Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 8 de 8
Filter
1.
Clinics ; 76: e2484, 2021. tab, graf
Article in English | LILACS | ID: biblio-1153996

ABSTRACT

OBJECTIVES: To investigate the role of miR-139-5p and the TLR4/MyD88/NF-κB signaling pathway in acute lung injury in septic mice. METHOD: A total of 140 healthy male SPF C57BL/6 mice were divided into seven groups, i.e., Normal, Control, NC, miR-139-5p mimic, miR-139-5p inhibitor, TAK-242, and miR-139-5p inhibitor+TAK-242 groups. The levels of miR-139-5p, proteins related to the TLR4/MyD88/NF-κB signaling pathway (TLR4, MyD88, and p-NF-κB p50), and MPO, SOD, GSH, and MDA in lung tissue were measured. The lung tissue wet-to-dry mass ratio (W/D), arterial oxygen partial pressure (PaO2), and carbon dioxide partial pressure (PaCO2) were measured. RESULTS: A web-based bioinformatic tool predicted that MyD88 was a target of miR-139-5p, which was verified by a dual luciferase reporter assay. Compared with those in the Normal group, the levels of miR-139-5p, PaO2, SOD, and GSH were significantly lower, while those of TLR4, MyD88, p-NF-κB p50, W/D, PaCO2, IL-1β, TNF-α, IL-6, MPO, and MDA were higher in all other groups. Moreover, compared with their levels in the Control group, these indicators exhibited contrasting results in the miR-139-5p mimic and TAK-242 groups, but were similar in the miR-139-5p inhibitor group. In the miR-139-5p inhibitor+TAK-242 group, acute lung injury, aggravated by miR-139-5p inhibitor, was partially rescued by TAK-242. CONCLUSION: miR-139-5p inhibits the TLR4/MyD88/NF-κB signaling pathway to alleviate acute lung injury in septic mice.


Subject(s)
Animals , Male , Rats , Sepsis/genetics , MicroRNAs/genetics , Acute Lung Injury/genetics , Signal Transduction , NF-kappa B/metabolism , Toll-Like Receptor 4/genetics , Toll-Like Receptor 4/metabolism , Myeloid Differentiation Factor 88/genetics , Myeloid Differentiation Factor 88/metabolism , Mice, Inbred C57BL
2.
Article in English | WPRIM | ID: wpr-922760

ABSTRACT

Danshen-Chuanxiongqin Injection (DCI) is a commonly used traditional Chinese medicine for the treatment of cerebral ischemic stroke in China. However, its underlying mechanisms remain completely understood. The current study was designed to explore the protective mechanisms of DCI against cerebral ischemic stroke through integrating whole-transcriptome sequencing coupled with network pharmacology analysis. First, using a mouse model of cerebral ischemic stroke by transient middle cerebral artery occlusion (tMCAO), we found that DCI (4.10 mL·kg


Subject(s)
Brain Ischemia/genetics , Drugs, Chinese Herbal , Humans , Infarction, Middle Cerebral Artery/genetics , Ischemic Stroke , Myeloid Differentiation Factor 88/genetics , NF-kappa B/metabolism , Stroke/genetics , Toll-Like Receptor 2 , Toll-Like Receptor 4/metabolism
3.
Article in Chinese | WPRIM | ID: wpr-880144

ABSTRACT

OBJECTIVE@#To investigate the relationship between the polymorphism of miR-155 and its target gene MyD88 and clinicopathological features of diffuse large B-cell lymphoma (DLBCL).@*METHODS@#135 cases of DLBCL patients in our hospital from March 2015 to August 2017 were selected, and 90 cases of reactive hyperplasia of lymph nodes were selected as the control group. The relative expression of miR-155 and MyD88 gene polymorphism were detected in the two groups, and the relationship between miR-155 and MyD88 gene polymorphism and clinicopathological characteristics of DLBCL was analyzed.@*RESULTS@#The relative expression of miR-155 in DLBCL patients was significantly higher than that in the control group (P<0.05). The mutation rate of MyD88 L265P in DLBCL group was significantly higher than that in control group (P<0.05). The relative expression of miR-155 in patients with MyD88 L265P mutation was significantly higher than that in patients with wild-type DLBCL (P<0.05). The relative expression of miR-155 and the polymorphism of MyD88 L265P were associated with lesion location, stage, BCL-2 protein expression and MyD88 protein expression in DLBCL patients (t=7.461、8.804、6.487、10.812; χ@*CONCLUSION@#The abnormal expression of miR-155 and the mutation rate of MyD88 gene in DLBCL patients are increased, and the expression of miR-155 and the mutation of MyD88 gene affect the disease progression and prognosis of patients, which may be potential biological indicators for the diagnosis, treatment and prognosis of DLBCL.


