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1.
Annu Rev Immunol ; 40: 469-498, 2022 04 26.
Article in English | MEDLINE | ID: mdl-35138947

ABSTRACT

Intracellular pathogens pose a significant threat to animals. In defense, innate immune sensors attempt to detect these pathogens using pattern recognition receptors that either directly detect microbial molecules or indirectly detect their pathogenic activity. These sensors trigger different forms of regulated cell death, including pyroptosis, apoptosis, and necroptosis, which eliminate the infected host cell niche while simultaneously promoting beneficial immune responses. These defenses force intracellular pathogens to evolve strategies to minimize or completely evade the sensors. In this review, we discuss recent advances in our understanding of the cytosolic pattern recognition receptors that drive cell death, including NLRP1, NLRP3, NLRP6, NLRP9, NLRC4, AIM2, IFI16, and ZBP1.


Subject(s)
Inflammasomes , Pyroptosis , Animals , Apoptosis , Cell Death , Humans , Inflammasomes/metabolism , Necroptosis
2.
Annu Rev Immunol ; 39: 611-637, 2021 04 26.
Article in English | MEDLINE | ID: mdl-33637017

ABSTRACT

Infection with Mycobacterium tuberculosis causes >1.5 million deaths worldwide annually. Innate immune cells are the first to encounter M. tuberculosis, and their response dictates the course of infection. Dendritic cells (DCs) activate the adaptive response and determine its characteristics. Macrophages are responsible both for exerting cell-intrinsic antimicrobial control and for initiating and maintaining inflammation. The inflammatory response to M. tuberculosis infection is a double-edged sword. While cytokines such as TNF-α and IL-1 are important for protection, either excessive or insufficient cytokine production results in progressive disease. Furthermore, neutrophils-cells normally associated with control of bacterial infection-are emerging as key drivers of a hyperinflammatory response that results in host mortality. The roles of other innate cells, including natural killer cells and innate-like T cells, remain enigmatic. Understanding the nuances of both cell-intrinsic control of infection and regulation of inflammation will be crucial for the successful development of host-targeted therapeutics and vaccines.


Subject(s)
Mycobacterium tuberculosis , Tuberculosis , Animals , Cytokines , Humans , Immunity, Innate , Macrophages
3.
Cell ; 184(19): 4981-4995.e14, 2021 09 16.
Article in English | MEDLINE | ID: mdl-34464586

ABSTRACT

Poor tumor infiltration, development of exhaustion, and antigen insufficiency are common mechanisms that limit chimeric antigen receptor (CAR)-T cell efficacy. Delivery of pattern recognition receptor agonists is one strategy to improve immune function; however, targeting these agonists to immune cells is challenging, and off-target signaling in cancer cells can be detrimental. Here, we engineer CAR-T cells to deliver RN7SL1, an endogenous RNA that activates RIG-I/MDA5 signaling. RN7SL1 promotes expansion and effector-memory differentiation of CAR-T cells. Moreover, RN7SL1 is deployed in extracellular vesicles and selectively transferred to immune cells. Unlike other RNA agonists, transferred RN7SL1 restricts myeloid-derived suppressor cell (MDSC) development, decreases TGFB in myeloid cells, and fosters dendritic cell (DC) subsets with costimulatory features. Consequently, endogenous effector-memory and tumor-specific T cells also expand, allowing rejection of solid tumors with CAR antigen loss. Supported by improved endogenous immunity, CAR-T cells can now co-deploy peptide antigens with RN7SL1 to enhance efficacy, even when heterogenous CAR antigen tumors lack adequate neoantigens.


