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1.
Annu Rev Immunol ; 42(1): 235-258, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38271641

RESUMO

The choice of developing thymocytes to become CD8+ cytotoxic or CD4+ helper T cells has been intensely studied, but many of the underlying mechanisms remain to be elucidated. Recent multiomics approaches have provided much higher resolution analysis of gene expression in developing thymocytes than was previously achievable, thereby offering a fresh perspective on this question. Focusing on our recent studies using CITE-seq (cellular indexing of transcriptomes and epitopes) analyses of mouse thymocytes, we present a detailed timeline of RNA and protein expression changes during CD8 versus CD4 T cell differentiation. We also revisit our current understanding of the links between T cell receptor signaling and expression of the lineage-defining transcription factors ThPOK and RUNX3. Finally, we propose a sequential selection model to explain the tight linkage between MHC-I versus MHC-II recognition and T cell lineage choice. This model incorporates key aspects of previously proposed kinetic signaling, instructive, and stochastic/selection models.


Assuntos
Linfócitos T CD4-Positivos , Linfócitos T CD8-Positivos , Diferenciação Celular , Linhagem da Célula , Animais , Linfócitos T CD8-Positivos/imunologia , Linfócitos T CD8-Positivos/metabolismo , Humanos , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Receptores de Antígenos de Linfócitos T/metabolismo , Transdução de Sinais , Subunidade alfa 3 de Fator de Ligação ao Core/metabolismo , Subunidade alfa 3 de Fator de Ligação ao Core/genética , Camundongos , Fatores de Transcrição/metabolismo , Transcriptoma , Multiômica
2.
Annu Rev Immunol ; 42(1): 551-584, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38941604

RESUMO

Poxviruses have evolved a wide array of mechanisms to evade the immune response, and we provide an overview of the different immunomodulatory strategies. Poxviruses prevent the recognition of viral DNA that triggers the immune responses and inhibit signaling pathways within the infected cell. A unique feature of poxviruses is the production of secreted proteins that mimic cytokines and cytokine receptors, acting as decoy receptors to neutralize the activity of cytokines and chemokines. The capacity of these proteins to evade cellular immune responses by inhibiting cytokine activation is complemented by poxviruses' strategies to block natural killer cells and cytotoxic T cells, often through interfering with antigen presentation pathways. Mechanisms that target complement activation are also encoded by poxviruses. Virus-encoded proteins that target immune molecules and pathways play a major role in immune modulation, and their contribution to viral pathogenesis, facilitating virus replication or preventing immunopathology, is discussed.


Assuntos
Evasão da Resposta Imune , Infecções por Poxviridae , Poxviridae , Humanos , Poxviridae/imunologia , Poxviridae/fisiologia , Animais , Infecções por Poxviridae/imunologia , Citocinas/metabolismo , Transdução de Sinais , Proteínas Virais/metabolismo , Proteínas Virais/imunologia , Apresentação de Antígeno/imunologia , Interações Hospedeiro-Patógeno/imunologia
3.
Annu Rev Immunol ; 42(1): 521-550, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38382538

RESUMO

Immune checkpoint blockade (ICB) induces a remarkable and durable response in a subset of cancer patients. However, most patients exhibit either primary or acquired resistance to ICB. This resistance arises from a complex interplay of diverse dynamic mechanisms within the tumor microenvironment (TME). These mechanisms include genetic, epigenetic, and metabolic alterations that prevent T cell trafficking to the tumor site, induce immune cell dysfunction, interfere with antigen presentation, drive heightened expression of coinhibitory molecules, and promote tumor survival after immune attack. The TME worsens ICB resistance through the formation of immunosuppressive networks via immune inhibition, regulatory metabolites, and abnormal resource consumption. Finally, patient lifestyle factors, including obesity and microbiome composition, influence ICB resistance. Understanding the heterogeneity of cellular, molecular, and environmental factors contributing to ICB resistance is crucial to develop targeted therapeutic interventions that enhance the clinical response. This comprehensive overview highlights key mechanisms of ICB resistance that may be clinically translatable.


