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Pedroso RB, Torres L, Ventura LA, Camatta GC, Mota C, Mendes AC, Ribeiro F, Guimarães HC, Barbuto RC, Caixeta F, Nascimento LS, Oliveira MA, Martins VD, Silveira-Nunes G, Tupinambás U, Teixeira-Carvalho A, Graça L, Faria AMC. Rapid progression of CD8 and CD4 T cells to cellular exhaustion and senescence during SARS-CoV2 infection. J Leukoc Biol 2024:qiae180. [PMID: 39298288 DOI: 10.1093/jleuko/qiae180] [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: 11/24/2023] [Revised: 05/19/2024] [Indexed: 09/21/2024] Open
Abstract
Risk factors for the development of severe COVID-19 include several comorbidities, but age was the most striking one since elderly people were disproportionately affected by SARS-CoV-2 infection. Among the reasons for this markedly unfavorable response in the elderly, immunosenescence and inflammaging appear as major drivers of this outcome. A finding that was also notable was that hospitalized patients with severe COVID-19 have an accumulation of senescent T cells, suggesting that immunosenescence may be aggravated by SARS-CoV-2 infection. The present work was designed to examine whether these immunosenescence changes are characteristic of COVID-19 and whether it is dependent on disease severity using cross-sectional and longitudinal studies. Our cross-sectional data show that COVID-19, but not other respiratory infections, rapidly increased cellular senescence and exhaustion in CD4 and CD8 T cells during early infection. In addition, longitudinal analyses with patients from Brazil and Portugal provided evidence of increased frequencies of senescent and exhausted T cells over a 7-d period in patients with mild/moderate and severe COVID-19. Altogether, the study suggests that accelerated immunosenescence in CD4 and especially CD8 T-cell compartments may represent a common and unique outcome of SARS-CoV2 infection.
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Affiliation(s)
- Rodrigo Balsinha Pedroso
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649, 1649-028, Lisboa, Portugal
| | - Lícia Torres
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Lucas Araújo Ventura
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Giovanna Caliman Camatta
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Catarina Mota
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649, 1649-028, Lisboa, Portugal
| | - Ana Catarina Mendes
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649, 1649-028, Lisboa, Portugal
| | - Filipa Ribeiro
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649, 1649-028, Lisboa, Portugal
| | | | - Rafael Calvão Barbuto
- Hospital Risoleta Tolentino Neves, R. das Gabirobas, 1, 31744-012, Belo Horizonte, MG, Brazil
| | - Felipe Caixeta
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Leandro Souza Nascimento
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Mariana Almeida Oliveira
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Vinícius Dantas Martins
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
| | - Gabriela Silveira-Nunes
- Departamento de Medicina, Universidade Federal de Juiz de Fora (UFJF), Av. Doutor Raimundo Monteiro Resende, Governador Valadares, 35010-177, MG, Brazil
| | - Unaí Tupinambás
- Departamento de Clínica Médica, Faculdade de Medicina, Universidade Federal de Minas Gerais, Av. Alfredo Balena, 190, Belo Horizonte, 30130-100, MG, Brazil
| | - Andrea Teixeira-Carvalho
- Laboratório de Biomarcadores, Instituto de Pesquisa René Rachou, Fundação Oswaldo Cruz, FIOCRUZ-MG, Av. Augusto de Lima, 1715, Belo Horizonte, 30190-002, MG, Brazil
| | - Luis Graça
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649, 1649-028, Lisboa, Portugal
| | - Ana Maria Caetano Faria
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
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Lima-Silva ML, Torres KCL, Mambrini JVDM, Brot NC, Santos SO, Martins-Filho OA, Teixeira-Carvalho A, Lima-Costa MF, Peixoto SV. A nationwide study on immunosenescence biomarkers profile in older adults: ELSI-Brazil. Exp Gerontol 2024; 191:112433. [PMID: 38621429 DOI: 10.1016/j.exger.2024.112433] [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: 01/17/2024] [Revised: 03/19/2024] [Accepted: 04/12/2024] [Indexed: 04/17/2024]
Abstract
Immunosenescence is a phenomenon caused by changes in the immune system, and part of these changes involves an increase in circulating immunological biomarkers, a process known as "Inflammaging." Inflammaging can be associated with many diseases related to older people. As the older population continues to grow, understanding changes in the immune system becomes essential. While prior studies assessing these alterations have been conducted in countries with Caucasian populations, this investigation marks a pioneering effort. The object of the study is to describe for the first time that the distribution of cytokines, chemokines, and growth factors serum levels, assessed by Luminex platform, has been examined in a Brazilian population-based study of older adult females and males by age. Blood samples from 2111 participants (≥50 years old) were analyzed at the baseline (2015/2016) of the ELSI-Brazil study. The exploratory variables considered in the study were age, sex, educational level, residence area, geographic region, alcohol and smoking consumption, physical activity, and self-reported medical diagnoses of hypertension, diabetes, asthma, arthritis, and cancer. The association between serum biomarker levels and age was assessed by a quantile regression model adjusted in the total population and stratified by sex. The significance level considered in the analysis was 0.05. The mean age of the participants was 62.9 years, with a slight majority of female (52.7 %). Differences were found between the sexes in the median circulating levels of the CCL11, CXCL10, and FGF biomarkers. Eight biomarkers showed significant associations with age, including the pro-inflammatory CXCL10, TNF-α, IL-6, IL-17, and IL-2; and type 2/regulatory CCL11 and IL-4, showing positive associations, and anti-inflammatory IL-1Ra showing a negative association. The results suggest similar associations between the sexes, revealing an inflammatory profile characterized by types 1 and 2. Remarkably, these findings reinforce the concept of the Inflammaging process in Brazilian population. These findings add novel insights to about the immunosenescence aspects in middle-income countries and help define biomarkers capable of monitoring inflammation in older adults.
