1
|
Rodriguez NR, Fortune T, Hegde E, Weinstein MP, Keane AM, Mangold JF, Swartz TH. Oxidative phosphorylation in HIV-1 infection: impacts on cellular metabolism and immune function. Front Immunol 2024; 15:1360342. [PMID: 38529284 PMCID: PMC10962326 DOI: 10.3389/fimmu.2024.1360342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/26/2024] [Indexed: 03/27/2024] Open
Abstract
Human Immunodeficiency Virus Type 1 (HIV-1) presents significant challenges to the immune system, predominantly characterized by CD4+ T cell depletion, leading to Acquired Immunodeficiency Syndrome (AIDS). Antiretroviral therapy (ART) effectively suppresses the viral load in people with HIV (PWH), leading to a state of chronic infection that is associated with inflammation. This review explores the complex relationship between oxidative phosphorylation, a crucial metabolic pathway for cellular energy production, and HIV-1, emphasizing the dual impact of HIV-1 infection and the metabolic and mitochondrial effects of ART. The review highlights how HIV-1 infection disrupts oxidative phosphorylation, promoting glycolysis and fatty acid synthesis to facilitate viral replication. ART can exacerbate metabolic dysregulation despite controlling viral replication, impacting mitochondrial DNA synthesis and enhancing reactive oxygen species production. These effects collectively contribute to significant changes in oxidative phosphorylation, influencing immune cell metabolism and function. Adenosine triphosphate (ATP) generated through oxidative phosphorylation can influence the metabolic landscape of infected cells through ATP-detected purinergic signaling and contributes to immunometabolic dysfunction. Future research should focus on identifying specific targets within this pathway and exploring the role of purinergic signaling in HIV-1 pathogenesis to enhance HIV-1 treatment modalities, addressing both viral infection and its metabolic consequences.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Talia H. Swartz
- Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| |
Collapse
|
2
|
Thymic Exhaustion and Increased Immune Activation Are the Main Mechanisms Involved in Impaired Immunological Recovery of HIV-Positive Patients under ART. Viruses 2023; 15:v15020440. [PMID: 36851655 PMCID: PMC9961132 DOI: 10.3390/v15020440] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/22/2023] [Accepted: 02/03/2023] [Indexed: 02/08/2023] Open
Abstract
Decades of studies in antiretroviral therapy (ART) have passed, and the mechanisms that determine impaired immunological recovery in HIV-positive patients receiving ART have not been completely elucidated yet. Thus, T-lymphocytes immunophenotyping and cytokines levels were analyzed in 44 ART-treated HIV-positive patients who had a prolonged undetectable plasma viral load. The patients were classified as immunological non-responders (INR = 13) and immunological responders (IR = 31), according to their CD4+ T cell levels. Evaluating pre-CD4+ levels, we observed a statistically significant trend between lower CD4+ T cell levels and INR status (Z = 3.486, p < 0.001), and during 18 months of ART, the CD4+ T cell levels maintained statistical differences between the INR and IR groups (WTS = 37.252, p < 0.001). Furthermore, the INRs were associated with an elevated age at ART start; a lower pre-treatment CD4+ T cell count and a percentage that remained low even after 18 months of ART; lower levels of recent thymic emigrant (RTE) CD4+ T cell (CD45RA + CD31+) and a naïve CD4+ T cell (CD45RA + CD62L+); higher levels of central memory CD4+ T cells (CD45RA-CD62L+); and higher immune activation by CD4+ expressing HLA-DR+ or both (HLA-DR+ and CD38+) when compared with IRs. Our study demonstrates that thymic exhaustion and increased immune activation are two mechanisms substantially implicated in the impaired immune recovery of ART-treated HIV patients.
Collapse
|
3
|
Mazzuti L, Turriziani O, Mezzaroma I. The Many Faces of Immune Activation in HIV-1 Infection: A Multifactorial Interconnection. Biomedicines 2023; 11:biomedicines11010159. [PMID: 36672667 PMCID: PMC9856151 DOI: 10.3390/biomedicines11010159] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/02/2023] [Accepted: 01/06/2023] [Indexed: 01/10/2023] Open
Abstract
Chronic immune activation has a significant role in HIV-1 disease pathogenesis and CD4+ T-cell depletion. The causes of chronic inflammation and immune activation are incompletely understood, but they are likely multifactorial in nature, involving both direct and indirect stimuli. Possible explanations include microbial translocation, coinfection, and continued presence of competent replicating virus. In fact, long-term viral suppression treatments are unable to normalize elevated markers of systemic immune activation. Furthermore, high levels of pro-inflammatory cytokines increase susceptibility to premature aging of the immune system. The phenomenon of "inflammaging" has begun to be evident in the last decades, as a consequence of increased life expectancy due to the introduction of cART. Quality of life and survival have improved substantially; however, PLWH are predisposed to chronic inflammatory conditions leading to age-associated diseases, such as inflammatory bowel disease, neurocognitive disorders, cardiovascular diseases, metabolic syndrome, bone abnormalities, and non-HIV-associated cancers. Several approaches have been studied in numerous uncontrolled and/or randomized clinical trials with the aim of reducing immune activation/inflammatory status in PLWH, none of which have achieved consistent results.
Collapse
Affiliation(s)
- Laura Mazzuti
- Department of Clinical and Molecular Medicine, Sapienza University of Rome, 00185 Rome, Italy
| | - Ombretta Turriziani
- Laboratory of Virology, Department of Molecular Medicine, Sapienza University of Rome, 00185 Rome, Italy
| | - Ivano Mezzaroma
- Department of Translational and Precision Medicine, Sapienza University of Rome, 00185 Rome, Italy
- Correspondence:
| |
Collapse
|
4
|
Li B, Zhang L, Liu Y, Xiao J, Li C, Fan L, Duan Y, Xiao J, Hao Y, Han J, Kong Y, Zhao H. A novel prediction model to evaluate the probability of CD4+/CD8+ cell ratio restoration in HIV-infected individuals. AIDS 2022; 36:795-804. [PMID: 35013083 DOI: 10.1097/qad.0000000000003167] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Our study aimed to develop a clinical prediction model to evaluate the possibility of CD4+/CD8+ ratio restoration in HIV-positive individuals. METHODS About 1980, HIV/AIDS patients initiated with antiretroviral treatment from 1 January 2013, to 30 December 2016, at Beijing Ditan Hospital and achieved persistent virological suppression during the 4 years follow-up were included in this study. Multivariate Cox proportional regression analysis was used to identify the independent risk factors and establish a predictive model. The model's performance was assessed using the area under the receiver operating characteristic and calibration plots. RESULTS Overall, after 4 years of treatment, a total of 455 individuals (22.98%) restored their CD4+/CD8+ ratio (≥1). The area under the receiver operating characteristic was 0.782 and 0.743 in the deriving and validation cohort, respectively. The ultimate model included five indexes: age at AIDS diagnosis, albumin, and syphilis status, and baseline CD4+ and CD8+ values. A nomogram further visualized the model, and the calibration plots indicated high agreement of predicted and observed outcomes. CONCLUSION Our prediction model might be practical and easily applied to recognize HIV/AIDS individuals most likely to benefit from modern antiretroviral therapy.
Collapse
Affiliation(s)
- Bei Li
- Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University
| | - Leidan Zhang
- Department of Infection, Beijing Ditan Hospital, Peking University, Beijing
| | - Ying Liu
- Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University
| | - Jing Xiao
- Department of Infection, Beijing Ditan Hospital, Peking University, Beijing
| | - Cuilin Li
- Department of Infection, Beijing Ditan Hospital, Peking University, Beijing
| | - Lina Fan
- Department of Infectious Disease, The Tianjin Second People's Hospital, Tianjin
| | - Yujiao Duan
- Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University
| | - Jiang Xiao
- Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University
| | - Yu Hao
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Junyan Han
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Yaxian Kong
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Hongxin Zhao
- Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University
| |
Collapse
|
5
|
Salva S, Kolling Y, Ivir M, Gutiérrez F, Alvarez S. The Role of Immunobiotics and Postbiotics in the Recovery of Immune Cell Populations From Respiratory Mucosa of Malnourished Hosts: Effect on the Resistance Against Respiratory Infections. Front Nutr 2021; 8:704868. [PMID: 34458307 PMCID: PMC8387655 DOI: 10.3389/fnut.2021.704868] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/19/2021] [Indexed: 12/14/2022] Open
Abstract
Malnutrition is associated with a state of secondary immunodeficiency, which is characterized by a worsening of the immune response against infectious agents. Despite important advances in vaccines and antibiotic therapies, the respiratory infections are among the leading causes of increased morbidity and mortality, especially in immunosuppressed hosts. In this review, we examine the interactions between immunobiotics-postbiotics and the immune cell populations of the respiratory mucosa. In addition, we discuss how this cross talk affects the maintenance of a normal generation of immune cells, that is crucial for the establishment of protective innate and adaptive immune responses. Particular attention will be given to the alterations in the development of phagocytic cells, T and B lymphocytes in bone marrow, spleen and thymus in immunosuppression state by protein deprivation. Furthermore, we describe our research that demonstrated that the effectiveness of immunobiotics nasal administration in accelerating the recovery of the respiratory immune response in malnourished hosts. Finally, we propose the peptidoglycan from the immunobiotic Lactobacillus rhamnosus CRL1505 as the key cellular component for the effects on mucosal immunity, which are unique and cannot be extrapolated to other L. rhamnosus or probiotic strains. In this way, we provide the scientific bases for its application as a mucosal adjuvant in health plans, mainly aimed to improve the immune response of immunocompromised hosts. The search for safe vaccine adjuvants that increase their effectiveness at the mucosal level is a problem of great scientific relevance today.