Assuntos
Resistencia a Medicamentos Antineoplásicos , Inibidores de Checkpoint Imunológico , Imunoterapia , Neoplasias , Microambiente Tumoral , Humanos , Microambiente Tumoral/imunologia , Neoplasias/imunologia , Neoplasias/terapia , Neoplasias/metabolismo , Neoplasias/etiologia , Resistencia a Medicamentos Antineoplásicos/imunologia , Animais , Imunoterapia/métodos , Inibidores de Checkpoint Imunológico/uso terapêutico , Inibidores de Checkpoint Imunológico/farmacologia , Epigênese Genética
4.
Annu Rev Immunol ; 42(1): 615-645, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38941608

RESUMO

The COVID-19 pandemic was caused by the recently emerged ß-coronavirus SARS-CoV-2. SARS-CoV-2 has had a catastrophic impact, resulting in nearly 7 million fatalities worldwide to date. The innate immune system is the first line of defense against infections, including the detection and response to SARS-CoV-2. Here, we discuss the innate immune mechanisms that sense coronaviruses, with a focus on SARS-CoV-2 infection and how these protective responses can become detrimental in severe cases of COVID-19, contributing to cytokine storm, inflammation, long-COVID, and other complications. We also highlight the complex cross talk among cytokines and the cellular components of the innate immune system, which can aid in viral clearance but also contribute to inflammatory cell death, cytokine storm, and organ damage in severe COVID-19 pathogenesis. Furthermore, we discuss how SARS-CoV-2 evades key protective innate immune mechanisms to enhance its virulence and pathogenicity, as well as how innate immunity can be therapeutically targeted as part of the vaccination and treatment strategy. Overall, we highlight how a comprehensive understanding of innate immune mechanisms has been crucial in the fight against SARS-CoV-2 infections and the development of novel host-directed immunotherapeutic strategies for various diseases.


Assuntos
COVID-19 , Imunidade Inata , SARS-CoV-2 , Humanos , COVID-19/imunologia , SARS-CoV-2/imunologia , SARS-CoV-2/fisiologia , Síndrome da Liberação de Citocina/imunologia , Citocinas/metabolismo , Animais , Infecções por Coronavirus/imunologia , Infecções por Coronavirus/virologia , Infecções por Coronavirus/prevenção & controle , Evasão da Resposta Imune
5.
Annu Rev Immunol ; 41: 533-560, 2023 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-36854182

RESUMO

Autoreactive B cells and interferons are central players in systemic lupus erythematosus (SLE) pathogenesis. The partial success of drugs targeting these pathways, however, supports heterogeneity in upstream mechanisms contributing to disease pathogenesis. In this review, we focus on recent insights from genetic and immune monitoring studies of patients that are refining our understanding of these basic mechanisms. Among them, novel mutations in genes affecting intrinsic B cell activation or clearance of interferogenic nucleic acids have been described. Mitochondria have emerged as relevant inducers and/or amplifiers of SLE pathogenesis through a variety of mechanisms that include disruption of organelle integrity or compartmentalization, defective metabolism, and failure of quality control measures. These result in extra- or intracellular release of interferogenic nucleic acids as well as in innate and/or adaptive immune cell activation. A variety of classic and novel SLE autoantibody specificities have been found to recapitulate genetic alterations associated with monogenic lupus or to trigger interferogenic amplification loops. Finally, atypical B cells and novel extrafollicular T helper cell subsets have been proposed to contribute to the generation of SLE autoantibodies. Overall, these novel insights provide opportunities to deepen the immunophenotypic surveillance of patients and open the door to patient stratification and personalized, rational approaches to therapy.