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Affiliation(s)
- Maria Luiza Lima-Silva
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil; Fundação Oswaldo Cruz, Instituto René Rachou, Grupo Integrado de Pesquisas em Biomarcadores, Belo Horizonte, MG, Brazil; Fundação Oswaldo Cruz, Instituto René Rachou, Programa de Pós-Graduação em Saúde Coletiva, Belo Horizonte, MG, Brazil.
| | - Karen Cecília Lima Torres
- Fundação Oswaldo Cruz, Instituto René Rachou, Grupo Integrado de Pesquisas em Biomarcadores, Belo Horizonte, MG, Brazil; Universidade Edson Antônio Velano - UNIFENAS/MG, Brazil.
| | - Juliana Vaz de Melo Mambrini
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil; Fundação Oswaldo Cruz, Instituto René Rachou, Programa de Pós-Graduação em Saúde Coletiva, Belo Horizonte, MG, Brazil
| | - Nathalia Coimbra Brot
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil; Fundação Oswaldo Cruz, Instituto René Rachou, Grupo Integrado de Pesquisas em Biomarcadores, Belo Horizonte, MG, Brazil
| | - Sara Oliveira Santos
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil
| | - Olindo Assis Martins-Filho
- Fundação Oswaldo Cruz, Instituto René Rachou, Grupo Integrado de Pesquisas em Biomarcadores, Belo Horizonte, MG, Brazil; Universidade do Estado do Amazonas - UEA, Brazil
| | - Andréa Teixeira-Carvalho
- Fundação Oswaldo Cruz, Instituto René Rachou, Grupo Integrado de Pesquisas em Biomarcadores, Belo Horizonte, MG, Brazil; Universidade do Estado do Amazonas - UEA, Brazil
| | - Maria Fernanda Lima-Costa
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil
| | - Sérgio Viana Peixoto
- Fundação Oswaldo Cruz, Instituto René Rachou, Núcleo de Estudos em Saúde Pública e Envelhecimento, Belo Horizonte, MG, Brazil; Universidade Federal de Minas Gerais, Escola de Enfermagem, Departamento de Gestão em Saúde, Belo Horizonte, MG, Brazil.
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Quiros-Roldan E, Sottini A, Natali PG, Imberti L. The Impact of Immune System Aging on Infectious Diseases. Microorganisms 2024; 12:775. [PMID: 38674719 PMCID: PMC11051847 DOI: 10.3390/microorganisms12040775] [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: 03/01/2024] [Revised: 03/22/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
Immune system aging is becoming a field of increasing public health interest because of prolonged life expectancy, which is not paralleled by an increase in health expectancy. As age progresses, innate and adaptive immune systems undergo changes, which are defined, respectively, as inflammaging and immune senescence. A wealth of available data demonstrates that these two conditions are closely linked, leading to a greater vulnerability of elderly subjects to viral, bacterial, and opportunistic infections as well as lower post-vaccination protection. To face this novel scenario, an in-depth assessment of the immune players involved in this changing epidemiology is demanded regarding the individual and concerted involvement of immune cells and mediators within endogenous and exogenous factors and co-morbidities. This review provides an overall updated description of the changes affecting the aging immune system, which may be of help in understanding the underlying mechanisms associated with the main age-associated infectious diseases.