Subject(s)
Immunologic Factors/pharmacology , RNA/pharmacology , Receptors, Chimeric Antigen/immunology , T-Lymphocytes/immunology , Animals , Antigens/metabolism , CD8-Positive T-Lymphocytes/immunology , Cell Line, Tumor , DEAD Box Protein 58/metabolism , Dendritic Cells/drug effects , Dendritic Cells/metabolism , Extracellular Vesicles/metabolism , Humans , Immunity/drug effects , Immunocompetence , Immunologic Memory , Immunotherapy , Interferons/metabolism , Melanoma, Experimental/pathology , Mice, Inbred C57BL , Myeloid Cells/drug effects , Myeloid Cells/metabolism , Peptides/metabolism , Receptors, Pattern Recognition/metabolism , T-Lymphocytes/drug effects
4.
Cell ; 180(3): 440-453.e18, 2020 02 06.
Article in English | MEDLINE | ID: mdl-32032516

ABSTRACT

Recognition of microbe-associated molecular patterns (MAMPs) is crucial for the plant's immune response. How this sophisticated perception system can be usefully deployed in roots, continuously exposed to microbes, remains a mystery. By analyzing MAMP receptor expression and response at cellular resolution in Arabidopsis, we observed that differentiated outer cell layers show low expression of pattern-recognition receptors (PRRs) and lack MAMP responsiveness. Yet, these cells can be gated to become responsive by neighbor cell damage. Laser ablation of small cell clusters strongly upregulates PRR expression in their vicinity, and elevated receptor expression is sufficient to induce responsiveness in non-responsive cells. Finally, localized damage also leads to immune responses to otherwise non-immunogenic, beneficial bacteria. Damage-gating is overridden by receptor overexpression, which antagonizes colonization. Our findings that cellular damage can "switch on" local immune responses helps to conceptualize how MAMP perception can be used despite the presence of microbial patterns in the soil.


Subject(s)
Arabidopsis/immunology , Plant Diseases/immunology , Plant Diseases/microbiology , Plant Roots/immunology , Receptors, Pattern Recognition/metabolism , Arabidopsis/growth & development , Arabidopsis/microbiology , Arabidopsis/radiation effects , Arabidopsis Proteins/metabolism , Arabidopsis Proteins/radiation effects , Ascorbate Peroxidases/metabolism , Ascorbate Peroxidases/radiation effects , Flagellin/pharmacology , Gene Expression Regulation, Plant/drug effects , Gene Expression Regulation, Plant/radiation effects , Laser Therapy/methods , Membrane Proteins/metabolism , Membrane Proteins/radiation effects , Microscopy, Confocal , Plant Roots/growth & development , Plant Roots/microbiology , Plant Roots/radiation effects , Protein Kinases/metabolism , Protein Kinases/radiation effects , Receptors, Pattern Recognition/radiation effects , Signal Transduction/drug effects , Signal Transduction/radiation effects , Time-Lapse Imaging
5.
Immunity ; 56(10): 2206-2217, 2023 10 10.
Article in English | MEDLINE | ID: mdl-37703879

ABSTRACT

The innate immune system is critical for inducing durable and protective T cell responses to infection and has been increasingly recognized as a target for cancer immunotherapy. In this review, we present a framework wherein distinct innate immune signaling pathways activate five key dendritic cell activities that are important for T cell-mediated immunity. We discuss molecular pathways that can agonize these activities and highlight that no single pathway can agonize all activities needed for durable immunity. The immunological distinctions between innate immunotherapy administration to the tumor microenvironment versus administration via vaccination are examined, with particular focus on the strategies that enhance dendritic cell migration, interferon expression, and interleukin-1 family cytokine production. In this context, we argue for the importance of appreciating necessity vs. sufficiency when considering the impact of innate immune signaling in inflammation and protective immunity and offer a conceptual guideline for the development of efficacious cancer immunotherapies.