Assuntos
Interferons , Lúpus Eritematoso Sistêmico , Humanos , Animais , Interferons/uso terapêutico , Linfócitos B , Linfócitos T Auxiliares-Indutores , Autoanticorpos
6.
Annu Rev Immunol ; 41: 405-429, 2023 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-36750316

RESUMO

Maintaining the correct number of healthy red blood cells (RBCs) is critical for proper oxygenation of tissues throughout the body. Therefore, RBC homeostasis is a tightly controlled balance between RBC production and RBC clearance, through the processes of erythropoiesis and macrophage hemophagocytosis, respectively. However, during the inflammation associated with infectious, autoimmune, or inflammatory diseases this homeostatic process is often dysregulated, leading to acute or chronic anemia. In each disease setting, multiple mechanisms typically contribute to the development of inflammatory anemia, impinging on both sides of the RBC production and RBC clearance equation. These mechanisms include both direct and indirect effects of inflammatory cytokines and innate sensing. Here, we focus on common innate and adaptive immune mechanisms that contribute to inflammatory anemias using examples from several diseases, including hemophagocytic lymphohistiocytosis/macrophage activation syndrome, severe malarial anemia during Plasmodium infection, and systemic lupus erythematosus, among others.


Assuntos
Anemia , Malária , Humanos , Animais , Anemia/complicações , Eritropoese/fisiologia , Eritrócitos , Malária/complicações , Macrófagos
7.
Annu Rev Immunol ; 41: 483-512, 2023 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-36750317

RESUMO

Transforming growth factor ß (TGF-ß) is a key cytokine regulating the development, activation, proliferation, differentiation, and death of T cells. In CD4+ T cells, TGF-ß maintains the quiescence and controls the activation of naive T cells. While inhibiting the differentiation and function of Th1 and Th2 cells, TGF-ß promotes the differentiation of Th17 and Th9 cells. TGF-ß is required for the induction of Foxp3 in naive T cells and the development of regulatory T cells. TGF-ß is crucial in the differentiation of tissue-resident memory CD8+ T cells and their retention in the tissue, whereas it suppresses effector T cell function. In addition, TGF-ß also regulates the generation or function of natural killer T cells, γδ T cells, innate lymphoid cells, and gut intraepithelial lymphocytes. Here I highlight the major findings and recent advances in our understanding of TGF-ß regulation of T cells and provide a personal perspective of the field.


Assuntos
Linfócitos T CD8-Positivos , Fator de Crescimento Transformador beta1 , Animais , Humanos , Diferenciação Celular , Imunidade Inata , Linfócitos/metabolismo , Linfócitos T Reguladores/metabolismo , Fator de Crescimento Transformador beta1/metabolismo
8.
Annu Rev Immunol ; 40: 1-14, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-34871102

RESUMO

I've had serious misgivings about writing this article, because from living the experience day by day, it's hard to believe my accomplishments merit the attention. To skirt this roadblock, I forced myself to pretend I was in a conversation with my trainees, trying to distill the central driving forces of my career in science. The below chronicles my evolution from would-be astronaut/ballerina to budding developmental biologist to devoted T cell immunologist. It traces my work from a focus on intrathymic events that mold developing T cells into self-major histocompatibility complex (MHC)-restricted lymphocytes to extrathymic events that fine-tune the T cell receptor (TCR) repertoire and impose the finishing touches on T cell maturation. It is a story of a few personal attributes multiplied by generous mentors, good luck, hard work, perseverance, and knowing when to step down.


Assuntos
Complexo Principal de Histocompatibilidade , Linfócitos T , Animais , Diferenciação Celular , Humanos , Timo
9.
Annu Rev Immunol ; 40: 413-442, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-35113731

RESUMO

Germinal centers (GCs) are microanatomical sites of B cell clonal expansion and antibody affinity maturation. Therein, B cells undergo the Darwinian process of somatic diversification and affinity-driven selection of immunoglobulins that produces the high-affinity antibodies essential for effective humoral immunity. Here, we review recent developments in the field of GC biology, primarily as it pertains to GCs induced by infection or immunization. First, we summarize the phenotype and function of the different cell types that compose the GC, focusing on GC B cells. Then, we review the cellular and molecular bases of affinity-dependent selection within the GC and the export of memory and plasma cells. Finally, we present an overview of the emerging field of GC clonal dynamics, focusing on how GC and post-GC selection shapes the diversity of antibodies secreted into serum.


