Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 30
Filtrar
1.
Molecules ; 28(7)2023 Mar 24.
Artigo em Inglês | MEDLINE | ID: mdl-37049700

RESUMO

Geobarrettin D (1), a new bromoindole alkaloid, was isolated from the marine sponge Geodia barretti collected from Icelandic waters. Its structure was elucidated by 1D, and 2D NMR (including 1H-15N HSQC, 1H-15N HMBC spectra), as well as HRESIMS data. Geobarrettin D (1) is a new 6-bromoindole featuring an unusual purinium herbipoline moiety. Geobarrettin D (1) decreased secretion of the pro-inflammatory cytokine IL-12p40 by human monocyte derived dendritic cells, without affecting secretion of the anti-inflammatory cytokine IL-10. Thus, compound 1 shows anti-inflammatory activity.


Assuntos
Alcaloides , Geodia , Animais , Humanos , Geodia/química , Alcaloides/farmacologia , Citocinas , Anti-Inflamatórios , Estrutura Molecular
2.
J Immunol ; 205(10): 2840-2849, 2020 11 15.
Artigo em Inglês | MEDLINE | ID: mdl-33008950

RESUMO

Polyunsaturated fatty acids (PUFAs) and their metabolites are potent regulators of inflammation. Generally, omega (n)-3 PUFAs are considered proresolving whereas n-6 PUFAs are classified as proinflammatory. In this study, we characterized the inflammatory response in murine peritonitis and unexpectedly found the accumulation of adrenic acid (AdA), a poorly studied n-6 PUFA. Functional studies revealed that AdA potently inhibited the formation of the chemoattractant leukotriene B4 (LTB4), specifically in human neutrophils, and this correlated with a reduction of its precursor arachidonic acid (AA) in free form. AdA exposure in human monocyte-derived macrophages enhanced efferocytosis of apoptotic human neutrophils. In vivo, AdA treatment significantly alleviated arthritis in an LTB4-dependent murine arthritis model. Our findings are, to our knowledge, the first to indicate that the n-6 fatty acid AdA effectively blocks production of LTB4 by neutrophils and could play a role in resolution of inflammation in vivo.


Assuntos
Anti-Inflamatórios/metabolismo , Artrite Experimental/imunologia , Ácidos Graxos Ômega-6/metabolismo , Ácidos Graxos Insaturados/metabolismo , Peritonite/imunologia , Animais , Anti-Inflamatórios/análise , Ácido Araquidônico/metabolismo , Artrite Experimental/patologia , Células Cultivadas , Ácidos Graxos Ômega-6/análise , Ácidos Graxos Insaturados/análise , Humanos , Leucotrieno B4/metabolismo , Lipidômica , Macrófagos/imunologia , Macrófagos/metabolismo , Masculino , Camundongos , Camundongos Transgênicos , Neutrófilos/imunologia , Neutrófilos/metabolismo , Lavagem Peritoneal , Peritonite/patologia , Cultura Primária de Células , Células THP-1 , Zimosan/administração & dosagem , Zimosan/imunologia
3.
J Nat Prod ; 83(10): 2854-2866, 2020 10 23.
Artigo em Inglês | MEDLINE | ID: mdl-33016699

RESUMO

Chemical investigation of the marine bryozoan Flustra foliacea collected in Iceland resulted in isolation of 13 new bromotryptamine alkaloids, flustramines Q-W (1-7) and flustraminols C-H (8-13), and two new imidazole alkaloids, flustrimidazoles A and B (14 and 15), together with 12 previously described compounds (16-27). Their structures were established by detailed spectroscopic analysis using 1D and 2D NMR and HRESIMS. Structure 2 was verified by calculations of the 13C and 1H NMR chemical shifts using density functional theory. The relative and absolute configurations of the new compounds were elucidated on the basis of coupling constant analysis, NOESY, [α]D, and ECD spectroscopic data, in addition to chemical derivatization. The compounds were tested for in vitro anti-inflammatory activity using a dendritic cell model. Eight compounds (1, 3, 5, 13, 16, 18, 26, and 27) decreased dendritic cell secretion of the pro-inflammatory cytokine IL-12p40, and two compounds (4 and 14) increased secretion of the anti-inflammatory cytokine IL-10. Deformylflustrabromine B (27) showed the most potent anti-inflammatory effect (IC50 2.9 µM). These results demonstrate that F. foliacea from Iceland expresses a broad range of brominated alkaloids, many without structural precedents. The potent anti-inflammatory activity in vitro of metabolite 27 warrants further investigations into its potential as a lead for inflammation-related diseases.


Assuntos
Alcaloides/metabolismo , Anti-Inflamatórios/metabolismo , Briozoários/química , Imidazóis/metabolismo , Triptaminas/metabolismo , Alcaloides/química , Animais , Anti-Inflamatórios/química
4.
Mar Drugs ; 16(11)2018 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-30413031

RESUMO

An UPLC-qTOF-MS-based dereplication study led to the targeted isolation of seven bromoindole alkaloids from the sub-Arctic sponge Geodia barretti. This includes three new metabolites, namely geobarrettin A⁻C (1⁻3) and four known compounds, barettin (4), 8,9-dihydrobarettin (5), 6-bromoconicamin (6), and l-6-bromohypaphorine (7). The chemical structures of compounds 1⁻7 were elucidated by extensive analysis of the NMR and HRESIMS data. The absolute stereochemistry of geobarrettin A (1) was assigned by ECD analysis and Marfey's method employing the new reagent l-Nα-(1-fluoro-2,4-dinitrophenyl)tryptophanamide (l-FDTA). The isolated compounds were screened for anti-inflammatory activity using human dendritic cells (DCs). Both 2 and 3 reduced DC secretion of IL-12p40, but 3 concomitantly increased IL-10 production. Maturing DCs treated with 2 or 3 before co-culturing with allogeneic CD4⁺ T cells decreased T cell secretion of IFN-γ, indicating a reduction in Th1 differentiation. Although barettin (4) reduced DC secretion of IL-12p40 and IL-10 (IC50 values 11.8 and 21.0 µM for IL-10 and IL-12p40, respectively), maturing DCs in the presence of 4 did not affect the ability of T cells to secrete IFN-γ or IL-17, but reduced their secretion of IL-10. These results indicate that 2 and 3 may be useful for the treatment of inflammation, mainly of the Th1 type.


