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1.
Ann Hematol ; 98(11): 2497-2506, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31595308

RESUMO

Primary immune thrombocytopenia (ITP) is an acquired autoimmune disease characterized by a low platelet count and consequent increased risk of bleeding. The etiology underlying this condition remains poorly understood. The aim of this study is to evaluate the association of a single nucleotide polymorphism (SNP) rs4077515 in the caspase recruitment domain-containing protein 9 (CARD9) gene with the pathogenesis and therapy of ITP. Two hundred ninety-four patients with ITP and 324 age-matched healthy participants were recruited in this case-control study. Genotyping of CARD9 rs4077515 polymorphism was performed by Sanger sequencing. Our results revealed that a polymorphism rs4077515 in CARD9 gene is associated with decreased risk of susceptibility to and severity of ITP (susceptibility: codominant, AA vs. GG, OR = 0.175, 95% CI = 0.054-0.776, p = 0.001; recessive, GG + AG vs. AA, OR = 6.183, 95% CI = 2.287-16.715, p < 0.001; severity: allele, A vs. G, OR = 0.685, 95% CI = 0.476-0.985, p = 0.041; codominant, AG vs. GG, OR = 0.571, 95% CI = 0.350-0.931, p = 0.025; dominant, AA + AG vs. GG, OR = 0.558, 95% CI = 0.343-0.907, p = 0.019). The existence of the allele A, the mutant AA genotype and the heterozygous AG genotype of CARD9 rs4077515, plays a protective role in ITP. However, CARD9 rs4077515 polymorphism had no effect on corticosteroid sensitivity or refractoriness of ITP.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/genética , Polimorfismo de Nucleotídeo Único , Púrpura Trombocitopênica Idiopática/genética , Corticosteroides/uso terapêutico , Adulto , Alelos , Proteínas Adaptadoras de Sinalização CARD/fisiologia , Estudos de Casos e Controles , Resistência a Medicamentos , Feminino , Frequência do Gene , Predisposição Genética para Doença , Genótipo , Humanos , Masculino , Pessoa de Meia-Idade , Púrpura Trombocitopênica Idiopática/tratamento farmacológico , Risco
2.
PLoS Pathog ; 15(8): e1007923, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-31449558

RESUMO

IL-1ß is a potent pro-inflammatory cytokine that promotes immunity and host defense, and its dysregulation is associated with immune pathology. Toxoplasma gondii infection of myeloid cells triggers the production and release of IL-1ß; however, the mechanisms regulating this pathway, particularly in human immune cells, are incompletely understood. We have identified a novel pathway of T. gondii induction of IL-1ß via a Syk-CARD9-NF-κB signaling axis in primary human peripheral blood monocytes. Syk was rapidly phosphorylated during T. gondii infection of primary monocytes, and inhibiting Syk with the pharmacological inhibitors R406 or entospletinib, or genetic ablation of Syk in THP-1 cells, reduced IL-1ß release. Inhibition of Syk in primary cells or deletion of Syk in THP-1 cells decreased parasite-induced IL-1ß transcripts and the production of pro-IL-1ß. Furthermore, inhibition of PKCδ, CARD9/MALT-1 and IKK reduced p65 phosphorylation and pro-IL-1ß production in T. gondii-infected primary monocytes, and genetic knockout of PKCδ or CARD9 in THP-1 cells also reduced pro-IL-1ß protein levels and IL-1ß release during T. gondii infection, indicating that Syk functions upstream of this NF-κB-dependent signaling pathway for IL-1ß transcriptional activation. IL-1ß release from T. gondii-infected primary human monocytes required the NLRP3-caspase-1 inflammasome, but interestingly, was independent of gasdermin D (GSDMD) cleavage and pyroptosis. Moreover, GSDMD knockout THP-1 cells released comparable amounts of IL-1ß to wild-type THP-1 cells after T. gondii infection. Taken together, our data indicate that T. gondii induces a Syk-CARD9/MALT-1-NF-κB signaling pathway and activation of the NLRP3 inflammasome for the release of IL-1ß in a cell death- and GSDMD-independent manner. This research expands our understanding of the molecular basis for human innate immune regulation of inflammation and host defense during parasite infection.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/metabolismo , Interleucina-1beta/metabolismo , Peptídeos e Proteínas de Sinalização Intracelular/metabolismo , Monócitos/metabolismo , NF-kappa B/metabolismo , Proteínas de Ligação a Fosfato/metabolismo , Quinase Syk/metabolismo , Toxoplasmose/metabolismo , Proteínas Adaptadoras de Sinalização CARD/genética , Células Cultivadas , Humanos , Inflamassomos , Peptídeos e Proteínas de Sinalização Intracelular/genética , Monócitos/imunologia , Monócitos/microbiologia , NF-kappa B/genética , Proteínas de Ligação a Fosfato/genética , Transdução de Sinais , Quinase Syk/genética , Toxoplasma/fisiologia , Toxoplasmose/imunologia , Toxoplasmose/microbiologia
3.
Int J Mol Sci ; 20(17)2019 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-31461911