Subject(s)
Neoplasms , Humans , Cytokines , Signal Transduction , Immunity, Innate , Immunotherapy , Tumor Microenvironment
6.
Cell ; 170(2): 352-366.e13, 2017 Jul 13.
Article in English | MEDLINE | ID: mdl-28709002

ABSTRACT

Interactions between stromal fibroblasts and cancer cells generate signals for cancer progression, therapy resistance, and inflammatory responses. Although endogenous RNAs acting as damage-associated molecular patterns (DAMPs) for pattern recognition receptors (PRRs) may represent one such signal, these RNAs must remain unrecognized under non-pathological conditions. We show that triggering of stromal NOTCH-MYC by breast cancer cells results in a POL3-driven increase in RN7SL1, an endogenous RNA normally shielded by RNA binding proteins SRP9/14. This increase in RN7SL1 alters its stoichiometry with SRP9/14 and generates unshielded RN7SL1 in stromal exosomes. After exosome transfer to immune cells, unshielded RN7SL1 drives an inflammatory response. Upon transfer to breast cancer cells, unshielded RN7SL1 activates the PRR RIG-I to enhance tumor growth, metastasis, and therapy resistance. Corroborated by evidence from patient tumors and blood, these results demonstrate that regulation of RNA unshielding couples stromal activation with deployment of RNA DAMPs that promote aggressive features of cancer. VIDEO ABSTRACT.


Subject(s)
Breast Neoplasms/pathology , Exosomes/pathology , RNA, Untranslated/metabolism , Stromal Cells/pathology , Tumor Microenvironment , Breast Neoplasms/metabolism , DEAD Box Protein 58/metabolism , Exosomes/metabolism , Humans , Interferon Regulatory Factors/metabolism , MCF-7 Cells , Neoplasm Metastasis , RNA Polymerase III/genetics , RNA Polymerase III/metabolism , Receptors, Immunologic , Receptors, Pattern Recognition/metabolism , Signal Recognition Particle/metabolism , Stromal Cells/metabolism , Virus Diseases/metabolism
7.
Annu Rev Cell Dev Biol ; 34: 357-379, 2018 10 06.
Article in English | MEDLINE | ID: mdl-30095291

ABSTRACT

Microbial nucleic acids are major signatures of invading pathogens, and their recognition by various host pattern recognition receptors (PRRs) represents the first step toward an efficient innate immune response to clear the pathogens. The nucleic acid-sensing PRRs are localized at the plasma membrane, the cytosol, and/or various cellular organelles. Sensing of nucleic acids and signaling by PRRs involve recruitment of distinct signaling components, and PRRs are intensively regulated by cellular organelle trafficking. PRR-mediated innate immune responses are also heavily regulated by posttranslational modifications, including phosphorylation, polyubiquitination, sumoylation, and glutamylation. In this review, we focus on our current understanding of recognition of microbial nucleic acid by PRRs, particularly on their regulation by organelle trafficking and posttranslational modifications. We also discuss how sensing of self nucleic acids and dysregulation of PRR-mediated signaling lead to serious human diseases.


Subject(s)
Host-Pathogen Interactions/genetics , Immunity, Innate/genetics , Nucleic Acids/genetics , Receptors, Pattern Recognition/genetics , Bacteria/genetics , Bacteria/pathogenicity , Cytoplasm/immunology , Cytoplasm/microbiology , DNA, Bacterial/genetics , Host-Pathogen Interactions/immunology , Humans , Nucleic Acids/immunology , Protein Processing, Post-Translational/genetics , Protein Processing, Post-Translational/immunology , Receptors, Pattern Recognition/immunology , Signal Transduction/genetics
8.
Immunity ; 55(5): 847-861.e10, 2022 05 10.
Article in English | MEDLINE | ID: mdl-35545033

ABSTRACT

The microbiota are vital for immune homeostasis and provide a competitive barrier to bacterial and fungal pathogens. Here, we investigated how gut commensals modulate systemic immunity and response to viral infection. Antibiotic suppression of the gut microbiota reduced systemic tonic type I interferon (IFN-I) and antiviral priming. The microbiota-driven tonic IFN-I-response was dependent on cGAS-STING but not on TLR signaling or direct host-bacteria interactions. Instead, membrane vesicles (MVs) from extracellular bacteria activated the cGAS-STING-IFN-I axis by delivering bacterial DNA into distal host cells. DNA-containing MVs from the gut microbiota were found in circulation and promoted the clearance of both DNA (herpes simplex virus type 1) and RNA (vesicular stomatitis virus) viruses in a cGAS-dependent manner. In summary, this study establishes an important role for the microbiota in peripheral cGAS-STING activation, which promotes host resistance to systemic viral infections. Moreover, it uncovers an underappreciated risk of antibiotic use during viral infections.


