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Triple-negative breast cancer (TNBC) is a highly heterogeneous tumor lacking estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2) expression. It has higher aggressiveness and metastasis than other subtypes, with limited effective therapeutic strategies, leading to a poor prognosis. The phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT)/mechanistic target of rapamycin (mTOR) signaling pathway is prevalently over-activated in human cancers and contributes to breast cancer (BC) growth, survival, proliferation, and angiogenesis, which could be an interesting therapeutic target. This review summarizes the PI3K/AKT/mTOR signaling pathway activation mechanism in TNBC and discusses the relationship between its activation and various TNBC subtypes. We also report the latest clinical studies on kinase inhibitors related to this pathway for treating TNBC. Our review discusses the issues that need to be addressed in the clinical application of these inhibitors.
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Proteínas Proto-Oncogênicas c-akt , Transdução de Sinais , Serina-Treonina Quinases TOR , Neoplasias de Mama Triplo Negativas , Humanos , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Neoplasias de Mama Triplo Negativas/metabolismo , Neoplasias de Mama Triplo Negativas/patologia , Serina-Treonina Quinases TOR/metabolismo , Serina-Treonina Quinases TOR/antagonistas & inibidores , Proteínas Proto-Oncogênicas c-akt/metabolismo , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Feminino , Fosfatidilinositol 3-Quinases/metabolismo , Terapia de Alvo Molecular/métodos , Inibidores de Proteínas Quinases/uso terapêutico , Inibidores de Proteínas Quinases/farmacologia , Inibidores de MTOR/uso terapêutico , Inibidores de MTOR/farmacologia , Antineoplásicos/uso terapêutico , Antineoplásicos/farmacologiaRESUMO
A 1,2:3,4:9,10:9,19-tetraseco-cycloartane triterpene spiroketal lactone, pseudoamaolide P (1), two new labdane-type diterpenoids, pseudoamains A and B (2-3), and four known cembrane-type diterpenoids (4-7) were isolated from the seeds of Pseudolarix amabilis. The structures of these compounds were elucidated by spectroscopic analyses, including HRESIMS, 1D-, and 2D-NMR. The anti-inflammatory activities of the compounds were evaluated by suppressing the transcription of the NF-κB-dependent reporter gene in LPS-induced 293 T/NF-κB-luc cells. All compounds do not show potent activity.
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Diterpenos , Furanos , Compostos de Espiro , Triterpenos , Lactonas/farmacologia , NF-kappa B , Triterpenos/farmacologia , Triterpenos/química , Diterpenos/farmacologia , Diterpenos/química , Sementes , Estrutura MolecularRESUMO
In 2021, breast cancer accounted for a substantial proportion of cancer cases and represented the second leading cause of cancer deaths among women worldwide. Although tumor cells originate from normal cells in the human body, they possess distinct biological characteristics resulting from changes in gene structure and function of cancer cells in contrast with normal cells. These distinguishing features, known as hallmarks of cancer cells, differ from those of normal cells. The hallmarks primarily include high metabolic activity, mitochondrial dysfunction, and resistance to cell death. Current evidence suggests that the fundamental hallmarks of tumor cells affect the tissue structure, function, and metabolism of tumor cells and their internal and external environment. Therefore, these fundamental hallmarks of tumor cells enable tumor cells to proliferate, invade and avoid apoptosis. Modifying these hallmarks of tumor cells represents a new and potentially promising approach to tumor treatment. The key to breast cancer treatment lies in identifying the optimal therapeutic agent with minimal toxicity to normal cells, considering the specific types of tumor cells in patients. Some herbal medicines contain active ingredients which can precisely achieve this purpose. In this review, we introduce Ginsenoside's mechanism and research significance in achieving the therapeutic effect of breast cancer by changing the functional hallmarks of tumor cells, providing a new perspective for the potential application of Ginsenoside as a therapeutic drug for breast cancer.
