RESUMO
Human T-cell leukemia virus type 1 (HTLV-1) infection is linked to the development of adult T-cell leukemia/lymphoma (ATLL) and the neuroinflammatory disease, HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). The HTLV-1 Tax oncoprotein regulates viral gene expression and persistently activates NF-κB to maintain the viability of HTLV-1-infected T cells. Here, we utilize a kinome-wide shRNA screen to identify the tyrosine kinase KDR as an essential survival factor of HTLV-1-transformed cells. Inhibition of KDR specifically induces apoptosis of Tax expressing HTLV-1-transformed cell lines and CD4 + T cells from HAM/TSP patients. Furthermore, inhibition of KDR triggers the autophagic degradation of Tax resulting in impaired NF-κB activation and diminished viral transmission in co-culture assays. Tax induces the expression of KDR, forms a complex with KDR, and is phosphorylated by KDR. These findings suggest that Tax stability is dependent on KDR activity which could be exploited as a strategy to target Tax in HTLV-1-associated diseases.
Assuntos
Sobrevivência Celular , Produtos do Gene tax , Vírus Linfotrópico T Tipo 1 Humano , NF-kappa B , Paraparesia Espástica Tropical , Receptor 2 de Fatores de Crescimento do Endotélio Vascular , Humanos , Produtos do Gene tax/metabolismo , Produtos do Gene tax/genética , Vírus Linfotrópico T Tipo 1 Humano/patogenicidade , Vírus Linfotrópico T Tipo 1 Humano/genética , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/metabolismo , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/genética , NF-kappa B/metabolismo , Paraparesia Espástica Tropical/virologia , Paraparesia Espástica Tropical/metabolismo , Apoptose , Infecções por HTLV-I/virologia , Infecções por HTLV-I/metabolismo , Linfócitos T CD4-Positivos/virologia , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T/metabolismo , Linfócitos T/virologia , Leucemia-Linfoma de Células T do Adulto/virologia , Leucemia-Linfoma de Células T do Adulto/metabolismo , Leucemia-Linfoma de Células T do Adulto/genética , Leucemia-Linfoma de Células T do Adulto/patologia , Fosforilação , Células HEK293RESUMO
Human T-cell lymphotropic virus type-1 (HTLV-1) is the etiological agent of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). The endothelial breakdown and migration of leukocytes, including monocytes, to the spinal cord are involved in HAM/TSP development. Monocytes from HTLV-1-infected individuals exhibit important functional differences when compared to cells from uninfected donors. Using proteomic shot gun strategy, performed by nanoACQUITY-UPLC system, we analyzed monocytes isolated from peripheral blood of asymptomatic carriers (AC), HAM/TSP and uninfected individuals. 534 proteins were identified among which 376 were quantified by ExpressionE software. Our study revealed a panel of changes in protein expression linked to HTLV-1 infection. Upregulation of heat shock proteins and downregulation of canonical histone expression were observed in monocytes from HTLV-1-infected patients. Moreover, expression of cytoskeleton proteins was increased in monocytes from HTLV-1-infected patients, mainly in those from HAM/TSP, which was confirmed by flow cytometry and fluorescence microscopy. Importantly, functional assays demonstrated that monocytes from HAM/TSP patients present higher ability for adhesion and transmigration thought endothelium than those from AC and uninfected individuals. The major changes on monocyte protein profile were detected in HAM/TSP patients, suggesting that these alterations exert a relevant role in the establishment of HAM/TSP.