Subject(s)
Gastrointestinal Microbiome , Herpesvirus 1, Human , Interferon Type I , Virus Diseases , Anti-Bacterial Agents , Antiviral Agents , Humans , Immunity, Innate , Membrane Proteins/genetics , Nucleotidyltransferases/genetics
9.
Cell ; 166(5): 1247-1256.e4, 2016 Aug 25.
Article in English | MEDLINE | ID: mdl-27565347

ABSTRACT

Zika virus (ZIKV) can be transmitted sexually between humans. However, it is unknown whether ZIKV replicates in the vagina and impacts the unborn fetus. Here, we establish a mouse model of vaginal ZIKV infection and demonstrate that, unlike other routes, ZIKV replicates within the genital mucosa even in wild-type (WT) mice. Mice lacking RNA sensors or transcription factors IRF3 and IRF7 resulted in higher levels of local viral replication. Furthermore, mice lacking the type I interferon (IFN) receptor (IFNAR) became viremic and died of infection after a high-dose vaginal ZIKV challenge. Notably, vaginal infection of pregnant dams during early pregnancy led to fetal growth restriction and infection of the fetal brain in WT mice. This was exacerbated in mice deficient in IFN pathways, leading to abortion. Our study highlights the vaginal tract as a highly susceptible site of ZIKV replication and illustrates the dire disease consequences during pregnancy.


Subject(s)
Brain Diseases/virology , Brain/virology , Fetal Growth Retardation/virology , Pregnancy Complications, Infectious/virology , Vagina/virology , Virus Replication , Zika Virus Infection/transmission , Zika Virus/physiology , Abortion, Habitual/virology , Animals , Brain Diseases/immunology , Disease Models, Animal , Female , Fetal Growth Retardation/immunology , Interferon Regulatory Factor-3/genetics , Mice , Mice, Inbred C57BL , Mice, Mutant Strains , Pregnancy , Pregnancy Complications, Infectious/immunology , Receptor, Interferon alpha-beta/genetics
10.
Immunol Rev ; 321(1): 115-127, 2024 Jan.
Article in English | MEDLINE | ID: mdl-37667466

ABSTRACT

Type I interferon (IFN) is a class of proinflammatory cytokines with a dual role on malignant transformation, tumor progression, and response to therapy. On the one hand, robust, acute, and resolving type I IFN responses have been shown to mediate prominent anticancer effects, reflecting not only their direct cytostatic/cytotoxic activity on (at least some) malignant cells, but also their pronounced immunostimulatory functions. In line with this notion, type I IFN signaling has been implicated in the antineoplastic effects of various immunogenic therapeutics, including (but not limited to) immunogenic cell death (ICD)-inducing agents and immune checkpoint inhibitors (ICIs). On the other hand, weak, indolent, and non-resolving type I IFN responses have been demonstrated to support tumor progression and resistance to therapy, reflecting the ability of suboptimal type I IFN signaling to mediate cytoprotective activity, promote stemness, favor tolerance to chromosomal instability, and facilitate the establishment of an immunologically exhausted tumor microenvironment. Here, we review fundamental aspects of type I IFN signaling and their context-dependent impact on malignant transformation, tumor progression, and response to therapy.