Assuntos
Linfócitos B , Centro Germinativo , Animais , Anticorpos , Afinidade de Anticorpos , Humanos , Imunidade Humoral
10.
Annu Rev Immunol ; 40: 169-193, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-35044794

RESUMO

The tumor microenvironment (TME) is a heterogeneous, complex organization composed of tumor, stroma, and endothelial cells that is characterized by cross talk between tumor and innate and adaptive immune cells. Over the last decade, it has become increasingly clear that the immune cells in the TME play a critical role in controlling or promoting tumor growth. The function of T lymphocytes in this process has been well characterized. On the other hand, the function of B lymphocytes is less clear, although recent data from our group and others have strongly indicated a critical role for B cells in antitumor immunity. There are, however, a multitude of populations of B cells found within the TME, ranging from naive B cells all the way to terminally differentiated plasma cells and memory B cells. Here, we characterize the role of B cells in the TME in both animal models and patients, with an emphasis on dissecting how B cell heterogeneity contributes to the immune response to cancer.


Assuntos
Neoplasias , Microambiente Tumoral , Animais , Linfócitos B , Células Endoteliais , Humanos , Linfócitos T
11.
Annu Rev Immunol ; 40: 95-119, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-35471838

RESUMO

A high diversity of αß T cell receptors (TCRs), capable of recognizing virtually any pathogen but also self-antigens, is generated during T cell development in the thymus. Nevertheless, a strict developmental program supports the selection of a self-tolerant T cell repertoire capable of responding to foreign antigens. The steps of T cell selection are controlled by cortical and medullary stromal niches, mainly composed of thymic epithelial cells and dendritic cells. The integration of important cues provided by these specialized niches, including (a) the TCR signal strength induced by the recognition of self-peptide-MHC complexes, (b) costimulatory signals, and (c) cytokine signals, critically controls T cell repertoire selection. This review discusses our current understanding of the signals that coordinate positive selection, negative selection, and agonist selection of Foxp3+ regulatory T cells. It also highlights recent advances that have unraveled the functional diversity of thymic antigen-presenting cell subsets implicated in T cell selection.


Assuntos
Sinais (Psicologia) , Receptores de Antígenos de Linfócitos T , Animais , Humanos , Ativação Linfocitária , Receptores de Antígenos de Linfócitos T/genética , Transdução de Sinais , Linfócitos T Reguladores
12.
Annu Rev Immunol ; 39: 449-479, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33902310

RESUMO

The immune system has coevolved with extensive microbial communities living on barrier sites that are collectively known as the microbiota. It is increasingly clear that microbial antigens and metabolites engage in a constant dialogue with the immune system, leading to microbiota-specific immune responses that occur in the absence of inflammation. This form of homeostatic immunity encompasses many arms of immunity, including B cell responses, innate-like T cells, and conventional T helper and T regulatory responses. In this review we summarize known examples of innate-like T cell and adaptive immunity to the microbiota, focusing on fundamental aspects of commensal immune recognition across different barrier sites. Furthermore, we explore how this cross talk is established during development, emphasizing critical temporal windows that establish long-term immune function. Finally, we highlight how dysregulation of immunity to the microbiota can lead to inflammation and disease, and we pinpoint outstanding questions and controversies regarding immune system-microbiota interactions.


Assuntos
Microbiota , Imunidade Adaptativa , Animais , Linfócitos B , Humanos , Imunidade Inata , Linfócitos T
13.
Annu Rev Immunol ; 39: 583-609, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33637019

RESUMO

Understanding tumor immune microenvironments is critical for identifying immune modifiers of cancer progression and developing cancer immunotherapies. Recent applications of single-cell RNA sequencing (scRNA-seq) in dissecting tumor microenvironments have brought important insights into the biology of tumor-infiltrating immune cells, including their heterogeneity, dynamics, and potential roles in both disease progression and response to immune checkpoint inhibitors and other immunotherapies. This review focuses on the advances in knowledge of tumor immune microenvironments acquired from scRNA-seq studies across multiple types of human tumors, with a particular emphasis on the study of phenotypic plasticity and lineage dynamics of immune cells in the tumor environment. We also discuss several imminent questions emerging from scRNA-seq observations and their potential solutions on the horizon.