Assuntos
Infecções por HTLV-I/sangue , Infecções por HTLV-I/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Monócitos/metabolismo , Paraparesia Espástica Tropical/metabolismo , Paraparesia Espástica Tropical/virologia , Proteômica , Adulto , Adesão Celular , Movimento Celular , Citoesqueleto/metabolismo , Feminino , Histonas/metabolismo , Humanos , Masculino , Monócitos/citologia , Paraparesia Espástica Tropical/sangue , Regulação para Cima , Carga ViralRESUMO
Adult T-cell leukaemia/lymphoma (ATL) arises from chronic non-malignant human T lymphotropic virus type-1 (HTLV-1) infection which is characterized by high plasma pro-inflammatory cytokines whereas ATL is characterized by high plasma anti-inflammatory (IL-10) concentrations. The poor prognosis of ATL is partly ascribed to disease-associated immune suppression. ATL cells have a CD4+CCR4+CD26-CD7- immunophenotype but infected cells with this immunophenotype ('ATL-like' cells) are also present in non-malignant HTLV-1 infection. We hypothesized that 'ATL-like' and ATL cells have distinct cytokine producing capacity and a switch in the cytokines produced occurs during leukemogenesis. Seventeen asymptomatic carriers (ACs), 28 patients with HTLV-1-associated myelopathy (HAM) and 28 with ATL were studied. Plasma IL-10 concentration and the absolute frequency of IL-10-producing CD4+ T cells were significantly higher in patients with ATL compared to AC. IL-10-producing ATL cells were significantly more frequent than 'ATL-like' cells. The cytokine-producing cells were only a small fraction of ATL cells. Clonality analysis revealed that even in patients with ATL the ATL cells were composed not only of a single dominant clone (putative ATL cells) but also tens of non-dominant infected clones ('ATL-like' cells). The frequency of cytokine-producing cells showed a strong inverse correlation with the relative abundance of the largest clone in ATL cells suggesting that the putative ATL cells were cytokine non-producing and that the 'ATL-like' cells were the primary cytokine producers. These findings were confirmed by RNAseq with cytokine mRNA expression in ATL cells in patients with ATL (confirmed to be composed of both putative ATL and 'ATL-like' cells by TCR analysis) significantly lower compared to 'ATL-like' cells in patients with non-malignant HTLV-1 infection (confirmed to be composed of hundreds of non-dominant clones by TCR analysis). A significant inverse correlation between the relative abundance of the largest clone and cytokine mRNA expression was also confirmed. Finally, 'ATL-like' cells produced less pro- and more anti-inflammatory cytokines than non 'ATL-like' CD4+ cells (which are predominantly HTLV uninfected). In summary, HTLV-1 infection of CD4+ T cells is associated with a change in cytokine producing capacity and dominant malignant clonal growth is associated with loss of cytokine producing capacity. Non-dominant clones with 'ATL-like' cells contribute to plasma cytokine profile in patients with non-malignant HTLV-1 infection and are also present in patient with ATL.
Assuntos
Transformação Celular Viral/fisiologia , Citocinas/metabolismo , Infecções por HTLV-I/imunologia , Infecções por HTLV-I/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Leucemia-Linfoma de Células T do Adulto/virologia , Idoso , Idoso de 80 Anos ou mais , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Evolução Clonal/fisiologia , Estudos de Coortes , Citocinas/sangue , Citocinas/genética , Progressão da Doença , Feminino , Infecções por HTLV-I/patologia , Vírus Linfotrópico T Tipo 1 Humano/imunologia , Vírus Linfotrópico T Tipo 1 Humano/patogenicidade , Humanos , Imunofenotipagem , Leucemia-Linfoma de Células T do Adulto/imunologia , Leucemia-Linfoma de Células T do Adulto/metabolismo , Masculino , Pessoa de Meia-Idade , Paraparesia Espástica Tropical/imunologia , Paraparesia Espástica Tropical/metabolismo , Paraparesia Espástica Tropical/patologia , Paraparesia Espástica Tropical/virologia , Receptores de Antígenos de Linfócitos T alfa-beta/imunologia , Receptores de Antígenos de Linfócitos T alfa-beta/metabolismo , Carga ViralRESUMO
The main clinical feature of human T cell leukemia virus-1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is slowly progressive spastic paraparesis with bladder dysfunction. HAM/TSP is induced by chronic inflammation in the spinal cord, mainly the lower thoracic cord. A long-standing bystander mechanism, such as the destruction of surrounding tissues by the interaction between infiltrated Th1-like, HTLV-1-infected CD4+ T cells and HTLV-1-specific CD8+ cytotoxic T cells (CTL), is probably critical for the induction of chronic inflammation. Although the HTLV-1-infected CD4+ T cells in HAM/TSP appear to play a crucial role in the initial pathogenesis of HAM/TSP, the exact mechanisms of how these cells acquire their function as the first responders in the pathogenesis of HAM/TSP still remain unresolved. Herein, we propose the importance of the activation of both outside-in signals from integrin signaling and inside-out signals for integrin signaling in the HTLV-1-infected CD4+ T cells of HAM/TSP patients.