Collapse
Affiliation(s)
- Susana Salva
- Laboratory of Immunobiotechnology, Reference Centre for Lactobacilli Centro de Referencia para Lactobacilos-Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), San Miguel de Tucuman, Argentina
| | - Yanina Kolling
- Laboratory of Immunobiotechnology, Reference Centre for Lactobacilli Centro de Referencia para Lactobacilos-Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), San Miguel de Tucuman, Argentina
| | - Maximiliano Ivir
- Laboratory of Immunobiotechnology, Reference Centre for Lactobacilli Centro de Referencia para Lactobacilos-Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), San Miguel de Tucuman, Argentina
| | - Florencia Gutiérrez
- Laboratory of Immunobiotechnology, Reference Centre for Lactobacilli Centro de Referencia para Lactobacilos-Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), San Miguel de Tucuman, Argentina
| | - Susana Alvarez
- Laboratory of Immunobiotechnology, Reference Centre for Lactobacilli Centro de Referencia para Lactobacilos-Consejo Nacional de Investigaciones Científicas y Técnicas (CERELA-CONICET), San Miguel de Tucuman, Argentina.,Clinical Biochemistry I, Institute of Applied Biochemistry, National University of Tucuman, San Miguel de Tucuman, Argentina
| |
Collapse
|
6
|
Okedoye A, Salawu S, Oke S, Oladejo N. Mathematical analysis of affinity hemodialysis on T-Cell depletion. SCIENTIFIC AFRICAN 2020. [DOI: 10.1016/j.sciaf.2020.e00427] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
7
|
Mboumba Bouassa RS, Pere H, Mossoro-Kpinde CD, Roques P, Gody JC, Moussa S, Veyer D, Gresenguet G, Charpentier C, Jenabian MA, Djoba Siawaya JF, Belec L. Purifying Selection in Human Immunodeficiency Virus-1 pol Gene in Perinatally Human Immunodeficiency Virus-1-Infected Children Harboring Discordant Immunological Response and Virological Nonresponse to Long-Term Antiretroviral Therapy. J Clin Med Res 2020; 12:369-376. [PMID: 32587653 PMCID: PMC7295550 DOI: 10.14740/jocmr4157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/23/2020] [Indexed: 11/11/2022] Open
Abstract
Background Biological monitoring of antiretroviral treatment (ART) in human immunodeficiency virus (HIV)-infected pediatric population remains challenging. The aim of the present study was to assess the long-term HIV-1 genetic diversity in pol gene in HIV-1-infected children in virological failure under antiretroviral regimen adapted according to the successive World Health Organization (WHO) guidelines for resource-constrained settings. Methods HIV-1 diversity in pol gene was assessed in HIV-1-infected children and adolescents born from HIV-infected mothers (median age at follow-up: 13.8 years) in virological failure (VF+) despite long-term regimen recommended by the WHO. The numbers of nonsynonymous substitutions per potential nonsynonymous site (dN) and of synonymous substitutions at potential synonymous sites (dS) in HIV-1 pol gene and the dN/dS ratios were used to estimate the selective pressure on circulating HIV-1. Results The immunological responses to ART basically corresponded to: 1) Full therapeutic failure with immunological (I-) and virological nonresponses in one-quarter (24.6%) of study children ((I-, VF+) subgroup); 2) Discordant immunovirological responses with paradoxical high CD4 T cell counts (I+) and high HIV-1 RNA load in the remaining cohort patients (75.4%) ((I+, VF+) subgroup). The mean dS was 1.8-fold higher in (I+, VF+) than (I-, VF+) subgroup (25.9 ± 18.4 vs. 14.3 ± 10.8). In the (I+, VF+) subgroup, the mean dS was 1.6-fold higher than the mean dN. Finally, the mean dN/dS ratio was 2.1-fold lower in (I+, VF+) than (I-, VF+) subgroup (0.6 ± 0.3 vs. 1.3 ± 0.7), indicating purifying selection in the immunovirological discordant (I+, VF+) subgroup and positive selection in the immunovirological failure (I-, VF+) subgroup. Conclusions Children and adolescents in immunovirological therapeutic failure harbor positive selection of HIV-1 strains favoring diversifying in pol-encoded amino acids. In contrast, children with persistent discordant immunovirological responses show accumulation of mutations and purifying selection in pol gene sequences, indicating limited genetic evolution and likely suggesting genetic adaptation of viruses to host functional constraints.
Collapse
Affiliation(s)
- Ralph-Sydney Mboumba Bouassa
- Laboratoire de Virologie, Hopital Europeen Georges Pompidou, Assistance Publique-Hopitaux de Paris (AP-HP) and Universite de Paris, Paris Sorbonne Cite, Paris, France.,Ecole Doctorale Regionale en Infectiologie Tropicale, Franceville, Gabon
| | - Helene Pere
- Laboratoire de Virologie, Hopital Europeen Georges Pompidou, Assistance Publique-Hopitaux de Paris (AP-HP) and Universite de Paris, Paris Sorbonne Cite, Paris, France.,Universite de Paris, Paris Sorbonne Cite, Paris, France
| | - Christian Diamant Mossoro-Kpinde
- Faculte des Sciences de la Sante, Universite de Bangui, Bangui, Central African Republic.,Laboratoire National de Biologie Clinique et de Sante Publique, Bangui, Central African Republic
| | - Pierre Roques
- Commissariat a l'Energie Atomique (CEA)-Universite Paris-Saclay; INSERM U1184, Immunology of Viral Infections and Autoimmune Diseases (IMVA), IDMIT Department, Institut de Biologie Francois-Jacob (IBJF), Fontenay-aux-Roses, France
| | - Jean Chrysostome Gody
- Faculte des Sciences de la Sante, Universite de Bangui, Bangui, Central African Republic.,Complexe Pediatrique, Bangui, Central African Republic
| | - Sandrine Moussa
- Institut Pasteur de Bangui, Bangui, Central African Republic
| | - David Veyer
- Laboratoire de Virologie, Hopital Europeen Georges Pompidou, Assistance Publique-Hopitaux de Paris (AP-HP) and Universite de Paris, Paris Sorbonne Cite, Paris, France
| | - Gerard Gresenguet
- Faculte des Sciences de la Sante, Universite de Bangui, Bangui, Central African Republic.,Unite de Recherches et d'Intervention sur les Maladies Sexuellement Transmissibles et le SIDA, Departement de Sante Publique, Faculte des Sciences de la Sante de Bangui, Central African Republic
| | - Charlotte Charpentier
- IAME, UMR 1137, INSERM, Universite Paris Diderot, Sorbonne Paris Cite, AP-HP, Laboratoire de Virologie, Hopital Bichat, AP-HP, Paris, France
| | - Mohammad-Ali Jenabian
- Departement des Sciences Biologiques et Centre de Recherche BioMed, Universite du Quebec a Montreal (UQAM), Montreal, QC, Canada
| | - Joel Fleury Djoba Siawaya
- Ecole Doctorale Regionale en Infectiologie Tropicale, Franceville, Gabon.,Laboratory Medicine, Mother and Child University Hospital Jeanne Ebori, Libreville, Gabon
| | - Laurent Belec
- Laboratoire de Virologie, Hopital Europeen Georges Pompidou, Assistance Publique-Hopitaux de Paris (AP-HP) and Universite de Paris, Paris Sorbonne Cite, Paris, France.,Ecole Doctorale Regionale en Infectiologie Tropicale, Franceville, Gabon.,Universite de Paris, Paris Sorbonne Cite, Paris, France
| |
Collapse
|
8
|
Mossoro-Kpinde CD, Gody JC, Mboumba Bouassa RS, Moussa S, Jenabian MA, Péré H, Charpentier C, Matta M, Longo JDD, Grésenguet G, Djoba Siawaya JF, Bélec L. Escalating and sustained immunovirological dissociation among antiretroviral drug-experienced perinatally human immunodeficiency virus-1-infected children and adolescents living in the Central African Republic: A STROBE-compliant study. Medicine (Baltimore) 2020; 99:e19978. [PMID: 32481261 PMCID: PMC7249904 DOI: 10.1097/md.0000000000019978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Sub-Saharan Africa has the vast majority (∼90%) of new pediatric acquired immunodeficiency syndrome cases worldwide. Biologically monitoring HIV-infected pediatric populations remains challenging. The differential interest of human immunodeficiency virus (HIV)-1 RNA loads and CD4 T-cell counts is debated for the treatment of pediatric acquired immunodeficiency syndrome patients.Long-term antiretroviral treatment (ART) outcomes regarding immunological and virological surrogate markers were longitudinally evaluated between 2009 and 2014 (over 57 months) in 245 perinatally HIV-1-infected children and adolescents born from HIV-infected mothers, treated at inclusion for at least 6 months by the World Health Organization-recommended ART in Bangui, Central African Republic.Patients were monitored over time biologically for CD4 T-cell counts, HIV-1 RNA loads, and drug resistance mutation genotyping.Children lost to follow-up totaled 6%. Four categories of immunovirological responses to ART were observed. At baseline, therapeutic success with sustained immunological and virological responses was observed in 80 (32.6%) children; immunological and virologic nonresponses occurred in 32 (13.0%) children; finally, the majority (133; 54.2%) of the remaining children showed discordant immunovirological responses. Among them, 33 (13.4%) children showed rapid virological responses to ART with an undetectable viral load, whereas immunological responses remained absent after 6 months of treatment and increased progressively over time in most of the cases, suggesting slow immunorestoration. Notably, nearly half of the children (40.8% at baseline and 48.2% at follow-up) harbored discordant immunovirological responses with a paradoxically high CD4 T-cell count and HIV-1 RNA load, which are always associated with high levels of drug resistance mutations. The latter category showed a significant increase over time, with a growth rate of 1.23% per year of follow-up.Our STROBE-compliant study demonstrates the high heterogeneity of biological responses under ART in children with frequent passage from 1 category to another over time. Close biological evaluation with access to routine plasma HIV-1 RNA load monitoring is crucial for adapting the complex outcomes of ART in HIV-infected children born from infected mothers.
Collapse
Affiliation(s)
| | - Jean-Chrysostome Gody
- Faculté des Sciences de la Santé, Université de Bangui
- Complexe Pédiatrique, Bangui, Central African Republic
| | - Ralph-Sydney Mboumba Bouassa
- Ecole Doctorale d’Infectiologie Tropicale, Franceville, Gabon
- Laboratoire de virologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (AP-HP) and Université Paris Descartes, Paris Sorbonne Cité, Paris, France
| | - Sandrine Moussa
- Institut Pasteur de Bangui, Bangui, Central African Republic
| | - Mohammad-Ali Jenabian
- Département des Sciences Biologiques et Centre de Recherche BioMed, Université du Québec à Montréal (UQAM), Montreal, QC, Canada
| | - Hélène Péré
- Laboratoire de virologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (AP-HP) and Université Paris Descartes, Paris Sorbonne Cité, Paris, France
| | - Charlotte Charpentier
- IAME, UMR 1137, INSERM, Université Paris Diderot, Sorbonne Paris Cité, AP-HP, Laboratoire de Virologie, Hôpital Bichat, AP-HP, Paris, France
| | - Mathieu Matta
- Laboratoire de virologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (AP-HP) and Université Paris Descartes, Paris Sorbonne Cité, Paris, France
| | - Jean De Dieu Longo
- Faculté des Sciences de la Santé, Université de Bangui
- Unité de Recherches et d’Intervention sur les Maladies Sexuellement Transmissibles et le SIDA, Département de Santé Publique, Faculté des Sciences de la Santé de Bangui, Bangui, Central African Republic
| | - Gérard Grésenguet
- Faculté des Sciences de la Santé, Université de Bangui
- Unité de Recherches et d’Intervention sur les Maladies Sexuellement Transmissibles et le SIDA, Département de Santé Publique, Faculté des Sciences de la Santé de Bangui, Bangui, Central African Republic
| | | | - Laurent Bélec
- Laboratoire de virologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (AP-HP) and Université Paris Descartes, Paris Sorbonne Cité, Paris, France
| |
Collapse
|
9
|
Ali A, Furler RL, Pedroza-Martins L, Colantonio AD, Anisman-Posner D, Bryson Y, Yang OO, Uittenbogaart CH. A Novel HIV-1 Nef Mutation in a Primary Pediatric Isolate Impairs MHC-Class I Downregulation and Cytopathicity. AIDS Res Hum Retroviruses 2020; 36:122-130. [PMID: 31571497 DOI: 10.1089/aid.2019.0160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
HIV-1-induced cytopathicity of thymocytes is a major cause of reduced peripheral T cells and rapid disease progression observed in HIV-1-infected infants. Understanding the virulence factors responsible for thymocyte depletion has paramount importance in addressing the pathogenesis of disease progression in children. In this study, thymocyte depletion was analyzed following infection with two primary CXCR4-tropic HIV-1 pediatric isolates (PI), PI-2 and PI-2.1, which were serially derived from an in utero-infected infant. Although highly similar to each other, PI-2 showed markedly decreased thymocyte depletion in vitro compared with PI-2.1. Further analysis showed a novel deletion in the Nef protein (NefΔK7S) of PI-2, which was absent in PI-2.1. This deletion inhibited Nef-mediated major histocompatibility complex class I (MHC-I) downregulation in infected thymocytes in vitro and in vivo; in contrast, the mutated Nef continued to downregulate CD4 surface expression in vitro. These results suggest that HIV-1 Nef contributes to thymic damage in infants through selective functions.
