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1.
Parasite Immunol ; 44(9): e12938, 2022 09.
Artigo em Inglês | MEDLINE | ID: mdl-35689825

RESUMO

The chemokine receptor CCR7 is a well-established homing receptor for dendritic cells (DCs) and T-cells. Interaction with the CCL19 and CCL21 ligands promotes priming of immune responses in lymphoid tissues; however, the mechanism underlying CCR7-induced immune responses against helminth parasite infection remains unknown. Thus, we examined the role of CCR7 in generating protective immune responses against intracellular Trichinella spiralis infection. The results showed significantly increased CCR7, CCL19 and CCL21 expression in the muscle tissue compared to that in the intestinal tissue in T. spiralis-infected mice. The CCR7-expressing DC population increased in the mesenteric and peripheral lymph nodes (PLNs) during T. spiralis infection. Notably, the number of CCR7-expressing cells in PLNs increased by more than 30% at 28 days post-infection; however, this increase was significantly inhibited in CCR7-blocked mice treated with CCR7-specific antibodies. T helper 2 (Th2)-and regulatory T (Treg )-related cytokine levels were also reduced by CCR7-specific antibody treatment. CCR7-blocked mice lost their resistance to T. spiralis infection in the muscle phase but not in the intestinal phase. Furthermore, fewer eosinophils around the nurse cells and reduced total and T. spiralis-specific IgE in the serum were observed in CCR7-blocked mice compared to those infected with only T. spiralis. CCR7 blockade led to the T. spiralis infection-induced suppression of Th2- and Treg -related cytokine production in vitro. These results suggest that CCR7 in DCs might play an essential role in host defence mechanisms against T. spiralis infection, particularly in the muscle stage of the infection, by accelerating Th2 and Treg cell responses.


Assuntos
Trichinella spiralis , Triquinelose , Animais , Citocinas/metabolismo , Células Dendríticas , Camundongos , Receptores CCR7/metabolismo
2.
BMB Rep ; 54(11): 563-568, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34488935

RESUMO

Cancer cells predominantly generate energy via glycolysis, even in the presence of oxygen, to support abnormal cell proliferation. Suppression of PDHA1 by PDK1 prevents the conversion of cytoplasmic pyruvate into Acetyl-CoA. Several PDK inhibitors have been identified, but their clinical applications have not been successful for unclear reasons. In this study, endogenous PDHA1 in A549 cells was silenced by the CRISPR/Cas9 system, and PDHA1WT and PDHA13SD were transduced. Since PDHA13SD cannot be phosphorylated by PDKs, it was used to evaluate the specific activity of PDK inhibitors. This study highlights that PDHA1WT and PDHA13SD A549 cells can be used as a cell-based PDK inhibitor-distinction system to examine the relationship between PDH activity and cell death by established PDK inhibitors. Leelamine, huzhangoside A and otobaphenol induced PDH activity-dependent apoptosis, whereas AZD7545, VER-246608 and DCA effectively enhanced PDHA1 activity but little toxic to cancer cells. Furthermore, the activity of phosphomimetic PDHA1 revealed the complexity of its regulation, which requires further in-depth investigation. [BMB Reports 2021; 54(11): 563-568].


Assuntos
Carcinoma Pulmonar de Células não Pequenas/patologia , Avaliação de Medicamentos/métodos , Inibidores Enzimáticos/farmacologia , Neoplasias Pulmonares/patologia , Piruvato Desidrogenase (Lipoamida)/antagonistas & inibidores , Células A549 , Apoptose , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/enzimologia , Inibidores Enzimáticos/química , Humanos , Neoplasias Pulmonares/tratamento farmacológico , Neoplasias Pulmonares/enzimologia , Fosforilação
3.
Exp Mol Med ; 53(5): 993-1004, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-34050263

RESUMO

Pathogenic conversion of Th17 cells into multifunctional helper T cells or Th1 cells contributes to the pathogenesis of autoimmune diseases; however, the mechanism regulating the plasticity of Th17 cells remains unclear. Here, we found that Th17 cells expressed latent TGF-ß1 in a manner dependent on autocrine TGF-ß1. By employing IL-17-producing cell-specific Tgfb1 conditional knockout and fate-mapping systems, we demonstrated that TGF-ß1-deficient Th17 cells are relatively susceptible to becoming IFN-γ producers through IL-12Rß2 and IL-27Rα upregulation. TGF-ß1-deficient Th17 cells exacerbated tissue inflammation compared to TGF-ß1-sufficient Th17 cells in adoptive transfer models of experimental autoimmune encephalomyelitis and colitis. Thus, TGF-ß1 production by Th17 cells provides an essential autocrine signal for maintaining the stability and regulating the pathogenicity of Th17 cells in vivo.