Subject(s)
Humans , Lymphoma, Large B-Cell, Diffuse/genetics , MicroRNAs/genetics , Mutation , Myeloid Differentiation Factor 88/genetics , Polymorphism, Genetic , Prognosis
4.
Braz. dent. j ; 29(1): 43-47, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-888722

ABSTRACT

Abstract The aim of this study was to evaluate the expression of MMP2 and MMP9 during apical periodontitis (AP) progression in TLR2 (TLR2 KO) and in MyD88 (MyD88 KO) knockout mice compared to wild type (WT) mice. AP was induced in mandibular first molars of TLR2 KO (n= 18), MyD88 KO (n= 18), and WT mice (n= 18). After 7, 21, and 42 days, the animals were euthanized and the jaws were dissected and subjected to histotechnical processing. Subsequent sections were stained by immunohistochemistry and evaluated for detection of MMP2 and MMP9. Statistical analysis of the semi-quantitative analysis of immunohistochemistry was performed using chi-square test (α = 0.05). In the initial periods of AP progression, an increased expression of MMP9 in the TLR2 KO and MyD88 KO mice was observed. In the final periods of AP progression, a reduction of MMP2 expression and an increase of MMP9 expression in the TLR2 KO mice were observed. MMP2 and MMP9 production was modulated for TLR2 and MyD88 during apical periodontitis progression.


Resumo O objetivo deste estudo foi avaliar a expressão de MMP2 e MMP9 durante a progressão da periodontite apical (AP) em camundongos knockout para TLR2 (TLR2 KO) e MyD88 (MyD88 KO) comparados aos camundongos wild type (WT). A AP foi induzida nos primeiros molares inferiores dos camundongos TLR2 KO (n = 18), MyD88 KO (n = 18) e WT (n = 18). Após 7, 21 e 42 dias, os animais foram eutanaziados e as mandíbulas foram dissecadas e submetidas a processamento histotécnico. As lâminas foram coradas por imuno-histoquímica e analisadas para a detecção de MMP2 e MMP9. A análise estatística semi-quantitativa da imuno-histoquímica foi realizada pelo teste qui-quadrado (α = 0,05). Nos períodos iniciais de progressão AP, foi observada uma expressão aumentada de MMP9 nos camundongos TLR2 KO e MyD88 KO. Nos períodos finais de progressão AP, observou-se uma redução da expressão de MMP2 e um aumento da expressão de MMP9 nos camundongos TLR2 KO. A produção de MMP2 e MMP9 foi modulada por TLR2 e MyD88 durante a progressão da periodontite apical.


Subject(s)
Animals , Mice , Matrix Metalloproteinase 2/metabolism , Matrix Metalloproteinase 9/metabolism , Myeloid Differentiation Factor 88/physiology , Periapical Periodontitis/enzymology , Toll-Like Receptor 2/physiology , Disease Progression , Immunohistochemistry , Mice, Inbred C57BL , Mice, Knockout , Myeloid Differentiation Factor 88/genetics , Periapical Periodontitis/metabolism , Periapical Periodontitis/pathology
5.
São Paulo; s.n; s.n; 2016. 121 p. tab, graf, ilus.
Thesis in Portuguese | LILACS | ID: biblio-847505