Collapse
Affiliation(s)
- Ayub Ali
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Robert L. Furler
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, New York
| | - Livia Pedroza-Martins
- ANRS, French National Agency for Research on AIDS and Viral Hepatitis, Paris, France
| | - Arnaud D. Colantonio
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles, Los Angeles, California
| | - Deborah Anisman-Posner
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles, Los Angeles, California
| | - Yvonne Bryson
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Department of Pediatrics, University of California, Los Angeles, Los Angeles, California
| | - Otto O. Yang
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Christel H. Uittenbogaart
- UCLA AIDS Institute, University of California, Los Angeles, Los Angeles, California
- Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles, Los Angeles, California
- Department of Pediatrics, University of California, Los Angeles, Los Angeles, California
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California
| |
Collapse
|
10
|
Oripelaye M, Umar A, Olanrewaju F, Onayemi O, Olasode O, Oninla O. Determinants of discordant immune response in a cohort of human immunodeficiency virus-infected patients initiating antiretroviral therapy. SAHEL MEDICAL JOURNAL 2020. [DOI: 10.4103/smj.smj_1_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
11
|
Liu L, Zhang Q, Chen P, Guo N, Song A, Huang X, Xia W, Li L, Moog C, Wu H, Su B, Zhang T. Foxp3 +Helios + regulatory T cells are associated with monocyte subsets and their PD-1 expression during acute HIV-1 infection. BMC Immunol 2019; 20:38. [PMID: 31651258 PMCID: PMC6813100 DOI: 10.1186/s12865-019-0319-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 09/23/2019] [Indexed: 02/07/2023] Open
Abstract
Background Helios has been reported to stabilize regulatory T (Treg) suppressive function. Programmed cell death protein 1 (PD-1) expression in three human monocyte subsets modulates immune responses. Recently, our team reported that three monocyte subsets are associated with T helper cell differentiation in HIV-1-infected patients. Until now, the effects of monocyte subsets and their PD-1 expression on Foxp3+Helios+ Treg cells have not been fully characterized, especially during acute HIV-1 infection. Results The frequency of Foxp3+Helios+CD45RA+ Treg cells is significantly higher in patients with acute HIV-1 infection than those of healthy controls and chronic HIV-1-infected patients undergoing combined antiretroviral therapy. The frequency of Foxp3+Helios+CD45RA+ Treg cells is inversely correlated with CD4 T-cell counts and the CD4/CD8 ratio in chronic HIV-1-infected patients. During acute HIV-1 infection, the frequency of Foxp3+Helios+CD45RA+ Treg cells is inversely correlated with the frequency of the intermediate CD14++CD16+ monocyte subset, but positively correlated with PD-1 expression in both intermediate CD14++CD16+ and non-classical CD14+CD16++ monocyte subsets. Conclusions In this study, the perturbations of Foxp3+Helios+ Treg cells were characterized, and the association between monocyte subsets and their PD-1 expression and Foxp3+Helios+ Treg cells was evaluated during HIV-1 infection. Our observations provide new evidence of the roles for Foxp3+Helios+ Treg cells and PD-1 expression on monocyte subsets in HIV pathogenesis.
Collapse
Affiliation(s)
- Lifeng Liu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Qiuyue Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Peng Chen
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Na Guo
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Aixin Song
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Xiaojie Huang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Wei Xia
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Li Li
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Christiane Moog
- INSERM U1109, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, 67000, Strasbourg, France
| | - Hao Wu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China
| | - Bin Su
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China. .,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China.
| | - Tong Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China. .,Beijing Key Laboratory for HIV/AIDS Research, Beijing, 100069, China.
| |
Collapse
|
12
|
Guo N, Liu L, Yang X, Song T, Li G, Li L, Jiang T, Gao Y, Zhang T, Su B, Wu H. Immunological Changes in Monocyte Subsets and Their Association With Foxp3 + Regulatory T Cells in HIV-1-Infected Individuals With Syphilis: A Brief Research Report. Front Immunol 2019; 10:714. [PMID: 31024549 PMCID: PMC6465566 DOI: 10.3389/fimmu.2019.00714] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 03/18/2019] [Indexed: 12/11/2022] Open
Abstract
The incidence of syphilis has increased dramatically in men who have sex with men (MSM), especially those with HIV-1 infection. Treponema pallidum and HIV-1 are bidirectionally synergistic, accelerating disease progression reciprocally in co-infected individuals. We have shown that monocytes have different effects on T helper cells at different stages of HIV-1 infection. However, the immunological changes in the three monocyte subsets and in regulatory T cells (Tregs), and the associations between these cell types during syphilis infection among HIV-1-infected MSM remain unclear. Herein, we used cell staining methods to explore changes in monocyte subsets and Tregs and any associations between these cells. We found that the frequency of classical monocytes was higher in the rapid plasma reagin (RPR+) group than in the healthy controls (HCs) and the chronic HIV-1 infection (CHI) plus RPR+ (CHI&RPR+) group. The frequencies of Foxp3+CD25+CD45RA+ and Foxp3+Helios+CD45RA+ Tregs were significantly higher in the RPR+, CHI, and CHI&RPR+ groups than in HCs, whereas the frequency of CD45RA+ Tregs was lower in the CHI&RPR+ group than in CHI group. The frequencies of Foxp3+CD25+CD45RO+ and Foxp3+Helios+CD45RO+ Tregs were lower in the RPR+, CHI, and CHI&RPR+ groups than in HCs. The frequency of intermediate monocytes was inversely correlated with the frequency of CD45RA+ Tregs and positively correlated with the frequency of CD45RO+ Tregs. These results demonstrate for the first time that intermediate monocytes control the differentiation of Treg subsets in Treponema pallidum/HIV-1 co-infections. These findings provide new insights into an immunological mechanism involving monocytes/Tregs in HIV-infected individuals with syphilis.
Collapse
Affiliation(s)
- Na Guo
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Lifeng Liu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Xiaodong Yang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Ting Song
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Guanxin Li
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Li Li
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Taiyi Jiang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Yanqing Gao
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Tong Zhang
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Bin Su
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| | - Hao Wu
- Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory for HIV/AIDS Research, Beijing, China
| |
Collapse
|
13
|
Immune Activation, Inflammation, and Non-AIDS Co-Morbidities in HIV-Infected Patients under Long-Term ART. Viruses 2019; 11:v11030200. [PMID: 30818749 PMCID: PMC6466530 DOI: 10.3390/v11030200] [Citation(s) in RCA: 243] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/19/2019] [Accepted: 02/26/2019] [Indexed: 02/07/2023] Open
Abstract
Despite effective antiretroviral therapy (ART), people living with HIV (PLWH) still present persistent chronic immune activation and inflammation. This condition is the result of several factors including thymic dysfunction, persistent antigen stimulation due to low residual viremia, microbial translocation and dysbiosis, caused by the disruption of the gut mucosa, co-infections, and cumulative ART toxicity. All of these factors can create a vicious cycle that does not allow the full control of immune activation and inflammation, leading to an increased risk of developing non-AIDS co-morbidities such as metabolic syndrome and cardiovascular diseases. This review aims to provide an overview of the most recent data about HIV-associated inflammation and chronic immune exhaustion in PLWH under effective ART. Furthermore, we discuss new therapy approaches that are currently being tested to reduce the risk of developing inflammation, ART toxicity, and non-AIDS co-morbidities.
Collapse
|
14
|
Rocco J, Mellors JW, Macatangay BJC. Regulatory T cells: the ultimate HIV reservoir? J Virus Erad 2018; 4:209-214. [PMID: 30515299 PMCID: PMC6248834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Despite significant advances in the understanding of HIV-1 infection, a cure remains out of reach. This is, in part, due to a long-lived HIV-1 reservoir in resting CD4+ T cells, which do not express viral antigens, and thus are invisible to the immune system. These latently infected cells carry replication-competent proviruses and can cause rebound viraemia if antiretrovirals are interrupted. Characterising this HIV-1 reservoir is a challenging task, requiring identification of CD4+ T cell subsets carrying intact proviruses, as well as defining their distribution within the body. Regulatory T cells (Tregs) comprise a subset of CD4+ T cells that are essential for maintaining immune tolerance. HIV-1 is known to infect Tregs in vivo but there is limited understanding of their role in HIV-1 persistence. Recent studies of well-controlled HIV-1 infection on antiretroviral therapy (ART) have shown higher frequencies of inducible, intact proviruses in Tregs compared to other CD4+ T cells, and provirus-containing Tregs have been found in lymphoid tissues at substantial frequencies. This evidence is supportive of a latent HIV-1 reservoir in Tregs, but greater detail is needed, including tissue distribution. An HIV-1 reservoir in Tregs could pose a significant barrier to HIV-1 eradication because Tregs are known to be long lived and resistant to apoptosis. Tregs are also immunosuppressive, and can inhibit cell-mediated immunity through multiple mechanisms. Non-specific depletion of Tregs would be likely to result in severe autoimmunity. Additional research is needed to further characterise regulatory T cells as a reservoir of HIV-1 and as an obstacle to eradication, or immune control, of HIV-1 infection.
Collapse
Affiliation(s)
| | | | - Bernard JC Macatangay
- Corresponding author: Bernard JC Macatangay,
S827 Scaife Hall, 3550 Terrace Street,
Pittsburgh,
PA15261,
USA
| |
Collapse
|
15
|
|
16
|
Nag M, De Paris K, E Fogle J. Epigenetic Modulation of CD8⁺ T Cell Function in Lentivirus Infections: A Review. Viruses 2018; 10:v10050227. [PMID: 29710792 PMCID: PMC5977220 DOI: 10.3390/v10050227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 04/23/2018] [Accepted: 04/24/2018] [Indexed: 01/16/2023] Open
Abstract
CD8+ T cells are critical for controlling viremia during human immunodeficiency virus (HIV) infection. These cells produce cytolytic factors and antiviral cytokines that eliminate virally- infected cells. During the chronic phase of HIV infection, CD8+ T cells progressively lose their proliferative capacity and antiviral functions. These dysfunctional cells are unable to clear the productively infected and reactivated cells, representing a roadblock in HIV cure. Therefore, mechanisms to understand CD8+ T cell dysfunction and strategies to boost CD8+ T cell function need to be investigated. Using the feline immunodeficiency virus (FIV) model for lentiviral persistence, we have demonstrated that CD8+ T cells exhibit epigenetic changes such as DNA demethylation during the course of infection as compared to uninfected cats. We have also demonstrated that lentivirus-activated CD4+CD25+ T regulatory cells induce forkhead box P3 (Foxp3) expression in virus-specific CD8+ T cell targets, which binds the interleukin (IL)-2, tumor necrosis factor (TNF)-α, and interferon (IFN)-γ promoters in these CD8+ T cells. Finally, we have reported that epigenetic modulation reduces Foxp3 binding to these promoter regions. This review compares and contrasts our current understanding of CD8+ T cell epigenetics and mechanisms of lymphocyte suppression during the course of lentiviral infection for two animal models, FIV and simian immunodeficiency virus (SIV).