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Affiliation(s)
- Eugenia Quiros-Roldan
- Department of Infectious and Tropical Diseases, ASST- Spedali Civili and DSCS- University of Brescia, 25123 Brescia, Italy;
| | - Alessandra Sottini
- Clinical Chemistry Laboratory, Services Department, ASST Spedali Civili of Brescia, 25123 Brescia, Italy;
| | - Pier Giorgio Natali
- Mediterranean Task Force for Cancer Control (MTCC), Via Pizzo Bernina, 14, 00141 Rome, Italy;
| | - Luisa Imberti
- Section of Microbiology, University of Brescia, P. le Spedali Civili, 1, 25123 Brescia, Italy
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Curran D, Doherty TM, Lecrenier N, Breuer T. Healthy ageing: Herpes zoster infection and the role of zoster vaccination. NPJ Vaccines 2023; 8:184. [PMID: 38017011 PMCID: PMC10684688 DOI: 10.1038/s41541-023-00757-0] [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: 06/20/2023] [Accepted: 10/12/2023] [Indexed: 11/30/2023] Open
Abstract
Populations are ageing worldwide, with considerable time lived in ill-health, putting upwards pressure on healthcare budgets. Healthy ageing is defined as maintaining functional ability, including the ability to: meet basic needs; learn, grow and make decisions; be mobile; build and maintain relationships; and contribute to society. The risk and impact of infectious diseases increase with age due to immunosenescence. Vaccination can help to prevent disease in older adults, promoting healthy ageing and active lives. Herpes zoster (HZ) occurs when the varicella zoster virus is reactivated due to declining immunity. HZ is common, with a lifetime risk of one-third, and increases in incidence with age. HZ is associated with severe and intense pain, substantially affecting the functional status of patients as well as their overall health-related quality of life. HZ and its complications may result in prolonged morbidity, including persistent pain (post-herpetic neuralgia, PHN), hearing impairment, vision loss and increased risk of stroke and myocardial infarction. HZ and PHN are difficult to treat, substantiating the benefits of prevention. Vaccines to prevent HZ include a recombinant zoster vaccine (RZV). RZV has shown efficacy against the HZ burden of disease and HZ burden of interference on activities of daily living of over 90% in immunocompetent adults aged ≥50 years. Vaccine efficacy against HZ was maintained at over 70% at 10 years post-vaccination. Adult vaccination, including against HZ, has the potential to reduce burden of disease, thus helping to maintain functioning and quality of life to support healthy ageing in older adults.
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Pojero F, Gervasi F, Fiore SD, Aiello A, Bonacci S, Caldarella R, Attanzio A, Candore G, Caruso C, Ligotti ME, Procopio A, Restivo I, Tesoriere L, Allegra M, Accardi G. Anti-Inflammatory Effects of Nutritionally Relevant Concentrations of Oleuropein and Hydroxytyrosol on Peripheral Blood Mononuclear Cells: An Age-Related Analysis. Int J Mol Sci 2023; 24:11029. [PMID: 37446206 DOI: 10.3390/ijms241311029] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/26/2023] [Accepted: 06/30/2023] [Indexed: 07/15/2023] Open
Abstract
Immunosenescence and inflammaging facilitate the insurgence of chronic diseases. The Mediterranean diet is a non-invasive intervention to improve the chronic low-grade inflammatory status associated with aging. Olive oil oleuropein (OLE) and hydroxytyrosol (HT) demonstrated a controversial modulatory action on inflammation in vitro when tested at concentrations exceeding those detectable in human plasma. We studied the potential anti-inflammatory effects of OLE and HT at nutritionally relevant concentrations on peripheral blood mononuclear cells (PBMCs) as regards cell viability, frequency of leukocyte subsets, and cytokine release, performing an age-focused analysis on two groups of subjects: Adult (age 18-64 years) and Senior (age ≥ 65 years). OLE and HT were used alone or as a pre-treatment before challenging PBMCs with lipopolysaccharide (LPS). Both polyphenols had no effect on cell viability irrespective of LPS, but 5 µM HT had an LPS-like effect on monocytes, reducing the intermediate subset in Adult subjects. OLE and HT had no effect on LPS-triggered release of TNF-α, IL-6 and IL-8, but 5 µM HT reduced IL-10 secretion by PBMCs from Adult vs. Senior group. In summary, nutritionally relevant concentrations of OLE and HT elicit no anti-inflammatory effect and influence the frequency of immune cell subsets with age-related different outcomes.
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Affiliation(s)
- Fanny Pojero
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Francesco Gervasi
- Specialistic Oncology Laboratory Unit, ARNAS Hospitals Civico Di Cristina e Benfratelli, 90127 Palermo, Italy
| | - Salvatore Davide Fiore
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Anna Aiello
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
| | - Sonia Bonacci
- Department of Health Sciences, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Rosalia Caldarella
- Department of Laboratory Medicine, "P. Giaccone" University Hospital, 90127 Palermo, Italy
| | - Alessandro Attanzio
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Giuseppina Candore
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
| | - Calogero Caruso
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
| | - Mattia Emanuela Ligotti
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
| | - Antonio Procopio
- Department of Health Sciences, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Ignazio Restivo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Luisa Tesoriere
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Mario Allegra
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Giulia Accardi
- Laboratory of Immunopathology and Immunosenescence, Department of Biomedicine, Neurosciences and Advanced Technologies, University of Palermo, 90133 Palermo, Italy
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Graca L, Faria AC, Ribeiro RM. Illuminating a blind spot in SARS-CoV-2 immunity. Nat Immunol 2023; 24:889-890. [PMID: 37248418 DOI: 10.1038/s41590-023-01518-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Affiliation(s)
- Luis Graca
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Lisbon Academic Medical Center, Universidade de Lisboa, Lisboa, Portugal.