Assuntos
Alcaloides/farmacologia , Anti-Inflamatórios/farmacologia , Organismos Aquáticos , Geodia , Peptídeos Cíclicos/farmacologia , Alcaloides/química , Alcaloides/isolamento & purificação , Animais , Anti-Inflamatórios/química , Anti-Inflamatórios/isolamento & purificação , Linfócitos T CD4-Positivos/efeitos dos fármacos , Linfócitos T CD4-Positivos/metabolismo , Diferenciação Celular/efeitos dos fármacos , Células Cultivadas , Técnicas de Cocultura , Células Dendríticas , Humanos , Islândia , Indóis/química , Concentração Inibidora 50 , Interleucina-10/metabolismo , Subunidade p40 da Interleucina-12/metabolismo , Peptídeos Cíclicos/química , Peptídeos Cíclicos/isolamento & purificação , Estereoisomerismo
5.
Pharm Biol ; 55(1): 2116-2122, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28876152

RESUMO

CONTEXT: Halichondria (Halichondriidae) marine sponges contain components possessing various biological activities, but immunomodulation is not among the ones reported. OBJECTIVE: This study evaluated the immunomodulatory effects of fractions/compounds from Halichondria sitiens Schmidt. MATERIALS AND METHODS: Crude dichloromethane/methanol extracts of H. sitiens were subjected to various chromatographic techniques to obtain fractions/compounds with immunomodulatory activity, using bioassay-guided isolation. The effects of the fractions/compounds were determined by measuring secretion of cytokines and expression of surface molecules by dendritic cells (DCs) and their ability to stimulate and modify cytokine secretion by allogeneic CD4+ T cells. The bioactive fractions were chemically analyzed to identify the immunomodulatory constituents by 1D, 2D NMR, and HRMS data. RESULTS: Several lipophilic fractions from H. sitiens at 10 µg/mL decreased secretion of the pro-inflammatory cytokines IL-12p40 and IL-6 by the DCs, with maximum inhibition being 64% and 25%, respectively. In addition, fractions B3b3F and B3b3J decreased the ability of DCs to induce T cell secretion of IFN-γ. Fraction B3b3 induced morphological changes in DCs, characterized by extreme elongation of dendrites and cell clustering. Chemical screening revealed the presence of glycerides and some minor unknown constituents in the biologically active fractions. One new glyceride, 2,3-dihydroxypropyl 2-methylhexadecanoate (1), was isolated from one fraction and two known compounds, 3-[(1-methoxyhexadecyl)oxy]propane-1,2-diol (2) and monoheptadecanoin (3), were identified in another, but none of them had immunomodulatory activity. DISCUSSION AND CONCLUSIONS: These results demonstrate that several lipophilic fractions from H. sitiens have anti-inflammatory effects on DCs and decrease their ability to induce a Th1 type immune response.


Assuntos
Fatores Biológicos/farmacologia , Linfócitos T CD4-Positivos/metabolismo , Citocinas/metabolismo , Células Dendríticas/metabolismo , Poríferos , Células Th1/metabolismo , Animais , Fatores Biológicos/isolamento & purificação , Linfócitos T CD4-Positivos/efeitos dos fármacos , Técnicas de Cocultura , Citocinas/antagonistas & inibidores , Células Dendríticas/efeitos dos fármacos , Humanos , Lipídeos de Membrana/administração & dosagem , Lipídeos de Membrana/isolamento & purificação , Células Th1/efeitos dos fármacos , Transplante Homólogo/métodos
6.
Glycoconj J ; 33(3): 457-70, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-26924641

RESUMO

Murine zymosan-induced peritonitis is a widely used model for studying the molecular and cellular events responsible for the initiation, persistence and/or resolution of inflammation. Among these events, it is becoming increasingly evident that changes in glycosylation of proteins, especially in the plasma and at the site of inflammation, play an important role in the inflammatory response. Using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS)-based glycosylation profiling, we investigated the qualitative and quantitative effect of zymosan-induced peritonitis on N-glycosylation in mouse plasma and peritoneal fluid. Our results show that both N-glycomes exhibit highly similar glycosylation patterns, consisting mainly of diantennary and triantennary complex type N-glycans with high levels (>95 %) of galactosylation and sialylation (mostly NeuGc) and a medium degree of core fucosylation (30 %). Moreover, MS/MS structural analysis, assisted by linkage-specific derivatization of sialic acids, revealed the presence of O-acetylated sialic acids as well as disialylated antennae ("branching sialylation") characterized by the presence of α2-6-linked NeuGc on the GlcNAc of the NeuGcα2-3-Galß1-3-GlcNAc terminal motif. A significant decrease of (core) fucosylation together with an increase of both α2-3-linked NeuGc and "branching sialylation" were observed in N-glycomes of mice challenged with zymosan, but not in control mice injected with PBS. Importantly, substantial changes in glycosylation were already observed 12 h after induction of peritonitis, thereby demonstrating an unexpected velocity of the biological mechanisms involved.