Assuntos
Linfócitos T CD4-Positivos/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Integrinas/fisiologia , Paraparesia Espástica Tropical/metabolismo , Transdução de Sinais , Linfócitos T CD4-Positivos/citologia , Linfócitos T CD4-Positivos/virologia , GTP Fosfo-Hidrolases/metabolismo , Interações Hospedeiro-Patógeno , Humanos , Paraparesia Espástica Tropical/virologia , Receptores CXCR4/metabolismo , Migração Transendotelial e TransepitelialRESUMO
To evaluate the spinal cord atrophy that occurs in HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), we conducted magnetic resonance imaging (MRI) and pathological analyses. In the MRI study, 15 patients with HAM/TSP and 20 age-matched normal control subjects were enrolled. Anteroposterior and transverse distances and cross-sectional areas were measured and calculated at the C2, C4, C6, T2, and T6 vertebral levels. In the pathological study, spinal cord autopsy specimens were compared between a HAM/TSP case and an adult T cell leukemia/lymphoma case. In both the MRI and pathological studies, HAM/TSP spinal cords demonstrated more severe atrophy in the anteroposterior direction than those of controls. The spinal cord atrophy and pathological changes in HAM/TSP occurred predominantly in the white matter, especially in the lateral columns. This is the first report indicating spinal cord atrophy in the anteroposterior direction using MRI. In pathological analysis, atrophy and pathological changes were prominent in areas of the spinal cord with slow blood flow. Hemodynamic and anatomical factors are speculated to be among the main mechanisms of atrophy in the anteroposterior direction.
Assuntos
Paraparesia Espástica Tropical/diagnóstico por imagem , Paraparesia Espástica Tropical/patologia , Medula Espinal/diagnóstico por imagem , Medula Espinal/patologia , Idoso , Atrofia , Feminino , Gliose/diagnóstico por imagem , Gliose/metabolismo , Gliose/patologia , Humanos , Imuno-Histoquímica , Leucemia de Células T/patologia , Imageamento por Ressonância Magnética , Masculino , Paraparesia Espástica Tropical/metabolismo , Estudos Retrospectivos , Medula Espinal/metabolismo , Vimentina/metabolismo , Substância Branca/diagnóstico por imagem , Substância Branca/metabolismo , Substância Branca/patologiaRESUMO
HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is an aggressive neurological disease. The CD4+CD25+ T cell population plays pivotal roles in the maintenance of immunological tolerance and prevention of such autoimmune diseases. In the current study, proviral load (PVL), factor forkhead box p3 (Foxp3), and glucocorticoid-induced tumor necrosis factor receptor-related protein (GITR) gene expression and regulatory T cells (Tregs) counts of 21 HAM/TSP patients and 16 HTLV-1 healthy carriers (ACs) were measured using real-time PCR, TaqMan method, and flow cytometry. The demographic, history of disease, and severity of myelopathy were assessed by a checklist and the Osame motor disability score (OMDS). The mean OMDS for HAM/TSP was 4.82 ± 2.37 which had no significant correlation with Treg count or the expression of Foxp3, GITR, and PVL. The CD4+CD25+ cell counts had no significant differences between HAM/TSP and ACs. Findings revealed a higher PVL in HAM/TSPs (313.36 copies/104) compared to ACs (144.93 copies/104, p = 0.035). The Foxp3 and GITR mRNA levels were lower in HAM/TSP patients (11.78 and 13.80, respectively) than those in healthy carriers (18.44 and 21.00, p = 0.041 and 0.03, respectively). There was a significant correlation between Treg frequency and Foxp3 gene expression (R = 0.67, p = 0.006) and GITR and Foxp3 (R = 0.84, p = 0.042) in HAM/TSP patients. Furthermore, the transcription factors have strong correlations with CD4+CD25+ T cell frequencies. These findings suggest that HTLV-1 infection can modify the expression of main functional transcription factors, FOXP3 and GITR, which may lead to immune response deterioration of Tregs and consequently HAM/TSP manifestation.