RESUMO

The purpose of this study is to investigate whether nicotinamide riboside (NR) can improve inflammation and cognitive function in diabetic mice. ICR male mice were fed for 14 weeks with either high-fat chow diet (HF, 60% kcal fat) or standard chow diet (CON, 10% kcal fat). HF, streptozotocin, and nicotinamide were used to induce hyperglycemia. NR or vehicle was delivered via stomach gavage for six weeks. Oral glucose tolerance test, Y-maze test, and nest construction test were conducted before and after the NR treatment period. NR treatment induced down-regulation of NLRP3, ASC, and caspase-1. NR reduced IL-1 expression significantly by 50% in whole brains of hyperglycemic mice. Other inflammatory markers including TNF-α and IL-6 were also attenuated by NR. Brain expression of amyloid-ß precursor protein and presenilin 1 were reduced by NR. In addition, NR induced significant reduction of amyloid-ß in whole brains of diabetic mice. NR treatment restored hyperglycemia-induced increases in brain karyopyknosis to the levels of controls. Nest construction test showed that NR improved hippocampus functions. Spatial recognition memory and locomotor activity were also improved by NR supplementation. These findings suggest that NR may be useful for treating cognitive impairment by inhibiting amyloidogenesis and neuroinflammation.


Assuntos
Anti-Inflamatórios/uso terapêutico , Encéfalo/efeitos dos fármacos , Disfunção Cognitiva/tratamento farmacológico , Diabetes Mellitus Experimental/complicações , Niacinamida/análogos & derivados , Animais , Anti-Inflamatórios/farmacologia , Encéfalo/metabolismo , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas Adaptadoras de Sinalização CARD/metabolismo , Caspase 3/genética , Caspase 3/metabolismo , Cognição , Disfunção Cognitiva/etiologia , Interleucina-6/genética , Interleucina-6/metabolismo , Masculino , Aprendizagem em Labirinto , Camundongos , Camundongos Endogâmicos ICR , Proteína 3 que Contém Domínio de Pirina da Família NLR/genética , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Niacinamida/farmacologia , Niacinamida/uso terapêutico , Fator de Necrose Tumoral alfa/metabolismo
4.
Nat Commun ; 10(1): 3493, 2019 08 02.
Artigo em Inglês | MEDLINE | ID: mdl-31375698

RESUMO

Hydrogen peroxide (H2O2) has a major function in host-microbial interactions. Although most studies have focused on the endogenous H2O2 produced by immune cells to kill microbes, bacteria can also produce H2O2. How microbial H2O2 influences the dynamics of host-microbial interactions is unclear. Here we show that H2O2 released by Streptococcus pneumoniae inhibits inflammasomes, key components of the innate immune system, contributing to the pathogen colonization of the host. We also show that the oral commensal H2O2-producing bacteria Streptococcus oralis can block inflammasome activation. This study uncovers an unexpected role of H2O2 in immune suppression and demonstrates how, through this mechanism, bacteria might restrain the immune system to co-exist with the host.


Assuntos
Coinfecção/imunologia , Peróxido de Hidrogênio/metabolismo , Tolerância Imunológica , Imunidade Inata , Inflamassomos/imunologia , Animais , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas Adaptadoras de Sinalização CARD/metabolismo , Coinfecção/microbiologia , Modelos Animais de Doenças , Interações entre Hospedeiro e Microrganismos/imunologia , Humanos , Peróxido de Hidrogênio/imunologia , Inflamassomos/metabolismo , Camundongos , Camundongos Knockout , Streptococcus oralis/imunologia , Streptococcus oralis/metabolismo , Streptococcus oralis/patogenicidade , Streptococcus pneumoniae/imunologia , Streptococcus pneumoniae/metabolismo , Streptococcus pneumoniae/patogenicidade
5.
Nat Commun ; 10(1): 3070, 2019 07 11.
Artigo em Inglês | MEDLINE | ID: mdl-31296852

RESUMO

CARD9 and CARD11 drive immune cell activation by nucleating Bcl10 polymerization, but are held in an autoinhibited state prior to stimulation. Here, we elucidate the structural basis for this autoinhibition by determining the structure of a region of CARD9 that includes an extensive interface between its caspase recruitment domain (CARD) and coiled-coil domain. We demonstrate, for both CARD9 and CARD11, that disruption of this interface leads to hyperactivation in cells and to the formation of Bcl10-templating filaments in vitro, illuminating the mechanism of action of numerous oncogenic mutations of CARD11. These structural insights enable us to characterize two similar, yet distinct, mechanisms by which autoinhibition is relieved in the course of canonical CARD9 or CARD11 activation. We also dissect the molecular determinants of helical template assembly by solving the structure of the CARD9 filament. Taken together, these findings delineate the structural mechanisms of inhibition and activation within this protein family.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/ultraestrutura , Guanilato Ciclase/ultraestrutura , Domínios Proteicos , Proteína 10 de Linfoma CCL de Células B/metabolismo , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas Adaptadoras de Sinalização CARD/imunologia , Proteínas Adaptadoras de Sinalização CARD/metabolismo , Microscopia Crioeletrônica , Guanilato Ciclase/genética , Guanilato Ciclase/imunologia , Guanilato Ciclase/metabolismo , Células HEK293 , Humanos , Mutação , Ressonância Magnética Nuclear Biomolecular , Conformação Proteica em alfa-Hélice , Multimerização Proteica/imunologia , Proteínas Recombinantes/genética , Proteínas Recombinantes/imunologia , Proteínas Recombinantes/metabolismo , Proteínas Recombinantes/ultraestrutura , Transdução de Sinais/imunologia
6.
Pediatr Rheumatol Online J ; 17(1): 38, 2019 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-31286971