Assuntos
Reação de Fase Aguda/metabolismo , Líquido Ascítico/metabolismo , Glicoproteínas/metabolismo , Peritonite/metabolismo , Processamento de Proteína Pós-Traducional , Acetilglucosamina/análogos & derivados , Acetilglucosamina/química , Acetilglucosamina/metabolismo , Reação de Fase Aguda/sangue , Animais , Líquido Ascítico/química , Feminino , Glicoproteínas/sangue , Glicoproteínas/química , Glicosilação , Camundongos , Camundongos Endogâmicos C57BL , Peritonite/sangue
7.
Anal Chem ; 87(10): 5036-40, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25915161

RESUMO

Differential mobility spectrometry (DMS) is capable of separating stereoisomeric molecular ions based on their mobility in an oscillating electrical field with an asymmetric waveform. Thus, it is an "orthogonal" technique to chromatography and (tandem) mass spectrometry. Bioactive lipids, particularly of the eicosanoid and docosanoid class feature numerous stereoisomers, which exhibit a highly specific structure-activity relationship. Moreover, the geometry of these compounds also reflects their biochemical origin. Therefore, the unambiguous characterization of related isomers of the eicosanoid and docosanoid classes is of fundamental importance to the understanding of their origin and function in many biological processes. Here we show, that SelexION DMS technology coupled to µLC-MS/MS is capable of differentiating at least five closely related leukotrienes partially coeluting and (almost) unresolvable using LC-MS/MS only. We applied the developed method to the separation of LTB4 and its coeluting isomer 5S,12S-diHETE in murine peritoneal exudate cells, showing that LTB4 is present only after zymosan A injection while its isomer 5S,12S-diHETE is produced after saline (PBS) administration. Additionally, we show that the SelexION technology can also be applied to the separation of PD1 and PDX (10S,17S-diHDHA), two isomeric protectins.


Assuntos
Antígenos CD59/isolamento & purificação , Leucotrienos/isolamento & purificação , Análise Espectral/métodos , Animais , Antígenos CD59/química , Cromatografia Líquida , Isomerismo , Leucotrienos/química , Camundongos , Espectrometria de Massas em Tandem
8.
J Nutr ; 142(4): 803-8, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22378326

RESUMO

Fish oil can have beneficial effects in health and disease. In healthy individuals, reduction of the inflammatory status may be of benefit, whereas in patients with systemic inflammation, such as sepsis, it is important to diminish the immunosuppression that is thought to contribute to poor outcome. The objective of this study was to determine the effects of dietary fish oil on monocytes/macrophages in blood, bone marrow, spleen, and peritoneum and chemokine concentrations in blood and peritoneum in healthy mice and mice with endotoxin-induced inflammation. Mice were fed a Western-type diet without fish oil (C) or with 2.8% fish oil (FO) for 6 wk and then either killed (healthy mice) or injected i.p. with endotoxin (LPS) and killed after 3, 8, 12, 24, or 48 h. Blood, bone marrow, spleen, and peritoneal lavage were collected. Expression of cell surface molecules and chemokine receptors was analyzed by flow cytometry and chemokine concentrations measured by ELISA. Healthy mice in the FO group had lower proportions of classical monocytes in blood than healthy mice in the C group. LPS administration increased the proportion of classical monocytes in blood in mice in the FO group but not in those in the C group. Healthy mice in the FO group had lower serum concentrations of CCL2 than mice in the C group, but in inflamed mice, CCL2 concentrations were higher in the FO group than in the C group. These results indicate that dietary fish oil can attenuate the inflammatory status in homeostasis but intensify the immune response upon inflammation.


Assuntos
Óleos de Peixe/efeitos adversos , Imunomodulação , Inflamação/sangue , Monócitos/imunologia , Animais , Medula Óssea/imunologia , Medula Óssea/metabolismo , Medula Óssea/patologia , Contagem de Células , Quimiocina CCL2/sangue , Quimiocina CCL2/metabolismo , Feminino , Inflamação/fisiopatologia , Lipopolissacarídeos , Macrófagos/imunologia , Macrófagos/metabolismo , Macrófagos Peritoneais/imunologia , Macrófagos Peritoneais/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Monócitos/metabolismo , Cavidade Peritoneal/citologia , Cavidade Peritoneal/patologia , Distribuição Aleatória , Índice de Gravidade de Doença , Baço/citologia , Baço/imunologia , Baço/metabolismo , Baço/patologia
9.
Inflamm Res ; 61(9): 931-9, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22585035

RESUMO

OBJECTIVE AND DESIGN: Recent studies indicate that neutrophils are heterogeneous and may have an immunosuppressive role in addition to their well-known phagocytic and bactericidal function. This study examined neutrophil subpopulations in the circulation, peritoneum, spleen and bone marrow from mice at various time points after induction of acute inflammation. MATERIAL, TREATMENT AND METHODS: Female C57BL/6 mice were injected intraperitoneally with lipopolysaccharide (LPS). Blood, peritoneal, spleen and bone marrow cells were collected and counted and expression of surface molecules and chemokine receptors analyzed with flow cytometry. Chemokine and cytokine concentrations in serum and peritoneal fluid were determined by ELISA. RESULTS: Neutrophil numbers in the circulation decreased following administration of LPS but reached similar numbers to those prior to inflammation at 8 h. At that time point, two distinct neutrophil populations were present in the circulation. These two neutrophil populations differed in size, granularity and expression of CD11b and Ly6G. Few neutrophils were recruited into the peritoneum until 24 h after administration of LPS at a time when the neutrophils in the circulation had increased their expression of the chemokine receptor CXCR2. CONCLUSIONS: Induction of acute inflammation leads to the appearance of two circulating neutrophil subpopulations, which may differ in their activation state and function.