Assuntos
Neoplasias , Análise de Célula Única , Animais , Humanos , Imunoterapia , Neoplasias/terapia , Análise de Sequência de RNA , Microambiente Tumoral
14.
Annu Rev Immunol ; 39: 77-101, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33441019

RESUMO

Nearly all animal cells contain proteins evolved to trigger the destruction of the cell in which they reside. The activation of these proteins occurs via sequential programs, and much effort has been expended in delineating the molecular mechanisms underlying the resulting processes of programmed cell death (PCD). These efforts have led to the definition of apoptosis as a form of nonimmunogenic PCD that is required for normal development and tissue homeostasis, and of pyroptosis and necroptosis as forms of PCD initiated by pathogen infection that are associated with inflammation and immune activation. While this paradigm has served the field well, numerous recent studies have highlighted cross talk between these programs, challenging the idea that apoptosis, pyroptosis, and necroptosis are linear pathways with defined immunological outputs. Here, we discuss the emerging idea of cell death as a signaling network, considering connections between cell death pathways both as we observe them now and in their evolutionary origins. We also discuss the engagement and subversion of cell death pathways by pathogens, as well as the key immunological outcomes of these processes.


Assuntos
Necroptose , Piroptose , Animais , Apoptose , Humanos , Inflamação , Transdução de Sinais
15.
Annu Rev Immunol ; 39: 791-817, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33902311

RESUMO

Programmed cell death (PCD) is a requisite feature of development and homeostasis but can also be indicative of infections, injuries, and pathologies. In concordance with these heterogeneous contexts, an array of disparate effector responses occur downstream of cell death and its clearance-spanning tissue morphogenesis, homeostatic turnover, host defense, active dampening of inflammation, and tissue repair. This raises a fundamental question of how a single contextually appropriate response ensues after an event of PCD. To explore how complex inputs may together tailor the specificity of the resulting effector response, here we consider (a) the varying contexts during which different cell death modalities are observed, (b) the nature of the information that can be passed on by cell corpses, and (c) the ways by which efferocyte populations synthesize signals from dying cells with those from the surrounding microenvironment.


Assuntos
Apoptose , Animais , Morte Celular , Homeostase , Humanos
16.
Annu Rev Immunol ; 39: 251-277, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33556248

RESUMO

The immune system of the central nervous system (CNS) consists primarily of innate immune cells. These are highly specialized macrophages found either in the parenchyma, called microglia, or at the CNS interfaces, such as leptomeningeal, perivascular, and choroid plexus macrophages. While they were primarily thought of as phagocytes, their function extends well beyond simple removal of cell debris during development and diseases. Brain-resident innate immune cells were found to be plastic, long-lived, and host to an outstanding number of risk genes for multiple pathologies. As a result, they are now considered the most suitable targets for modulating CNS diseases. Additionally, recent single-cell technologies enhanced our molecular understanding of their origins, fates, interactomes, and functional cell statesduring health and perturbation. Here, we review the current state of our understanding and challenges of the myeloid cell biology in the CNS and treatment options for related diseases.


Assuntos
Sistema Nervoso Central , Microglia , Animais , Encéfalo , Humanos , Macrófagos , Células Mieloides
17.
Annu Rev Immunol ; 39: 103-129, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33472004

RESUMO

B cell subsets differ in development, tissue distribution, and mechanisms of activation. In response to infections, however, all can differentiate into extrafollicular plasmablasts that rapidly provide highly protective antibodies, indicating that these plasmablasts are the main humoral immune response effectors. Yet, the effectiveness of this response type depends on the presence of antigen-specific precursors in the circulating mature B cell pool, a pool that is generated initially through the stochastic processes of B cell receptor assembly. Importantly, germinal centers then mold the repertoire of this B cell pool to be increasingly responsive to pathogens by generating a broad array of antimicrobial memory B cells that act as highly effective precursors of extrafollicular plasmablasts. Such B cell repertoire molding occurs in two ways: continuously via the chronic germinal centers of mucosal lymphoid tissues, driven by the presence of the microbiome, and via de novo generated germinal centers following acute infections. For effectively evaluating humoral immunity as a correlate of immune protection, it might be critical to measure memory B cell pools in addition to antibody titers.