RESUMO

BACKGROUND: Autosomal dominant gain of function mutations in caspase recruitment domain family member 14 (CARD14) is a rare condition associated with plaque-type psoriasis, generalized pustular psoriasis, palmoplantar pustular psoriasis and pityriasis rubra pilaris. Recently, a new CARD14 -associated phenotype defined as CAPE (CARD14-associated papulosquamous eruption) with clinical features of both psoriasis and pityriasis rubra pilaris was reported. We describe a family carrying a novel heterozygous mutation in CARD14 gene, with childhood-onset erythrodermic psoriasis requiring an unusual extremely high dose (up to 2 mg/kg every 8 weeks) of ustekinumab to achieve disease remission. CASE PRESENTATION: We describe a large family with three pairs of twins presenting a clinical phenotype characterized by childhood-onset erythrodermic psoriasis; in some family members is also reported psoriatic arthritis. The two probands presented poor clinical response to topic and systemic therapy with antihistamine, steroid, retinoids, cyclosporine and etanercept. After exclusion of the most common genes associated to autoinflammatory diseases (IL36RN, IL1RN, MVK, TNFRSF1A, NLRP3, NLRP12, MEFV, NOD2, PSMB8, PSTPIP1, LPIN2) we approached a new gene search by subjecting to Whole Exome Sequencing (WES) analysis five members of the family. A novel heterozygous mutation (c.446 T > G, leading to the missense amino acid substitution p.L149R) in the exon 4 of the CARD14 gene was identified in all affected members. Increasing dosages (up to 2 mg/kg every 8 weeks) of ustekinumab, a human monoclonal antibody targeting interleukin-12 (IL-12) and interleukin-23 (IL-23), allowed the complete control of the clinical manifestations, with an evident reduction of circulating Th17 and Th22 CD4+ T cell subsets. CONCLUSIONS: We describe the association of mutations of the CARD14 gene with an erythrodermic psoriasis pedigree, underlying the necessity to investigate CARD14 mutations in childhood-onset psoriasis cases and confirming the presence of CARD14 causative mutations also in erythrodermic psoriasis form, as recently reported. Also in pediatric age, ustekinumab represents a powerful therapeutic option for this rare condition, that is usually refractory to other treatments. In young children, high and frequent dosages allowed a complete control of the clinical manifestations without any severe side effects, with a long-term follow-up.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/genética , Fármacos Dermatológicos/uso terapêutico , Mutação com Ganho de Função/genética , Guanilato Ciclase/genética , Proteínas de Membrana/genética , Psoríase/tratamento farmacológico , Psoríase/genética , Ustekinumab/uso terapêutico , Criança , Dermatite Esfoliativa/genética , Feminino , Heterozigoto , Humanos , Masculino , Mutação de Sentido Incorreto/genética , Linhagem , Gêmeos Dizigóticos , Sequenciamento Completo do Exoma
7.
Mycoses ; 62(10): 908-919, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31271673

RESUMO

BACKGROUND: Phaeohyphomycosis is a chronic cutaneous, subcutaneous or systemic mycotic infection caused by various dematiaceous fungi. The diverse clinical manifestations and poor prognosis of phaeohyphomycosis necessitate studies on it to better recognise the disease and improve its management. OBJECTIVES: To investigate the epidemiology, aetiology, diagnosis, treatment and prognosis of phaeohyphomycosis in China over the past 20 years, and to study the first case of phaeohyphomycosis caused by Phialophora americana and the genetic and immunological mechanisms. PATIENTS/METHODS: Clinical and laboratory findings of the case were studied, and the patient's DNA was sequenced for CARD9, followed by immunological studies using patient's PBMCs. Cases of phaeohyphomycosis in China from 1998 to 2018 in both the Chinese and English literature were collected and analysed, including 45 articles and 46 patients. RESULTS: We confirmed the patient holding a homozygous frameshift mutation of CARD9, which led to impairment of pro-inflammatory cytokine production, and lower Th17- and Th22-associated responses upon fungus-specific stimulation. From the literature review, we revealed that the clinical presentations of phaeohyphomycosis were diverse. Diagnoses were established mainly on the basis of histopathology and fungal culture. Oral itraconazole, voriconazole, and posaconazole are the first choices for treatment, and a combination with surgical excision is also recommended. CONCLUSIONS: Our study establishes that obtaining detailed histories is vital for understanding the immune state and that patients with recurrent or chronic phaeohyphomycosis in the absence of known immunodeficiencies should be tested for CARD9 mutations. We hope our findings will aid clinicians in the diagnoses and treatment of such infections.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/genética , Mutação da Fase de Leitura , Proteínas Mutantes/genética , Feoifomicose/diagnóstico , Feoifomicose/patologia , Phialophora/isolamento & purificação , Adolescente , Adulto , Idoso , Antifúngicos/administração & dosagem , Criança , Pré-Escolar , China , Citocinas/metabolismo , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Feoifomicose/tratamento farmacológico , Feoifomicose/epidemiologia , Análise de Sequência de DNA , Linfócitos T/imunologia , Adulto Jovem
8.
Oral Dis ; 25(8): 1886-1896, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31306536