Assuntos
Citocinas/imunologia , Inflamação/imunologia , Neutrófilos/imunologia , Animais , Líquido Ascítico/imunologia , Tamanho Celular , Citocinas/sangue , Feminino , Inflamação/induzido quimicamente , Contagem de Leucócitos , Lipopolissacarídeos , Camundongos , Camundongos Endogâmicos C57BL , Neutrófilos/citologia
10.
J Inflamm Res ; 15: 311-324, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35058705

RESUMO

PURPOSE: To determine the effects of dietary omega-3 polyunsaturated fatty acids (PUFAs) on recruitment of natural killer (NK) cells and resolution responses in antigen-induced peritonitis in mice. METHODS: Mice were fed fish oil-enriched or control diets, immunized twice and challenged intraperitoneally with methylated bovine serum albumin. Prior to and at different time-points following inflammation induction, expression of surface molecules on peritoneal cells was determined by flow cytometry, concentration of soluble mediators in peritoneal fluid by ELISA or Luminex, and of lipid mediators by LC-MS/MS, and number of apoptotic cells in mesenteric lymph nodes by TUNEL staining. RESULTS: Mice fed the fish oil diet had higher number of CD11b+CD27- NK cells as well as a higher proportion of CD107a+ NK cells in their peritoneum 6 h after inflammation induction than mice fed the control diet. They also had higher numbers of CCR5+ NK cells and higher concentrations of CCL5 and CXCL12. Additionally, a higher fraction of apoptotic neutrophils but lower fraction of CD47+ neutrophils were present in the peritoneum of mice fed the fish oil diet 6 h after inflammation induction and the fish oil fed mice had a shorter resolution interval. They also had lower concentrations of pro-inflammatory mediators but higher concentrations of the anti-inflammatory/pro-resolution mediators TGF-ß, IGF-1, and soluble TNF RII, as well as higher ratios of hydroxyeicosapentaenoic acid (HEPE) to hydroxyeicosatetraenoic acid (HETE) than mice fed the control diet. CONCLUSION: The results demonstrate that dietary fish oil increases the number of mature NK cells at the inflamed site in antigen-induced peritonitis and enhances several key hallmarks of resolution of inflammation, casting light on the potential mechanisms involved.

11.
Biomed Pharmacother ; 138: 111478, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33756155

RESUMO

BACKGROUND: Emu Oil (EO) previously demonstrated therapeutic potential in a mouse model of colitis-associated CRC (CA-CRC). Saireito, a traditional Japanese medicine, has not been investigated in CA-CRC. AIM: To determine whether EO and Saireito could be therapeutic in an azoxymethane (AOM)/dextran sulphate sodium (DSS) model of CA-CRC. METHODS: Female C57BL/6 mice were assigned to groups (n = 10/group); 1) saline control, 2) saline+Saireito, 3) saline+EO, 4) saline+EO/Saireito, 5) AOM/DSS control, 6) AOM/DSS+Saireito, 7) AOM/DSS+EO and 8) AOM/DSS+EO/Saireito. Mice were intraperitoneally injected with saline or AOM (7.4 mg/kg) on day 0 and underwent three DSS/water cycles (2%w/v DSS for 7 days, 14 days water). Mice were orally-gavaged with either water (80 µL), Saireito (80 µL), EO (80 µL) or EO/Saireito (160 µL; 80 µL EO + 80 µL Saireito) thrice weekly. Daily bodyweight and disease activity index (DAI) were recorded and colonoscopies performed on days 20, 41 and 62. Mice were euthanized on day 63. p < 0.05 was considered statistically significant. RESULTS: AOM/DSS induced significant bodyweight loss throughout the trial (max -36%), which was attenuated by Saireito (max +7%), EO (max +5%) and EO/Saireito (max +14%; p < 0.05). AOM/DSS increased DAI compared to saline controls (p < 0.05), which was reduced by Saireito, EO and EO/Saireito (p < 0.05). All treatments reduced colonoscopically-assessed colitis severity (days 20 and 41; p < 0.05). EO/Saireito further decreased colitis severity compared to Saireito and EO alone (day 20; p < 0.05). Finally, EO and EO/Saireito resulted in fewer colonic tumours compared to AOM/DSS controls (p < 0.05). CONCLUSION: Combined EO and Saireito reduced disease and tumour development in AOM/DSS mice, suggesting therapeutic potential in CA-CRC.


Assuntos
Anti-Inflamatórios/administração & dosagem , Neoplasias Associadas a Colite/tratamento farmacológico , Neoplasias Colorretais/tratamento farmacológico , Modelos Animais de Doenças , Medicamentos de Ervas Chinesas/administração & dosagem , Óleos/administração & dosagem , Animais , Neoplasias Associadas a Colite/induzido quimicamente , Neoplasias Associadas a Colite/patologia , Neoplasias Colorretais/induzido quimicamente , Neoplasias Colorretais/patologia , Sulfato de Dextrana/toxicidade , Quimioterapia Combinada , Feminino , Camundongos , Camundongos Endogâmicos C57BL
12.
Front Immunol ; 11: 570380, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33123143