Collapse
Affiliation(s)
- Mukta Nag
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27607, USA.
| | - Kristina De Paris
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Jonathan E Fogle
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27607, USA.
| |
Collapse
|
17
|
Are the immunomodulatory properties of Lactobacillus rhamnosus CRL1505 peptidoglycan common for all Lactobacilli during respiratory infection in malnourished mice? PLoS One 2018. [PMID: 29518131 PMCID: PMC5843338 DOI: 10.1371/journal.pone.0194034] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Previously, we reported that Lactobacillus rhamnosus CRL1505 peptidoglycan (PG05) improves the innate immune response in immunocompromised-malnourished mice after Streptococcus pneumoniae infection. This study extends those previous findings by demonstrating that the dietary recovery of malnourished mice with nasal administration of PG05 improves not only the innate immune response but the respiratory and systemic adaptive humoral response as well. PG05 enhanced the Th2 response, the recovery of B cells, and the concentration and opsonophagocytic activity of anti-pneumococcal antibodies. In addition, by performing comparative studies with the peptidoglycans from lactobacilli of the same species (L. rhamnosus CRL534) or with similar immunomodulatory properties (L. plantarum CRL1506), we demonstrated here that PG05 has unique immunomodulatory properties that cannot be extended to peptidoglycans from other probiotic strains. However, the knowledge of the molecular characteristics of PG05 is indispensable to understand immunomodulatory abilities of L. rhamnosus CRL1505.
Collapse
|
18
|
Borrow P, Moody MA. Immunologic characteristics of HIV-infected individuals who make broadly neutralizing antibodies. Immunol Rev 2017; 275:62-78. [PMID: 28133804 PMCID: PMC5299500 DOI: 10.1111/imr.12504] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Induction of broadly neutralizing antibodies (bnAbs) capable of inhibiting infection with diverse variants of human immunodeficiency virus type 1 (HIV‐1) is a key, as‐yet‐unachieved goal of prophylactic HIV‐1 vaccine strategies. However, some HIV‐infected individuals develop bnAbs after approximately 2‐4 years of infection, enabling analysis of features of these antibodies and the immunological environment that enables their induction. Distinct subsets of CD4+ T cells play opposing roles in the regulation of humoral responses: T follicular helper (Tfh) cells support germinal center formation and provide help for affinity maturation and the development of memory B cells and plasma cells, while regulatory CD4+ (Treg) cells including T follicular regulatory (Tfr) cells inhibit the germinal center reaction to limit autoantibody production. BnAbs exhibit high somatic mutation frequencies, long third heavy‐chain complementarity determining regions, and/or autoreactivity, suggesting that bnAb generation is likely to be highly dependent on the activity of CD4+ Tfh cells, and may be constrained by host tolerance controls. This review discusses what is known about the immunological environment during HIV‐1 infection, in particular alterations in CD4+ Tfh, Treg, and Tfr populations and autoantibody generation, and how this is related to bnAb development, and considers the implications for HIV‐1 vaccine design.
Collapse
Affiliation(s)
- Persephone Borrow
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - M Anthony Moody
- Duke University Human Vaccine Institute and Departments of Pediatrics and Immunology, Duke University School of Medicine, Durham, NC, USA
| |
Collapse
|
19
|
Barbieri N, Herrera M, Salva S, Villena J, Alvarez S. Lactobacillus rhamnosus CRL1505 nasal administration improves recovery of T-cell mediated immunity against pneumococcal infection in malnourished mice. Benef Microbes 2017; 8:393-405. [DOI: 10.3920/bm2016.0152] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Immunobiotic lactic acid bacteria have become an interesting alternative for the prevention of respiratory infections. Previously, we demonstrated that the nasal administration of Lactobacillus rhamnosus CRL1505, during repletion of malnourished mice, resulted in diminished susceptibility to the challenge with the respiratory pathogen Streptococcus pneumoniae. Considering the known alterations induced by malnutrition on T lymphocytes and the importance of this cell population on the protection against respiratory pathogens, we aimed to study the effect of L. rhamnosus CRL1505 nasal administration on the recovery of T cell-mediated defences against pneumococcal infection in malnourished mice under nutritional recovery. Malnourished mice received a balanced conventional diet (BCD) for seven days or BCD for seven days with nasal L. rhamnosus CRL1505 supplementation during last two days of the treatment. After the treatments mice were infected with S. pneumoniae. Flow cytometry studies were carried out in bone marrow, thymus, spleen and lung to study T cells, and Th1/Th2 cytokine profiles were determined in broncho-alveolar lavages and serum. The administration of CRL1505 strain to malnourished mice under recovery reduced quantitative and qualitative alterations of CD4+ T cells in the bone marrow, thymus, spleen and lung induced by malnutrition. In addition, CRL1505 treatment augmented Th2-cytokines (interleukin 10 and 4) in respiratory and systemic compartments after pneumococcal infection. These results show that modulation of CD4+ T lymphocytes induced by L. rhamnosus CRL1505 has an important role in the beneficial effect induced by this strain on the recovery of malnourished mice. These data also indicate that nasally administered L. rhamnosus CRL1505 may represent a non-invasive alternative to modulate and improve the T cell-mediated immunity against respiratory pathogens in immunocompromised malnourished hosts.
Collapse
Affiliation(s)
- N. Barbieri
- Laboratorio de Inmunobiotecnología, Centro de Referencia para Lactobacilos (CERELA-CONICET), Chacabuco 145, Tucumán (CP 4000), Argentina
- Departamento de Ciencias Básicas y Tecnológicas, Universidad Nacional de Chilecito, 9 de Julio 22, Chilecito (F5360CKB), La Rioja, Argentina
| | - M. Herrera
- Laboratorio de Inmunobiotecnología, Centro de Referencia para Lactobacilos (CERELA-CONICET), Chacabuco 145, Tucumán (CP 4000), Argentina
| | - S. Salva
- Laboratorio de Inmunobiotecnología, Centro de Referencia para Lactobacilos (CERELA-CONICET), Chacabuco 145, Tucumán (CP 4000), Argentina
| | - J. Villena
- Laboratorio de Inmunobiotecnología, Centro de Referencia para Lactobacilos (CERELA-CONICET), Chacabuco 145, Tucumán (CP 4000), Argentina
| | - S. Alvarez
- Laboratorio de Inmunobiotecnología, Centro de Referencia para Lactobacilos (CERELA-CONICET), Chacabuco 145, Tucumán (CP 4000), Argentina
- Instituto de Bioquímica Aplicada, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Balcarce 747, Tucumán (CP 4000), Argentina
| |
Collapse
|
20
|
Mzingwane ML, Tiemessen CT. Mechanisms of HIV persistence in HIV reservoirs. Rev Med Virol 2017; 27. [PMID: 28128885 DOI: 10.1002/rmv.1924] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/21/2016] [Accepted: 12/23/2016] [Indexed: 01/18/2023]
Abstract
The establishment and maintenance of HIV reservoirs that lead to persistent viremia in patients on antiretroviral drugs remains the greatest challenge of the highly active antiretroviral therapy era. Cellular reservoirs include resting memory CD4+ T lymphocytes, implicated as the major HIV reservoir, having a half-life of approximately 44 months while this is less than 6 hours for HIV in plasma. In some individuals, persistent viremia consists of invariant HIV clones not detected in circulating resting CD4+ T lymphocytes suggesting other possible sources of residual viremia. Some anatomical reservoirs that may harbor such cells include the brain and the central nervous system, the gastrointestinal tract and the gut-associated lymphoid tissue and other lymphoid organs, and the genital tract. The presence of immune cells and other HIV susceptible cells, occurring in differing compositions in anatomical reservoirs, coupled with variable and poor drug penetration that results in suboptimal drug concentrations in some sites, are all likely factors that fuel the continued low-level replication and persistent viremia during treatment. Latently, HIV-infected CD4+ T cells harboring replication-competent virus, HIV cell-to-cell spread, and HIV-infected T cell homeostatic proliferation due to chronic immune activation represent further drivers of this persistent HIV viremia during highly active antiretroviral therapy.
Collapse
Affiliation(s)
- Mayibongwe L Mzingwane
- Department of Medical Virology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa.,Department of Pathology, Faculty of Medicine, National University of Science and Technology, Bulawayo, Zimbabwe
| | - Caroline T Tiemessen
- Centre for HIV and Sexually Transmitted Infections, National Institute for Communicable Diseases, Johannesburg, South Africa.,Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| |
Collapse
|
21
|
Matteucci C, Grelli S, Balestrieri E, Minutolo A, Argaw-Denboba A, Macchi B, Sinibaldi-Vallebona P, Perno CF, Mastino A, Garaci E. Thymosin alpha 1 and HIV-1: recent advances and future perspectives. Future Microbiol 2017; 12:141-155. [PMID: 28106477 DOI: 10.2217/fmb-2016-0125] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In spite of the consistent benefits for HIV-1 infected patients undergoing antiretroviral therapy, a complete immune reconstitution is usually not achieved. Actually, antiretroviral therapy may be frequently accompanied by immunological unresponsiveness, persistent inflammatory conditions and inefficient cytotoxic T-cell response. Thymosin alpha 1 is a thymic peptide that demonstrates a peculiar ability to restore immune system homeostasis in different physiological and pathological conditions (i.e., infections, cancer, immunodeficiency, vaccination and aging) acting as multitasking protein depending on the host state of inflammation or immune dysfunction. This review reports the present knowledge on the in vitro and in vivo studies concerning the use of thymosin alpha 1 in HIV-1 infection. Recent findings and future perspectives of therapeutic intervention are discussed.
Collapse
Affiliation(s)
- Claudia Matteucci
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Sandro Grelli
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Emanuela Balestrieri
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Antonella Minutolo
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Ayele Argaw-Denboba
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Beatrice Macchi
- Department of System Medicine, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Paola Sinibaldi-Vallebona
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy.,Institute of Translational Pharmacology, National Research Council, Via Fosso del Cavaliere, 100, Rome 00133, Italy
| | - Carlo Federico Perno
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy
| | - Antonio Mastino
- Institute of Translational Pharmacology, National Research Council, Via Fosso del Cavaliere, 100, Rome 00133, Italy.,Department of Chemical, Biological, Pharmaceutical & Environmental Sciences, University of Messina, Via F. Stagno d'Alcontres 31, Messina 98166, Italy
| | - Enrico Garaci
- Department of Experimental Medicine & Surgery, University of Rome 'Tor Vergata', Via Montepellier, 1, Rome 00133, Italy.,IRCSS San Raffaele Pisana, Scientific Institute for Research, Hospitalization & Health Care, Via di Val Cannuta, 247, Roma 00166, Italy
| |
Collapse
|
22
|
Sampath R, Cummins NW, Badley AD. Casp8p41: The Protean Mediator of Death in CD4 T-cells that Replicate HIV. J Cell Death 2016; 9:9-17. [PMID: 27721655 PMCID: PMC5040423 DOI: 10.4137/jcd.s39872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 06/12/2016] [Accepted: 06/14/2016] [Indexed: 01/15/2023] Open
Abstract
HIV cure is now the focus of intense research after Timothy Ray Brown (the Berlin patient) set the precedent of being the first and only person cured. A major barrier to achieving this goal on a meaningful scale is an elimination of the latent reservoir, which is thought to comprise CD4-positive cells that harbor integrated, replication-competent HIV provirus. These cells do not express viral proteins, are indistinguishable from uninfected CD4 cells, and are thought to be responsible for HIV viral rebound—that occurs within weeks of combination anti retroviral therapy (cART) interruption. Modalities to engineer transcriptional stimulation (reactivation) of this dormant integrated HIV provirus, leading to expression of cytotoxic viral proteins, are thought to be a specific way to eradicate the latently infected CD4 pool and are becoming increasingly relevant in the era of HIV cure. HIV protease is one such protein produced after HIV reactivation that cleaves procaspase-8 to generate a novel protein Casp8p41. Casp8p41 then binds to the BH3 domain of BAK, leading to BAK oligomerization, mitochondrial depolarization, and apoptosis. In central memory T cells (TCMs) from HIV-infected patients, an elevated Bcl-2/procaspase-8 ratio was observed, and Casp8p41 binding to Bcl-2 was associated with a lack of reactivation-induced cell death. This was reversed by priming cells with a specific Bcl-2 antagonist prior to reactivation, resulting in increased cell death and decreased HIV DNA in a Casp8p41-dependent pathway. This review describes the biology, clinical relevance, and implications of Casp8p41 for a potential cure.