RESUMO

OBJECTIVE: To discover the expression pattern and potential underlying mechanism of the caspase recruitment domain-containing protein 9 (CARD9) in oral squamous cell carcinoma (OSCC). METHODS: Caspase recruitment domain-containing protein 9 expression was detected by qRT-PCR and Western blot in OSCC tissues and cells, and OSCC (CGHNC9 and OECM-1) cell lines were divided into control, NC siRNA, and CARD9 siRNA groups. Then, MTT, flow cytometry, wound-healing, and Transwell assays were carried out to determine the changes in cellular biological characteristics. Immunoblot assay was performed for the expressions of NF-κB pathway. Finally, we constructed the xenograft models in nude mice to validate the in vivo effect of CARD9 siRNA on OSCC cell growth. RESULTS: Caspase recruitment domain-containing protein 9 was upregulated in both OSCC tissues and cells, exhibiting a close relation with major clinicopathological features of OSCC patients. Transfection of CARD9 siRNA inhibited the proliferation, migration, and invasion of OSCC cells with the enhanced cell apoptosis, and meanwhile, CARD9, p-p65/p65, p-IKKα/IKKα, and p-IkBα/IkBα were downregulated. The tumor formation assay on nude mice also suggested that CARD9 siRNA might block the in vivo growth of OSCC cells. CONCLUSION: Caspase recruitment domain-containing protein 9 suppression results in the upregulation of NF-κB pathway with suppressed proliferation, migration, and invasion of OSCC cells and facilitates the apoptosis.


Assuntos
Biomarcadores Tumorais/metabolismo , Proteínas Adaptadoras de Sinalização CARD/genética , Carcinoma de Células Escamosas/patologia , Regulação para Baixo/fisiologia , Neoplasias Bucais/patologia , Proteína Supressora de Tumor p53/metabolismo , Animais , Apoptose , Biomarcadores Tumorais/genética , Carcinoma de Células Escamosas/genética , Carcinoma de Células Escamosas/metabolismo , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Regulação Neoplásica da Expressão Gênica , Humanos , Camundongos , Camundongos Nus , Neoplasias Bucais/genética , Neoplasias Bucais/metabolismo , NF-kappa B
9.
PLoS Genet ; 15(5): e1008144, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-31086376

RESUMO

Long noncoding RNAs (lncRNAs) participate in various biological processes such as apoptosis. The function of lncRNAs is closely correlated with their localization within the cell. While regulatory potential of many lncRNAs has been revealed at specific subcellular location, the biological significance of discrete distribution of an lncRNA in different cellular compartments remains largely unexplored. Here, we identified an lncRNA antisense to the pro-apoptotic gene PYCARD, named PYCARD-AS1, which exhibits a dual nuclear and cytoplasmic distribution and is required for the PYCARD silencing in breast cancer cells. The PYCARD-regulated apoptosis is controlled by PYCARD-AS1; moreover, PYCARD-AS1 regulates apoptosis in a PYCARD-dependent manner, indicating that PYCARD is a critical downstream target of PYCARD-AS1. Mechanistically, PYCARD-AS1 can localize to the PYCARD promoter, where it facilitates DNA methylation and H3K9me2 modification by recruiting the chromatin-suppressor proteins DNMT1 and G9a. Moreover, PYCARD-AS1 and PYCARD mRNA can interact with each other via their 5' overlapping region, leading to inhibition of ribosome assembly in the cytoplasm for PYCARD translation. This study reveals a mechanism whereby an lncRNA works at different cellular compartments to regulate the pro-apoptotic gene PYCARD at both the epigenetic and translational levels, contributing to the PYCARD-regulated apoptosis, and also sheds new light on the role of discretely distributed lncRNAs in diverse biological processes.


Assuntos
Apoptose/genética , Proteínas Adaptadoras de Sinalização CARD/genética , Regulação da Expressão Gênica/genética , Proteínas Reguladoras de Apoptose/genética , Proteínas Adaptadoras de Sinalização CARD/metabolismo , Linhagem Celular , Núcleo Celular/metabolismo , Proliferação de Células , Citoplasma/metabolismo , Metilação de DNA/genética , Epigênese Genética , Epigenômica , Células HEK293 , Humanos , Células MCF-7 , Regiões Promotoras Genéticas/genética , RNA Antissenso/genética , RNA Longo não Codificante/genética , Transdução de Sinais/genética
10.
Biol Pharm Bull ; 42(4): 543-546, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30930414