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There has been an important change in the clinical characteristics and immune profile of Coronavirus disease 2019 (COVID-19) patients during the pandemic thanks to the extensive vaccination programs. Here, we highlight recent studies on COVID-19, from the clinical and immunological characteristics to the protective and risk factors for severity and mortality of COVID-19. The efficacy of the COVID-19 vaccines and potential allergic reactions after administration are also discussed. The occurrence of new variants of concerns such as Omicron BA.2, BA.4, and BA.5 and the global administration of COVID-19 vaccines have changed the clinical scenario of COVID-19. Multisystem inflammatory syndrome in children (MIS-C) may cause severe and heterogeneous disease but with a lower mortality rate. Perturbations in immunity of T cells, B cells, and mast cells, as well as autoantibodies and metabolic reprogramming may contribute to the long-term symptoms of COVID-19. There is conflicting evidence about whether atopic diseases, such as allergic asthma and rhinitis, are associated with a lower susceptibility and better outcomes of COVID-19. At the beginning of pandemic, the European Academy of Allergy and Clinical Immunology (EAACI) developed guidelines that provided timely information for the management of allergic diseases and preventive measures to reduce transmission in the allergic clinics. The global distribution of COVID-19 vaccines and emerging severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants with reduced pathogenic potential dramatically decreased the morbidity, severity, and mortality of COVID-19. Nevertheless, breakthrough infection remains a challenge for disease control. Hypersensitivity reactions (HSR) to COVID-19 vaccines are low compared to other vaccines, and these were addressed in EAACI statements that provided indications for the management of allergic reactions, including anaphylaxis to COVID-19 vaccines. We have gained a depth knowledge and experience in the over 2 years since the start of the pandemic, and yet a full eradication of SARS-CoV-2 is not on the horizon. Novel strategies are warranted to prevent severe disease in high-risk groups, the development of MIS-C and long COVID-19.
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Anafilaxia , Vacinas contra COVID-19 , COVID-19 , Criança , Humanos , Vacinas contra COVID-19/efeitos adversos , Síndrome de COVID-19 Pós-Aguda , SARS-CoV-2RESUMO
The infection of coronavirus disease (COVID-19) seriously threatens human life. It is urgent to generate effective and safe specific antibodies (Abs) against the pathogenic elements of COVID-19. Mice were immunized with SARS-CoV-2 spike protein antigens: S ectodomain-1 (CoV, in short) mixed in Alum adjuvant for 2 times and boosted with CoV weekly for 6 times. A portion of mice were treated with Maotai liquor (MTL, in short) or/and heat stress (HS) together with CoV boosting. We observed that the anti-CoV Ab was successfully induced in mice that received the CoV/Alum immunization for 2 times. However, upon boosting with CoV, the CoV Ab production diminished progressively; spleen CoV Ab-producing plasma cell counts reduced, in which substantial CoV-specific Ab-producing plasma cells (sPC) were apoptotic. Apparent oxidative stress signs were observed in sPCs; the results were reproduced by exposing sPCs to CoV in the culture. The presence of MTL or/and HS prevented the CoV-induced oxidative stress in sPCs and promoted and stabilized the CoV Ab production in mice in re-exposure to CoV. In summary, CoV/Alum immunization can successfully induce CoV Ab production in mice that declines upon reexposure to CoV. Concurrent administration of MTL/HS stabilizes and promotes the CoV Ab production in mice.