ABSTRACT

As oncoproteínas E6 e E7 do Papilomavírus Humano (HPV) estão envolvidas na desregulação do sistema imune inato, provocando alterações na expressão dos receptores do tipo Toll (TLR). Considerando-se a função da via de sinalização iniciada por TLR, haveria uma vantagem para o vírus capaz de manipular a resposta desta via de modo que possa persistir nas células sem ser detectado pelo sistema imune ou ainda modulando essa resposta e criando um ambiente mais propício à manutenção da infecção. No entanto, muitos dos mecanismos que levam à eliminação da infecção ou persistência do HPV ainda são pouco conhecidos. O objetivo principal desse trabalho é investigar o papel das vias de TLR no processo de carcinogênese mediado por HPV. Inicialmente, foi analisada a expressão de genes da via de TLR em linhagens de tumores cervicais e em células expressando as oncoproteínas virais. Foram identificados vários genes diferencialmente expressos entre linhagens de células tumorais e queratinócitos normais, incluindo moléculas adaptadoras da via de TLR e genes associados à via da MAP quinase, ativação de NFkappaB e resposta imune antiviral. Cerca de 90% destes genes foram regulados negativamente. Entre eles, destacamos HMGB1, que apesar de possuir menos RNAm nas células tumorais possui um nível proteico muito maior, além de ter-se mostrado de grande importância para a viabilidade e proliferação das células tumorais, conforme demonstrado através de experimentos de supressão gênica. Em conjunto, os nossos dados indicam que E6 e E7 de HPVs de alto risco inibem proteínas da via de sinalização de TLR


Previous studies have shown that E6 and E7 HPV oncoproteins are involved in innate immune system dysregulation, causing alterations on Toll-like receptors (TLR) expression. Considering TLR pathway function, it would be advantageous for a virus to manipulate the response of this pathway so it can persist in cells without being detected by the immune system or to modulate this response to create a better environment for persistence of infection. However, many of the mechanisms leading to HPV infection clearance or persistence are still unknown and matter of active investigation. We analyzed in cervical cancer cell lines expression of genes from TLR pathway; several were differentially expressed between tumor cells lines and normal keratinocytes, including TLR adaptors molecules and genes associated with MAP kinase pathway, NFkappaB activation and antiviral immune response. About 90% of these genes were down regulated. Among them, we selected HMGB1 for further characterization due to its interference with tumor cell viability and proliferation. Altogether, our data indicate that high risk HPV E6 and E7 can inhibit TLR signaling pathway


Subject(s)
Papillomaviridae/pathogenicity , Toll-Like Receptor 1/analysis , Carcinogenesis/metabolism , Gene Expression , Immunity, Innate/immunology , Myeloid Differentiation Factor 88/genetics , Oncogene Proteins/pharmacokinetics
6.
Braz. j. med. biol. res ; 49(1): e4794, 2016. graf
Article in English | LILACS | ID: biblio-951643

ABSTRACT

Cardiac remodeling involves changes in heart shape, size, structure, and function after injury to the myocardium. The proinflammatory adaptor protein myeloid differentiation protein 88 (MyD88) contributes to cardiac remodeling. To investigate whether excessive MyD88 levels initiate spontaneous cardiac remodeling at the whole-organism level, we generated a transgenic MyD88 mouse model with a cardiac-specific promoter. MyD88 mice (male, 20-30 g, n=∼80) were born at the expected Mendelian ratio and demonstrated similar morphology of the heart and cardiomyocytes with that of wild-type controls. Although heart weight was unaffected, cardiac contractility of MyD88 hearts was mildly reduced, as shown by echocardiographic examination, compared with wild-type controls. Moreover, the cardiac dysfunction phenotype was associated with elevation of ANF and BNP expression. Collectively, our data provide novel evidence of the critical role of balanced MyD88 signaling in maintaining physiological function in the adult heart.


Subject(s)
Animals , Male , Rabbits , Ventricular Remodeling/physiology , Myeloid Differentiation Factor 88/metabolism , Heart Diseases/physiopathology , Organ Size , Mice, Transgenic , Echocardiography , Blotting, Western , Atrial Natriuretic Factor/metabolism , Natriuretic Peptide, Brain/metabolism , Myeloid Differentiation Factor 88/genetics , Organ Dysfunction Scores , Heart Diseases/metabolism , Heart Failure/physiopathology , Heart Failure/pathology , Myocardial Contraction/physiology , Myocardium/pathology
7.
Article in English | WPRIM | ID: wpr-206914