Assuntos
Subpopulações de Linfócitos B , Linfócitos B , Animais , Centro Germinativo , Humanos , Imunidade Humoral , Receptores de Antígenos de Linfócitos B
18.
Annu Rev Immunol ; 39: 417-447, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33902312

RESUMO

Natural killer (NK) cells are innate lymphocytes that provide critical host defense against pathogens and cancer. Originally heralded for their early and rapid effector activity, NK cells have been recognized over the last decade for their ability to undergo adaptive immune processes, including antigen-driven clonal expansion and generation of long-lived memory. This review presents an overview of how NK cells lithely partake in both innate and adaptive responses and how this versatility is manifest in human NK cell-mediated immunity.


Assuntos
Infecções por Citomegalovirus , Citomegalovirus , Animais , Humanos , Imunidade Celular , Células Matadoras Naturais
19.
Annu Rev Immunol ; 39: 279-311, 2021 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-33544645

RESUMO

The innate immune response is a rapid response to pathogens or danger signals. It is precisely activated not only to efficiently eliminate pathogens but also to avoid excessive inflammation and tissue damage. cis-Regulatory element-associated chromatin architecture shaped by epigenetic factors, which we define as the epiregulome, endows innate immune cells with specialized phenotypes and unique functions by establishing cell-specific gene expression patterns, and it also contributes to resolution of the inflammatory response. In this review, we focus on two aspects: (a) how niche signals during lineage commitment or following infection and pathogenic stress program epiregulomes by regulating gene expression levels, enzymatic activities, or gene-specific targeting of chromatin modifiers and (b) how the programed epiregulomes in turn mediate regulation of gene-specific expression, which contributes to controlling the development of innate cells, or the response to infection and inflammation, in a timely manner. We also discuss the effects of innate immunometabolic rewiring on epiregulomes and speculate on several future challenges to be encountered during the exploration of the master regulators of epiregulomes in innate immunity and inflammation.


Assuntos
Imunidade Inata , Inflamação , Animais , Epigênese Genética , Humanos , Imunidade Inata/genética , Inflamação/genética
20.
Annu Rev Immunol ; 38: 705-725, 2020 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-32340571

RESUMO

The discovery of CD4+ T cell subset-defining master transcription factors and framing of the Th1/Th2 paradigm ignited the CD4+ T cell field. Advances in in vivo experimental systems, however, have revealed that more complex lineage-defining transcriptional networks direct CD4+ T cell differentiation in the lymphoid organs and tissues. This review focuses on the layers of fate decisions that inform CD4+ T cell differentiation in vivo. Cytokine production by antigen-presenting cells and other innate cells influences the CD4+ T cell effector program [e.g., T helper type 1 (Th1), Th2, Th17]. Signals downstream of the T cell receptor influence whether individual clones bearing hallmarks of this effector program become T follicular helper cells, supporting development of B cells expressing specific antibody isotypes, or T effector cells, which activate microbicidal innate cells in tissues. These bifurcated, parallel axes allow CD4+ T cells to augment their particular effector program and prevent disease.


Assuntos
Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Diferenciação Celular/imunologia , Animais , Linfócitos B/imunologia , Linfócitos B/metabolismo , Linfócitos T CD4-Positivos/citologia , Diferenciação Celular/genética , Citocinas/metabolismo , Humanos , Ativação Linfocitária/imunologia , Receptores de Antígenos de Linfócitos T/metabolismo , Subpopulações de Linfócitos T/imunologia , Subpopulações de Linfócitos T/metabolismo , Células Th1/imunologia , Células Th1/metabolismo , Células Th2/imunologia , Células Th2/metabolismo
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