| | - Ana Caetano Faria
- Departamento de Bioquímica e Imunologia, Insituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Ruy M Ribeiro
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM, USA
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Othman O, Marshall H, Masterson M, Winlow P, Gibson G, Ding Y, Pardon MC. Thymosin beta 4 prevents systemic lipopolysaccharide-induced plaque load in middle-age APP/PS1 mice. Int Immunopharmacol 2023; 117:109951. [PMID: 36878045 DOI: 10.1016/j.intimp.2023.109951] [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: 11/28/2022] [Revised: 02/16/2023] [Accepted: 02/20/2023] [Indexed: 03/07/2023]
Abstract
Lipopolysaccharide (LPS) produced by the gut during systemic infections and inflammation is thought to contribute to Alzheimer's disease (AD) progression. Since thymosin beta 4 (Tβ4) effectively reduces LPS-induced inflammation in sepsis, we tested its potential to alleviate the impact of LPS in the brain of the APPswePS1dE9 mouse model of AD (APP/PS1) and wildtype (WT) mice. 12.5-month-old male APP/PS1 mice (n = 30) and their WT littermates (n = 29) were tested for baseline food burrowing performance, spatial working memory and exploratory drive in the spontaneous alternation and open-field tests, prior to being challenged with LPS (100ug/kg, i.v.) or its vehicle phosphate buffered saline (PBS). Tβ4 (5 mg/kg, i.v.) or PBS, was administered immediately following and at 2 and 4 h after the PBS or LPS challenge, and then once daily for 6 days (n = 7-8). LPS-induced sickness was assessed though monitoring of changes in body weight and behaviour over a 7-day period. Brains were collected for the determination of amyloid plaque load and reactive gliosis in the hippocampus and cortex. Treatment with Tβ4 alleviated sickness symptoms to a greater extent in APP/PS1 than in WT mice by limiting LPS-induced weight loss and inhibition of food burrowing behaviour. It prevented LPS-induced amyloid burden in APP/PS1 mice but increased astrocytic and microglial proliferation in the hippocampus of LPS-treated WT mice. These data show that Tβ4 can alleviate the adverse effects of systemic LPS in the brain by preventing exacerbation of amyloid deposition in AD mice and by inducing reactive microgliosis in aging WT mice.
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Affiliation(s)
- Othman Othman
- School of Life Sciences, Division of Physiology, Pharmacology & Neuroscience, University of Nottingham Medical School, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom
| | - Hayley Marshall
- School of Life Sciences, Division of Physiology, Pharmacology & Neuroscience, University of Nottingham Medical School, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom
| | - Mitchell Masterson
- School of Life Sciences, Division of Physiology, Pharmacology & Neuroscience, University of Nottingham Medical School, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom
| | - Poppy Winlow
- School of Life Sciences, Division of Physiology, Pharmacology & Neuroscience, University of Nottingham Medical School, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom
| | - Graham Gibson
- Nottingham University Hospitals NHS Trust, Department of Histopathology, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom
| | - Yuchun Ding
- School of Computer Sciences, University of Nottingham, Jubilee Campus, Wollaton Road, Nottingham NG8 1BB, United Kingdom
| | - Marie-Christine Pardon
- School of Life Sciences, Division of Physiology, Pharmacology & Neuroscience, University of Nottingham Medical School, Queens Medical Centre, Nottingham NG7 2UH, United Kingdom.
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Fujita K, Ito Y, Yamamoto Y, Kanai O, Imakita T, Oi I, Ito T, Saito Z, Mio T. Comparison of frailty in patients with nontuberculous mycobacterial lung disease and bronchiectasis: a prospective cohort study. BMC Pulm Med 2022; 22:395. [PMID: 36329435 PMCID: PMC9632157 DOI: 10.1186/s12890-022-02206-5] [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: 06/25/2022] [Accepted: 10/25/2022] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The incidence of nontuberculous mycobacterial lung disease (NTM-LD) peaks in middle- and old age groups, coinciding with senescence; thus, chronic infectious diseases can accelerate frailty and worsen mental health in the elderly. In this study, we aimed to compare the prevalence of physical and psychiatric frailty between patients with NTM-LD and bronchiectasis (BE). METHODS The Kihon Checklist Questionnaire (KCQ) was used to assess physical and psychiatric frailties and identify those at risk of requiring care among patients with newly diagnosed NTM-LD and BE. Additionally, the Hospital Anxiety and Depression Scale (HADS) scores and chronic inflammatory biomarkers of the alveolar region (surfactant protein [SP]-A, SP-D, and human cationic antibacterial protein [hCAP]/LL-37) were assessed and compared between NTM-LD and BE patients. RESULTS There were no significant differences in the background characteristics between the 33 NTM and 36 BE patients recruited. The KCQ revealed that the proportion of frail NTM patients at diagnosis was higher than that of frail BE patients (48.5% vs. 22.2%, p = 0.026). HADS scores were significantly higher in the NTM group than in the BE group (p < 0.01). Bronchoalveolar lavage fluid (BALF) hCAP/LL-37 and SP-D levels were significantly higher (p = 0.001), but serum hCAP/LL-37 levels were significantly lower in the NTM group than in the BE group (p = 0.023). However, there were no significant differences in the BALF and serum SP-D levels between the two groups. CONCLUSIONS The number of frail NTM patients at diagnosis was significantly higher than that of frail BE patients. Biomarker analysis suggested that the former had more localized lung inflammation than the latter. TRIAL REGISTRATION This trial was prospectively registered in the Clinical Trials Registry (UMIN 000027652).