Assuntos
Autoimunidade , Imunomodulação , Células Th17/imunologia , Células Th17/metabolismo , Fator de Crescimento Transformador beta1/metabolismo , Animais , Comunicação Autócrina , Biomarcadores , Colite/etiologia , Colite/metabolismo , Colite/patologia , Suscetibilidade a Doenças , Encefalomielite Autoimune Experimental/etiologia , Encefalomielite Autoimune Experimental/metabolismo , Encefalomielite Autoimune Experimental/patologia , Regulação da Expressão Gênica , Imunofenotipagem , Contagem de Linfócitos , Camundongos , Camundongos Transgênicos , Modelos Biológicos , Receptores de Interleucina/genética , Receptores de Interleucina/metabolismo , Receptores de Interleucina-12/genética , Receptores de Interleucina-12/metabolismo , Subpopulações de Linfócitos T/imunologia , Subpopulações de Linfócitos T/metabolismo , Fator de Crescimento Transformador beta1/genética
4.
Pharmaceuticals (Basel) ; 15(1)2021 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-35056110

RESUMO

Infertility is an emerging health issue worldwide, and female infertility is intimately associated with embryo implantation failure. Embryo implantation is an essential process during the initiation of prenatal development. Recent studies have strongly suggested that autophagy in the endometrium is the most important factor for successful embryo implantation. In addition, several studies have reported the effects of various natural products on infertility improvement via the regulation of embryo implantation, embryo quality, and endometrial receptivity. However, it is unclear whether natural products can improve embryo implantation ability by regulating endometrial autophagy. Therefore, we performed a literature review of studies on endometrial autophagy, embryo implantation, natural products, and female infertility. Based on the information from these studies, this review suggests a new treatment strategy for female infertility by proposing natural products that have been proven to be safe and effective as endometrial autophagy regulators; additionally, we provide a comprehensive understanding of the relationship between the regulation of endometrial autophagy by natural products and female infertility, with an emphasis on embryo implantation.

5.
Sci China Life Sci ; 64(8): 1326-1335, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-33165810

RESUMO

Allergic asthma is a chronic inflammatory disease of the lung and the airway, which is characterized by aberrant type 2 immune responses to otherwise unharmful aeroallergens. While the central role of Th2 cells and type 2 cytokines in the pathogenesis of allergic asthma is well documented, the regulation and plasticity of Th2 cells remain incompletely understood. By using an animal model of allergic asthma in IL-4-reporter mice, we found that Th2 cells in the lung expressed higher levels of Rora than those in the lymph nodes, and that treatment with an RORα agonist SR1078 resulted in diminished Th2 cell responses in vivo. To determine the T cell-intrinsic role of RORα in allergic asthma in vivo, we established T cell-specific RORα-deficient (Cd4creRoraf/f) mice. Upon intranasal allergen challenges, Cd4creRoraf/f mice exhibited a significantly increased Th2 cells in the lungs and the airway and showed an enhanced eosinophilic inflammation compared to littermate control mice. Studies with Foxp3YFP-creRoraf/f mice and CD8+ T cell depletion showed that the increased Th2 cell responses in the Cd4creRoraf/f mice were independent of Treg cells and CD8+ T cells. Our findings demonstrate a critical regulatory role of RORα in Th2 cells, which suggest that RORα agonists could be effective for the treatment of allergic diseases.


Assuntos
Asma/tratamento farmacológico , Asma/imunologia , Benzamidas/farmacologia , Membro 1 do Grupo F da Subfamília 1 de Receptores Nucleares/metabolismo , Células Th2/efeitos dos fármacos , Células Th2/imunologia , Administração Intranasal , Animais , Aspergillus oryzae , Linfócitos T CD8-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/imunologia , Diferenciação Celular , Modelos Animais de Doenças , Interleucina-4/imunologia , Pulmão/efeitos dos fármacos , Pulmão/imunologia , Camundongos , Ovalbumina
6.
Expert Opin Drug Saf ; 19(10): 1349-1356, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32700588