RESUMO

Natural killer (NK) cells and neutrophils engage in crosstalk that is important in inflammation and likely also for resolution of inflammation. NK cells activate neutrophils and induce their infiltration to the inflamed sites but may also influence their apoptosis and their subsequent efferocytosis by macrophages. Several studies indicate that docosahexaenoic acid (DHA) can inhibit NK cell cytotoxicity but the effects of DHA on the ability of NK cells to engage in crosstalk with neutrophils and affect their functions have not been described. This study explored the kinetics of the effects of NK cells and NK cells pre-treated with DHA on neutrophil surface molecule expression and apoptosis, as well as the ability of NK cells to affect other neutrophil functions. In addition, the study explored the effects of neutrophils on NK cell phenotype and function. Primary NK cells were pre-incubated with or without DHA, then stimulated and co-cultured with freshly isolated neutrophils. When co-cultured with NK cells, neutrophils had higher expression levels of CD11b and CD47; secreted more IL-8, IL-1ra, and CXCL10; had increased phagocytic ability; and their apoptosis was increased early after initiation of the co-culture while dampened at a later time-point. Pre-incubation of NK cells with DHA attenuated NK cell-induced upregulation of CD11b and CD47 on neutrophils, had minor effects on NK cell induction of cytokine/chemokine secretion or their phagocytic ability. Neutrophils also affected the function of NK cells, lowering the frequency of NKp46+ and CXCR3+ NK cells and increasing the concentrations of IFN-γ, TNF-α, and GM-CSF in the co-cultures. Pre-incubation of NK cells with DHA further decreased the frequency of NKp46+ NK cells in the co-culture with neutrophils and decreased the concentrations of IFN-γ, CCL3 and GM-CSF. These findings indicate that NK cells have mostly pro-inflammatory effects on neutrophils and that DHA can attenuate some of these pro-inflammatory effects. Neutrophils had both anti- and pro-inflammatory effects on NK cells. When NK cells had been pre-treated with DHA, the anti-inflammatory effects were increased and some of the pro-inflammatory effects attenuated. Overall, the results suggest that DHA may lead to a more anti-inflammatory microenvironment for NK cell and neutrophil crosstalk.


Assuntos
Anti-Inflamatórios/farmacologia , Ácidos Docosa-Hexaenoicos/farmacologia , Inflamação/imunologia , Células Matadoras Naturais/imunologia , Neutrófilos/imunologia , Apoptose , Antígeno CD47/metabolismo , Comunicação Celular , Células Cultivadas , Técnicas de Cocultura , Citocinas/metabolismo , Humanos , Células Matadoras Naturais/efeitos dos fármacos , Receptor 1 Desencadeador da Citotoxicidade Natural/metabolismo , Fagocitose , Receptores CXCR3/metabolismo
13.
Oncogene ; 39(28): 5138-5151, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32533097

RESUMO

Waldenström's macroglobulinemia (WM) is a non-Hodgkin lymphoma, resulting in antibody-secreting lymphoplasmacytic cells in the bone marrow and pathologies resulting from high levels of monoclonal immunoglobulin M (IgM) in the blood. Despite the key role for BLIMP1 in plasma cell maturation and antibody secretion, its potential effect on WM cell biology has not yet been explored. Here we provide evidence of a crucial role for BLIMP1 in the survival of cells from WM cell line models and further demonstrate that BLIMP1 is necessary for the expression of the histone methyltransferase EZH2 in both WM and multiple myeloma cell lines. The effect of BLIMP1 on EZH2 levels is post-translational, at least partially through the regulation of proteasomal targeting of EZH2. Chromatin immunoprecipitation analysis and transcriptome profiling suggest that the two factors co-operate in regulating genes involved in cancer cell immune evasion. Co-cultures of natural killer cells and cells from a WM cell line further suggest that both factors participate in immune evasion by promoting escape from natural killer cell-mediated cytotoxicity. Together, the interplay of BLIMP1 and EZH2 plays a vital role in promoting the survival of WM cell lines, suggesting a role for the two factors in Waldenström's macroglobulinaemia.


Assuntos
Proteína Potenciadora do Homólogo 2 de Zeste/genética , Perfilação da Expressão Gênica/métodos , Regulação Neoplásica da Expressão Gênica , Linfoma não Hodgkin/genética , Fator 1 de Ligação ao Domínio I Regulador Positivo/genética , Linhagem Celular Tumoral , Sobrevivência Celular/genética , Proteína Potenciadora do Homólogo 2 de Zeste/metabolismo , Células HEK293 , Humanos , Linfoma não Hodgkin/metabolismo , Linfoma não Hodgkin/patologia , Mieloma Múltiplo/genética , Mieloma Múltiplo/metabolismo , Mieloma Múltiplo/patologia , Fator 1 de Ligação ao Domínio I Regulador Positivo/metabolismo , Ligação Proteica , Macroglobulinemia de Waldenstrom/genética , Macroglobulinemia de Waldenstrom/metabolismo , Macroglobulinemia de Waldenstrom/patologia
14.
Br J Nutr ; 101(7): 1040-6, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18680632

RESUMO

Dietary fish oil is considered to have anti-inflammatory effects based primarily on its effects on T-cell proliferation and IL-2 secretion. Its effects on the secretion of T helper (Th) 1-type cytokines vary and few studies have examined its effects on the secretion of Th2-type cytokines. In the present study, we examined the effects of dietary fish oil on the secretion of Th1 and Th2-type cytokines by splenocytes and the mechanism by which dietary fish oil affects Th2-type cytokine secretion. Mice were fed diets supplemented with 18 % fish oil (w/w) +2 % maize oil or 20 % maize oil for 6 weeks. Spleen cells, isolated splenic T cells and accessory cells (splenocytes depleted of T cells) were stimulated with anti-CD3/anti-CD28. The secretion of interferon (IFN)-gamma, TNF-alpha, IL-4 and IL-10 was measured by ELISA. Dietary fish oil decreased the secretion of IFN-gamma and TNF-alpha by total splenocytes and isolated T cells. In contrast, dietary fish oil increased the secretion of IL-4 by total splenocytes but had no effect on IL-4 secretion by isolated T cells. When isolated T cells were cultured with CD11b+ cells (mainly macrophages), cells from mice fed the fish oil diet secreted more IL-4 than cells from mice fed the maize oil diet. These results demonstrate that dietary fish oil directs cytokine secretion by splenocytes towards a Th2 phenotype and that the effects of dietary fish oil on the secretion of a Th2-type cytokine are mediated by its effect on CD11b+ accessory cells.