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Affiliation(s)
- Kohei Fujita
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan.
| | - Yutaka Ito
- Department of Respiratory Medicine, Allergy and Clinical Immunology, School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Yuki Yamamoto
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan.,HiLung Inc., Kyoto, Japan
| | - Osamu Kanai
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
| | - Takuma Imakita
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
| | - Issei Oi
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
| | - Takanori Ito
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
| | - Zentaro Saito
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
| | - Tadashi Mio
- Division of Respiratory Medicine, Center for Respiratory Diseases, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa-Mukaihata, Fushimi, Kyoto, Japan
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Epigenetic Mechanisms Involved in Inflammaging-Associated Hypertension. Curr Hypertens Rep 2022; 24:547-562. [PMID: 35796869 DOI: 10.1007/s11906-022-01214-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/22/2022] [Indexed: 01/31/2023]
Abstract
PURPOSE OF REVIEW This review summarizes the involvement of inflammaging in vascular damage with focus on the epigenetic mechanisms by which inflammaging-induced hypertension is triggered. RECENT FINDINGS Inflammaging in hypertension is a complex condition associated with the production of inflammatory mediators by the immune cells, enhancement of oxidative stress, and tissue remodeling in vascular smooth muscle cells and endothelial cells. Cellular processes are numerous, including inflammasome assembly and cell senescence which may involve mitochondrial dysfunction, autophagy, DNA damage response, dysbiosis, and many others. More recently, a series of noncoding RNAs, mainly microRNAs, have been described as possessing epigenetic actions on the regulation of inflammasome-related hypertension, emerging as a promising therapeutic strategy. Although there are a variety of pharmacological agents that effectively regulate inflammaging-related hypertension, a deeper understanding of the epigenetic events behind the control of vessel deterioration is needed for the treatment or even to prevent the disease onset.
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Jacob P, Bonnefoy J, Ghislin S, Frippiat JP. Long-duration head-down tilt bed rest confirms the relevance of the neutrophil to lymphocyte ratio and suggests coupling it with the platelet to lymphocyte ratio to monitor the immune health of astronauts. Front Immunol 2022; 13:952928. [PMID: 36311805 PMCID: PMC9606754 DOI: 10.3389/fimmu.2022.952928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/29/2022] [Indexed: 11/23/2022] Open
Abstract
The identification of safe and easily-determined-inflight biomarkers to monitor the immune system of astronauts is mandatory to ensure their well-being and the success of the missions. In this report, we evaluated the relevance of two biomarkers whose determination could be easily implemented in a spacecraft in the near future by using bedridden volunteers as a ground-based model of the microgravity of spaceflight. Our data confirm the relevance of the neutrophil to lymphocyte ratio (NLR) and suggest platelet to lymphocyte ratio (PLR) monitoring to assess long-lasting immune diseases. We recommend coupling these ratios to other biomarkers, such as the quantification of cytokines and viral load measurements, to efficiently detect immune dysfunction, determine when countermeasures should be applied to promote immune recovery, prevent the development of disease, and track responses to treatment.