Assuntos
Fatores de Transcrição Forkhead/metabolismo , Proteína Relacionada a TNFR Induzida por Glucocorticoide/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Paraparesia Espástica Tropical/imunologia , Paraparesia Espástica Tropical/metabolismo , Linfócitos T Reguladores/metabolismo , Adulto , Estudos de Casos e Controles , Contagem de Células , Feminino , Fatores de Transcrição Forkhead/genética , Proteína Relacionada a TNFR Induzida por Glucocorticoide/genética , Humanos , Masculino , Pessoa de Meia-Idade , Paraparesia Espástica Tropical/genética , Linfócitos T Reguladores/citologia , Carga ViralRESUMO
Using a matched case-control design, we sought to determine whether the odds of konzo, a distinct spastic paraparesis associated with food (cassava) cyanogenic exposure in the tropics, were associated with lower cyanide detoxification rates (CDR) and malnutrition. Children with konzo (N=122, 5-17 years of age) were age- and sex-matched with presumably healthy controls (N=87) and assessed for motor and cognition performances, cyanogenic exposure, nutritional status, and cyanide detoxification rates (CDR). Cyanogenic exposure was ascertained by thiocyanate (SCN) concentrations in plasma (P-SCN) and urine (U-SCN). Children with a height-for-age z-score (HAZNCHS)<-2 were classified as nutritionally stunted. CDR was measured as time required to convert cyanide to SCN, and expressed as ms/µmol SCN/mg protein or as mmolSCN/ml plasma/min. Mean (SD) U-SCN in children with konzo was 521.9 (353.6) µmol/l and was, significantly higher than 384.6 (223.7) µmol/l in those without konzo. Conditional regression analysis of data for age- and sex- matched case-control pairs showed that konzo was associated with stunting (OR: 5.8; 95% CI: 2.7-12.8; p<0.01; N=83 paired groups) and higher U-SCN (OR: 1.1; 95% CI: 1.02-1.20 per 50-µmol increase in U-SCN; p=0.02; N=47 paired groups). After adjusting for stunting and U-SCN, the odds of developing konzo was reduced by 63% (95% CI: 11-85%, p=0.03; N=41 paired groups) for each 5mmol SCN/(ml plasma/min)-increase in CDR. Linear regression analysis indicated a significant association between BOT-2 or KABC-II scores and both the HAZNCHS z-score and the U-SCN concentration, but not the CDR. Our findings provide evidence in support of interventions to remove cyanogenic compounds from cassava prior to human consumption or, peharps, enhance the detoxification of cyanide in those relying on the cassava as the main source of food.
Assuntos
Cianetos/toxicidade , Paraparesia Espástica Tropical/induzido quimicamente , Sulfurtransferases/metabolismo , Adolescente , Análise de Variância , Estudos de Casos e Controles , Criança , Pré-Escolar , Transtornos Cognitivos/etiologia , Feminino , Humanos , Masculino , Transtornos Motores/etiologia , Nitrilas , Paraparesia Espástica Tropical/metabolismo , Estudos Retrospectivos , Estatísticas não ParamétricasRESUMO
Adult T-cell leukemia (ATL) and HTLV-1-associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP) are the two main diseases that are caused by the HTLV-1 virus. One of the features of HTLV-1 infection is its resistance against programmed cell death, which maintains the survival of cells to oncogenic transformation and underlies the viruses' therapeutic resistance. Two main genes by which the virus develops cancer are Tax and HBZ; playing an essential role in angiogenesis in regulating viral transcription and modulating multiple host factors as well as apoptosis pathways. Here we have reviewed by prior research how the apoptosis pathways are suppressed by the Tax and HBZ and new drugs which have been designed to deal with this suppression.