RESUMO

Hypertension is one risk for atrial fibrillation (AF) and induces cardiac inflammation. Recent evidence indicates that pressure overload-induced ventricular structural remodeling is associated with the activation of nucleotide binding-oligomerization domain (NOD)-like receptor P3 (NLRP3) inflammasomes, including an apoptosis-associated speck-like protein containing a C-terminal caspase recruitment domain (ASC). We hypothesized that NLRP3 inflammasomes are an initial sensor for danger signals in pressure overload-induced atrial remodeling, leading to AF. Transverse aortic constriction (TAC) or a sham procedure was performed in mice deficient for ASC-/- and interleukin-1ß (IL-1ß-/-). One week after the procedure, electrical left atrial burst pacing from the esophagus was performed for 30 s to induce AF. IL-1ß, monocyte chemotactic protein 1 (MCP-1), connective tissue growth factor (CTGF), and collagen 1 gene expression were also examined. The electrical burst pacing induced AF in TAC-operated wild-type (WT) (p < 0.001) and ASC-/- (p < 0.05) mice, compared to no AF in the sham-operated WT and ASC-/- mice, respectively. In contrast, the number of mice in which sustained AF was induced was similar between TAC-operated IL-1ß-/- and sham-operated IL-1ß-/- mice (p > 0.05). The expression of all genes tested was increased in TAC-operated WT and ASC-/- mice compared with sham-operated WT and ASC-/- mouse atria, respectively. CTGF and collagen 1, but not MCP-1, gene expressions were increased in TAC-operated IL-1ß-/- mouse atria compared with sham-operated WT and IL-1ß-/- mouse atria. In contrast, the IL-1ß gene was not detected in either TAC-operated or sham-operated IL-1ß-/- mouse atria. These results suggest that an IL-1ß activation pathway, different from NLRP3 inflammasomes, plays an important role in pressure overload-induced sustained AF.


Assuntos
Fibrilação Atrial/metabolismo , Hipertensão/metabolismo , Interleucina-1beta/metabolismo , Animais , Fibrilação Atrial/genética , Pressão Sanguínea , Proteínas Adaptadoras de Sinalização CARD/genética , Quimiocina CCL2/genética , Átrios do Coração/metabolismo , Hipertensão/genética , Interleucina-1beta/genética , Camundongos Endogâmicos C57BL , Camundongos Knockout , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo
11.
Nat Immunol ; 20(5): 559-570, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30996332

RESUMO

The C-type lectin receptor-Syk (spleen tyrosine kinase) adaptor CARD9 facilitates protective antifungal immunity within the central nervous system (CNS), as human deficiency in CARD9 causes susceptibility to fungus-specific, CNS-targeted infection. CARD9 promotes the recruitment of neutrophils to the fungus-infected CNS, which mediates fungal clearance. In the present study we investigated host and pathogen factors that promote protective neutrophil recruitment during invasion of the CNS by Candida albicans. The cytokine IL-1ß served an essential function in CNS antifungal immunity by driving production of the chemokine CXCL1, which recruited neutrophils expressing the chemokine receptor CXCR2. Neutrophil-recruiting production of IL-1ß and CXCL1 was induced in microglia by the fungus-secreted toxin Candidalysin, in a manner dependent on the kinase p38 and the transcription factor c-Fos. Notably, microglia relied on CARD9 for production of IL-1ß, via both transcriptional regulation of Il1b and inflammasome activation, and of CXCL1 in the fungus-infected CNS. Microglia-specific Card9 deletion impaired the production of IL-1ß and CXCL1 and neutrophil recruitment, and increased fungal proliferation in the CNS. Thus, an intricate network of host-pathogen interactions promotes antifungal immunity in the CNS; this is impaired in human deficiency in CARD9, which leads to fungal disease of the CNS.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/imunologia , Candidíase/imunologia , Quimiocina CXCL1/imunologia , Interleucina-1beta/imunologia , Microglia/imunologia , Neutrófilos/imunologia , Animais , Encéfalo/imunologia , Encéfalo/metabolismo , Encéfalo/microbiologia , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas Adaptadoras de Sinalização CARD/metabolismo , Candida albicans/imunologia , Candida albicans/fisiologia , Candidíase/genética , Candidíase/microbiologia , Quimiocina CXCL1/genética , Quimiocina CXCL1/metabolismo , Citocinas/genética , Citocinas/imunologia , Citocinas/metabolismo , Interações Hospedeiro-Patógeno/imunologia , Inflamassomos/genética , Inflamassomos/imunologia , Inflamassomos/metabolismo , Interleucina-1beta/genética , Interleucina-1beta/metabolismo , Camundongos Knockout , Camundongos Transgênicos , Microglia/metabolismo , Microglia/microbiologia , Infiltração de Neutrófilos/genética , Infiltração de Neutrófilos/imunologia , Neutrófilos/metabolismo , Neutrófilos/microbiologia
14.
Viruses ; 11(3)2019 03 26.
Artigo em Inglês | MEDLINE | ID: mdl-30917612