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Affiliation(s)
- Pauline Jacob
- Stress Immunity Pathogens Laboratory, UR 7300 SIMPA, Faculty of Medicine, Université de Lorraine, Vandœuvre-lès-Nancy, France
| | - Julie Bonnefoy
- Stress Immunity Pathogens Laboratory, UR 7300 SIMPA, Faculty of Medicine, Université de Lorraine, Vandœuvre-lès-Nancy, France
| | - Stéphanie Ghislin
- Stress Immunity Pathogens Laboratory, UR 7300 SIMPA, Faculty of Medicine, Université de Lorraine, Vandœuvre-lès-Nancy, France
| | - Jean-Pol Frippiat
- Stress Immunity Pathogens Laboratory, UR 7300 SIMPA, Faculty of Medicine, Université de Lorraine, Vandœuvre-lès-Nancy, France
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11
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Munteanu AN, Surcel M, Isvoranu G, Constantin C, Neagu M. Healthy Ageing Reflected in Innate and Adaptive Immune Parameters. Clin Interv Aging 2022; 17:1513-1526. [PMID: 36247200 PMCID: PMC9555218 DOI: 10.2147/cia.s375926] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 09/06/2022] [Indexed: 11/23/2022] Open
Abstract
Purpose The aim of the paper is to establish and quantify the relation between healthy ageing and the innate and adaptive immune parameters as indicators of age-related diseases. Patients In order to observe the immunological changes that occur according to age, several humoral and cellular immune parameters were investigated for 288 healthy donors (30-80 years). Subjects' selection was done using clinical, biochemical and immunological parameters of inclusion/exclusion criteria from SENIEUR protocol. Results Age-related changes were observed for both humoral and cellular immune parameters. Lymphocyte immunophenotyping revealed several significant differences in the distribution of cells, both intra- and inter-age groups, namely decreased values of T-CD3+, T-CD8+ and NK cells, and elevated values for T-CD4+, T-CD4+/T-CD8+ ratio and B cells. The percentages of unstimulated neutrophils that show basal oxidative activity and the intensity of this activity had an increasing tendency age-related. The percentage of N-Formyl-Methionyl-Leucyl-Phenylalanine stimulated neutrophils clearly decreases with age, and is associated with an increasing intensity of oxidative activity. Our data also have shown an increased percentage of oxidative neutrophils after phorbol 12-myristate 13-acetate stimulation and an elevated oxidative activity with age. Conclusion Overall healthy ageing is governed by some immune-related deregulations that account for immune exhaustion due to numerous developed immune processes during a life-time and the age-related diseases.
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Affiliation(s)
- Adriana Narcisa Munteanu
- Immunology Laboratory, Victor Babes National Institute of Pathology, Bucharest, 050096, Romania,Doctoral School of Biology, Faculty of Biology, University of Bucharest, Bucharest, 050095, Romania
| | - Mihaela Surcel
- Immunology Laboratory, Victor Babes National Institute of Pathology, Bucharest, 050096, Romania
| | - Gheorghița Isvoranu
- Immunology Laboratory, Victor Babes National Institute of Pathology, Bucharest, 050096, Romania
| | - Carolina Constantin
- Immunology Laboratory, Victor Babes National Institute of Pathology, Bucharest, 050096, Romania,Department of Pathology, Colentina University Hospital, Bucharest, 020125, Romania
| | - Monica Neagu
- Immunology Laboratory, Victor Babes National Institute of Pathology, Bucharest, 050096, Romania,Doctoral School of Biology, Faculty of Biology, University of Bucharest, Bucharest, 050095, Romania,Department of Pathology, Colentina University Hospital, Bucharest, 020125, Romania,Correspondence: Monica Neagu, Immunology Laboratory, Victor Babes National Institute of Pathology, 99-101 Splaiul Independentei, Bucharest, 050096, Romania, Tel/Fax +4021-3194528, Email
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12
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Govoni S, Fagiani F, Lanni C, Allegri N. The Frailty Puzzle: Searching for Immortality or for Knowledge Survival? Front Cell Neurosci 2022; 16:838447. [PMID: 35250489 PMCID: PMC8891148 DOI: 10.3389/fncel.2022.838447] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 01/25/2022] [Indexed: 12/18/2022] Open
Abstract
What is the value of assessing the biological age and frailty and predicting residual lifespan and health status? The benefit is obvious if we have means to alter the pace of aging and the development of frailty. So far, limited but increasing examples of interventions altering the predicted status indicate that, at least in some cases, this is possible through interventions spanning from the economic-social through drug treatments. Thus, why searching for biological markers, when some clinical and socio-economic indicators do already provide sufficiently accurate predictions? Indeed, the search of frailty biomarkers and of their biological clocks helps to build up a mechanistic frame that may orientate the design of interventions and the time window of their efficacy. Among the candidate biomarkers identified, several studies converge to indicate epigenetic clocks as a promising sensitive biomarker of the aging process. Moreover, it will help to establish the relationship between personal aging and health trajectories and to individuate the check points beyond which biological changes are irreversible.