Subject(s)
Antineoplastic Agents , Interferon Type I , Neoplasms , Humans , Neoplasms/drug therapy , Antineoplastic Agents/pharmacology , Antineoplastic Agents/therapeutic use , Cytokines , Tumor Microenvironment
11.
Trends Immunol ; 45(5): 358-370, 2024 May.
Article in English | MEDLINE | ID: mdl-38658221

ABSTRACT

Microglia are brain-resident macrophages that play key roles in brain development and experience dependent plasticity. In this review we discuss recent findings regarding the molecular mechanisms through which mammalian microglia sense the unique molecular patterns of the homeostatic brain. We propose that microglial function is acutely controlled in response to 'brain-associated molecular patterns' (BAMPs) that function as indicators of neuronal activity and neural circuit remodeling. A further layer of regulation comes from instructive cytokine cues that define unique microglial functional states. A systematic investigation of the receptors and signaling pathways that mediate these two regulatory axes may begin to define a functional code for microglia-neuron interactions.


Subject(s)
Brain , Microglia , Signal Transduction , Microglia/immunology , Microglia/metabolism , Humans , Animals , Brain/physiology , Cytokines/metabolism , Neurons/metabolism , Neurons/physiology , Neuronal Plasticity , Homeostasis
12.
Trends Immunol ; 44(10): 845-857, 2023 10.
Article in English | MEDLINE | ID: mdl-37684173

ABSTRACT

Adjuvants are essential components of modern vaccines. One general mechanism underlying their immunostimulatory functions is the activation of pattern recognition receptors (PRRs) of innate immune cells. Carbohydrates - as essential signaling molecules on microbial surfaces - are potent PRR agonists and candidate materials for adjuvant design. Here, we summarize the latest trends in developing carbohydrate-containing adjuvants, with fresh opinions on how the physicochemical characteristics of the glycans (e.g., molecular size, assembly status, monosaccharide components, and functional group patterns) affect their adjuvant activities in aiding antigen transport, regulating antigen processing, and enhancing adaptive immune responses. From a translational perspective, we also discuss potential technologies for solving long-lasting challenges in carbohydrate adjuvant design.


Subject(s)
Adaptive Immunity , Vaccines , Humans , Receptors, Pattern Recognition , Adjuvants, Immunologic , Vaccine Development , Carbohydrates , Immunity, Innate
13.
Bioessays ; 46(4): e2300142, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38488673

ABSTRACT

Recent research highlights that inflammatory signaling pathways such as pattern recognition receptor (PRR) signaling and inflammatory cytokine signaling play an important role in both on-demand hematopoiesis as well as steady-state hematopoiesis. Knockout studies have demonstrated the necessity of several distinct pathways in these processes, but often lack information about the contribution of specific cell types to the phenotypes in question. Transplantation studies have increased the resolution to the level of specific cell types by testing the necessity of inflammatory pathways specifically in donor hematopoietic stem and progenitor cells (HSPCs) or in recipient niche cells. Here, we argue that for an integrated understanding of how these processes occur in vivo and to inform the development of therapies that modulate hematopoietic responses, we need studies that knockout inflammatory signaling receptors in a cell-specific manner and compare the phenotypes caused by knockout in individual niche cells versus HSPCs.


Subject(s)
Hematopoietic Stem Cell Transplantation , Hematopoietic Stem Cells , Hematopoiesis/physiology , Signal Transduction , Cell Differentiation , Stem Cell Niche
14.
Immunol Rev ; 311(1): 50-74, 2022 10.
Article in English | MEDLINE | ID: mdl-35672656

ABSTRACT

Fungal infections in the central nervous system (CNS) cause high morbidity and mortality. The frequency of CNS mycosis has increased over the last two decades as more individuals go through immunocompromised conditions for various reasons. Nevertheless, options for clinical interventions for CNS mycoses are still limited. Thus, there is an urgent need to understand the host-pathogen interaction mechanisms in CNS mycoses for developing novel treatments. Although the CNS has been regarded as an immune-privileged site, recent studies demonstrate the critical involvement of immune responses elicited by CNS-resident and CNS-infiltrated cells during fungal infections. In this review, we discuss mechanisms of fungal invasion in the CNS, fungal pathogen detection by CNS-resident cells (microglia, astrocytes, oligodendrocytes, neurons), roles of CNS-infiltrated leukocytes, and host immune responses. We consider that understanding host immune responses in the CNS is crucial for endeavors to develop treatments for CNS mycosis.