RESUMO

La Crosse virus (LACV) is a mosquito-transmitted arbovirus and the main cause of virus-mediated neurological diseases in children. To date, little is known about the role of C-type lectin receptors (CLRs)-an important class of pattern recognition receptors-in LACV recognition. DC-SIGN remains the only well-described CLR that recognizes LACV. In this study, we investigated the role of additional CLR/LACV interactions. To this end, we applied a flow-through chromatography method for the purification of LACV to perform an unbiased high-throughput screening of LACV with a CLR-hFc fusion protein library. Interestingly, the CARD9-associated CLRs Mincle, Dectin-1, and Dectin-2 were identified to strongly interact with LACV. Since CARD9 is a common adaptor protein for signaling via Mincle, Dectin-1, and Dectin-2, we performed LACV infection of Mincle-/- and CARD9-/- DCs. Mincle-/- and CARD9-/- DCs produced less amounts of proinflammatory cytokines, namely IL-6 and TNF-α, albeit no reduction of the LACV titer was observed. Together, novel CLR/LACV interactions were identified; however, the Mincle/CARD9 axis plays a limited role in early antiviral responses against LACV.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/imunologia , Encefalite da Califórnia/imunologia , Imunidade Inata , Lectinas Tipo C/imunologia , Proteínas de Membrana/imunologia , Transdução de Sinais/imunologia , Animais , Antivirais , Proteínas Adaptadoras de Sinalização CARD/genética , Citocinas/imunologia , Células Dendríticas/imunologia , Vírus La Crosse/imunologia , Lectinas Tipo C/genética , Proteínas de Membrana/genética , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Células Th17/imunologia
15.
Neonatology ; 115(4): 355-362, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30909283

RESUMO

BACKGROUND: Following birth asphyxia there is a robust inflammatory response. NLRP3 is a receptor of the innate immune system. Upon activation, NLRP3 forms an inflammasome together with ASC and procaspase-1 to mediate release of IL-1ß and IL-18. NLRP3 has previously been shown to be upregulated following neonatal hypoxic-ischemic (HI) brain injury in mice, but with no early effect on brain injury. OBJECTIVE: We aimed to evaluate if deficiency of NLRP3 or ASC protects against neonatal HI brain damage 7 days after hypoxia-ischemia. METHODS: C57BL/6J, NLRP3-/-, and ASC-/- mice were subjected to unilateral common carotid artery ligation followed by hypoxia at P9. Brain infarction, apoptosis, and microglial response were evaluated, as well as total RNA sequencing and examination of plasma levels of systemic proinflammatory cytokines. RESULTS: NLRP3-/- mice showed significantly increased brain infarction volumes compared to wild-type (Wt) mice, while ASC-/- mice showed reduced brain infarction volumes after neonatal hypoxia-ischemia. The amount of activated microglia was increased in NLRP3-/- mice, while decreased in ASC-/- mice compared to Wt mice. Total RNA sequencing showed an impaired inflammatory transcriptional response in the hippocampus of NLRP3-/- mice. Plasma levels of IL-1ß and IL-18 were not affected, but TNF was lower in NLRP3-/- and ASC-/- mice compared to Wt mice. CONCLUSION: ASC deficiency is neuroprotective in neonatal HI brain damage in mice, while NLRP3 deficiency increases brain damage.


Assuntos
Infarto Encefálico/patologia , Encéfalo/patologia , Proteínas Adaptadoras de Sinalização CARD/genética , Hipóxia-Isquemia Encefálica/patologia , Proteína 3 que Contém Domínio de Pirina da Família NLR/genética , Fatores de Necrose Tumoral/sangue , Animais , Animais Recém-Nascidos , Apoptose , Infarto Encefálico/genética , Regulação para Baixo , Hipóxia-Isquemia Encefálica/genética , Interleucina-18/sangue , Interleucina-1beta/sangue , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Microglia/patologia , Análise de Sequência de RNA , Regulação para Cima
16.
Cell Mol Life Sci ; 76(11): 2031-2042, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30877336

RESUMO

Pyroptosis is a caspase-1 or caspase-4/5/11-dependent programmed cell death associated with inflammation, which is initiated by inflammasomes or cytosolic LPS in innate immunity. Sepsis is a life-threatening organ dysfunction caused by an imbalance in the body's response to infection. It is a complex interaction between the pathogen and the host's immune system. Neutrophils play the role of a double-edged sword in sepsis, and a number of studies have previously shown that regulation of neutrophils is the most crucial part of sepsis treatment. Pyroptosis is one of the important forms for neutrophils to function, which is increasingly understood as a host active immune response. There is ample evidence that neutrophil pyroptosis may play an important role in sepsis. In recent years, a breakthrough in pyroptosis research has revealed the main mechanism of pyroptosis. However, the potential value of neutrophil pyroptosis in the treatment of sepsis did not draw enough attention. A literature review was performed on the main mechanism of pyroptosis in sepsis and the potential value of neutrophils pyroptosis in sepsis, which may be suitable targets for sepsis treatment in future.


Assuntos
Infecções Bacterianas/imunologia , Caspases/imunologia , Inflamassomos/imunologia , Neutrófilos/imunologia , Piroptose/imunologia , Sepse/imunologia , Animais , Anti-Inflamatórios/uso terapêutico , Infecções Bacterianas/tratamento farmacológico , Infecções Bacterianas/genética , Infecções Bacterianas/patologia , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas Adaptadoras de Sinalização CARD/imunologia , Caspases/genética , Regulação da Expressão Gênica , Interações Hospedeiro-Patógeno/imunologia , Humanos , Imunidade Inata , Inflamassomos/efeitos dos fármacos , Interleucina-18/genética , Interleucina-18/imunologia , Interleucina-1beta/genética , Interleucina-1beta/imunologia , Lipopolissacarídeos/farmacologia , Neutrófilos/efeitos dos fármacos , Neutrófilos/microbiologia , Piroptose/efeitos dos fármacos , Sepse/tratamento farmacológico , Sepse/genética , Sepse/patologia
17.
Front Immunol ; 10: 130, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30837984