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Affiliation(s)
- Stefano Govoni
- Department of Drug Sciences (Pharmacology Section), University of Pavia, Pavia, Italy
- CEFAT (Center of Pharmaceuticals Economics and Medical Technologies Evaluation), University of Pavia, Pavia, Italy
| | - Francesca Fagiani
- Department of Drug Sciences (Pharmacology Section), University of Pavia, Pavia, Italy
| | - Cristina Lanni
- Department of Drug Sciences (Pharmacology Section), University of Pavia, Pavia, Italy
| | - Nicola Allegri
- CEFAT (Center of Pharmaceuticals Economics and Medical Technologies Evaluation), University of Pavia, Pavia, Italy
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13
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Santoro A, Bientinesi E, Monti D. Immunosenescence and inflammaging in the aging process: age-related diseases or longevity? Ageing Res Rev 2021; 71:101422. [PMID: 34391943 DOI: 10.1016/j.arr.2021.101422] [Citation(s) in RCA: 177] [Impact Index Per Article: 59.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 08/01/2021] [Accepted: 08/03/2021] [Indexed: 12/12/2022]
Abstract
During aging the immune system (IS) undergoes remarkable changes that collectively are known as immunosenescence. It is a multifactorial and dynamic phenomenon that affects both natural and acquired immunity and plays a critical role in most chronic diseases in older people. For a long time, immunosenescence has been considered detrimental because it may lead to a low-grade, sterile chronic inflammation we proposed to call "inflammaging" and a progressive reduction in the ability to trigger effective antibody and cellular responses against infections and vaccinations. Recently, many scientists revised this negative meaning because it can be considered an essential adaptation/remodeling resulting from the lifelong immunological biography of single individuals from an evolutionary perspective. Inflammaging can be considered an adaptive process because it can trigger an anti-inflammatory response to counteract the age-related pro-inflammatory environment. Centenarians represent a valuable model to study the beneficial changes occurring in the IS with age. These extraordinary individuals reached the extreme limits of human life by slowing down the aging process and, in most cases, delaying, avoiding or surviving the major age-associated diseases. They indeed show a complex and heterogeneous phenotype determined by an improved ability to adapt and remodel in response to harmful stimuli. This review aims to point out the intimate relationship between immunosenescence and inflammaging and how these processes impact unsuccessful aging rather than longevity. We also describe the gut microbiota age-related changes as one of the significant triggers of inflammaging and the sex/gender differences in the immune system of the elderly, contributing to the sex/gender disparity in terms of epidemiology, pathophysiology, symptoms and severity of age-related diseases. Finally, we discuss how these phenomena could influence the susceptibility to COVID-19 infection.
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14
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Community-acquired pneumonia in infants: Not simply an acute event with complete recovery. Respir Med 2021; 191:106671. [PMID: 34864372 DOI: 10.1016/j.rmed.2021.106671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/15/2021] [Accepted: 10/22/2021] [Indexed: 11/21/2022]
Abstract
BACKGROUND Pneumonia in infancy has been linked to long-term consequences for the rapidly developing lung. We examined the impact of hospitalized community-acquired pneumonia (CAP) on subsequent respiratory health. METHODS We conducted a retrospective matched-cohort study using the Optum® de-identified Electronic Health Record Dataset (2009-2018). Study population comprised healthy infants hospitalized for CAP ("CAP patients"), and matched comparators without pneumonia ("comparison patients"), before age 2 years. Study outcomes included any chronic respiratory disorder, reactive airway disease (asthma, hyperactive airway disease, recurrent wheezing), and CAP hospitalization occurring between age 2-5 years, and were evaluated overall as well as by age and etiology at first CAP hospitalization. RESULTS Study population totaled 1,343 CAP patients and 6,715 comparison patients. Rates per 100 patient-years and relative rates (RR) of study outcomes from age 2-5 years for CAP patients versus comparison patients were: any chronic respiratory disorder, 11.6 vs. 4.9 (RR = 2.4 [95% CI: 2.1-2.6]); reactive airway disease, 6.1 vs 1.9 (RR = 3.2 [2.6-3.8]); and CAP hospitalization, 1.0 vs 0.2 (RR = 6.3 [3.6-10.9]). Rates of study outcomes were highest among CAP patients who had their initial hospitalization in the second year of life. CONCLUSIONS Infant CAP foreshadows an increased risk of subsequent chronic respiratory disorders, which may be elevated when CAP occurs closer to pre-school age (i.e., age 2-5 years). These findings are most consistent with the hypothesis that inflammation persists beyond the acute stage of pneumonia and plays a role in the development of chronic respiratory sequelae.
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15
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Shao T, Verma HK, Pande B, Costanzo V, Ye W, Cai Y, Bhaskar LVKS. Physical Activity and Nutritional Influence on Immune Function: An Important Strategy to Improve Immunity and Health Status. Front Physiol 2021; 12:751374. [PMID: 34690818 PMCID: PMC8531728 DOI: 10.3389/fphys.2021.751374] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 09/13/2021] [Indexed: 12/11/2022] Open
Abstract
Physical activity (PA) and nutrition are the essential components of a healthy lifestyle, as they can influence energy balance, promote functional ability of various systems and improve immunity. Infections and their associated symptoms are the common and frequent challenges to human health that are causing severe economic and social consequences around the world. During aging, human immune system undergoes dramatic aging-related changes/dysfunctions known as immunosenescence. Clinically, immunosenescence refers to the gradual deterioration of immune system that increases exposure to infections, and reduces vaccine efficacy. Such phenomenon is linked to impaired immune responses that lead to dysfunction of multiple organs, while lack of physical activity, progressive loss of muscle mass, and concomitant decline in muscle strength facilitate immunosenescence and inflammation. In the present review, we have discussed the role of nutrition and PA, which can boost the immune system alone and synergistically. Evidence suggests that long-term PA is beneficial in improving immune system and preventing various infections. We have further discussed several nutritional strategies for improving the immune system. Unfortunately, the available evidence shows conflicting results. In terms of interaction with food intake, PA does not tend to increase energy intake during a short time course. However, overcoming nutritional deficiencies appears to be the most practical recommendation. Through the balanced nutritious diet intake one can fulfill the bodily requirement of optimal nutrition that significantly impacts the immune system. Supplementation of a single nutrient as food is generally not advisable. Rather incorporating various fruits and vegetables, whole grains, proteins and probiotics may ensure adequate nutrient intake. Therefore, multi-nutrient supplements may benefit people having deficiency in spite of sufficient diet. Along with PA, supplementation of probiotics, bovine colostrum, plant-derived products and functional foods may provide additional benefits in improving the immune system.