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Anticorpos Neutralizantes/biossíntese , Anticorpos Antivirais/biossíntese , Apoptose , COVID-19/imunologia , Plasmócitos/imunologia , SARS-CoV-2/fisiologia , Superóxido Dismutase-1/fisiologia , Adjuvantes Imunológicos , Bebidas Alcoólicas , Compostos de Alúmen , Enzima de Conversão de Angiotensina 2/fisiologia , Animais , Anticorpos Neutralizantes/sangue , Anticorpos Antivirais/sangue , COVID-19/enzimologia , Vacinas contra COVID-19/imunologia , Resposta ao Choque Térmico , Imunização Secundária , Imunogenicidade da Vacina , Janus Quinase 2/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Estresse Oxidativo , Plasmócitos/efeitos dos fármacos , Plasmócitos/patologia , Espécies Reativas de Oxigênio/metabolismo , Fator de Transcrição STAT1/fisiologia , Transdução de Sinais , Organismos Livres de Patógenos Específicos , Glicoproteína da Espícula de Coronavírus/imunologia , VacinaçãoRESUMO
Background: Many studies have demonstrated the efficacy of single-allergen sublingual immunotherapy (SLIT) in polysensitized patients with allergic rhinitis (AR), but less is reported in polysensitized patients with allergic asthma (AS). Method: Data of 133 adult patients with house dust mite (HDM)-induced AS who had been treated for 3 years were collected. These patients were divided into the control group (treated with low to moderate dose of inhaled glucocorticoids and long-acting ß2 agonists, n = 37) and the SLIT group (further treated with Dermatophagoides farinae drops, n = 96). The SLIT group contained three subgroups: the single-allergen group (only sensitized to HDM, n = 35), the 1- to 2-allergen group (HDM combined with one to two other allergens, n = 32), and the 3-or-more-allergen group (HDM combined with three or more other allergens, n = 29). The total asthma symptom score (TASS), total asthma medicine score (TAMS), and asthma control test (ACT) were assessed before treatment and at yearly visits. Forced expiratory volume in 1 s/forced vital capacity (FEV1/FVC) was assessed before treatment and at the end of SLIT. Results: TASS and ACT scores in the control group were significantly higher than that in the single-allergen group and the 1- to 2-allergen group after 1, 2, and 3 years of SLIT and significantly higher than that in the 3-or-more-allergen group after 3-year SLIT (all p < 0.05). TAMS of the control group was significantly higher than that of the other three groups after 0.5, 1, 2, and 3 years of SLIT (all p < 0.05). FEV1/FVC in the control group was significantly higher than baseline after 3 years of immunotherapy (p < 0.05). Conclusion: Patients sensitized to HDM with/without other allergens showed similar efficacy after 3 years of SLIT. However, the initial response of patients with three or more allergens was slower during immunotherapy process.
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BACKGROUND: Skewed T helper (Th)2 response plays a crucial role in the pathogenesis of allergic diseases. The therapeutic efficacy for allergic diseases is unsatisfactory currently. This study aims to regulate the skewed Th2 response with CARsomes. METHODS: The CARsome consisted of an epitope of Dermatophagoides farina-1 (Derf1), a segment of the anti-DEC205 antibody, the scFv, and an open reading frame of perforin. This fusion protein binds to DEC205 molecule on the surface of exosomes derived from dendritic cells (DC). The effects of CARsome on inducing antigen (Ag)-specific Th2 cell apoptosis were assessed both in vivo and in vitro. RESULTS: Exposure to CARsomes in the culture induced Ag-specific Th2 cell apoptosis. Injection of CARsomes through the vein puncture also induced Ag-specific Th2 cell apoptosis in the lungs of sensitized mice. CARsomes could induce Ag-specific regulatory T cells. Administration of CARsomes efficiently inhibited experimental allergic airway inflammation. CONCLUSIONS: The CARsomes can inhibit allergic airway inflammation by inducing Ag-specific Th2 cell apoptosis and induce Ag-specific regulatory T cells. The data suggest that CARsomes have the translational potential to be used to treat allergic airway inflammation.
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Asma , Células Th2 , Animais , Antígenos , Apoptose , Células Dendríticas , Inflamação , Camundongos , Camundongos Endogâmicos BALB C , OvalbuminaRESUMO
The phytochemical study of the ethanol extract of the leaves and twigs of Rhododendron decorum afforded a new ascorbic acid derivative (1), a new ionone analogue (2), a new ursane-type triterpenoid glucoside (3), and four known compounds (4-7). The structures were elucidated by spectroscopic analyses, including HRESIMS, 1D, and 2D NMR. The anti-neuroinflammatory activities of the compounds were evaluated by measuring inhibitory effects of LPS-induced NO production in BV2 cells.