RESUMO

We described for the first time a female patient with the simultaneous presence of two homozygous mutations in MYD88 and CARD9 genes presenting with pyogenic bacterial infections, elevated IgE, and persistent EBV viremia. In addition to defective TLR/IL1R-signaling, we described novel functional alterations into the myeloid compartment. In particular, we demonstrated a defective production of reactive oxygen species exclusively in monocytes upon E. coli stimulation, the inability of immature mono-derived DCs (iDCs) to differentiate into mature DCs (mDCs) and the incapacity of mono-derived macrophages (MDMs) to resolve BCG infection in vitro. Our data do not provide any evidence for digenic inheritance in our patient, but rather for the association of two monogenic disorders. This case illustrates the importance of using next generation sequencing (NGS) to determine the most accurate and early diagnosis in atypical clinical and immunological phenotypes, and with particular concern in consanguineous families. Indeed, besides the increased susceptibility to recurrent invasive pyogenic bacterial infections due to MYD88 deficiency, the identification of CARD9 mutations underline the risk of developing invasive fungal infections emphasizing the careful monitoring for the occurrence of fungal infection and the opportunity of long-term antifungal prophylaxis.


Assuntos
Proteínas Adaptadoras de Sinalização CARD/genética , Células Dendríticas/fisiologia , Infecções por Vírus Epstein-Barr/genética , Herpesvirus Humano 4/fisiologia , Imunoglobulina E/sangue , Macrófagos/imunologia , Mutação/genética , Fator 88 de Diferenciação Mieloide/genética , Viremia/genética , Pré-Escolar , Consanguinidade , Feminino , Sequenciamento de Nucleotídeos em Larga Escala , Homozigoto , Humanos , Linhagem
18.
PLoS Genet ; 15(3): e1008018, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30849075

RESUMO

Several bacteria in the gut microbiota have been shown to be associated with inflammatory bowel disease (IBD), and dozens of IBD genetic variants have been identified in genome-wide association studies. However, the role of the microbiota in the etiology of IBD in terms of host genetic susceptibility remains unclear. Here, we studied the association between four major genetic variants associated with an increased risk of IBD and bacterial taxa in up to 633 IBD cases. We performed systematic screening for associations, identifying and replicating associations between NOD2 variants and two taxa: the Roseburia genus and the Faecalibacterium prausnitzii species. By exploring the overall association patterns between genes and bacteria, we found that IBD risk alleles were significantly enriched for associations concordant with bacteria-IBD associations. To understand the significance of this pattern in terms of the study design and known effects from the literature, we used counterfactual principles to assess the fitness of a few parsimonious gene-bacteria-IBD causal models. Our analyses showed evidence that the disease risk of these genetic variants were likely to be partially mediated by the microbiome. We confirmed these results in extensive simulation studies and sensitivity analyses using the association between NOD2 and F. prausnitzii as a case study.


Assuntos
Microbioma Gastrointestinal/genética , Interações entre Hospedeiro e Microrganismos/genética , Doenças Inflamatórias Intestinais/genética , Doenças Inflamatórias Intestinais/microbiologia , Adulto , Proteínas Adaptadoras de Sinalização CARD/genética , Clostridiales/genética , Clostridiales/isolamento & purificação , Clostridiales/patogenicidade , Faecalibacterium prausnitzii/genética , Faecalibacterium prausnitzii/isolamento & purificação , Faecalibacterium prausnitzii/patogenicidade , Feminino , Estudos de Associação Genética , Predisposição Genética para Doença , Variação Genética , Humanos , Doenças Inflamatórias Intestinais/etiologia , Masculino , Pessoa de Meia-Idade , Modelos Genéticos , Proteína Adaptadora de Sinalização NOD2/genética , Polimorfismo de Nucleotídeo Único
19.
Mediators Inflamm ; 2019: 3273645, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30728751

RESUMO

Chronic inflammation is a pivotal contributor to the liver damage mediated by hepatitis C virus (HCV). The NOD-like receptor, pyrin domain-containing 3 (NLRP3) inflammasome is activated by HCV in both hepatocytes and Kupffer cells. The aim of our study was to investigate the association of nine single-nucleotide polymorphisms in four inflammasome genes (NLRP3, CARD8, IL-1ß, and IL-18) with the susceptibility to HCV infection and outcome of interferon treatment in 201 Egyptian chronic hepatitis C patients and 95 healthy controls. The genotyping was conducted using TaqMan predesigned SNP assay. In the comparative analysis, the CC genotype of the NLRP3 rs1539019 was found to be associated with the lower risk to chronic HCV infection (OR: 0.33, 95% CI: 0.17-0.62). This association was also found for the CA genotype and the A allele of the NLRP3 rs35829419 (OR: 0.18 and 0.22, respectively), in addition to the GG genotype and G allele of IL-18 rs1946518 (OR: 0.55 and 0.61, respectively). In contrast, the AA genotype of the IL-1ß rs1143629 was significantly more frequent in HCV patients (OR: 1.7, 95% CI: 1-2.86). Notably, the frequency of the AA genotype of NLRP3 rs1539019 was significantly higher in patients with lack of response (NR) to the interferon treatment (OR: 1.95, 95% CI: 1-3.7). A similar association was found for both the CC genotype and C allele of the NLRP3 rs35829419 (OR: 2.78 and 2.73, respectively) and for the TT genotype and T allele of CARD8 rs2043211 (OR: 2.64 and 1.54, respectively). Yet, the IL-1ß (rs1143629, rs1143634) and IL-18 (rs187238, rs1946518) polymorphisms did not show any significant association with response to interferon treatment. In conclusion, this study reports, for the first time, the association of genetic variations in NLRP3 with hepatitis C susceptibility and response to treatment in Egyptian patients. However, further large-scale studies are recommended to confirm our findings.