RESUMO

BACKGROUND: The human leukocyte antigen (HLA)-B*13:01 was reported as an important risk factor for dapsone hypersensitivity syndrome (DHS) in Chinese and Thai populations. RESEARCH DESIGN AND METHODS: From the Korean nationwide registry, seven subjects with previous DHS were included. Their HLA allele/phenotype frequencies were compared with 8 dapsone-tolerant subjects recruited from a single institution, and general population (n = 485) in Korea. The authors also performed a meta-analysis with these data using previous Chinese and Thai studies. RESULTS: Among the seven DHS subjects, 85.7% presented with the HLA-B*13:01 allele. The HLA-C*03:04, HLA-DRB1*12:02 (both in linkage disequilibrium with HLA-B*13:01), and HLA-A*02:01 alleles were also presented in 85.7%, 71.4%, and 71.4%, respectively. Subjects with HLA-B*13:01 were susceptible to developing DHS compared to dapsone-tolerant controls (odds ratio [OR]: 73.667) and the Korean general population (OR: 139.500). HLA-C*03:04 (OR: 40.935), HLA-DRB*12:02 (OR: 36.613), and HLA-A*02:01 (OR: 5.862) showed similar results. In meta-analysis, HLA-B*13:01 was associated with dapsone-induced hypersensitivity (overall OR: 42.692), and subgroup analyses according to the control types demonstrated similar results (OR:43.694 and 41.866, respectively). CONCLUSIONS: Similar to previous Asian population studies, HLA-B*13:01 is significantly associated with the risk of DHS in Korea. These associations may be useful for preventing DHS and improving drug safety.


Assuntos
Dapsona/efeitos adversos , Síndrome de Hipersensibilidade a Medicamentos/etiologia , Antígeno HLA-B13/genética , Hansenostáticos/efeitos adversos , Adulto , Idoso , Povo Asiático/genética , Criança , Dapsona/administração & dosagem , Síndrome de Hipersensibilidade a Medicamentos/genética , Feminino , Genótipo , Humanos , Hansenostáticos/administração & dosagem , Masculino , Pessoa de Meia-Idade , Sistema de Registros , República da Coreia , Fatores de Risco
7.
Korean J Fam Med ; 41(2): 98-104, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32208401

RESUMO

BACKGROUND: Smartphone usage is indispensably beneficial to people's everyday lives. However, excessive smartphone usage has been associated with physical and mental health problems. This study aimed to evaluate the association of smartphone usage with depressive symptoms, suicidal thoughts, and suicide attempts in Korean adolescents. METHODS: This cross-sectional study was conducted in 54,603 Korean adolescent participants (26,930 male and 27,673 female) in the Korea Youth Risk Behavior Survey in 2017 who reported their smartphone use. We performed multiple logistic regression analysis to evaluate the association of smartphone use with mental health after adjusting for relevant covariates. RESULTS: Among the participants, 25.6% of male students and 38.4% of female students reported using their smartphone for at least 30 hours per week. As time duration of smartphone usage increased, the risk of experiencing depressive symptoms, suicidal thoughts, and suicide attempt tended to increase, with odds ratios (95% confidence interval) of 1.18 (1.10-1.26), 1.18 (1.08-1.29), and 1.34 (1.11-1.60), respectively, for high smartphone usage compared with low smartphone usage. These associations remained significant with only slight change in odds ratios after consideration of problems that may be caused by smartphone usage, such as conflicts with family members or peers, or disturbance in school work. CONCLUSION: Smartphone overuse was independently associated with an increased risk of mental health problems, which did not seem to be mediated by the problems caused by smartphone usage.

8.
Biomolecules ; 10(1)2020 01 10.
Artigo em Inglês | MEDLINE | ID: mdl-31936879

RESUMO

Among diverse helper T-cell subsets, Th17 cells appear to be pathogenic in diverse autoimmune diseases, and thus, targeting Th17 cells could be beneficial for the treatment of the diseases in humans. Ginsenoside Rg3 is one of the most potent components in Korean Red Ginseng (KRG; Panax ginseng Meyer) in ameliorating inflammatory responses. However, the role of Rg3 in Th17 cells and Th17-mediated autoimmunity is unclear. We found that Rg3 significantly inhibited the differentiation of Th17 cells from naïve precursors in a dendritic cell (DC)-T co-culture system. While Rg3 minimally affected the secretion of IL-6, TNFα, and IL-12p40 from DCs, it significantly hampered the expression of IL-17A and RORγt in T cells in a T-cell-intrinsic manner. Moreover, Rg3 alleviated the onset and severity of experimental autoimmune encephalomyelitis (EAE), induced by transferring myelin oligodendrocyte glycoprotein (MOG)-reactive T cells. Our findings demonstrate that Rg3 inhibited Th17 differentiation and Th17-mediated neuro-inflammation, suggesting Rg3 as a potential candidate for resolving Th17-related autoimmune diseases.