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Affiliation(s)
- Tianyi Shao
- College of Teacher Education, Zhejiang Normal University, Jinhua, China
| | - Henu Kumar Verma
- Department of Immunopathology, Institute of lungs Biology and Disease, Comprehensive Pneumology Center, Helmholtz Zentrum, Munich, Germany
| | - Babita Pande
- Department of Physiology, All India Institute of Medical Science, Raipur, India
| | - Vincenzo Costanzo
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Weibing Ye
- College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, China
| | - Yuyan Cai
- Department of Physical Education, Guangdong University of Technology, Guangzhou, China
| | - L V K S Bhaskar
- Department of Zoology, Guru Ghasidas Vishwavidyalaya, Bilaspur, India
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16
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Pinheiro-Rosa N, Torres L, Oliveira MDA, Andrade-Oliveira MF, Guimarães MADF, Coelho MM, Alves JDL, Maioli TU, Faria AMC. Oral tolerance as antigen-specific immunotherapy. IMMUNOTHERAPY ADVANCES 2021; 1:ltab017. [PMID: 35919733 PMCID: PMC9327124 DOI: 10.1093/immadv/ltab017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 07/23/2021] [Accepted: 08/23/2021] [Indexed: 12/19/2022] Open
Abstract
Summary
Oral tolerance is a physiological phenomenon described more than a century ago as a suppressive immune response to antigens that gain access to the body by the oral route. It is a robust and long-lasting event with local and systemic effects in which the generation of mucosally induced regulatory T cells (iTreg) plays an essential role. The idea of using oral tolerance to inhibit autoimmune and allergic diseases by oral administration of target antigens was an important development that was successfully tested in 1980s. Since then, several studies have shown that feeding specific antigens can be used to prevent and control chronic inflammatory diseases in both animal models and clinically. Therefore, oral tolerance can be classified as an antigen-specific form of oral immunotherapy (OIT). In the light of novel findings on mechanisms, sites of induction and factors affecting oral tolerance, this review will focus on specific characteristics of oral tolerance induction and how they impact in its therapeutic application.
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Affiliation(s)
- Natália Pinheiro-Rosa
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Lícia Torres
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Mariana de Almeida Oliveira
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Marcos Felipe Andrade-Oliveira
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Mauro Andrade de Freitas Guimarães
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Monique Macedo Coelho
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Juliana de Lima Alves
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Tatiani Uceli Maioli
- Departamento de Nutrição, Escola de Enfermagem, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Ana M Caetano Faria
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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17
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Muscat SM, Barrientos RM. The Perfect Cytokine Storm: How Peripheral Immune Challenges Impact Brain Plasticity & Memory Function in Aging. Brain Plast 2021; 7:47-60. [PMID: 34631420 PMCID: PMC8461734 DOI: 10.3233/bpl-210127] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Precipitous declines in cognitive function can occur in older individuals following a variety of peripheral immune insults, such as surgery, infection, injury, and unhealthy diet. Aging is associated with numerous changes to the immune system that shed some light on why this abrupt cognitive deterioration may occur. Normally, peripheral-to-brain immune signaling is tightly regulated and advantageous; communication between the two systems is bi-directional, via either humoral or neural routes. Following an immune challenge, production, secretion, and translocation of cytokines into the brain is critical to the development of adaptive sickness behaviors. However, aging is normally associated with neuroinflammatory priming, notably microglial sensitization. Microglia are the brain's innate immune cells and become sensitized with advanced age, such that upon immune stimulation they will mount more exaggerated neuroimmune responses. The resultant elevation of pro-inflammatory cytokine expression, namely IL-1β, has profound effects on synaptic plasticity and, consequentially, cognition. In this review, we (1) investigate the processes which lead to aberrantly elevated inflammatory cytokine expression in the aged brain and (2) examine the impact of the pro-inflammatory cytokine IL-1β on brain plasticity mechanisms, including its effects on BDNF, AMPA and NMDA receptor-mediated long-term potentiation.
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Affiliation(s)
- Stephanie M Muscat
- Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA
- Biomedical Sciences Graduate Program, The Ohio State University, Columbus, OH, USA
| | - Ruth M Barrientos
- Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA
- Department of Psychiatry and Behavioral Health, The Ohio State University, Columbus, OH, USA
- Department of Neuroscience, The Ohio State University, Columbus, OH, USA
- Chronic Brain Injury Program, Discovery Themes Initiative, The Ohio State University, Columbus, OH, USA
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