Assuntos
Anti-Inflamatórios/administração & dosagem , Citocinas/metabolismo , Óleos de Peixe/administração & dosagem , Células Th1/imunologia , Células Th2/imunologia , Animais , Antígeno B7-1/imunologia , Antígeno B7-2/imunologia , Antígenos CD28/imunologia , Complexo CD3/imunologia , Células Cultivadas , Citocinas/análise , Ácidos Graxos/administração & dosagem , Ácidos Graxos/análise , Feminino , Óleos de Peixe/química , Citometria de Fluxo , Interferon gama/análise , Interferon gama/metabolismo , Interleucina-10/análise , Interleucina-10/metabolismo , Interleucina-4/análise , Interleucina-4/metabolismo , Linfócitos/efeitos dos fármacos , Linfócitos/imunologia , Camundongos , Camundongos Endogâmicos BALB C , Óleos de Plantas/administração & dosagem , Distribuição Aleatória , Células Th1/efeitos dos fármacos , Células Th2/efeitos dos fármacos , Fator de Necrose Tumoral alfa/análise , Fator de Necrose Tumoral alfa/metabolismo , Zea mays
15.
Int Immunopharmacol ; 69: 328-336, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30772700

RESUMO

Regular bathing in the Blue Lagoon has beneficial effects on psoriasis. Previously, we showed that exopolysaccharides (EPS-Ca) secreted by Cyanobacterium aponinum, a dominating organism in the Blue Lagoon, increased IL-10 secretion by human dendritic cells (DCs). In addition, co-culturing allogeneic CD4+ T cells with DCs matured in the presence of EPS-Ca increased differentiation of T cells into T regulatory cells at the cost of the disease inducing Th17 cells. In the present study, EPS-Ca increased the proportion of DCs expressing CD141, a surface molecule linked to regulatory DCs, and the CD141+ cells secreted more IL-10 than the CD141- cells. EPS-Ca decreased T cell secretion of IL-17, IL-13 and IL-10 and the proportion of T cells expressing the activation marker CD69 that has also been linked to lymphocyte retention. In addition, EPS-Ca reduced keratinocyte secretion of CCL20 and CXCL10, chemokines implicated in recruitment of inflammatory cells. EPS-Ca decreased DC expression of Dectin-1/CLEC7A and SYK, keratinocyte expression of CLEC7A, SYK and CAMP (the gene for LL37), and T cell expression of phosphorylated Zap70. These results indicate that EPS-Ca may induce a regulatory phenotype of DCs, T cells that are less active/inflammatory and less prone to being retained in the skin, and keratinocytes that induce less recruitment of inflammatory cells to the skin and that these effects may be mediated by the effects of EPS-Ca on CLEC7A and SYK. Overall the results indicate that EPS-Ca may be involved in the beneficial effects psoriasis patients experience when bathing in the Blue Lagoon.


Assuntos
Cianobactérias/fisiologia , Células Dendríticas/fisiologia , Fontes Termais/microbiologia , Imunomodulação , Queratinócitos/fisiologia , Polissacarídeos Bacterianos/imunologia , Psoríase/terapia , Linfócitos T Reguladores/fisiologia , Células Th17/fisiologia , Diferenciação Celular , Células Cultivadas , Quimiocina CCL20/metabolismo , Quimiocina CXCL10/metabolismo , Regulação da Expressão Gênica , Estâncias para Tratamento de Saúde , Humanos , Islândia , Lectinas Tipo C/genética , Lectinas Tipo C/metabolismo , Ativação Linfocitária , Fenótipo , Quinase Syk/genética , Quinase Syk/metabolismo
16.
Mol Immunol ; 93: 1-8, 2018 01.
Artigo em Inglês | MEDLINE | ID: mdl-29112834

RESUMO

This study examined whether NK cells are important for resolution of antigen-induced inflammation. C57BL/6 mice were immunized twice with methylated BSA (mBSA) and inflammation induced by intraperitoneal injection of mBSA. Mice were injected intravenously with anti-asialo GM1 (αASGM1) or a control antibody 24h prior to peritonitis induction and peritoneal exudate collected at different time points. Expression of surface molecules and apoptosis on peritoneal cells was determined by flow cytometry and concentration of chemokines, cytokines, soluble cytokine receptors and lipid mediators by ELISA and LC-MS/MS. Apoptosis in parathymic lymph nodes and spleens was determined by TUNEL staining. Mice administered αASGM1 had lower peritoneal NK cell numbers and a higher number of peritoneal neutrophils 12h after induction of inflammation than control mice. The number of neutrophils was still high in the αASGM1 treated mice when their number had returned to baseline levels in the control mice, 48h after induction of inflammation. Peritoneal concentrations of the neutrophil regulators G-CSF and IL-12p40 were higher at 12h in the αASGM1 treated mice than in the control mice, whereas concentrations of lipid mediators implicated in resolution of inflammation, i.e. LXA4 and PGE2, were lower. Reduced apoptosis was detected in peritoneal neutrophils as well as in draining lymph nodes and spleens from the αASGM1 treated mice compared with that in the control mice. In addition, αASGM1 treated mice had lower number of peritoneal NK cells expressing NKp46 and NKG2D, receptors implicated in NK cell-induced neutrophil apoptosis. Furthermore, αASGM1 treatment completely blocked the increase in CD27+ NK cells that occurred in control mice following induction of inflammation, but CD27+ NK cells have been suggested to have a regulatory role. These results indicate a crucial role for NK cells in resolution of antigen-induced inflammation and suggest their importance in tempering neutrophil recruitment and maintaining neutrophil apoptosis.