Assuntos
Anti-Inflamatórios/uso terapêutico , Encefalomielite Autoimune Experimental/tratamento farmacológico , Ginsenosídeos/uso terapêutico , Células Th17/efeitos dos fármacos , Animais , Anti-Inflamatórios/farmacologia , Células Cultivadas , Encefalomielite Autoimune Experimental/imunologia , Feminino , Ginsenosídeos/farmacologia , Inflamação/tratamento farmacológico , Inflamação/imunologia , Camundongos Endogâmicos C57BL , Células Th17/imunologia
9.
J Ginseng Res ; 43(1): 49-57, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30662293

RESUMO

BACKGROUND: Korean Red Ginseng (KRG; Panax ginseng Meyer) is a widely used medicinal herb known to exert various immune modulatory functions. KRG and one of its purified components, ginsenoside Rg3, are known to possess anti-inflammatory activities. How they impact helper T cell-mediated responses is not fully explored. In this study, we attempted to evaluate the effect of KRG extract (KRGE) and ginsenoside Rg3 on Th1 cell responses. METHODS: Using well-characterized T cell in vitro differentiation systems, we examined the effects of KRGE or enhanced Rg3 on the Th1-inducing cytokine production from dendritic cells (DC) and the naïve CD4+ T cells differentiation to Th1 cells. Furthermore, we examined the change of Th1 cell population in the intestine after treatment of enhanced Rg3. The influence of KRGE or enhanced Rg3 on Th1 cell differentiation was evaluated by fluorescence-activated cell sorting, enzyme-linked immunosorbent assay, and quantitative real-time polymerase chain reaction. RESULTS: KRGE significantly inhibited the production level of IL-12 from DCs and subsequent Th1 cell differentiation. Similarly, enhanced Rg3 significantly suppressed the expression of interferon gamma (IFNγ) and T-bet in T cells under Th1-skewing condition. Consistent with these effects in vitro, oral administration of enhanced Rg3 suppressed the frequency of Th1 cells in the Peyer's patch and lamina propria cells in vivo. CONCLUSION: Enhanced Rg3 negatively regulates the differentiation of Th1 cell in vitro and Th1 cell responses in the gut in vivo, providing fundamental basis for the use of this agent to treat Th1-related diseases.

10.
Nat Immunol ; 19(9): 1036, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29921921

RESUMO

In the version of this article initially published, the third label along the horizontal axis of Fig. 4b (Il13a) and the middle label above each plot in Fig. 6k (Stat-/-) were incorrect, and the hash marks along the horizontal axis for Fig. 6i were spaced incorrectly. Also, the statistical results in the citation for Supplementary Fig. 5a (*P < 0.05, **P < 0.01 and ***P < 0.001 (unpaired Student's t-test)) in the fifth subsection of Results were incorrect. The correct label for Fig. 4b is Il23a and for Fig. 6k is Stat1-/-, and the right hash mark along the horizontal axis for Fig. 6i should be beneath the data points at right. The correct citation of the statistical results is as follows: "(P < 0.05 and P < 0.01 (unpaired Student's t-test); Supplementary Fig. 5a)." The errors have been corrected in the HTML and PDF version of the article.

11.
Nat Immunol ; 19(6): 583-593, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29713015

RESUMO

The incidence of atherosclerosis is higher among patients with systemic lupus erythematosus (SLE); however, the mechanism by which an atherogenic environment affects autoimmunity remains unclear. We found that reconstitution of atherosclerosis-prone Apoe-/- and Ldlr-/- mice with bone marrow from lupus-prone BXD2 mice resulted in increased autoantibody production and glomerulonephritis. This enhanced disease was associated with an increase in CXCR3+ follicular helper T cells (TFH cells). TFH cells isolated from Apoe-/- mice had higher expression of genes associated with inflammatory responses and SLE and were more potent in inducing production of the immunoglobulin IgG2c. Mechanistically, the atherogenic environment induced the cytokine IL-27 from dendritic cells in a Toll-like receptor 4 (TLR4)-dependent manner, which in turn triggered the differentiation of CXCR3+ TFH cells while inhibiting the differentiation of follicular regulatory T cells. Blockade of IL-27 signals diminished the increased TFH cell responses in atherogenic mice. Thus, atherogenic dyslipidemia augments autoimmune TFH cell responses and subsequent IgG2c production in a TLR4- and IL-27-dependent manner.