Collapse
Affiliation(s)
- Rahul Sampath
- Division of Infectious Diseases, Mayo Clinic, Rochester, MN, USA
| | - Nathan W Cummins
- Division of Infectious Diseases, Mayo Clinic, Rochester, MN, USA
| | - Andrew D Badley
- Division of Infectious Diseases, Mayo Clinic, Rochester, MN, USA
| |
Collapse
|
23
|
Manjati T, Nkambule B, Ipp H. Immune activation is associated with decreased thymic function in asymptomatic, untreated HIV-infected individuals. South Afr J HIV Med 2016; 17:445. [PMID: 29568606 PMCID: PMC5843076 DOI: 10.4102/sajhivmed.v17i1.445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 05/25/2016] [Indexed: 11/15/2022] Open
Abstract
Background Reduced thymic function causes poor immunological reconstitution in human immunodeficiency virus (HIV)-positive patients on combined antiretroviral therapy (cART). The association between immune activation and thymic function in asymptomatic HIV-positive treatment-naive individuals has thus far not been investigated. Aims and objectives To optimise a five-colour flow cytometric assay for measurement of thymic function by measuring recent thymic emigrants (RTEs) in treatment-naive HIV-infected patients and healthy controls and correlate results with levels of immune activation, CD4 counts and viral load. Methods Blood obtained from 53 consenting HIV-positive individuals and 32 controls recruited from HIV prevention and testing clinic in Cape Town, South Africa. RTEs were measured (CD3+/CD4+/CD45RA+/CD31+/CD62L+) and levels were correlated with CD4 counts of HIV-infected individuals, log viral load and levels of immune activation (CD8+/CD38+ T-cells). Results HIV-infected individuals had reduced frequencies of RTEs when compared to controls (p = 0.0035). Levels of immune activation were inversely correlated with thymic function (p = 0.0403), and the thymic function in HIV-infected individuals showed no significant correlation with CD4 counts (p = 0.31559) and viral load (p = 0.20628). Conclusions There was impaired thymic function in HIV-infected individuals, which was associated with increased levels of immune activation. The thymic dysfunction was not associated with CD4 counts and viral load. Immune activation may result in inflammatory damage to the thymus and subsequent thymic dysfunction, and CD4 counts and viral load may not necessarily reflect thymic dysfunction in HIV.
Collapse
Affiliation(s)
- Thandiwe Manjati
- Division of Haematology, Department of Pathology, Stellenbosch University, South Africa.,Division of Haematopathology, National Health Laboratory Service, Tygerberg Hospital, Cape Town, South Africa
| | - Bongani Nkambule
- Division of Haematopathology, National Health Laboratory Service, Tygerberg Hospital, Cape Town, South Africa.,Department of Physiology, School of Laboratory and Medical Sciences, University of KwaZulu-Natal, South Africa
| | - Hayley Ipp
- Division of Haematology, Department of Pathology, Stellenbosch University, South Africa.,Division of Haematopathology, National Health Laboratory Service, Tygerberg Hospital, Cape Town, South Africa
| |
Collapse
|
24
|
Discordant Immune Response with Antiretroviral Therapy in HIV-1: A Systematic Review of Clinical Outcomes. PLoS One 2016; 11:e0156099. [PMID: 27284683 PMCID: PMC4902248 DOI: 10.1371/journal.pone.0156099] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/08/2016] [Indexed: 12/16/2022] Open
Abstract
Background A discordant immune response (DIR) is a failure to satisfactorily increase CD4 counts on ART despite successful virological control. Literature on the clinical effects of DIR has not been systematically evaluated. We aimed to summarise the risk of mortality, AIDS and serious non-AIDS events associated with DIR with a systematic review. Methods The protocol is registered with the Centre for Review Dissemination, University of York (registration number CRD42014010821). Included studies investigated the effect of DIR on mortality, AIDS, or serious non-AIDS events in cohort studies or cohorts contained in arms of randomised controlled trials for adults aged 16 years or older. DIR was classified as a suboptimal CD4 count (as defined by the study) despite virological suppression following at least 6 months of ART. We systematically searched PubMed, Embase, and the Cochrane Library to December 2015. Risk of bias was assessed using the Cochrane tool for assessing risk of bias in cohort studies. Two authors applied inclusion criteria and one author extracted data. Risk ratios were calculated for each clinical outcome reported. Results Of 20 studies that met the inclusion criteria, 14 different definitions of DIR were used. Risk ratios for mortality in patients with and without DIR ranged between 1.00 (95% CI 0.26 to 3.92) and 4.29 (95% CI 1.96 to 9.38) with the majority of studies reporting a 2 to 3 fold increase in risk. Conclusions DIR is associated with a marked increase in mortality in most studies but definitions vary widely. We propose a standardised definition to aid the development of management options for DIR.
Collapse
|
25
|
O'Connor MA, Vella JL, Green WR. Reciprocal relationship of T regulatory cells and monocytic myeloid-derived suppressor cells in LP-BM5 murine retrovirus-induced immunodeficiency. J Gen Virol 2015; 97:509-522. [PMID: 26253145 DOI: 10.1099/jgv.0.000260] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Immunomodulatory cellular subsets, including myeloid-derived suppressor cells (MDSCs) and T regulatory cells (Tregs), contribute to the immunosuppressive tumour microenvironment and are targets of immunotherapy, but their role in retroviral-associated immunosuppression is less well understood. Due to known crosstalk between Tregs and MDSCs in the tumour microenvironment, and also their hypothesized involvement during human immunodeficiency virus/simian immunodeficiency virus infection, studying the interplay between these immune cells during LP-BM5 retrovirus-induced murine AIDS is of interest. IL-10-producing FoxP3+ Tregs expanded after LP-BM5 infection. Following in vivo adoptive transfer of natural Treg (nTreg)-depleted CD4+T-cells, and subsequent LP-BM5 retroviral infection, enriched monocytic MDSCs (M-MDSCs) from these nTreg-depleted mice displayed altered phenotypic subsets. In addition, M-MDSCs from LP-BM5-infected nTreg-depleted mice exhibited increased suppression of T-cell, but not B-cell, responses, compared with M-MDSCs derived from non-depleted LP-BM5-infected controls. Additionally, LP-BM5-induced M-MDSCs modulated the production of IL-10 by FoxP3+ Tregs in vitro. These collective data highlight in vitro and for the first time, to the best of our knowledge, in vivo reciprocal modulation between retroviral-induced M-MDSCs and Tregs, and may provide insight into the immunotherapeutic targeting of such regulatory cells during retroviral infection.
Collapse
Affiliation(s)
- Megan A O'Connor
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA
| | - Jennifer L Vella
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA
| | - William R Green
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA.,Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA
| |
Collapse
|
26
|
Chisenga CC, Filteau S, Siame J, Chisenga M, Prendergast AJ, Kelly P. T-Cell Subsets Predict Mortality in Malnourished Zambian Adults Initiating Antiretroviral Therapy. PLoS One 2015; 10:e0129928. [PMID: 26083409 PMCID: PMC4470912 DOI: 10.1371/journal.pone.0129928] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 05/14/2015] [Indexed: 12/04/2022] Open
Abstract
Objective To estimate the prognostic value of T-cell subsets in Zambian patients initiating antiretroviral therapy (ART), and to assess the impact of a nutritional intervention on T-cell subsets. Methods This was a sub-study of a randomised clinical trial of a nutritional intervention for malnourished adults initiating ART. Participants in a randomised controlled trial (NUSTART trial) were enrolled between April and December 2012. Participants received lipid-based nutritional supplement either with or without additional vitamins and minerals. Immunophenotyping was undertaken at baseline and, in survivors, after 12 weeks of ART to characterize T-cell subsets using the markers CD3, CD4, CD8, CD45RA, CCR7, CD28, CD57, CD31, α4β7, Ki67, CD25 and HLA-DR. Univariate and multivariate survival analysis was performed, and responses to treatment were analysed using the Wicoxon rank-sum test. Results Among 181 adults, 36 (20%) died by 12 weeks after starting ART. In univariate analysis, patients who died had fewer proliferating, more naïve and fewer gut homing CD4+ T-cells compared to survivors; and more senescent and fewer proliferating CD8+ T-cells. In a multivariate Cox regression model high naïve CD4+, low proliferating CD4+, high senescent CD8+ and low proliferating CD8+ subsets were independently associated with increased risk of death. Recent CD4+ thymic emigrants increased less between recruitment and 12 weeks of ART in the intervention group compared to the control group. Conclusions Specific CD4+ T-cell subsets are of considerable prognostic significance for patients initiating ART in Zambia, but only thymic output responded to this nutritional intervention.