Assuntos
Antígenos/toxicidade , Células Matadoras Naturais/imunologia , Peritonite/imunologia , Animais , Anticorpos/imunologia , Anticorpos/uso terapêutico , Apoptose/efeitos dos fármacos , Quimiocinas/análise , Dinoprostona/análise , Feminino , Gangliosídeo G(M1)/antagonistas & inibidores , Gangliosídeo G(M1)/imunologia , Fator Estimulador de Colônias de Granulócitos/análise , Imunofenotipagem , Mediadores da Inflamação/análise , Subunidade p40 da Interleucina-12/análise , Células Matadoras Naturais/efeitos dos fármacos , Lipoxinas/análise , Linfonodos/patologia , Camundongos , Camundongos Endogâmicos C57BL , Infiltração de Neutrófilos/efeitos dos fármacos , Peritonite/induzido quimicamente , Peritonite/metabolismo , Peritonite/terapia , Receptores de Células Matadoras Naturais/análise , Soroalbumina Bovina/toxicidade , Baço/patologia
17.
Lipids ; 42(8): 699-706, 2007 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-17605061

RESUMO

Omega-3 polyunsaturated fatty acids (PUFA) affect immune response, partly by affecting cytokine secretion. Omega-3 PUFA decrease tumor necrosis factor (TNF)-alpha secretion by RAW 264.7 macrophages but increase TNF-alpha secretion by primary elicited peritoneal macrophages in vitro. In this study, the effects of omega-3 and omega-6 PUFA on lipopolysaccharide induced TNF-alpha and interleukin (IL)-10 secretion by murine primary resident and elicited peritoneal macrophages and by RAW 264.7 macrophages, were examined in vitro using an enzyme-linked immunosorbent assay. In addition, the effects of dietary omega-3 PUFA on the number of cells secreting these cytokines were examined with enzyme-linked immunospot assay. All cell types secreted more TNF-alpha but similar amounts of IL-10 when incubated with the omega-3 PUFA, eicosapentaenoic acid or docosahexaenoic acid, compared with that when incubated with the omega-6 PUFA, linoleic acid or arachidonic acid. Dietary fish oil did not affect the number of TNF-alpha secreting resident peritoneal macrophages but decreased the number of macrophages secreting IL-10 ex vivo. These results show that dietary omega-3 PUFA and omega-3 PUFA added to cells in vitro increase TNF-alpha secretion by resident peritoneal macrophages, probably by a direct effect on the cells. In contrast, omega-3 PUFA did not affect IL-10 secretion by the cells but decreased the number of cells secreting IL-10 ex vivo, possibly by affecting cell recruitment, maturation or proliferation.


Assuntos
Ácidos Graxos Ômega-3/farmacologia , Interleucina-10/metabolismo , Macrófagos Peritoneais/imunologia , Fator de Necrose Tumoral alfa/metabolismo , Animais , Linhagem Celular , Feminino , Macrófagos Peritoneais/efeitos dos fármacos , Camundongos , Fatores de Tempo
18.
Carbohydr Polym ; 143: 131-8, 2016 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-27083352

RESUMO

Achillea millefolium has been used in traditional medicine for a number of ailments, including skin inflammation and wounds. A polysaccharide fraction (Am-25-d) isolated from aqueous extract from A. millefolium had an average molecular weight of 270 kDa and a monosaccharide composition of GalA, Gal, Ara, Xyl, Rha in molar ratio of 28:26:23:9:7. THP-1 cells primed with IFN-γ and stimulated with LPS in the presence of Am-25-d secreted more IL-1ß, IL-8, IL-10, IL-12p40, IL-23 and TNF-α than THP-1 cells stimulated in the absence of Am-25-d. However, when added to unstimulated cells Am-25-d did not increase secretion of the cytokines examined. Stimulating THP-1 monocytes in the presence of Am-25-d led to decreased nuclear concentrations of NF-κB and phosphorylation of ERK1/2 and Akt kinases compared with that when the cells were stimulated without Am-25-d. These findings indicate that Am-25-d isolated from A. millefolium has immunoenhancing properties that may be mediated via the Akt pathway.