Assuntos
Aterosclerose/imunologia , Dislipidemias/imunologia , Interleucinas/imunologia , Lúpus Eritematoso Sistêmico/imunologia , Linfócitos T Auxiliares-Indutores/imunologia , Animais , Autoimunidade/imunologia , Diferenciação Celular/imunologia , Células Dendríticas/imunologia , Camundongos , Camundongos Knockout , Receptor 4 Toll-Like/imunologia
12.
J Allergy Clin Immunol ; 142(2): 530-541.e6, 2018 08.
Artigo em Inglês | MEDLINE | ID: mdl-29038008

RESUMO

BACKGROUND: Inhaled protease allergens preferentially trigger TH2-mediated inflammation in allergic asthma. The role of dendritic cells (DCs) on induction of TH2 cell responses in allergic asthma has been well documented; however, the mechanism by which protease allergens induce TH2-favorable DCs in the airway remains unclear. OBJECTIVE: We sought to determine a subset of DCs responsible for TH2 cell responses in allergic asthma and the mechanism by which protease allergens induce the DC subset in the airway. METHODS: Mice were challenged intranasally with protease allergens or fibrinogen cleavage products (FCPs) to induce allergic airway inflammation. DCs isolated from mediastinal lymph nodes were analyzed for surface phenotype and T-cell stimulatory function. Anti-Thy1.2 and Mas-TRECK mice were used to deplete innate lymphoid cells and mast cells, respectively. Adoptive cell transfer, bone marrow DC culture, anti-IL-13, and Toll-like receptor (TLR) 4-deficient mice were used for further mechanistic studies. RESULTS: Protease allergens induced a remarkable accumulation of TH2-favorable programmed cell death 1 ligand 2 (PD-L2)+ DCs in mediastinal lymph nodes, which was significantly abolished in mice depleted of mast cells and, to a lesser extent, innate lymphoid cells. Mechanistically, FCPs generated by protease allergens triggered IL-13 production from wild-type mast cells but not from TLR4-deficient mast cells, which resulted in an increase in the number of PD-L2+ DCs. Intranasal administration of FCPs induced an increase in numbers of PD-L2+ DCs in the airway, which was significantly abolished in TLR4- and mast cell-deficient mice. Injection of IL-13 restored the PD-L2+ DC population in mice lacking mast cells. CONCLUSION: Our findings unveil the "protease-FCP-TLR4-mast cell-IL-13" axis as a molecular mechanism for generation of TH2-favorable PD-L2+ DCs in allergic asthma and suggest that targeting the PD-L2+ DC pathway might be effective in suppressing allergic T-cell responses in the airway.


Assuntos
Asma/imunologia , Células Dendríticas/imunologia , Fibrinogênio/metabolismo , Hipersensibilidade/imunologia , Fragmentos de Peptídeos/metabolismo , Peptídeo Hidrolases/metabolismo , Receptor 4 Toll-Like/metabolismo , Alérgenos/imunologia , Animais , Diferenciação Celular , Modelos Animais de Doenças , Fibrinogênio/imunologia , Humanos , Imunidade Inata , Interleucina-13/metabolismo , Ativação Linfocitária , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Fragmentos de Peptídeos/imunologia , Proteína 2 Ligante de Morte Celular Programada 1/metabolismo , Células Th2/imunologia , Receptor 4 Toll-Like/genética
13.
Virology ; 494: 215-24, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-27123586

RESUMO

A safe and effective vaccine against respiratory syncytial virus (RSV) should confer protection without causing vaccine-enhanced disease. Here, using a cotton rat model, we investigated the protective efficacy and safety of an RSV combination vaccine composed of F-encoding plasmid DNA and virus-like particles containing RSV fusion (F) and attachment (G) glycoproteins (FFG-VLP). Cotton rats with FFG-VLP vaccination controlled lung viral replication below the detection limit, and effectively induced neutralizing activity and antibody-secreting cell responses. In comparison with formalin inactivated RSV (FI-RSV) causing severe RSV disease after challenge, FFG-VLP vaccination did not cause weight loss, airway hyper-responsiveness, IL-4 cytokines, histopathology, and infiltrates of proinflammatory cells such as eosinophils. FFG-VLP was even more effective in preventing RSV-induced pulmonary inflammation than live RSV infections. This study provides evidence that FFG-VLP can be developed into a safe and effective RSV vaccine candidate.