Collapse
Affiliation(s)
- Caroline C. Chisenga
- Tropical Gastroenterology and Nutrition group, University of Zambia School of Medicine, Lusaka, Zambia
- NUSTART project, University Teaching Hospital, Lusaka, Zambia
- * E-mail:
| | - Suzanne Filteau
- NUSTART project, University Teaching Hospital, Lusaka, Zambia
- London School of Hygiene & Tropical Medicine, London, United Kingdom
| | - Joshua Siame
- NUSTART project, University Teaching Hospital, Lusaka, Zambia
| | - Molly Chisenga
- NUSTART project, University Teaching Hospital, Lusaka, Zambia
| | - Andrew J. Prendergast
- Barts & The London School of Medicine, Queen Mary University of London, London, United Kingdom
| | - Paul Kelly
- Tropical Gastroenterology and Nutrition group, University of Zambia School of Medicine, Lusaka, Zambia
- NUSTART project, University Teaching Hospital, Lusaka, Zambia
- London School of Hygiene & Tropical Medicine, London, United Kingdom
- Barts & The London School of Medicine, Queen Mary University of London, London, United Kingdom
| |
Collapse
|
27
|
Vallejo A, Abad-Fernández M, Moreno S, Moreno A, Pérez-Elías MJ, Dronda F, Casado JL. High levels of CD4⁺ CTLA-4⁺ Treg cells and CCR5 density in HIV-1-infected patients with visceral leishmaniasis. Eur J Clin Microbiol Infect Dis 2014; 34:267-75. [PMID: 25142804 DOI: 10.1007/s10096-014-2229-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 08/11/2014] [Indexed: 02/08/2023]
Abstract
Visceral leishmaniasis (VL) in HIV-1-infected patients has been associated with poor immunological recovery and frequent disease relapses. The aim of this study was to analyse the role of T cell populations, Treg cells and CCR5 density in patients with VL compared to HIV-1-infected patients without leishmaniasis. A cross-sectional study of nine Leishmania-HIV-1-coinfected (LH) patients with VL receiving suppressive cART for at least 1 year were compared to 16 HIV-1-infected patients with non-immunological response (NIR, CD4 count below 250 cells/mm(3)) and 26 HIV-1-infected patients with immunological response (IR, CD4 count above 500 cells/mm(3)) without leishmaniasis. LH patients had a deep depletion of naïve T cells (p = 0.002), despite similar levels of effector T cells compared to NIR patients. CD4 Treg cells were similar compared to NIR patients, but higher compared to IR patients (p < 0.001). Interestingly, CD4 Treg CTLA-4(+) cells were higher in LH patients compared to either NIR or IR patients (p = 0.022 and p < 0.001, respectively), and the CD4 Treg/TEM ratio was similar to NIR patients, but higher compared to IR patients (p = 0.017). CCR5(+) T cell levels were higher compared to IR patients (p < 0.001), while CCR5 density on T cells were higher compared to both NIR and IR patients (p < 0.005 in both cases). Higher levels of CD4(+) CTLA-4(+) Treg cells and CCR5 density on CD8(+) T cells are strongly associated with VL in HIV-1-infected patients. Also, these patients have a poor immunological profile that might explain the persistence and relapse of the pathogen.
Collapse
Affiliation(s)
- A Vallejo
- Department of Infectious Diseases, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), University Hospital Ramón y Cajal, Ctra Colmenar Km 9, 28034, Madrid, Spain,
| | | | | | | | | | | | | |
Collapse
|
28
|
Attenuation of pathogenic immune responses during infection with human and simian immunodeficiency virus (HIV/SIV) by the tetracycline derivative minocycline. PLoS One 2014; 9:e94375. [PMID: 24732038 PMCID: PMC3986096 DOI: 10.1371/journal.pone.0094375] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 03/15/2014] [Indexed: 01/16/2023] Open
Abstract
HIV immune pathogenesis is postulated to involve two major mechanisms: 1) chronic innate immune responses that drive T cell activation and apoptosis and 2) induction of immune regulators that suppress T cell function and proliferation. Both arms are elevated chronically in lymphoid tissues of non-natural hosts, which ultimately develop AIDS. However, these mechanisms are not elevated chronically in natural hosts of SIV infection that avert immune pathogenesis despite similarly high viral loads. In this study we investigated whether minocycline could modulate these pathogenic antiviral responses in non-natural hosts of HIV and SIV. We found that minocycline attenuated in vitro induction of type I interferon (IFN) and the IFN-stimulated genes indoleamine 2,3-dioxygenase (IDO1) and TNF-related apoptosis inducing ligand (TRAIL) in human plasmacytoid dendritic cells and PBMCs exposed to aldrithiol-2 inactivated HIV or infectious influenza virus. Activation-induced TRAIL and expression of cytotoxic T-lymphocyte antigen 4 (CTLA-4) in isolated CD4+ T cells were also reduced by minocycline. Translation of these in vitro findings to in vivo effects, however, were mixed as minocycline significantly reduced markers of activation and activation-induced cell death (CD25, Fas, caspase-3) but did not affect expression of IFNβ or the IFN-stimulated genes IDO1, FasL, or Mx in the spleens of chronically SIV-infected pigtailed macaques. TRAIL expression, reflecting the mixed effects of minocycline on activation and type I IFN stimuli, was reduced by half, but this change was not significant. These results show that minocycline administered after infection may protect against aspects of activation-induced cell death during HIV/SIV immune disease, but that in vitro effects of minocycline on type I IFN responses are not recapitulated in a rapid progressor model in vivo.
Collapse
|
29
|
Veiga-Parga T, Sehrawat S, Rouse BT. Role of regulatory T cells during virus infection. Immunol Rev 2014; 255:182-96. [PMID: 23947355 DOI: 10.1111/imr.12085] [Citation(s) in RCA: 165] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The host response to viruses includes multiple cell types that have regulatory function. Most information focuses on CD4(+) regulatory T cells that express the transcription factor Foxp3(+) (Tregs), which are the topic of this review. We explain how viruses through specific and non-specific means can trigger the response of thymus-derived natural Tregs as well as induce Tregs. The latter derive under appropriate stimulation conditions either from uncommitted precursors or from differentiated cells that convert to become Tregs. We describe instances where Tregs appear to limit the efficacy of antiviral protective immunity and other, perhaps more common, immune-mediated inflammatory conditions, where the Tregs function to limit the extent of tissue damage that occurs during a virus infection. We discuss the controversial roles that Tregs may play in the pathogenesis of human immunodeficiency and hepatitis C virus infections. The issue of plasticity is discussed, as this may result in Tregs losing their protective function when present in inflammatory environments. Finally, we mention approaches used to manipulate Treg numbers and function and assess their current value and likely future success to manage the outcome of virus infection, especially those that are responsible for chronic tissue damage.
Collapse
Affiliation(s)
- Tamara Veiga-Parga
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37996, USA
| | | | | |
Collapse
|
30
|
Malhotra A, Whitley-Williams PN, Gaur S, Petrova A. Treatment Response in Association with Adherence Patterns to Highly Active Antiretroviral Therapy in Pediatric Patients with Perinatally Acquired HIV Infection. ACTA ACUST UNITED AC 2014; 13:461-5. [DOI: 10.1177/2325957414521498] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Background: Assessment of longitudinal adherence patterns on virologic and immunologic responses to HAART in perinatally acquired HIV patients has not been studied. Methods: Perinatally infected pediatric HIV patients with adherence documented at least twice and corresponding viral load and T-cell (%) data measured during 2008-2009 were studied. Multiple adherence measures were utilized to identify patients with persistent adherence, nonadherence, or alteration of adherence. Virologic and immunologic outcomes were assessed. Results: Persistent adherence, nonadherence, and alteration of adherence to HAART were recorded in 41.9%, 8.1%, and 50.0% of 62 studied patients. Persistent adherence was associated with higher likelihood for persistent virologic suppression and lower risk for persistent virologic failure. Conclusion: Alteration of adherence to HAART is a significant predictor of persistent virologic failure and high viremia in perinatally infected HIV patients. Implementation of longitudinal adherence assessments may target patients with nonsustained adherence patterns and help decrease the risk for virologic failure and disease progression.
Collapse
Affiliation(s)
- Amisha Malhotra
- Department of Pediatrics, Division of Infectious Disease, Rutgers University–Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Patricia N. Whitley-Williams
- Department of Pediatrics, Division of Infectious Disease, Rutgers University–Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Sunanda Gaur
- Department of Pediatrics, Division of Infectious Disease, Rutgers University–Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Anna Petrova
- Department of Pediatrics, Division of Infectious Disease, Rutgers University–Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| |
Collapse
|
31
|
Peraire J, Viladés C, Pacheco YM, López-Dupla M, Domingo P, Gutiérrez M, Rosado I, Leal M, Richart C, Vidal F. Evaluation of the pharmacogenetics of immune recovery in treated HIV-infected patients. Expert Opin Drug Metab Toxicol 2013; 10:81-101. [PMID: 24256435 DOI: 10.1517/17425255.2014.854330] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
INTRODUCTION Combination antiretroviral therapy has markedly improved the survival rate and quality of life in patients infected with HIV due to the powerful suppressor effect that current antiretroviral drugs have on the viral load. Consequently, the immune system undergoes a substantial qualitative and quantitative improvement; and this leads to an increase in the absolute CD4(+) T-lymphocyte count and the restoration of lost T-cell responses against certain opportunistic pathogens. Unfortunately, not all patients who successfully suppress plasma viremia experience sufficient CD4(+) T-cell gain and these patients, in turn, are associated with worse outcomes. Pharmacogenetic studies have been used to investigate how a patient's genetic predisposition may affect their response to antiretroviral drugs. AREAS COVERED This article reviews the investigations that have been published on the association between host genetic determinants of CD4(+) T-cell gain in treated HIV-infected patients. Studies were identified through a PubMed database search. Longitudinal studies into pharmacogenetic association were specifically selected. EXPERT OPINION While the possibility of genetic predisposition to HIV therapeutics has potential, most studies provide inconsistent data. Inconsistency is often due to partial genetic evaluation, different categorization of poor immune recovery or due to small numbers of patients evaluated. Currently, studies still belong to the research laboratory stage and more studies are required to improve our understanding.
Collapse
Affiliation(s)
- Joaquim Peraire
- Hospital Universitari de Tarragona Joan XXIII, IISPV, Universitat Rovira i Virgili , Tarragona , Spain +0034977295833 ; +0034977295833 ;
| | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Tomasicchio M, Avenant C, Du Toit A, Ray RM, Hapgood JP. The progestin-only contraceptive medroxyprogesterone acetate, but not norethisterone acetate, enhances HIV-1 Vpr-mediated apoptosis in human CD4+ T cells through the glucocorticoid receptor. PLoS One 2013; 8:e62895. [PMID: 23658782 PMCID: PMC3643923 DOI: 10.1371/journal.pone.0062895] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 03/26/2013] [Indexed: 12/25/2022] Open
Abstract
The glucocorticoid receptor (GR) regulates several physiological functions, including immune function and apoptosis. The HIV-1 virus accessory protein, viral protein R (Vpr), can modulate the transcriptional response of the GR. Glucocorticoids (GCs) and Vpr have been reported to induce apoptosis in various cells, including T-cells. We have previously shown that the injectable contraceptive, medroxyprogesterone acetate (MPA) is a partial to full agonist for the GR, unlike norethisterone acetate (NET-A). We investigated the functional cross talk between the GR and Vpr in inducing apoptosis in CD4(+) T-cells, in the absence and presence of GCs and these progestins, as well as progesterone. By using flow cytometry, we show that, in contrast to NET-A and progesterone, the synthetic GR ligand dexamethasone (Dex), cortisol and MPA induce apoptosis in primary CD4(+) T-cells. Furthermore, the C-terminal part of the Vpr peptide, or HIV-1 pseudovirus, together with Dex or MPA further increased the apoptotic phenotype, unlike NET-A and progesterone. By a combination of Western blotting, PCR and the use of receptor- selective agonists, we provide evidence that the GR and the estrogen receptor are the only steroid receptors expressed in peripheral blood mononuclear cells. These results, together with the findings that RU486, a GR antagonist, prevents Dex-, MPA- and Vpr-mediated apoptosis, provide evidence for the first time that GR agonists or partial agonists increase apoptosis in primary CD4(+) T-cells via the GR. We show that apoptotic induction involves differential expression of key apoptotic genes by both Vpr and GCs/MPA. This work suggests that contraceptive doses of MPA but not NET-A or physiological doses of progesterone could potentially accelerate depletion of CD4(+) T-cells in a GR-dependent fashion in HIV-1 positive women, thereby contributing to immunodeficiency. The results imply that choice of progestin used in contraception may be critical to susceptibility and progression of diseases such as HIV-1.