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Ácido Ascórbico/análogos & derivados , Ácido Ascórbico/química , Rhododendron/química , Terpenos/química , Terpenos/farmacologia , Anti-Inflamatórios não Esteroides/farmacologia , Ácido Ascórbico/farmacologia , Linhagem Celular , Humanos , Lipopolissacarídeos/farmacologia , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Óxido Nítrico/antagonistas & inibidores , Folhas de Planta/química , Caules de Planta/química , Espectrometria de Massas por Ionização por ElectrosprayRESUMO
Three new leucothane-type (1-3), two new micrathane-type (4, 5), eight new grayanane-type diterpenoids (6-13), and four known compounds were obtained from the ethanol extract of the leaves and twigs of Rhododendron decorum. The structures were determined based on NMR spectra, quantum chemical calculations, and X-ray crystallography. The antinociceptive activities of compounds 1, 3, 4, 6, 8, 10-13, and 15-17 were evaluated via the acetic acid-induced writhing test. Compounds 1, 8, 11-13, and 15 exhibited significant antinociceptive activities. In particular, 12 and 15 were found to be effective at doses of 0.8 and 0.08 mg/kg, respectively.
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Analgésicos/química , Diterpenos/química , Folhas de Planta/química , Rhododendron/química , Analgésicos/farmacologia , Cristalografia por Raios X/métodos , Diterpenos/farmacologia , Medicamentos de Ervas Chinesas/química , Medicamentos de Ervas Chinesas/farmacologia , Ressonância Magnética Nuclear Biomolecular/métodos , Extratos Vegetais/química , Extratos Vegetais/farmacologiaRESUMO
The therapeutic efficacy of allergen specific immunotherapy (SIT) on allergic diseases is to be improved. Probiotics can regulate immune response. This study aims to promote the effect of SIT on allergic rhinitis (AR) by co-administration with Clostridium butyricum (Cb). In this study, patients with AR sensitized to mite allergens were enrolled to this study, and treated with SIT or/and Cb. The therapeutic efficacy was evaluated by the total nasal symptom scores (NSS), medication scores, serum specific IgE levels and T helper (Th)2 cytokine levels. The improvement of immune regulation in the AR patients was assessed by immunologic approaches. The results showed that treating AR patients with SIT alone markedly reduced NSS and medication scores; but did not alter the serum specific IgE, Th2 cytokines and skin prick test (SPT) index. The clinical symptoms on AR in SIT group relapsed one month after stopping SIT. Co-administration of Cb significantly enhanced the efficacy of SIT on AR as shown by suppression of NSS, medication scores, serum specific IgE, Th2 cytokines and SPT index; the regulatory B cell frequency was also markedly increased. Such an effect on AR was maintained throughout the observation period even after stopping the treatment. Butyrate blocked the activation of histone deacetylase-1, the downstream activities of epsilon chain promoter activation, and the IgE production in the antigen specific B cells. On the other hand, butyrate induced the IL-10 expression in B cells with a premise of the B cell receptor activation by specific antigens. In conclusion, administration with Cb can markedly enhance the efficacy of SIT on AR.
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Linfócitos B Reguladores/imunologia , Dessensibilização Imunológica , Probióticos/uso terapêutico , Rinite Alérgica/terapia , Adulto , Butiratos/farmacologia , Diferenciação Celular/efeitos dos fármacos , Clostridium butyricum , Feminino , Humanos , Imunoglobulina E/sangue , Interleucina-10/genética , Masculino , Rinite Alérgica/imunologiaRESUMO
The initiation mechanism of IgE expression has not been fully understood. Flagellin (FGN) is an important microbial factor in the regulation of immune responses in the intestine. This study tests a hypothesis that FGN plays a crucial role in the isotype switching of IgE in B cells and the initiation of food allergy. In this study, the expression of IgE in B cells was analyzed by real time RT-PCR, Western blotting and chromatin immunoprecipitation. A mouse model was developed to assess the role of Toll like receptor-5 in the development of IgE-mediated allergic reaction in the intestinal mucosa. The results showed that exposure to FGN suppressed the expression of Bcl6 in B cells via increasing the levels of histone deacetylase (HDAC) 7; the latter up regulated the levels of methylated H3K9 and H3K27, down regulated RNA polymerase II and STAT3 (signal transducer and activator of transcription 3) at the Bcl6 promoter locus. Exposure to FGN and IL-4 markedly increased the expression of IgE in B cells via activating p300, H3K4, Pol II and STAT6 at the IgE promoter locus. As compared with the sensitized wild mice, the sensitized TLR5-deficient mice showed no detectable OVA-specific IgE in the serum; mast cells in the intestinal mucosa were not activated, no apparent allergic symptoms were evoked after the specific antigen challenge. In conclusion, FGN facilitates the initiation of food allergy in mice by triggering IgE transcription in B cells in a Th2 polarization environment via activating HDAC7 and suppressing Bcl6 expression.