Assuntos
Infecções por Vírus Respiratório Sincicial/imunologia , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Vacinas contra Vírus Sincicial Respiratório/imunologia , Vírus Sinciciais Respiratórios/genética , Vírus Sinciciais Respiratórios/imunologia , Vacinas de DNA/imunologia , Vacinas de Partículas Semelhantes a Vírus/imunologia , Animais , Anticorpos Neutralizantes/imunologia , Anticorpos Antivirais/imunologia , Citocinas/metabolismo , Modelos Animais de Doenças , Imunização , Imunoglobulina G/imunologia , Ratos , Infecções por Vírus Respiratório Sincicial/patologia , Infecções por Vírus Respiratório Sincicial/virologia , Vacinas contra Vírus Sincicial Respiratório/administração & dosagem , Vacinas contra Vírus Sincicial Respiratório/efeitos adversos , Vacinas contra Vírus Sincicial Respiratório/genética , Sigmodontinae , Vacinas de DNA/administração & dosagem , Vacinas de DNA/efeitos adversos , Vacinas de DNA/genética , Vacinas de Partículas Semelhantes a Vírus/administração & dosagem , Vacinas de Partículas Semelhantes a Vírus/efeitos adversos , Vacinas de Partículas Semelhantes a Vírus/genética , Proteínas do Envelope Viral/genética , Proteínas do Envelope Viral/imunologia , Proteínas Virais de Fusão/genética , Proteínas Virais de Fusão/imunologia
14.
Immune Netw ; 16(1): 1-12, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26937227

RESUMO

Th2 cell immunity is required for host defense against helminths, but it is detrimental in allergic diseases in humans. Unlike Th1 cell and Th17 cell subsets, the mechanism by which dendritic cells modulate Th2 cell responses has been obscure, in part because of the inability of dendritic cells to provide IL-4, which is indispensable for Th2 cell lineage commitment. In this regard, immune cells other than dendritic cells, such as basophils and innate lymphoid cells, have been suggested as Th2 cell inducers. More recently, multiple independent researchers have shown that specialized subsets of dendritic cells mediate Th2 cell responses. This review will discuss the current understanding related to the regulation of Th2 cell responses by dendritic cells and other immune cells.

15.
Int Immunopharmacol ; 28(2): 846-53, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25871878

RESUMO

Signal transducer and activator of transcription (STAT) family molecules play essential roles during the differentiation of helper T cells from naïve precursors. Although the role of STAT3 in driving Th17 cell polarization has been well established, its role on Th2 responses to allergens remains incompletely understood. By employing T cell-specific STAT3 deficient mice, we demonstrate that STAT3 in T cells plays diverse role on Th2 cells depending on their locations in an animal model of allergic asthma. In the bronchial lymph nodes, STAT3-deficient T cells produced significantly reduced levels of Th2 cytokines. The frequencies of Th2 cells among CD4(+) T cells in the lung were comparable between STAT3-sufficient and STAT3-deficient T cells. By contrast, STAT3-deficient T cells in the airway exhibited significantly enhanced production of Th2 cell cytokines compared to STAT3-sufficient T cells. Interestingly, a major population of IL-4/5 producers among STAT3-deficient T cells in the airway co-produced IFNγ. The frequency of Th17 cells was significantly diminished whereas that of Th1 cells was increased in all the lung-associated tissues. Our results demonstrate the dynamic and opposing roles of STAT3 during the development of Th2 cells from bronchial lymph nodes to the airway and propose the need of careful consideration on STAT3-targeting approaches for the treatment of lung diseases.


Assuntos
Asma/imunologia , Fator de Transcrição STAT3/imunologia , Células Th2/imunologia , Alérgenos/imunologia , Animais , Antígenos de Fungos/imunologia , Aspergillus/imunologia , Asma/patologia , Líquido da Lavagem Broncoalveolar/citologia , Contagem de Células , Diferenciação Celular/imunologia , Citocinas/imunologia , Modelos Animais de Doenças , Pulmão/citologia , Pulmão/imunologia , Linfonodos/imunologia , Camundongos Endogâmicos C57BL , Camundongos Knockout , Ovalbumina/imunologia , Peptídeo Hidrolases/imunologia , Células Th17/citologia , Células Th17/imunologia , Células Th2/citologia
16.
Virology ; 476: 217-225, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25553517