Assuntos
Hepatite C Crônica/genética , Hepatite C Crônica/terapia , Proteína 3 que Contém Domínio de Pirina da Família NLR/genética , Polimorfismo Genético , Adulto , Alelos , Antivirais/uso terapêutico , Proteínas Adaptadoras de Sinalização CARD/genética , Estudos de Casos e Controles , Egito , Feminino , Predisposição Genética para Doença , Genótipo , Humanos , Inflamação , Interleucina-18/genética , Interleucina-1beta/genética , Desequilíbrio de Ligação , Masculino , Proteínas de Neoplasias/genética , Polimorfismo de Nucleotídeo Único , Fatores de Risco
20.
Rheumatol Int ; 39(5): 911-919, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30783801

RESUMO

Systemic autoinflammatory diseases (sAIDs) are a heterogeneous group of disorders, having monogenic inherited forms with overlapping clinical manifestations. More than half of patients do not carry any pathogenic variant in formerly associated disease genes. Here, we report a cross-sectional study on targeted Next-Generation Sequencing (NGS) screening in patients with suspected sAIDs to determine the diagnostic utility of genetic screening. Fifteen autoinflammation/immune-related genes (ADA2-CARD14-IL10RA-LPIN2-MEFV-MVK-NLRC4-NLRP12-NLRP3-NOD2-PLCG2-PSTPIP1-SLC29A3-TMEM173-TNFRSF1A) were used to screen 196 subjects from adult/pediatric clinics, each with an initial clinical suspicion of one or more sAID diagnosis with the exclusion of typical familial Mediterranean fever (FMF) patients. Following the genetic screening, 140 patients (71.4%) were clinically followed-up and re-evaluated. Fifty rare variants in 41 patients (20.9%) were classified as pathogenic or likely pathogenic and 32 of those variants were located on the MEFV gene. We detected pathogenic or likely pathogenic variants compatible with the final diagnoses and inheritance patterns in 14/140 (10%) of patients for the following sAIDs: familial Mediterranean fever (n = 7), deficiency of adenosine deaminase 2 (n = 2), mevalonate kinase deficiency (n = 2), Muckle-Wells syndrome (n = 1), Majeed syndrome (n = 1), and STING-associated vasculopathy with onset in infancy (n = 1). Targeted NGS panels have impact on diagnosing rare monogenic sAIDs for a group of patients. We suggest that MEFV gene screening should be first-tier genetic testing especially in regions with high carrier rates. Clinical utility of multi-gene testing in sAIDs was as low as expected, but extensive genome-wide familial analyses in combination with exome screening would enlighten additional genetic factors causing disease.


Assuntos
Testes Genéticos , Doenças Hereditárias Autoinflamatórias/diagnóstico , Sequenciamento de Nucleotídeos em Larga Escala , Proteínas Adaptadoras de Transdução de Sinal/genética , Adenosina Desaminase/deficiência , Adenosina Desaminase/genética , Adolescente , Adulto , Agamaglobulinemia/diagnóstico , Agamaglobulinemia/genética , Anemia Diseritropoética Congênita/diagnóstico , Anemia Diseritropoética Congênita/genética , Proteínas Adaptadoras de Sinalização CARD/genética , Proteínas de Ligação ao Cálcio/genética , Criança , Pré-Escolar , Síndromes Periódicas Associadas à Criopirina/diagnóstico , Síndromes Periódicas Associadas à Criopirina/genética , Proteínas do Citoesqueleto/genética , Febre Familiar do Mediterrâneo/diagnóstico , Febre Familiar do Mediterrâneo/genética , Feminino , Doenças Hereditárias Autoinflamatórias/genética , Humanos , Síndromes de Imunodeficiência/diagnóstico , Síndromes de Imunodeficiência/genética , Peptídeos e Proteínas de Sinalização Intercelular/genética , Masculino , Deficiência de Mevalonato Quinase/diagnóstico , Deficiência de Mevalonato Quinase/genética , Pessoa de Meia-Idade , Proteínas de Transporte de Nucleosídeos/genética , Osteomielite/diagnóstico , Osteomielite/genética , Fosfotransferases (Aceptor do Grupo Álcool)/genética , Pirina/genética , Análise de Sequência de DNA , Imunodeficiência Combinada Severa/diagnóstico , Imunodeficiência Combinada Severa/genética , Adulto Jovem
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