Subject(s)
Central Nervous System , Mycoses , Host-Pathogen Interactions , Humans , Immunity
15.
Trends Biochem Sci ; 46(9): 758-771, 2021 09.
Article in English | MEDLINE | ID: mdl-33736931

ABSTRACT

Modified bases act as marks on cellular RNAs so that they can be distinguished from foreign RNAs, reducing innate immune responses to endogenous RNA. In humans, mutations giving reduced levels of one base modification, adenosine-to-inosine deamination, cause a viral infection mimic syndrome, a congenital encephalitis with aberrant interferon induction. These Aicardi-Goutières syndrome 6 mutations affect adenosine deaminase acting on RNA 1 (ADAR1), which generates inosines in endogenous double-stranded (ds)RNA. The inosine base alters dsRNA structure to prevent aberrant activation of antiviral cytosolic helicase RIG-I-like receptors. We review how effects of inosines, ADARs, and other modified bases have been shown to be important in innate immunity and cancer.


Subject(s)
Immunity, Innate , RNA Editing , RNA-Binding Proteins , Adenosine Deaminase/genetics , Adenosine Deaminase/metabolism , Humans , RNA, Double-Stranded , RNA-Binding Proteins/metabolism , Transcriptome
16.
Eur J Immunol ; : e2451092, 2024 Aug 28.
Article in English | MEDLINE | ID: mdl-39194380

ABSTRACT

Dectin-1 is a C-type lectin-receptor involved in sensing fungi by innate immune cells. Encoded by the Clec7a gene, Dectin-1 exists in two major splice isoforms, Dectin-1a and 1b, which differ in the presence of a membrane-proximal stalk domain. As reported previously, this domain determines degradative routes for Dectin-1a and 1b leading to the generation of a stable N-terminal fragment exclusively from Dectin-1a. Here, we narrow down the responsible part of the stalk and demonstrate the stabilisation of the Dectin-1a N-terminal fragment in tetraspanin-enriched microdomains. C57BL/6 and BALB/c mice show divergent Dectin-1 isoform expression patterns, which are caused by a single nucleotide polymorphism in exon 3 of the Clec7a gene, leading to a non-sense Dectin-1a mRNA in C57BL/6 mice. Using backcrossing, we generated mice with the C57BL/6 Clec7a allele on a BALB/c background and compared these to the parental strains. Expression of the C57BL/6 allele leads to the exclusive presence of the Dectin-1b protein. Furthermore, it was associated with higher Dectin-1 mRNA expression, but less Dectin-1 at the cell surface according to flow cytometry. In neutrophils, this altered ROS production induced by Dectin-1 model ligands, while cellular responses in macrophages and dendritic cells were not significantly influenced by the Dectin-1 isoform pattern.

17.
Trends Immunol ; 43(11): 886-900, 2022 11.
Article in English | MEDLINE | ID: mdl-36216719

ABSTRACT

Caloric overconsumption in vertebrates promotes adipose and liver fat accumulation while perturbing the gut microbiome. This triad triggers pattern recognition receptor (PRR)-mediated immune cell signaling and sterile inflammation. Moreover, immune system activation perpetuates metabolic consequences, including the progression of nonalcoholic fatty liver disease (NAFLD) to nonalcoholic hepatic steatohepatitis (NASH). Recent findings show that sensing of nutrient overabundance disrupts the activity and homeostasis of the central cellular energy-generating organelle, the mitochondrion. In parallel, whether caloric excess-initiated PRR signaling and mitochondrial perturbations are coordinated to amplify this inflammatory process in NASH progression remains in question. We hypothesize that altered mitochondrial function, classic PRR signaling, and complement activation in response to nutrient overload together play an integrated role across the immune cell landscape, leading to liver inflammation and NASH progression.