Collapse
Affiliation(s)
- Michele Tomasicchio
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, Western Province, South Africa
| | - Chanel Avenant
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, Western Province, South Africa
| | - Andrea Du Toit
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, Western Province, South Africa
| | - Roslyn M. Ray
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, Western Province, South Africa
| | - Janet P. Hapgood
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, Western Province, South Africa
| |
Collapse
|
33
|
Imami N, Westrop SJ, Grageda N, Herasimtschuk AA. Long-Term Non-Progression and Broad HIV-1-Specific Proliferative T-Cell Responses. Front Immunol 2013; 4:58. [PMID: 23459797 PMCID: PMC3585435 DOI: 10.3389/fimmu.2013.00058] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Accepted: 02/17/2013] [Indexed: 12/30/2022] Open
Abstract
Complex mechanisms underlying the maintenance of fully functional, proliferative, HIV-1-specific T-cell responses involve processes from early T-cell development through to the final stages of T-cell differentiation and antigen recognition. Virus-specific proliferative CD4 and CD8 T-cell responses, important for the control of infection, are observed in some HIV-1(+) patients during early stages of disease, and are maintained in long-term non-progressing subjects. In the vast majority of HIV-1(+) patients, full immune functionality is lost when proliferative HIV-1-specific T-cell responses undergo a variable progressive decline throughout the course of chronic infection. This appears irreparable despite administration of potent combination antiretroviral therapy, which to date is non-curative, necessitating life-long administration and the development of effective, novel, therapeutic interventions. While a sterilizing cure, involving clearance of virus from the host, remains a primary aim, a "functional cure" may be a more feasible goal with considerable impact on worldwide HIV-1 infection. Such an approach would enable long-term co-existence of host and virus in the absence of toxic and costly drugs. Effective immune homeostasis coupled with a balanced response appropriately targeting conserved viral antigens, in a manner that avoids hyperactivation and exhaustion, may prove to be the strongest correlate of durable viral control. This review describes novel concepts underlying full immune functionality in the context of HIV-1 infection, which may be utilized in future strategies designed to improve upon existing therapy. The aim will be to induce long-term non-progressor or elite controller status in every infected host, through immune-mediated control of viremia and reduction of viral reservoirs, leading to lower HIV-1 transmission rates.
Collapse
Affiliation(s)
- Nesrina Imami
- Department of Medicine, Imperial College LondonLondon, UK
| | | | | | | |
Collapse
|
34
|
Abstract
Natural regulatory T cells (Tregs) participate in responses to various chronic infections including HIV. HIV infection is associated with a progressive CD4 lymphopenia and defective HIV-specific CD8 responses known to play a key role in the control of viral replication. Persistent immune activation is a hallmark of HIV infection and is involved in disease progression independent of viral load. The consequences of Treg expansion, observed in HIV infection, could be either beneficial, by suppressing generalized T-cell activation, or detrimental, by weakening HIV-specific responses and thus contributing to viral persistence. The resulting balance between Tregs contrasting outcomes might have critical implications in pathogenesis. Topics covered in this review include HIV-induced alterations of Tregs, Treg cell dynamics in blood and tissues, Treg-suppressive function, and the relationship between Tregs and immune activation. This review also provides a focus on the role of CD39(+) Tregs and other regulatory cell subsets. All these issues will be explored in different situations including acute and chronic infection, antiretroviral treatment-mediated viral control, and spontaneous viral control. Results must be interpreted with regard to both the Treg definition used in context and to the setting of the disease in an attempt to draw clearer conclusions from the apparently conflicting results.
Collapse
|
35
|
Pinnetti C, Bandera A, Mangioni D, Gori A. Viral, host and therapeutic factors affecting T-cell recovery in virologically controlled HIV patients. Future Virol 2012. [DOI: 10.2217/fvl.12.80] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Despite suppressive combination antiretroviral therapy, a considerable proportion of HIV-infected patients do not achieve adequate immune recovery in terms of the CD4+ T-cell count, although they have controlled viremia values. Many questions remain for clinicians in the management of these patients, defined as immunological nonresponders, including questions about the mechanisms underlying the lack of immune restoration and possible therapeutic approaches to this particular group of patients.
Collapse
Affiliation(s)
- Carmela Pinnetti
- Division of Infectious Diseases, Department of Internal Medicine, ‘San Gerardo’ Hospital, University of Milan-Bicocca, Via Pergolesi 33, 20052 Monza, Milan, Italy
| | - Alessandra Bandera
- Division of Infectious Diseases, Department of Internal Medicine, ‘San Gerardo’ Hospital, University of Milan-Bicocca, Via Pergolesi 33, 20052 Monza, Milan, Italy
| | - Davide Mangioni
- Division of Infectious Diseases, Department of Internal Medicine, ‘San Gerardo’ Hospital, University of Milan-Bicocca, Via Pergolesi 33, 20052 Monza, Milan, Italy
| | - Andrea Gori
- Division of Infectious Diseases, Department of Internal Medicine, ‘San Gerardo’ Hospital, University of Milan-Bicocca, Via Pergolesi 33, 20052 Monza, Milan, Italy
| |
Collapse
|
36
|
Initiation of c-ART in HIV-1 Infected Patients Is Associated With a Decrease of the Metabolic Activity of the Thymus Evaluated Using FDG-PET/Computed Tomography. J Acquir Immune Defic Syndr 2012; 61:56-63. [DOI: 10.1097/qai.0b013e3182615b62] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
37
|
In vitro HIV infection impairs the capacity of myeloid dendritic cells to induce regulatory T cells. PLoS One 2012; 7:e42802. [PMID: 22912740 PMCID: PMC3418294 DOI: 10.1371/journal.pone.0042802] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 07/11/2012] [Indexed: 12/28/2022] Open
Abstract
Myeloid dendritic cells (mDCs) are the antigen-presenting cells best capable of promoting peripheral induction of regulatory T cells (Tregs), and are among the first targets of HIV. It is thus important to understand whether HIV alters their capacity to promote Treg conversion. Monocyte-derived DCs (moDCs) from uninfected donors induced a Treg phenotype (CD25+FOXP3+) in autologous conventional T cells. These converted FOXP3+ cells suppressed the proliferation of responder T cells similarly to circulating Tregs. In contrast, the capacity of moDCs to induce CD25 or FOXP3 was severely impaired by their in vitro infection with CCR5-utilizing virus. MoDC exposure to inactivated HIV was sufficient to impair FOXP3 induction. This DC defect was not dependent on IL-10, TGF-β or other soluble factors, but was due to preferential killing of Tregs by HIV-exposed/infected moDCs, through a caspase-dependent pathway. Importantly, similar results were obtained with circulating primary myeloid DCs. Upon infection in vitro, these mDCs also killed Treg through mechanisms at least partially caspase-dependent, leading to a significantly lower proportion of induced Tregs. Taken together, our data suggest that Treg induction may be defective when DCs are exposed to high levels of virus, such as during the acute phase of infection or in AIDS patients.
Collapse
|
38
|
Abstract
Regulatory T cells (Tregs) play a pivotal role in the maintenance of tolerance as well as in the control of immune activation, particularly during chronic infections. In the setting of HIV infection, the majority of studies have reported an increase in Treg frequency but a decrease in absolute number in all immune compartments of HIV-infected individuals. Several nonexclusive mechanisms have been postulated to explain this preferential Treg accumulation, including peripheral survival, increased proliferation, increased peripheral conversion, and tissue redistribution. The role played by Tregs during HIV infection is still poorly understood, as two opposing hypotheses have been proposed. A detrimental role of Tregs during HIV infection was suggested based on the evidence that Tregs suppress virus-specific immune responses. Conversely, Tregs could be beneficial by limiting immune activation, thus controlling the availability of HIV targets as well as preventing immune-based pathologies. Despite the technical difficulties, getting a better understanding of the mechanisms regulating Treg dynamics remains important, as it will help determine whether we can successfully manipulate Treg function or number to the advantage of the infected host. The aim of this review is thus to discuss the recent findings on Treg homeostasis and function in the setting of HIV infection.
Collapse
|
39
|
Argüello RJ, Balbaryski J, Barboni G, Candi M, Gaddi E, Laucella S. Altered frequency and phenotype of CD4+ forkhead box protein 3+ T cells and its association with autoantibody production in human immunodeficiency virus-infected paediatric patients. Clin Exp Immunol 2012; 168:224-33. [PMID: 22471284 PMCID: PMC3390524 DOI: 10.1111/j.1365-2249.2012.04569.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/19/2012] [Indexed: 11/30/2022] Open
Abstract
The association between immune dysfunction and the development of autoimmune pathology in patients with human immunodeficiency virus/acquired immune deficiency syndrome (HIV/AIDS) is not clear. The frequency and phenotype of regulatory T cells, as well as the presence of autoantibodies, were evaluated in a paediatric cohort of HIV-infected patients without clinical evidence of autoimmune disease. Lower absolute counts but higher percentages of total CD4(+) forkhead box protein 3 (FoxP3)(+) T cells were recorded in children with severe immunosuppression than in those without evidence of immunosuppression. The frequencies of classical CD4(+) CD25(+) FoxP3(+) regulatory T cells were not altered, whereas CD4(+) FoxP3(+) CD25(-) T cells were found increased significantly in patients with severe immunosuppression. Like classical regulatory T cells, CD4(+) FoxP3(+) CD25(-) T cells display higher cytotoxic T-lymphocyte antigen 4 (CTLA-4) but lower CD127 expression compared with CD4(+) FoxP3(-) CD25(+) T cells. An improvement in CD4(+) T cell counts, along with a decrease in viral load, was associated with a decrease in CD4(+) FoxP3(+) CD25(-) T cells. The majority of the patients with severe immunosuppression were positive for at least one out of seven autoantibodies tested and displayed hypergammaglobulinaemia. Conversely, HIV-infected children without evidence of immunosuppression had lower levels of autoantibodies and total immunoglobulins. A decline in CD4(+) FoxP3(+) T cell numbers or a variation in their phenotype may induce a raise in antigen exposure with polyclonal B cell activation, probably contributing to the generation of autoantibodies in the absence of clinical autoimmune disease.
Collapse
Affiliation(s)
- R J Argüello
- Instituto Nacional de Parasitología Dr. Mario Fatala Chabén, Buenos Aires, Argentina
| | | | | | | | | | | |
Collapse
|
40
|
Méndez-Lagares G, Pozo-Balado MM, del Mar del Pozo Balado M, Genebat M, Genebat González M, García Pergañeda A, García Pergañeda Sánchez A, Leal M, Leal Noval M, Pacheco YM, Pacheco López YM. Severe immune dysregulation affects CD4⁺CD25(hi)FoxP3⁺ regulatory T cells in HIV-infected patients with low-level CD4 T-cell repopulation despite suppressive highly active antiretroviral therapy. J Infect Dis 2012; 205:1501-9. [PMID: 22457273 DOI: 10.1093/infdis/jis230] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We hypothesized that CD4(+)CD25(hi)FoxP3(+) regulatory T cells (Tregs) could be involved in the high immune activation existing in patients with low-level CD4 T-cell repopulation under suppressive high active antiretroviral therapy (hereafter, "LLR patients"). Sixteen LLR patients, 18 human immunodeficiency virus (HIV)-infected controls (hereafter, "HIV controls"), and 16 healthy subjects were included. The frequency of CD4(+)CD25(hi)FoxP3(+) and HIV-specific Treg suppressive function were assessed. Relationships between Treg and CD4/CD8 activation (HLA-DR/CD38) and the frequency of naive CD4 T-cells were assessed. Low-level patients showed a higher Treg frequency but reduced HIV-specific immunosuppressive functions than HIV controls. Whereas in healthy subjects a strong negative correlation between Tregs and activated CD8 T cells emerged (r = -0.75, P < .001), it appeared disrupted in both HIV-infected groups (r = -0.06 and P = .83 for LLR patients; r = -0.11 and P = .68 for and HIV controls). Nevertheless, in LLR patients, Tregs negatively correlated with naive CD4 T cells (r = -0.60, P = .01), whereas there was no such correlation in HIV controls (r = -0.19, P = .46) or healthy subjects (r = -0.10, P = .73). Remarkably, a higher ratio of Tregs to naive CD4 T cells was observed in LLR patients than in HIV controls (P = .001) and healthy subjects (P < .001). We conclude that LLR patients have important alterations in immunoregulation involving CD4(+)CD25(hi)FoxP3(+) Tregs. In this scenario, the role of Tregs seems to be more related to the control of the naive CD4 T-cell homeostatic proliferation, rather than to the immune activation.