Assuntos
Apoptose , Fatores de Transcrição de Zíper de Leucina Básica/metabolismo , Produtos do Gene tax/metabolismo , Infecções por HTLV-I/virologia , Vírus Linfotrópico T Tipo 1 Humano/metabolismo , Leucemia-Linfoma de Células T do Adulto/virologia , Paraparesia Espástica Tropical/virologia , Proteínas dos Retroviridae/metabolismo , Animais , Antineoplásicos/uso terapêutico , Antivirais/uso terapêutico , Proteínas Reguladoras de Apoptose/metabolismo , Fatores de Transcrição de Zíper de Leucina Básica/genética , Transformação Celular Viral , Produtos do Gene tax/genética , Genoma Viral , Infecções por HTLV-I/tratamento farmacológico , Infecções por HTLV-I/metabolismo , Infecções por HTLV-I/patologia , Interações Hospedeiro-Patógeno , Vírus Linfotrópico T Tipo 1 Humano/efeitos dos fármacos , Vírus Linfotrópico T Tipo 1 Humano/genética , Vírus Linfotrópico T Tipo 1 Humano/patogenicidade , Humanos , Leucemia-Linfoma de Células T do Adulto/tratamento farmacológico , Leucemia-Linfoma de Células T do Adulto/metabolismo , Leucemia-Linfoma de Células T do Adulto/patologia , Paraparesia Espástica Tropical/tratamento farmacológico , Paraparesia Espástica Tropical/metabolismo , Paraparesia Espástica Tropical/patologia , Proteínas dos Retroviridae/genéticaRESUMO
The main feature of Human T-lymphotropic virus type I (HTLV-1) -associated myelopathy/tropical spastic paraparesis (HAM/TSP) pathogenesis is a virus-induced hyperactive immune response that produces chronic inflammation in the central nervous system (CNS), but the mechanism by which HTLV-1 deregulates the immune response is unknown. We recently reported a high frequency of HTLV-1-infected CCR4+ cells, including regulatory T cells. We showed that HTLV-1 induces a Th1-like state in these CCR4+ cells via T-bet expression. We have also found that CXCL10 plays an important role in a positive feedback loop that maintains inflammation in the CNS. Astrocytes, which were found to be the main producers of CXCL10 in the CNS, are another key player in the loop. In short, we postulate that infected CCR4+ Th1-like T cells produce interferon-γ, which stimulates astrocytes to produce CXCL10. We now have a much better understanding of the molecular mechanisms at play in HAM/TSP pathogenesis.
Assuntos
Astrócitos/metabolismo , Linfócitos T CD4-Positivos/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/metabolismo , Paraparesia Espástica Tropical/metabolismo , Receptores CCR4/metabolismo , Células Th1/metabolismo , Astrócitos/imunologia , Linfócitos T CD4-Positivos/imunologia , Quimiocina CXCL10/imunologia , Quimiocina CXCL10/metabolismo , Ensaios Clínicos como Assunto/métodos , Retroalimentação Fisiológica/fisiologia , Vírus Linfotrópico T Tipo 1 Humano/imunologia , Humanos , Inflamação/imunologia , Inflamação/metabolismo , Paraparesia Espástica Tropical/imunologia , Receptores CCR4/imunologia , Células Th1/imunologiaRESUMO
Pathology of HTLV-1 associated myelopathy/Tropical spastic paraparesis (HAM/TSP) is believed to be the result of "bystander damage" involving effector CD8 (+) T lymphocytes (CTLs) killing of virus infected cells. But the specific cellular events leading up to tissue injury are still unclear. Here, we developed the Microscopy Imaging of Cytotoxic T lymphocyte assay with Fluorescence emission (MI-CaFé), an optimized visualization analysis to explore the interactions between CTLs and virus infected or viral antigen presenting target cells. Various cell-to-cell formations can be observed and our results demonstrate elevated frequencies of CTL-target cell conjugates in HAM/TSP patient PBMCs compared to control PBMCs. Furthermore, HTLV-1 Tax protein expression can be localized at the cell-cell junctions and also tracked moving from an infected cell to a CD14 (+) mononuclear phagocyte (MP). Activation of CD14 (+) MPs in HAM/TSP patient PBMCs and antigenic presentation of HTLV-1 Tax by MPs can be inferred by their spontaneous cytotoxicity after 18h of in vitro culture. Given that CD4 (+) T lymphocytes are the primary reservoirs of HTLV-1 and MPs are scavenger cells responsible for pathogen clearance, spontaneous cytotoxicity against MPs in HAM/TSP PBMCs suggests a mechanism of chronic inflammation, secondary to low level of persistent virus infection within the central nervous system.