Subject(s)
Non-alcoholic Fatty Liver Disease , Animals , Humans , Non-alcoholic Fatty Liver Disease/metabolism , Liver , Inflammation , Signal Transduction , Mitochondria/metabolism , Nutrients
18.
Mol Cell ; 65(3): 403-415.e8, 2017 Feb 02.
Article in English | MEDLINE | ID: mdl-28132841

ABSTRACT

Cell-autonomous induction of type I interferon must be stringently regulated. Rapid induction is key to control virus infection, whereas proper limitation of signaling is essential to prevent immunopathology and autoimmune disease. Using unbiased kinome-wide RNAi screening followed by thorough validation, we identified 22 factors that regulate RIG-I/IRF3 signaling activity. We describe a negative-feedback mechanism targeting RIG-I activity, which is mediated by death associated protein kinase 1 (DAPK1). RIG-I signaling triggers DAPK1 kinase activation, and active DAPK1 potently inhibits RIG-I stimulated IRF3 activity and interferon-beta production. DAPK1 phosphorylates RIG-I in vitro at previously reported as well as other sites that limit 5'ppp-dsRNA sensing and virtually abrogate RIG-I activation.


Subject(s)
Death-Associated Protein Kinases/metabolism , RNA, Small Interfering/genetics , Receptors, Retinoic Acid/metabolism , A549 Cells , Animals , Cells, Cultured , Feedback, Physiological , HEK293 Cells , Humans , Mice , Phosphorylation , Protein Kinases/metabolism , Signal Transduction
19.
Immunol Rev ; 304(1): 169-180, 2021 11.
Article in English | MEDLINE | ID: mdl-34405413

ABSTRACT

Induction of the antiviral innate immune response is highly regulated at the RNA level, particularly by RNA modifications. Recent discoveries have revealed how RNA modifications play key roles in cellular surveillance of nucleic acids and in controlling gene expression in response to viral infection. These modifications have emerged as being essential for a functional antiviral response and maintaining cellular homeostasis. In this review, we will highlight these and other discoveries that describe how the antiviral response is controlled by modifications to both viral and cellular RNA, focusing on how mRNA cap modifications, N6-methyladenosine, and RNA editing all contribute to coordinating an efficient response that properly controls viral infection.


Subject(s)
Immunity, Innate , Virus Diseases , Adenosine , Antiviral Agents/therapeutic use , Humans , RNA , RNA, Viral/genetics
20.
Med Res Rev ; 44(3): 1267-1325, 2024 05.
Article in English | MEDLINE | ID: mdl-38226452

ABSTRACT

Neuropsychiatric disorders denote a broad range of illnesses involving neurology and psychiatry. These disorders include depressive disorders, anxiety, schizophrenia, bipolar disorder, attention deficit hyperactivity disorder, autism spectrum disorders, headaches, and epilepsy. In addition to their main neuropathology that lies in the central nervous system (CNS), lately, studies have highlighted the role of immunity and neuroinflammation in neuropsychiatric disorders. Toll-like receptors (TLRs) are innate receptors that act as a bridge between the innate and adaptive immune systems via adaptor proteins (e.g., MYD88) and downstream elements; TLRs are classified into 13 families that are involved in normal function and illnesses of the CNS. TLRs expression affects the course of neuropsychiatric disorders, and is influenced during their pharmacotherapy; For example, the expression of multiple TLRs is normalized during the major depressive disorder pharmacotherapy. Here, the role of TLRs in neuroimmunology, treatment, and management of neuropsychiatric disorders is discussed. We recommend longitudinal studies to comparatively assess the cell-type-specific expression of TLRs during treatment, illness progression, and remission. Also, further research should explore molecular insights into TLRs regulation and related pathways.


Subject(s)
Depressive Disorder, Major , Humans , Toll-Like Receptors/metabolism , Central Nervous System , Immunity, Innate
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