RESUMO

Respiratory syncytial virus (RSV) is one of the most important causes for viral lower respiratory tract disease in humans. There is no licensed RSV vaccine. Here, we generated recombinant influenza viruses (PR8/RSV.HA-G) carrying the chimeric constructs of hemagglutinin (HA) and central conserved-domains of the RSV G protein. PR8/RSV.HA-G virus showed lower pathogenicity without compromising immunogenicity in mice. Single intranasal inoculation of mice with PR8/RSV.HA-G induced IgG2a isotype dominant antibodies and RSV neutralizing activity. Mice with single intranasal inoculation of PR8/RSV.HA-G were protected against RSV infection as evidenced by significant reduction of lung viral loads to a detection limit upon RSV challenge. PR8/RSV.HA-G inoculation of mice did not induce pulmonary eosinophilia and inflammation upon RSV infection. These findings support a concept that recombinant influenza viruses carrying the RSV G conserved-domain can be developed as a promising RSV vaccine candidate without pulmonary disease.


Assuntos
Vírus da Influenza A/genética , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Vírus Sinciciais Respiratórios/imunologia , Proteínas do Envelope Viral/química , Proteínas do Envelope Viral/imunologia , Animais , Feminino , Glicoproteínas de Hemaglutininação de Vírus da Influenza/administração & dosagem , Glicoproteínas de Hemaglutininação de Vírus da Influenza/genética , Glicoproteínas de Hemaglutininação de Vírus da Influenza/imunologia , Humanos , Vírus da Influenza A/imunologia , Camundongos , Camundongos Endogâmicos BALB C , Estrutura Terciária de Proteína , Infecções por Vírus Respiratório Sincicial/imunologia , Infecções por Vírus Respiratório Sincicial/virologia , Vacinas contra Vírus Sincicial Respiratório/administração & dosagem , Vacinas contra Vírus Sincicial Respiratório/química , Vacinas contra Vírus Sincicial Respiratório/genética , Vacinas contra Vírus Sincicial Respiratório/imunologia , Vírus Sinciciais Respiratórios/química , Vírus Sinciciais Respiratórios/genética , Proteínas do Envelope Viral/administração & dosagem , Proteínas do Envelope Viral/genética
17.
Antiviral Res ; 110: 115-23, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25110201

RESUMO

This study demonstrates that immunization with non-replicating virus-like particle (FFG VLP) containing RSV F and G glycoproteins together with RSV F DNA induced T helper type 1 antibody responses to RSV F similar to live RSV infection. Upon RSV challenge 21weeks after immunization, FFG VLP vaccination induced protection against RSV infection as shown by clearance of lung viral loads, and the absence of eosinophil infiltrates, and did not cause lung pathology. In contrast, formalin-inactivated RSV (FI-RSV) vaccination showed significant pulmonary eosinophilia, severe mucus production, and extensive histopathology resulting in a hallmark of pulmonary pathology. Substantial lung pathology was also observed in mice with RSV re-infections. High levels of systemic and local inflammatory cytokine-secreting cells were induced in mice with FI-RSV but not with FFG VLP immunization after RSV challenge. Therefore, the results provide evidence that recombinant RSV FFG VLP vaccine can confer long-term protection against RSV without causing lung pathology.


Assuntos
Bronquiolite Viral/prevenção & controle , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Vírus Sinciciais Respiratórios/imunologia , Vacinas de DNA/imunologia , Vacinas de Partículas Semelhantes a Vírus/imunologia , Animais , Anticorpos Neutralizantes/sangue , Anticorpos Antivirais/sangue , Anticorpos Antivirais/imunologia , Bronquiolite Viral/imunologia , Bronquiolite Viral/virologia , Linhagem Celular , Eosinofilia/imunologia , Feminino , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , Inflamação/imunologia , Pulmão/imunologia , Pulmão/virologia , Camundongos , Camundongos Endogâmicos BALB C , Infecções por Vírus Respiratório Sincicial/imunologia , Vacinas contra Vírus Sincicial Respiratório , Células Sf9 , Spodoptera , Células Th1/imunologia , Vacinação , Proteínas Virais de Fusão/imunologia , Carga Viral/efeitos dos fármacos
18.
Vaccine ; 32(35): 4578-4585, 2014 Jul 31.
Artigo em Inglês | MEDLINE | ID: mdl-24951867

RESUMO

The ectodomain of matrix protein 2 (M2e) of influenza virus is suggested to be a rational target for a universal influenza A vaccine. However, there are some concerns that M2e vaccines might not be highly effective in the general population with diverse genetic backgrounds. Here we examined the immunogenicity and protective efficacy of the baculovirus-derived virus-like particles containing multiple M2e (M2eVLP) with AS04 adjuvant in a C57BL/6 mouse strain (H-2(b)). M2eVLP vaccine induced significant levels of M2e-specific IgG in C57BL/6 mice after vaccination. Furthermore, M2eVLP adjuvanted with AS04 was more effective than M2eVLP alone in conferring protection as well as in inducing recall humoral and T cell responses specific for M2e after lethal influenza virus challenge. A mechanistic study provides evidence that activation of dendritic cells by the toll-like receptor 4 agonist MPL in the AS04 adjuvant was associated with interferon-γ producing CD4 T cell responses. Our results suggest that AS04 adjuvanted M2eVLP vaccines have the potential to improve cross-protection.


Assuntos
Adjuvantes Imunológicos/administração & dosagem , Hidróxido de Alumínio/administração & dosagem , Vacinas contra Influenza/imunologia , Lipídeo A/análogos & derivados , Vacinas de Partículas Semelhantes a Vírus/imunologia , Proteínas da Matriz Viral/imunologia , Animais , Anticorpos Antivirais/sangue , Linfócitos T CD4-Positivos/imunologia , Modelos Animais de Doenças , Feminino , Vacinas contra Influenza/administração & dosagem , Vacinas contra Influenza/genética , Interferon gama/metabolismo , Lipídeo A/administração & dosagem , Camundongos Endogâmicos C57BL , Infecções por Orthomyxoviridae/imunologia , Infecções por Orthomyxoviridae/prevenção & controle , Vacinas de Partículas Semelhantes a Vírus/administração & dosagem , Vacinas de Partículas Semelhantes a Vírus/genética , Proteínas da Matriz Viral/genética
19.
Clin Exp Vaccine Res ; 3(1): 12-28, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24427759

RESUMO

Vaccination is one of the most effective and cost-benefit interventions that prevent the mortality and reduce morbidity from infectious pathogens. However, the licensed influenza vaccine induces strain-specific immunity and must be updated annually based on predicted strains that will circulate in the upcoming season. Influenza virus still causes significant health problems worldwide due to the low vaccine efficacy from unexpected outbreaks of next epidemic strains or the emergence of pandemic viruses. Current influenza vaccines are based on immunity to the hemagglutinin antigen that is highly variable among different influenza viruses circulating in humans and animals. Several scientific advances have been endeavored to develop universal vaccines that will induce broad protection. Universal vaccines have been focused on regions of viral proteins that are highly conserved across different virus subtypes. The strategies of universal vaccines include the matrix 2 protein, the hemagglutinin HA2 stalk domain, and T cell-based multivalent antigens. Supplemented and/or adjuvanted vaccination in combination with universal target antigenic vaccines would have much promise. This review summarizes encouraging scientific advances in the field with a focus on novel vaccine designs.

20.
Vet Parasitol ; 196(1-2): 106-13, 2013 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-23499484

RESUMO

Recently, attempts have been made to use parasites as novel candidates for live vaccine vectors against solid tumors. In this study, we examined the effects of Trichinella spiralis (T. spiralis) infection on solid tumor growth and metastasis. After oral infection with T. spiralis larvae, B16-F10 cells were injected subcutaneously and intravenously into C57BL/6 mice to evaluate tumor growth and metastatic potential, respectively. Tumor growth and lung metastases in T. spiralis infected mice were significantly reduced compared with control mice. To elucidate the mechanism of tumor reduction by parasitic infection, we conducted cytokine arrays using mouse serum. CXCL9 and CXCL10 were increased in the infection group and decreased in the infection-tumor group. However, the expression level was not changed in the infection-metastasis group compared to the infection or control-metastasis groups. Although SDF-1 and IL-4 were increased in the infection group, there was no significant change in expression in the infection-tumor group or the infection-metastasis group. Additionally, IL-4 and KC were increased in the infection-tumor group compared to the control-tumor group, but there was no difference in expression between the control-metastasis group and the infection-metastasis group. CXCL13 was significantly increased in the infection-metastasis group only. These results suggest that T. spiralis infection reduced tumor growth and metastasis through a complex transition in cytokine regulation profiles including CXCL9, CXCL10, and CXCL13.


Assuntos
Neoplasias Pulmonares/secundário , Melanoma/patologia , Neoplasias Experimentais/patologia , Trichinella spiralis/fisiologia , Triquinelose/patologia , Animais , Linhagem Celular Tumoral , Citocinas/genética , Citocinas/metabolismo , Camundongos , Análise Serial de Proteínas
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