ABSTRACT

Toll-like receptor 5 (TLR5) is responsible for the recognition of bacterial flagellin in vertebrates. In the present study, the first TLR5 gene in duck was cloned. The open reading frame (ORF) of duck TLR5 (dTLR5) cDNA is 2580 bp and encodes a polypeptide of 859 amino acids. We also cloned partial sequences of myeloid differentiation factor 88, 2'-5'-oligoadenylate synthetase (OAS), and myxovirus resistance (Mx) genes from duck. dTLR5 mRNA was highly expressed in the bursa of Fabricius, spleen, trachea, lung, jejunum, rectum, and skin; moderately expressed in the muscular and glandular tissues, duodenum, ileum, caecum, and pancreas; and minimally expressed in the heart, liver, kidney, and muscle. DF-1 or HeLa cells transfected with DNA constructs encoding dTLR5 can activate NF-kappaB leading to the activation of interleukin-6 (IL-6) promoter. When we challenged ducks with a Herts33 Newcastle disease virus (NDV), mRNA transcription of the antiviral molecules Mx, Double stranded RNA activated protein kinase (PKR), and OAS was up-regulated in the liver, lung, and spleen 1 and 2 days post-inoculation.


Subject(s)
2',5'-Oligoadenylate Synthetase/genetics , Animals , Cell Line , Cloning, Molecular , Ducks , Gene Expression Regulation/physiology , Humans , Immunity, Innate , Myeloid Differentiation Factor 88/genetics , Myxovirus Resistance Proteins/genetics , Newcastle Disease/metabolism , Newcastle disease virus/classification , RNA, Messenger/genetics , Species Specificity , Toll-Like Receptor 5/genetics
8.
Article in English | WPRIM | ID: wpr-210397

ABSTRACT

Indoleamine 2,3-dioxygenase (IDO) is a key negative regulator of immune responses and has been implicated in tumor tolerance, autoimmune disease and asthma. IDO was detected in the joint synovial tissue in the inflammatory microenvironment of rheumatoid arthritis (RA), but IDO expression in joint synovial tissue is not sufficient to overcome the inflamed synovial environment. This study aimed to unravel the mechanisms involving the failure to activate tolerogenic IDO in the inflamed joint. We demonstrate that both poly (I:C) and lipopolysaccharide (LPS) induce expression of IDO in synovial fibroblasts. However, inflammatory cytokines such as IL-17, TNF-alpha, IL-12, IL-23 and IL-16 did not induce IDO expression. Poly (I:C) appeared to induce higher IDO expression than did LPS. Surprisingly, toll-like receptor (TLR)4-mediated IDO expression was upregulated after depletion of myeloid differentiation primary response protein 88 (MyD88) in synovial fibroblasts using small interfering RNA (siRNA). IDO, TLR3 and TLR4 were highly expressed in synovial tissue of RA patients compared with that of osteoarthritis patients. In addition, RA patients with severe disease activity had higher levels of expression of IDO, TLR3 and TLR4 in the synovium than patients with mild disease activity. These data suggest that upregulation of IDO expression in synovial fibroblasts involves TLR3 and TLR4 activation by microbial constituents. We showed that the mechanisms responsible for IDO regulation primarily involve MyD88 signaling in synovial fibroblasts, as demonstrated by siRNA-mediated knockdown of MyD88.


Subject(s)
Adaptor Proteins, Vesicular Transport/genetics , Arthritis, Rheumatoid/metabolism , Blotting, Western , Cells, Cultured , Fibroblasts/drug effects , Humans , Immunohistochemistry , Indoleamine-Pyrrole 2,3,-Dioxygenase/genetics , Interleukin-12/pharmacology , Interleukin-16/pharmacology , Interleukin-17/pharmacology , Interleukin-23/pharmacology , Lipopolysaccharides/pharmacology , Myeloid Differentiation Factor 88/genetics , Poly I-C/pharmacology , Polymerase Chain Reaction , RNA, Small Interfering/genetics , Synovial Membrane/cytology , Toll-Like Receptor 4/genetics , Tumor Necrosis Factor-alpha/pharmacology
SELECTION OF CITATIONS
SEARCH DETAIL