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TIM4 (T cell immunoglobulin mucin domain molecule-4) plays a critical role in the initiation of skewed T helper (Th) 2 polarization. The factors regulating TIM4 expression are unclear. This study tests a hypothesis that p300 and STAT6 (signal transducer and activator transcription-6) regulates TIM4 expression in dendritic cells (DC). In this study, a food allergy mouse model was developed with ovalbumin (a specific antigen) and cholera toxin (CT; an adjuvant). The chromatin immunoprecipitation assay was performed to evaluate the chromatin changes at TIM4 and STAT6 promoters. The TIM4 expression was evaluated by real time RT-PCR and Western blotting. The results showed that high levels of p300 and TIM4 were detected in the intestinal DCs of mice with intestinal allergy. p300 is involved in the CT-induced TIM4 expression in DCs. p300 interacts with the chromatin at the TIM4 promoter locus in DCs isolated from allergic mice. CT increases p300 expression to regulate STAT6 levels in DCs. STAT6 mediates the CT-induced TIM4 expression in DCs. In conclusion, p300 and STAT6 mediate the microbial product CT-induced TIM4 expression in DCs.
Assuntos
Hipersensibilidade Alimentar/genética , Proteínas de Membrana/biossíntese , Fator de Transcrição STAT6/genética , Fatores de Transcrição de p300-CBP/biossíntese , Animais , Polaridade Celular/imunologia , Toxina da Cólera/efeitos adversos , Toxina da Cólera/imunologia , Toxina da Cólera/farmacologia , Células Dendríticas/efeitos dos fármacos , Células Dendríticas/imunologia , Modelos Animais de Doenças , Hipersensibilidade Alimentar/imunologia , Regulação da Expressão Gênica , Humanos , Mucosa Intestinal/metabolismo , Intestinos/efeitos dos fármacos , Intestinos/imunologia , Proteínas de Membrana/genética , Camundongos , Ovalbumina/efeitos adversos , Ovalbumina/imunologia , Ovalbumina/farmacologia , Regiões Promotoras Genéticas , Fator de Transcrição STAT6/metabolismo , Células Th2/efeitos dos fármacos , Células Th2/imunologia , Fatores de Transcrição de p300-CBP/genéticaRESUMO
Immune regulatory system dysfunction plays a role in the pathogenesis of asthma. The therapeutic effect of allergic asthma is to be improved. The immune regulatory function of probiotics has been recognized. This study tests a hypothesis that Clostridium butyricum (CB) enhances the effect of allergen specific immunotherapy (AIT) on asthma. In this study patients with allergic asthma were treated with AIT or/and CB for six months. The therapeutic effect and IgE production of the patients were observed. The results showed that administration with AIT alone alleviated the asthma symptoms; but the serum levels of interleukin (IL)-4, IL-5, IL-13 and specific IgE were not altered, which was markedly improved by the administration with CB plus AIT. Such effects were maintained only for two months in the patients treated with AIT alone; but maintained more than 12 months in those patients treated with both AIT and CB. CB facilitated AIT to induce IL-10+ B cells (B10 cells) in asthma patients. AIT/CB therapy converted antigen specific B cells to antigen specific regulatory B cells. Butyrate modulated the gene transcription of IgE and IL-10 in the allergen specific B cells. In conclusion, administration of CB can enhance the therapeutic effect of AIT in the treatment of allergic asthma via facilitating generation of B10 cells.
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In the study, N-t-butyl-2-benzothiazole sulfenimide (TBSI) was prepared by NS-acetic anhydride method with acetic anhydride as solvent. It was detected with FTIR, XRD, UV-Vis, TG-DTA. Micro-structure and essence disciplinarian of them were disclosed. Chemical bond types into TBSI molecule were revealed with FTIR. TBSI phase composition and structure were revealed with crystallographic data from XRD detecting such as cell parameters and crystal face index. The phase composition and qualitative identification of TBSI structure were completed. The absorption peaks were detected by UV-vis at 228.3, 281.3 and 298.3 nm, respectively caused by nâσ*, πâπ*, nâπ* electron transition. It could provide basic data with the enterprise of ZBPD product quality inspection. Two kinds of information were detected with TG-DTA as quality change and thermal effect. There were three absorption peaks of 46.5, 188.9, 368. 5 â due to a few residual solvent volatilization in the sample, phase transition peak and decomposition peak. The decomposition temperature of TBSI was very high. It could provided reference with research on rubber vulcanizing properties with TBSI on rubber vulcanizing machine. This study could provide basis experimental data on the enterprises to designate the working standard tracing detection of TBSI industrialized production. Performance index of TBSI was judged. The project of TBSI industry standard could be declared by the enterprises, written a draft standard.
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The T helper 1 (Th1) polarization plays a critical role in the pathogenesis of a number of inflammatory disorders in the body; the remedies in the correction of polarized Th1 cells are limited. This study aims to investigate the role of T cell immunoglobulin mucin domain molecule 4 (TIM4) in the induction of Th1 cell apoptosis. In this study, polarized Th1 cells were generated from naive Th1 cells from the mouse spleen. Recombinant TIM4 was added to the culture to stimulate the polarized Th1 cells. The apoptosis of Th1 cells was assessed by flow cytometry. The expression of FasL was analyzed by chromatin immunoprecipitation, real time RT-PCR, and Western blotting. The results showed that the polarized Th1 cells expressed high levels of TIM3. After exposure of the polarized Th1 cells to TIM4 in the culture, a complex of TIM3 and TIM4 was detected on the surface of Th1 cells, which induced the Th1 cell apoptosis. The engagement of TIM3 by TIM4 increased p300 phosphorylation in Th1 cells, which further increased the levels of Fas ligand in the cells and induced Th1 cell apoptosis. In conclusion, TIM4 binds TIM3 on the surface of polarized Th1 cells to induce Th1 cell apoptosis, which may contribute to the development of Th2-dominant immune disorders.
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Apoptose , Receptor Celular 2 do Vírus da Hepatite A/metabolismo , Proteínas de Membrana/metabolismo , Células Th1/metabolismo , Animais , Diferenciação Celular , Proteína p300 Associada a E1A/metabolismo , Proteína Ligante Fas/metabolismo , Receptor Celular 2 do Vírus da Hepatite A/genética , Masculino , Proteínas de Membrana/genética , Camundongos , Fosforilação , Ligação Proteica , Células Th1/citologia , Células Th1/imunologia , Células Th2/imunologia , Células Th2/metabolismoRESUMO
The disruption of epithelial barrier integrity is an important factor in the pathogenesis of various immune disorders. However, the restitution of the compromised barrier functions is difficult. This study investigates the regulation of TWIK-related potassium channel-1 (Trek1) in the restitution of intestinal epithelial barrier functions. The human colon epithelial cell line T84 was cultured in monolayers and used to observe epithelial barrier functions in vitro. An intestinal allergy mouse model was created. Cytokine levels were determined by enzyme-linked immunosorbent assay and western blotting. The results showed that Trek1 deficiency induced T84 monolayer barrier disruption. Allergic responses markedly suppressed the expression of Trek1 in the intestinal epithelia via activating the mitogen-activated protein kinase pathways and increasing the expression of histone deacetylase-1. The inhibition of histone deacetylase-1 by sodium butyrate or the administration of a butyrate-producing probiotic (Clostridium butyricum) restored the intestinal epithelial barrier functions and markedly enhanced the effect of antigen-specific immunotherapy. The data suggest that Trek1 is required for the maintenance of intestinal epithelial barrier integrity. Allergic responses induce an insufficiency of Trek1 expression in the intestinal epithelia. Trek1 expression facilitates the restoration of intestinal epithelial barrier functions in an allergic environment.
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Ácido Butírico/farmacologia , Clostridium butyricum/imunologia , Células Epiteliais/imunologia , Hipersensibilidade/terapia , Mucosa Intestinal/imunologia , Canais de Potássio de Domínios Poros em Tandem/imunologia , Probióticos/farmacologia , Animais , Linhagem Celular , Citocinas/genética , Citocinas/imunologia , Eosinófilos/efeitos dos fármacos , Eosinófilos/imunologia , Eosinófilos/patologia , Células Epiteliais/efeitos dos fármacos , Células Epiteliais/patologia , Regulação da Expressão Gênica , Histona Desacetilase 1/antagonistas & inibidores , Histona Desacetilase 1/genética , Histona Desacetilase 1/imunologia , Inibidores de Histona Desacetilases/farmacologia , Humanos , Ácidos Hidroxâmicos/farmacologia , Hipersensibilidade/genética , Hipersensibilidade/imunologia , Hipersensibilidade/patologia , Mucosa Intestinal/efeitos dos fármacos , Mucosa Intestinal/patologia , Mastócitos/efeitos dos fármacos , Mastócitos/imunologia , Mastócitos/patologia , Camundongos , Camundongos Endogâmicos BALB C , Proteínas Quinases Ativadas por Mitógeno/genética , Proteínas Quinases Ativadas por Mitógeno/imunologia , Ovalbumina , Canais de Potássio de Domínios Poros em Tandem/agonistas , Canais de Potássio de Domínios Poros em Tandem/genética , Transdução de SinaisRESUMO
Lineage-specific genes (LSGs) are defined as genes found in one particular taxonomic group but have no significant sequence similarity with genes from other lineages, which compose about 10%?20% of the total genes in the genome of a focal organism. LSGs were first uncovered in the yeast genome in 1996. The development of the whole genome sequencing leads to the emergence of studies on LSGs as a hot topic in comparative genomics. LSGs have been extensively studied on microbial species, lower marine organisms, plant (such as Arabidopsis thaliana, Oryza sativa, Populus), insects, primate, etc; the biological functions of LSGs are important to clarify the evolution and adaptability of a species. In this review, we summarize the progress of LSGs studies, including LSGs identification, gene characterization, origin and evolution of LSGs, biological function, and expression analysis of LSGs. In addition, we discuss the existing problems and future directions for studies in this area. Our purpose is to provide some unique insights into the researches of LSGs.
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Genes/fisiologia , Animais , Evolução Molecular , Humanos , Especificidade de ÓrgãosRESUMO
Restoration of the antigen (Ag)-specific immune tolerance in an allergic environment is refractory. B cells are involved in immune regulation. Whether B cells facilitate the generation of Ag-specific immune tolerance in an allergic environment requires further investigation. This paper aims to elucidate the mechanism by which B cells restore the Ag-specific immune tolerance in an allergic environment. In this study, a B cell-deficient mouse model was created by injecting an anti-CD20 antibody. The frequency of tolerogenic dendritic cell (TolDC) was assessed by flow cytometry. The levels of cytokines were determined by enzyme-linked immunosorbent assay. The expression of thrombospondin-1 (TSP1) was assessed by quantitative real-time RT-PCR, Western blotting, and methylation-specific PCR. The results showed that B cells were required in the generation of the TGF-ß-producing TolDCs in mice. B cell-derived TSP1 converted the latent TGF-ß to the active TGF-ß in DCs, which generated TGF-ß-producing TolDCs. Exposure to IL-13 inhibited the expression of TSP1 in B cells by enhancing the TSP1 gene DNA methylation. Treating food allergy mice with Ag-specific immunotherapy and IL-13 antagonists restored the generation of TolDCs and enhanced the effect of specific immunotherapy. In conclusion, B cells play a critical role in the restoration of specific immune tolerance in an allergic environment. Blocking IL-13 in an allergic environment facilitated the generation of TolDCs and enhanced the therapeutic effect of immunotherapy.