Assuntos
Achillea/química , Citocinas/metabolismo , Fatores Imunológicos/farmacologia , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Proteína Quinase 3 Ativada por Mitógeno/metabolismo , NF-kappa B/metabolismo , Polissacarídeos/farmacologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Linhagem Celular Tumoral , Humanos , Fatores Imunológicos/química , Fatores Imunológicos/isolamento & purificação , Interleucina-10/metabolismo , Subunidade p40 da Interleucina-12/metabolismo , Polissacarídeos/química , Polissacarídeos/isolamento & purificação , Transdução de Sinais/efeitos dos fármacos , Fator de Necrose Tumoral alfa/metabolismo
19.
Phytomedicine ; 22(2): 277-82, 2015 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-25765833

RESUMO

Annotine is a lycopodane-type alkaloid isolated from the Icelandic club moss Lycopodium annotinum ssp. alpestre. Annotine does not inhibit acetylcholinesterase, as some other lycopodium alkaloids do, and other bioactivities have not been reported. The aim of this study was to determine the effects of annotine on maturation of dendritic cells (DCs) and their ability to activate allogeneic CD4(+) T cells. Human monocyte-derived DCs were matured in the absence or presence of annotine at a concentration of 1, 10 or 100 µg/ml. The effect of the annotine on maturation of the DCs was determined by measuring concentration of cytokines in culture supernatant by ELISA and expression of surface molecules by flow cytometry. DCs matured in the absence or presence of annotine at 100 µg/ml were also co-cultured with allogeneic CD4(+) T cells and concentration of cytokines in supernatants determined by ELISA and expression of surface molecules by flow cytometry. When cultured alone, DCs matured in the presence of annotine secreted less of the pro-inflammatory cytokines IL-6 and IL-23 and had a tendency toward less secretion of IL-12p40 than DCs matured in the absence of annotine. However, when DCs were matured in the presence of annotine and then co-cultured with allogeneic CD4(+) T cells they secreted more IL-12p40 and had a tendency toward secreting more IL-6 than DCs matured in the absence of annotine and then co-cultured with T cells. Allogeneic CD4(+) T cells co-cultured with DCs matured in the presence of annotine secreted more IL-13 than T cells co-cultured with DCs matured in the absence of annotine, but stimulating the DCs in the presence of annotine did not affect T cell secretion of IFN-γ and IL-17. There was also more IL-10 in co-cultures of T cells and DCs matured in the presence of annotine than in co-cultures of T cells and DCs matured in the absence of annotine. These results show that annotine increases the ability of DCs to direct the differentiation of allogeneic CD4(+) T cells toward a Th2/Treg phenotype, which may be of interest in the development of new treatments for Th1- and/or Th17-mediated inflammatory diseases.


Assuntos
Alcaloides/farmacologia , Diferenciação Celular , Células Dendríticas/efeitos dos fármacos , Lycopodium/química , Linfócitos T Reguladores/citologia , Células Th2/citologia , Células Cultivadas , Citocinas/metabolismo , Células Dendríticas/citologia , Humanos , Estrutura Molecular , Fenótipo
20.
J Immunol Methods ; 415: 36-45, 2014 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-25268546

RESUMO

Murine zymosan-induced peritonitis is the model most frequently used to study resolution of inflammation. However, the antigen-induced peritonitis model may be better suited for studying resolution of inflammation and the adaptive phase that follows. The objective of this study was to provide an evaluation of the kinetics of cells and mediators during induction, resolution and the adaptive immune phases of a murine antigen-induced inflammation. Female C57BL/6 mice were immunized twice subcutaneously with mBSA and three weeks after the initial immunization they were injected intraperitoneally (i.p.) with mBSA, which induced peritonitis. Peritoneal cells were counted and expression of surface molecules and chemokine receptors analyzed with flow cytometry. Chemokine and cytokine concentrations in peritoneal fluid were determined by ELISA. Two neutrophil populations, differing in size and granularity and slightly in expression of surface molecules, were observed in the peritoneal cavity after induction of inflammation. Macrophages disappeared from the peritoneal cavity following i.p. administration of mBSA but appeared again as they differentiated from recruited monocytes and peaked in numbers at 48 h. At that time point, two distinct populations of macrophages were present in the peritoneal cavity; one with high expression of F4/80, also expressing the atypical chemokine receptor D6 as well as CCR7; the other expressing low levels of F4/80 and also expressing CD11c and CD138. Eosinophils appeared in the peritoneum 3h following i.p. administration of mBSA and peaked at 48 h. At that time point they had upregulated their expression of CCR3 but decreased their expression of CD11b. Peritoneal levels of CCL11 peaked at 6h and may have led to recruitment of the eosinophils. NK cells and T cells peaked at 48 h, whereas B cells peaked at 5 days, with the majority being B1 cells. Peritoneal concentrations of pro-inflammatory cytokines (IL-ß and IL-6) and chemokines (CCL2 and CCL3) peaked at 3h, whereas IL-1ra peaked at 6h, sTNF-R at 24h and sIL-6R and TGF-ß at 48 h. The results show kinetic alterations in cell populations and mediators in a murine model that may be an excellent model to study initiation and resolution of inflammation and the following adaptive phase.


Assuntos
Citocinas/biossíntese , Macrófagos Peritoneais/imunologia , Neutrófilos/imunologia , Peritonite/imunologia , Animais , Antígenos de Diferenciação/genética , Antígenos de Diferenciação/imunologia , Linfócitos B/imunologia , Linfócitos B/patologia , Antígeno CD11c/genética , Antígeno CD11c/imunologia , Citocinas/metabolismo , Modelos Animais de Doenças , Eosinófilos/imunologia , Eosinófilos/patologia , Feminino , Expressão Gênica , Injeções Intraperitoneais , Células Matadoras Naturais/imunologia , Células Matadoras Naturais/patologia , Macrófagos Peritoneais/patologia , Camundongos , Camundongos Endogâmicos C57BL , Neutrófilos/patologia , Cavidade Peritoneal/patologia , Peritonite/induzido quimicamente , Peritonite/genética , Peritonite/patologia , Receptores CCR3/genética , Receptores CCR3/imunologia , Soroalbumina Bovina , Sindecana-1/genética , Sindecana-1/imunologia , Linfócitos T/imunologia , Linfócitos T/patologia
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa