respiratory systems are colonized by a complex ecosystem of microorganisms called the microbiota. These microorganisms co-evolved over millions of years with the host, creating a symbiotic relationship that is fundamental for promoting host homeostasis by producing bioactive metabolites and antimicrobial molecules, and regulating the immune and inflammatory responses. Imbalance in the abundance, diversity, and function of the gut microbiota (known as dysbiosis) have been shown to increase host susceptibility to infections in the lungs, suggesting crosstalk between these organs. This crosstalk is now referred to as the gut-lung axis. Hence, the use of probiotics, prebiotics, and synbiotics for modulation of gut microbiota has been studied based on their effectiveness in reducing the duration and severity of respiratory tract infections, mainly owing to their effects on preventing pathogen colonization and modulating the immune system. This review discusses the role and responses of probiotics, prebiotics, and synbiotics in the gut-lung axis in the face of lung infections.
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Affiliation(s)
- Clênio Silva Cruz
- Laboratory of Microbiota and Immunomodulation (LMI), Department of Biochemistry and Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Mayra Fernanda Ricci
- Laboratory of Microbiota and Immunomodulation (LMI), Department of Biochemistry and Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Angélica Thomaz Vieira
- Laboratory of Microbiota and Immunomodulation (LMI), Department of Biochemistry and Immunology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Samuelson DR, Gu M, Shellito JE, Molina PE, Taylor CM, Luo M, Welsh DA. Pulmonary immune cell trafficking promotes host defense against alcohol-associated Klebsiella pneumonia. Commun Biol 2021; 4:997. [PMID: 34426641 PMCID: PMC8382828 DOI: 10.1038/s42003-021-02524-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 08/05/2021] [Indexed: 12/15/2022] Open
Abstract
The intestinal microbiota generates many different metabolites which are critical for the regulation of host signaling pathways. In fact, a wide-range of diseases are associated with increased levels of local or systemic microbe-derived metabolites. In contrast, certain bacterial metabolites, such as tryptophan metabolites, are known to contribute to both local and systemic homeostasis. Chronic alcohol consumption is accompanied by alterations to intestinal microbial communities, and their functional capacities. However, little is known about the role of alcohol-associated dysbiosis on host defense against bacterial pneumonia. Our previous work using fecal transplantation demonstrated that alcohol-associated intestinal dysbiosis, independent of ethanol consumption, increased susceptibility to Klebsiella pneumonia. Here, we demonstrate that intestinal microbiota treatments mitigate the increased risk of alcohol-associated pneumonia. Treatment with the microbial metabolite indole or with probiotics reduced pulmonary and extrapulmonary bacterial burden, restored immune responses, and improved cellular trafficking required for host defense. Protective effects were, in part, mediated by aryl hydrocarbon receptors (AhR), as inhibition of AhR diminished the protective effects. Thus, alcohol appears to impair the production/processing of tryptophan catabolites resulting in immune dysregulation and impaired cellular trafficking. These data support microbiota therapeutics as novel strategies to mitigate the increased risk for alcohol-associated bacterial pneumonia. Samuelson et al show that alcohol impairs the production/processing of microbial metabolites, specifically tryptophan catabolites, resulting in immune dysregulation and impaired cellular trafficking for optimal host defense. The metabolite, indole, or probiotics making indole metabolites mitigate alcohol-induced susceptibility to Klebsiella-associated pneumonia, and that the mechanisms are partially dependent on AhR.
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Affiliation(s)
- Derrick R Samuelson
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA. .,Department of Internal Medicine, Division of Pulmonary, Critical Care, & Sleep, University of Nebraska Medical Center, Omaha, NE, USA.
| | - Min Gu
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Judd E Shellito
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Patricia E Molina
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Christopher M Taylor
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Meng Luo
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - David A Welsh
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
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Gu M, Samuelson DR, Taylor CM, Molina PE, Luo M, Siggins RW, Shellito JE, Welsh DA. Alcohol-associated intestinal dysbiosis alters mucosal-associated invariant T-cell phenotype and function. Alcohol Clin Exp Res 2021; 45:934-947. [PMID: 33704802 PMCID: PMC8283808 DOI: 10.1111/acer.14589] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Chronic alcohol consumption is associated with a compromised innate and adaptive immune responses to infectious disease. Mucosa-associated invariant T (MAIT) cells play a critical role in antibacterial host defense. However, whether alcohol-associated deficits in innate and adaptive immune responses are mediated by alterations in MAIT cells remains unclear. METHODS To investigate the impact of alcohol on MAIT cells, mice were treated with binge-on-chronic alcohol for 10 days and sacrificed at day 11. MAIT cells in the barrier organs (lung, liver, and intestine) were characterized by flow cytometry. Two additional sets of animals were used to examine the involvement of gut microbiota on alcohol-induced MAIT cell changes: (1) Cecal microbiota from alcohol-fed (AF) mice were adoptive transferred into antibiotic-pretreated mice and (2) AF mice were treated with antibiotics during the experiment. MAIT cells in the barrier organs were measured via flow cytometry. RESULTS Binge-on-chronic alcohol feeding led to a significant reduction in the abundance of MAIT cells in the barrier tissues. However, CD69 expression on tissue-associated MAIT cells was increased in AF mice compared with pair-fed (PF) mice. The expression of Th1 cytokines and the corresponding transcriptional factor was tissue specific, showing downregulation in the intestine and increases in the lung and liver in AF animals. Transplantation of fecal microbiota from AF mice resulted in a MAIT cell profile aligned to that of AF mouse donor. Antibiotic treatment abolished the MAIT cell differences between AF and PF animals. CONCLUSION MAIT cells in the intestine, liver, and lung are perturbed by alcohol use and these changes are partially attributable to alcohol-associated dysbiosis. MAIT cell dysfunction may contribute to alcohol-induced innate and adaptive immunity and consequently end-organ pathophysiology.
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Affiliation(s)
- Min Gu
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - Derrick R. Samuelson
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Department of Internal Medicine, Division of Pulmonary, Critical Care, & Sleep, University of Nebraska Medical Center, Omaha, NE, USA
| | - Christopher M. Taylor
- Department of Microbiology, Immunology, & Parasitology, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - Patricia E. Molina
- Department of Physiology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - Meng Luo
- Department of Microbiology, Immunology, & Parasitology, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - Robert W. Siggins
- Department of Physiology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - Judd E. Shellito
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Department of Microbiology, Immunology, & Parasitology, Louisiana State University Health Science Center, New Orleans, LA, USA
| | - David A. Welsh
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Department of Microbiology, Immunology, & Parasitology, Louisiana State University Health Science Center, New Orleans, LA, USA
- Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Science Center, New Orleans, LA, USA
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9
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Edey MM, Gunasekera PN, Lobb M, Imran M. Intravenous immunoglobulin as adjunctive therapy in kidney transplant recipients with severe pneumocystis pneumonia. Transpl Infect Dis 2020; 23:e13454. [PMID: 32869412 DOI: 10.1111/tid.13454] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/17/2020] [Accepted: 08/20/2020] [Indexed: 12/28/2022]
Abstract
Pneumocystis jirovecii is an opportunistic pathogen that may cause severe, life-threatening respiratory infections in immunocompromised patients such as those with kidney transplants. Although antimicrobial prophylaxis is now universally recommended in the early post-transplant period, Pneumocystis pneumonia (PCP) can occur later. If such infection occurs, mortality rates are high. Beyond standard therapy with trimethoprim-sulfamethoxazole, there is a lack of evidence-based options for intensifying treatment when initial therapy fails to show improvement. Moreover, it is usual to minimize immunosuppression in life-threatening infection, but graft damage may occur, particularly in kidney transplant recipients at above-average immunological risk. Here we present two cases of severe PCP in high immunological risk recipients who were managed with adjunctive intravenous immunoglobulin and withdrawal of immunosuppression. Both patients recovered and were discharged from hospital with functioning grafts.
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Affiliation(s)
- Matthew M Edey
- Department of Nephrology, Hull University Teaching Hospitals NHS Trust, Hull, UK.,Hull-York Medical School, Kingston-upon-Hull, UK
| | - Pumali N Gunasekera
- Department of Critical Care Medicine, Hull University Teaching Hospitals NHS Trust, Hull, UK
| | - Mark Lobb
- Department of Transplant and Cellular Immunology, St James's University Hospital, Leeds, UK
| | - Muhammad Imran
- Department of Nephrology, Hull University Teaching Hospitals NHS Trust, Hull, UK.,Hull-York Medical School, Kingston-upon-Hull, UK
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10
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Evans HM, Garvy BA. The trophic life cycle stage of Pneumocystis species induces protective adaptive responses without inflammation-mediated progression to pneumonia. Med Mycol 2019; 56:994-1005. [PMID: 29267980 DOI: 10.1093/mmy/myx145] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 11/22/2017] [Indexed: 12/28/2022] Open
Abstract
Pneumocystis species are fungal pathogens that cause pneumonia in immunocompromised hosts. Lung damage during Pneumocystis pneumonia is predominately due to the inflammatory immune response. Pneumocystis species have a biphasic life cycle. Optimal innate immune responses to Pneumocystis species are dependent on stimulation with the cyst life cycle stage. Conversely, the trophic life cycle stage broadly suppresses proinflammatory responses to multiple pathogen-associated molecular patterns (PAMPs), including β-1,3-glucan. Little is known about the contribution of these life cycle stages to the development of protective adaptive responses to Pneumocystis infection. Here we report that CD4+ T cells primed in the presence of trophic forms are sufficient to mediate clearance of trophic forms and cysts. In addition, primary infection with trophic forms is sufficient to prime B-cell memory responses capable of clearing a secondary infection with Pneumocystis following CD4+ T cell depletion. While trophic forms are sufficient for initiation of adaptive immune responses in immunocompetent mice, infection of immunocompromised recombination-activating gene 2 knockout (RAG2-/-) mice with trophic forms in the absence of cysts does not lead to the severe weight loss and infiltration of innate immune cells associated with the development of Pneumocystis pneumonia.
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Affiliation(s)
- Heather M Evans
- Department of Microbiology, Immunology, and Molecular Genetics
| | - Beth A Garvy
- Department of Microbiology, Immunology, and Molecular Genetics.,Division of Infectious Diseases, College of Medicine, University of Kentucky, Lexington, Kentucky
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11
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Samuelson DR, Burnham EL, Maffei VJ, Vandivier RW, Blanchard EE, Shellito JE, Luo M, Taylor CM, Welsh DA. The respiratory tract microbial biogeography in alcohol use disorder. Am J Physiol Lung Cell Mol Physiol 2018; 314:L107-L117. [PMID: 28860145 PMCID: PMC5866426 DOI: 10.1152/ajplung.00277.2017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/24/2017] [Accepted: 08/24/2017] [Indexed: 11/22/2022] Open
Abstract
Individuals with alcohol use disorders (AUDs) are at an increased risk of pneumonia and acute respiratory distress syndrome. Data of the lung microbiome in the setting of AUDs are lacking. The objective of this study was to determine the microbial biogeography of the upper and lower respiratory tract in individuals with AUDs compared with non-AUD subjects. Gargle, protected bronchial brush, and bronchoalveolar lavage specimens were collected during research bronchoscopies. Bacterial 16S gene sequencing and phylogenetic analysis was performed, and the alterations to the respiratory tract microbiota and changes in microbial biogeography were determined. The microbial structure of the upper and lower respiratory tract was significantly altered in subjects with AUDs compared with controls. Subjects with AUD have greater microbial diversity [ P < 0.0001, effect size = 16 ± 1.7 observed taxa] and changes in microbial species relative abundances. Furthermore, microbial communities in the upper and lower respiratory tract displayed greater similarity in subjects with AUDs. Alcohol use is associated with an altered composition of the respiratory tract microbiota. Subjects with AUDs demonstrate convergence of the microbial phylogeny and taxonomic communities between distinct biogeographical sites within the respiratory tract. These results support a mechanistic pathway potentially explaining the increased incidence of pneumonia and lung diseases in patients with AUDs.
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Affiliation(s)
- Derrick R. Samuelson
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Ellen L. Burnham
- Department of Medicine, Division of Pulmonary Sciences & Critical Care, University of Colorado-Anschutz Medical Campus, Aurora, Colorado
| | - Vincent J. Maffei
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - R. William Vandivier
- Department of Medicine, Division of Pulmonary Sciences & Critical Care, University of Colorado-Anschutz Medical Campus, Aurora, Colorado
| | - Eugene E. Blanchard
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Judd E. Shellito
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Meng Luo
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - Christopher M. Taylor
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
| | - David A. Welsh
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana
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12
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Antifungal Resistance, Metabolic Routes as Drug Targets, and New Antifungal Agents: An Overview about Endemic Dimorphic Fungi. Mediators Inflamm 2017; 2017:9870679. [PMID: 28694566 PMCID: PMC5485324 DOI: 10.1155/2017/9870679] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/28/2017] [Accepted: 05/23/2017] [Indexed: 12/30/2022] Open
Abstract
Diseases caused by fungi can occur in healthy people, but immunocompromised patients are the major risk group for invasive fungal infections. Cases of fungal resistance and the difficulty of treatment make fungal infections a public health problem. This review explores mechanisms used by fungi to promote fungal resistance, such as the mutation or overexpression of drug targets, efflux and degradation systems, and pleiotropic drug responses. Alternative novel drug targets have been investigated; these include metabolic routes used by fungi during infection, such as trehalose and amino acid metabolism and mitochondrial proteins. An overview of new antifungal agents, including nanostructured antifungals, as well as of repositioning approaches is discussed. Studies focusing on the development of vaccines against antifungal diseases have increased in recent years, as these strategies can be applied in combination with antifungal therapy to prevent posttreatment sequelae. Studies focused on the development of a pan-fungal vaccine and antifungal drugs can improve the treatment of immunocompromised patients and reduce treatment costs.
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13
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Samuelson DR, Shellito JE, Maffei VJ, Tague ED, Campagna SR, Blanchard EE, Luo M, Taylor CM, Ronis MJJ, Molina PE, Welsh DA. Alcohol-associated intestinal dysbiosis impairs pulmonary host defense against Klebsiella pneumoniae. PLoS Pathog 2017; 13:e1006426. [PMID: 28604843 PMCID: PMC5481032 DOI: 10.1371/journal.ppat.1006426] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 06/22/2017] [Accepted: 05/22/2017] [Indexed: 02/07/2023] Open
Abstract
Chronic alcohol consumption perturbs the normal intestinal microbial communities (dysbiosis). To investigate the relationship between alcohol-mediated dysbiosis and pulmonary host defense we developed a fecal adoptive transfer model, which allows us to investigate the impact of alcohol-induced gut dysbiosis on host immune response to an infectious challenge at a distal organ, independent of prevailing alcohol use. Male C57BL/6 mice were treated with a cocktail of antibiotics (ampicillin, gentamicin, neomycin, vancomycin, and metronidazole) via daily gavage for two weeks. A separate group of animals was fed a chronic alcohol (or isocaloric dextrose pair-fed controls) liquid diet for 10 days. Microbiota-depleted mice were recolonized with intestinal microbiota from alcohol-fed or pair-fed (control) animals. Following recolonization groups of mice were sacrificed prior to and 48 hrs. post respiratory infection with Klebsiella pneumoniae. Klebsiella lung burden, lung immunology and inflammation, as well as intestinal immunology, inflammation, and barrier damage were examined. Results showed that alcohol-associated susceptibility to K. pneumoniae is, in part, mediated by gut dysbiosis, as alcohol-naïve animals recolonized with a microbiota isolated from alcohol-fed mice had an increased respiratory burden of K. pneumoniae compared to mice recolonized with a control microbiota. The increased susceptibility in alcohol-dysbiosis recolonized animals was associated with an increase in pulmonary inflammatory cytokines, and a decrease in the number of CD4+ and CD8+ T-cells in the lung following Klebsiella infection but an increase in T-cell counts in the intestinal tract following Klebsiella infection, suggesting intestinal T-cell sequestration as a factor in impaired lung host defense. Mice recolonized with an alcohol-dysbiotic microbiota also had increased intestinal damage as measured by increased levels of serum intestinal fatty acid binding protein. Collectively, these results suggest that alterations in the intestinal immune response as a consequence of alcohol-induced dysbiosis contribute to increased host susceptibility to Klebsiella pneumonia.
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Affiliation(s)
- Derrick R. Samuelson
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
- * E-mail:
| | - Judd E. Shellito
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Vincent J. Maffei
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Eric D. Tague
- The Department of Chemistry, The University of Tennessee Knoxville, Knoxville, TN, United States of America
| | - Shawn R. Campagna
- The Department of Chemistry, The University of Tennessee Knoxville, Knoxville, TN, United States of America
| | - Eugene E. Blanchard
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Meng Luo
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Christopher M. Taylor
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Martin J. J. Ronis
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - Patricia E. Molina
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
| | - David A. Welsh
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, United States of America
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14
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Samuelson DR, Charles TP, de la Rua NM, Taylor CM, Blanchard EE, Luo M, Shellito JE, Welsh DA. Analysis of the intestinal microbial community and inferred functional capacities during the host response to Pneumocystis pneumonia. Exp Lung Res 2016; 42:425-439. [PMID: 27925857 PMCID: PMC5304582 DOI: 10.1080/01902148.2016.1258442] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 11/04/2016] [Indexed: 12/15/2022]
Abstract
BACKGROUND Pneumocystis pneumonia is a major cause of morbidity and mortality in patients infected with HIV/AIDS. In this study, we evaluated the intestinal microbial communities associated with the development of experimental Pneumocystis pneumonia, as there is growing evidence that the intestinal microbiota is critical for host defense against fungal pathogens. METHODS C57BL/6 mice were infected with live Pneumocystis murina (P. murina) via intratracheal inoculation and sacrificed 7 and 14 days postinfection for microbiota analysis. In addition, we evaluated the intestinal microbiota from CD4+ T cell depleted mice infected with P. murina. RESULTS We found that the diversity of the intestinal microbial community was significantly altered by respiratory infection with P. murina. Specifically, mice infected with P. murina had altered microbial populations, as judged by changes in diversity metrics and relative taxa abundances. We also found that CD4+ T cell depleted mice infected with P. murina exhibited significantly altered intestinal microbiota that was distinct from immunocompetent mice infected with P. murina, suggesting that loss of CD4+ T cells may also affects the intestinal microbiota in the setting of Pneumocystis pneumonia. Finally, we employed a predictive metagenomics approach to evaluate various microbial features. We found that Pneumocystis pneumonia significantly alters the intestinal microbiota's inferred functional potential for carbohydrate, energy, and xenobiotic metabolism, as well as signal transduction pathways. CONCLUSIONS Our study provides insight into specific-microbial clades and inferred microbial functional pathways associated with Pneumocystis pneumonia. Our data also suggest a role for the gut-lung axis in host defense in the lung.
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Affiliation(s)
- Derrick R. Samuelson
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Tysheena P. Charles
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Nicholas M. de la Rua
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Christopher M. Taylor
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Eugene E. Blanchard
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Meng Luo
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - Judd E. Shellito
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
| | - David A. Welsh
- Department of Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA, 70112
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15
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de la Rua NM, Samuelson DR, Charles TP, Welsh DA, Shellito JE. CD4(+) T-Cell-Independent Secondary Immune Responses to Pneumocystis Pneumonia. Front Immunol 2016; 7:178. [PMID: 27242785 PMCID: PMC4862974 DOI: 10.3389/fimmu.2016.00178] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/25/2016] [Indexed: 01/12/2023] Open
Abstract
Pneumocystis pneumonia is a major cause of morbidity and mortality among immunocompromised patients, especially in the context of HIV/AIDS. In the murine model of Pneumocystis pneumonia, CD4+ T-cells are required for clearance of a primary infection of Pneumocystis, but not the memory recall response. We hypothesized that the memory recall response in the absence of CD4+ T-cells is mediated by a robust memory humoral response, CD8+ T-cells, and IgG-mediated phagocytosis by alveolar macrophages. To investigate the role of CD8+ T-cells and alveolar macrophages in the immune memory response to Pneumocystis, mice previously challenged with Pneumocystis were depleted of CD8+ T-cells or alveolar macrophages prior to re-infection. Mice depleted of CD4+ T-cells prior to secondary challenge cleared Pneumocystis infection within 48 h identical to immunocompetent mice during a secondary memory recall response. However, loss of CD8+ T-cells or macrophages prior to the memory recall response significantly impaired Pneumocystis clearance. Specifically, mice depleted of CD8+ T-cells or alveolar macrophages had significantly higher fungal burden in the lungs. Furthermore, loss of alveolar macrophages significantly skewed the lung CD8+ T-cell response toward a terminally differentiated effector memory population and increased the percentage of IFN-γ+ CD8+ T-cells. Finally, Pneumocystis-infected animals produced significantly more bone marrow plasma cells and Pneumocystis-specific IgG significantly increased macrophage-mediated killing of Pneumocystis in vitro. These data suggest that secondary immune memory responses to Pneumocystis are mediated, in part, by CD8+ T-cells, alveolar macrophages, and the production of Pneumocystis-specific IgG.
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Affiliation(s)
- Nicholas M de la Rua
- Section of Pulmonary/Critical Care and Allergy/Immunology, Department of Medicine, Louisiana State University Health Sciences Center , New Orleans, LA , USA
| | - Derrick R Samuelson
- Section of Pulmonary/Critical Care and Allergy/Immunology, Department of Medicine, Louisiana State University Health Sciences Center , New Orleans, LA , USA
| | - Tysheena P Charles
- Section of Pulmonary/Critical Care and Allergy/Immunology, Department of Medicine, Louisiana State University Health Sciences Center , New Orleans, LA , USA
| | - David A Welsh
- Section of Pulmonary/Critical Care and Allergy/Immunology, Department of Medicine, Louisiana State University Health Sciences Center , New Orleans, LA , USA
| | - Judd E Shellito
- Section of Pulmonary/Critical Care and Allergy/Immunology, Department of Medicine, Louisiana State University Health Sciences Center , New Orleans, LA , USA
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