Collapse
Affiliation(s)
- Gema Méndez-Lagares
- Immunovirology Laboratory, Institute of Biomedicine of Seville, Infectious Diseases Service and Department of Clinical Biochemistry, Virgen del Rocío University Hospital, IBIS/CSIC/University of Seville, Spain
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Myeloid dendritic cells isolated from tissues of SIV-infected Rhesus macaques promote the induction of regulatory T cells. AIDS 2012; 26:263-73. [PMID: 22095196 DOI: 10.1097/qad.0b013e32834ed8df] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To determine whether the ability of primary myeloid dendritic cells (mDCs) to induce regulatory T cells (Treg) is affected by chronic simian immunodeficiency virus (SIV) infection. DESIGN Modulation of dendritic cell activity with the aim of influencing Treg frequency may lead to new treatment options for HIV and strategies for vaccine development. METHODS Eleven chronically infected SIV(+) Rhesus macaques were compared with four uninfected animals. Immature and mature mDCs were isolated from mesenteric lymph nodes and spleen by cell sorting and cultured with purified autologous non-Treg (CD4(+)CD25(-) T cells). CD25 and FOXP3 up-regulation was used to assess Treg induction. RESULTS The frequency of splenic mDC and plasmacytoid dendritic cell was lower in infected animals than in uninfected animals; their frequency in the mesenteric lymph nodes was not significantly altered, but the percentage of mature mDCs was increased in the mesenteric lymph nodes of infected animals. Mature splenic or mesenteric mDCs from infected animals were significantly more efficient at inducing Treg than mDCs from uninfected animals. Mature mDCs from infected macaques induced more conversion than immature mDCs. Splenic mDCs were as efficient as mesenteric mDCs in this context and CD103 expression by mDCs did not appear to influence the level of conversion. CONCLUSIONS Tissue mDCs from SIV-infected animals exhibit an enhanced capability to induce Treg and may contribute to the accumulation of Treg in lymphoid tissues during progressive infection. The activation status of dendritic cell impacts this process but the capacity to induce Treg was not restricted to mucosal dendritic cells in infected animals.
Collapse
|
42
|
Memory and naive-like regulatory CD4+ T cells expand during HIV-2 infection in direct association with CD4+ T-cell depletion irrespectively of viremia. AIDS 2011; 25:1961-70. [PMID: 21811143 DOI: 10.1097/qad.0b013e32834b3554] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The dynamics of CD4(+) regulatory T cells (Treg) during HIV-1 infection remains unclear. To further investigate Treg in this context, we characterized, for the first time, this population in HIV-2-positive individuals. Although both HIV infections are associated with hyperimmune activation and CD4(+) T-cell lymphopenia, most HIV-2-positive individuals display slower disease progression and low-to-undetectable viremia. DESIGN/METHODS Samples were obtained from cohorts of untreated HIV-2-positive and HIV-1-positive, treated HIV-1-positive and seronegative individuals. The proportion of CD4(+) T cells bearing a Treg phenotype, defined in terms of high-level CD25 or Foxp3 expression, was assessed by flow cytometry and correlated with markers of disease progression. The proportions of naive and memory-like subsets as well as cycling cells were determined. RESULTS We observed an increased proportion of Treg, associated with disease progression, as well as increased proportions of cycling (Ki67(+)) memory Treg, in untreated HIV-2-positive and HIV-1-positive individuals. We also noted an expansion of Treg that persisted over time in treated, immunologically discordant HIV-1-positive individuals, who, similarly to HIV-2-positive patients, present undetectable viremia and low CD4 T-cell count. CONCLUSION Overall, we demonstrated that Treg frequency was increased in all lymphopenic HIV-2-positive and HIV-1-positive individuals irrespective of the presence or absence of viremia or antiretroviral treatment. This, in turn, suggests that the observed alterations in Treg frequency in HIV/AIDS are more directly related to the degree of CD4 depletion than to viremia.
Collapse
|
43
|
Nascimbeni M, Pol S, Saunier B. Distinct CD4+ CD8+ double-positive T cells in the blood and liver of patients during chronic hepatitis B and C. PLoS One 2011; 6:e20145. [PMID: 21647449 PMCID: PMC3102078 DOI: 10.1371/journal.pone.0020145] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 04/19/2011] [Indexed: 01/10/2023] Open
Abstract
CD4+ and CD8+ T cells, the main effectors of adaptive cellular immune responses, differentiate from immature, non-functional CD4+CD8+ double-positive T (DPT) cells in the thymus. Increased proportions of circulating DPT lymphocytes have been observed during acute viral infections; in chronic viral diseases, the role and repartition of extra-thymic DPT cells remain largely uncharacterized. We performed a phenotypic analysis of DPT cells in blood and liver from patients chronically infected by hepatitis C (HCV) or B (HBV) viruses. The highest percentages of DPT cells, predominantly CD4highCD8low, were observed in patients infected by HCV, while HBV-infected patients mostly displayed CD4lowCD8high and CD4highCD8high DPT cells. All proportions of DPT cells were higher in liver than in blood with, for each subpopulation referred to above, a correlation between their frequencies in these two compartments. In HCV patients, intra-hepatic DPT cells displayed more heterogeneous activation, differentiation and memory phenotypes than in the blood; most of them expressed CD1a, a marker of T cell development in the thymus. Ex vivo, the inoculation of liver slices with HCV produced in cell culture was accompanied by a disappearance of CD8high cells, suggesting a direct effect of the virus on the phenotype of DPT cells in the liver. Our results suggest that, in half of the patients, chronic HCV infection promotes the production of DPT cells, perhaps by their re-induction in the thymus and selection in the liver.
Collapse
Affiliation(s)
- Michelina Nascimbeni
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
| | - Stanislas Pol
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
- Hepatology Unit of Cochin Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Bertrand Saunier
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
- * E-mail:
| |
Collapse
|
44
|
Février M, Dorgham K, Rebollo A. CD4+ T cell depletion in human immunodeficiency virus (HIV) infection: role of apoptosis. Viruses 2011; 3:586-612. [PMID: 21994747 PMCID: PMC3185763 DOI: 10.3390/v3050586] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 05/03/2011] [Accepted: 05/04/2011] [Indexed: 02/07/2023] Open
Abstract
Human immunodeficiency virus (HIV) infection is principally a mucosal disease and the gastrointestinal (GI) tract is the major site of HIV replication. Loss of CD4+ T cells and systemic immune hyperactivation are the hallmarks of HIV infection. The end of acute infection is associated with the emergence of specific CD4+ and CD8+ T cell responses and the establishment of a chronic phase of infection. Abnormal levels of immune activation and inflammation persist despite a low steady state level of viremia. Although the causes of persistent immune hyperactivation remain incompletely characterized, physiological alterations of gastrointestinal tract probably play a major role. Failure to restore Th17 cells in gut-associated lymphoid tissues (GALT) might impair the recovery of the gut mucosal barrier. This review discusses recent advances on understanding the contribution of CD4+ T cell depletion to HIV pathogenesis.
Collapse
Affiliation(s)
- Michèle Février
- Unité Génomique Virale et Vaccination, CNRS URA3015, Institut Pasteur, 28 rue du Dr Roux, 75015 Paris, France.
| | | | | |
Collapse
|
45
|
Nakanjako D, Ssewanyana I, Mayanja-Kizza H, Kiragga A, Colebunders R, Manabe YC, Nabatanzi R, Kamya MR, Cao H. High T-cell immune activation and immune exhaustion among individuals with suboptimal CD4 recovery after 4 years of antiretroviral therapy in an African cohort. BMC Infect Dis 2011; 11:43. [PMID: 21299909 PMCID: PMC3065409 DOI: 10.1186/1471-2334-11-43] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 02/08/2011] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Antiretroviral therapy (ART) partially corrects immune dysfunction associated with HIV infection. The levels of T-cell immune activation and exhaustion after long-term, suppressive ART and their correlation with CD4 T-cell count reconstitution among ART-treated patients in African cohorts have not been extensively evaluated. METHODS T-cell activation (CD38+HLA-DR+) and immune exhaustion (PD-1+) were measured in a prospective cohort of patients initiated on ART; 128 patient samples were evaluated and subcategorized by CD4 reconstitution after long-term suppressive treatment: Suboptimal [median CD4 count increase 129 (-43-199) cells/μl], N = 34 ], optimal [282 (200-415) cells/μl, N = 64] and super-optimal [528 (416-878) cells/μl, N = 30]. RESULTS Both CD4+ and CD8 T-cell activation was significantly higher among suboptimal CD4 T-cell responders compared to super-optimal responders. In a multivariate model, CD4+CD38+HLADR+ T-cells were associated with suboptimal CD4 reconstitution [AOR, 5.7 (95% CI, 1.4-23, P = 0.014)]. T-cell exhaustion (CD4+PD1+ and CD8+PD1+) was higher among suboptimal relative to optimal (P < 0.001) and super-optimal responders (P < 0.001). T-cell exhaustion was significantly associated with suboptimal responders [AOR, 1.5 (95%CI, 1.1-2.1), P = 0.022]. CONCLUSION T-cell activation and exhaustion persist among HIV-infected patients despite long-term, sustained HIV-RNA viral suppression. These immune abnormalities were associated with suboptimal CD4 reconstitution and their regulation may modify immune recovery among suboptimal responders to ART.
Collapse
Affiliation(s)
- Damalie Nakanjako
- Department of Medicine, Makerere University School of Medicine, Kampala, Uganda
- Infectious Diseases Institute, Makerere University School of Medicine, Kampala, Uganda
| | | | | | - Agnes Kiragga
- Infectious Diseases Institute, Makerere University School of Medicine, Kampala, Uganda
| | - Robert Colebunders
- Institute of Tropical Medicine, Department of Clinical sciences, HIV/STD Unit, Antwerp, Belgium
- Department of Epidemiology and Social Sciences, University of Antwerp, Antwerp, Belgium
| | - Yukari C Manabe
- Infectious Diseases Institute, Makerere University School of Medicine, Kampala, Uganda
| | | | - Moses R Kamya
- Department of Medicine, Makerere University School of Medicine, Kampala, Uganda
| | - Huyen Cao
- California Department of Public Health, Richmond, California 94804, USA
| |
Collapse
|