Assuntos
Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Leucócitos Mononucleares/metabolismo , Paraparesia Espástica Tropical/metabolismo , Fagócitos/metabolismo , Células Cultivadas , Feminino , Humanos , Leucócitos Mononucleares/imunologia , Pessoa de Meia-Idade , Doenças do Sistema Nervoso/imunologia , Doenças do Sistema Nervoso/metabolismo , Paraparesia Espástica Tropical/imunologia , Fagócitos/imunologiaRESUMO
HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is an immune mediated myelopathy caused by the human T-lymphotropic virus type 1 (HTLV-1). The efficacy of treatments used for patients with HAM/TSP is uncertain. The aim of this study is to document the efficacy of pulsed methylprednisolone in patients with HAM/TSP. Data from an open cohort of 26 patients with HAM/TSP was retrospectively analysed. 1g IV methylprednisolone was infused on three consecutive days. The outcomes were pain, gait, urinary frequency and nocturia, a range of inflammatory markers and HTLV-1 proviral load. Treatment was well tolerated in all but one patient. Significant improvements in pain were: observed immediately, unrelated to duration of disease and maintained for three months. Improvement in gait was only seen on Day 3 of treatment. Baseline cytokine concentrations did not correlate to baseline pain or gait impairment but a decrease in tumour necrosis factor-alpha (TNF-α) concentration after pulsed methylprednisolone was associated with improvements in both. Until compared with placebo, treatment with pulsed methylprednisolone should be offered to patients with HAM/TSP for the treatment of pain present despite regular analgesia.
Assuntos
Metilprednisolona/farmacologia , Dor/complicações , Dor/tratamento farmacológico , Paraparesia Espástica Tropical/complicações , Paraparesia Espástica Tropical/tratamento farmacológico , Adulto , Idoso , Citocinas/metabolismo , Feminino , Vírus Linfotrópico T Tipo 1 Humano/efeitos dos fármacos , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Humanos , Masculino , Metilprednisolona/uso terapêutico , Pessoa de Meia-Idade , Paraparesia Espástica Tropical/metabolismo , Paraparesia Espástica Tropical/fisiopatologia , Estudos Retrospectivos , Micção/efeitos dos fármacos , Carga Viral/efeitos dos fármacos , CaminhadaRESUMO
Human lymphotropic virus type 1 (HTLV-1) is a retrovirus causing HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), a neurodegenerative central nervous system (CNS) axonopathy. This virus mainly infects CD4(+) T lymphocytes without evidence of neuronal infection. Viral Tax, secreted from infected lymphocytes infiltrated in the CNS, is proposed to alter intracellular pathways related to axonal cytoskeleton dynamics, producing neurological damage. Previous reports showed a higher proteolytic release of soluble Semaphorin 4D (sSEMA-4D) from CD4(+) T cells infected with HTLV-1. Soluble SEMA-4D binds to its receptor Plexin-B1, activating axonal growth collapse pathways in the CNS. In the current study, an increase was found in both SEMA-4D in CD4(+) T cells and sSEMA-4D released to the culture medium of peripheral blood mononuclear cells (PBMCs) from HAM/TSP patients compared to asymptomatic carriers and healthy donors. After a 16-h culture, infected PBMCs showed significantly higher levels of CRMP-2 phosphorylated at Ser(522). The effect was blocked either with anti-Tax or anti-SEMA-4D antibodies. The interaction of Tax and sSEMA-4D was found in secreted medium of PBMCs in patients, which might be associated with a leading role of Tax with the SEMA-4D-Plexin-B1 signaling pathway. In infected PBMCs, the migratory response after transwell assay showed that sSEMA-4D responding cells were CD4(+)Tax(+) T cells with a high CRMP-2 pSer(522) content. In the present study, the participation of Tax-sSEMA-4D in the reduction in neurite growth in PC12 cells produced by MT2 (HTLV-1-infected cell line) culture medium was observed. These results lead to the participation of plexins in the reported effects of infected lymphocytes on neuronal cells.
Assuntos
Antígenos CD/genética , Produtos do Gene tax/genética , Vírus Linfotrópico T Tipo 1 Humano/metabolismo , Leucócitos Mononucleares/metabolismo , Neuritos/efeitos dos fármacos , Paraparesia Espástica Tropical/metabolismo , Semaforinas/genética , Animais , Anticorpos Neutralizantes/farmacologia , Antígenos CD/metabolismo , Portador Sadio , Estudos de Casos e Controles , Movimento Celular/efeitos dos fármacos , Meios de Cultivo Condicionados/farmacologia , Regulação da Expressão Gênica , Produtos do Gene tax/metabolismo , Vírus Linfotrópico T Tipo 1 Humano/genética , Humanos , Células K562 , Leucócitos Mononucleares/patologia , Leucócitos Mononucleares/virologia , Proteínas do Tecido Nervoso/genética , Proteínas do Tecido Nervoso/metabolismo , Neuritos/metabolismo , Neuritos/ultraestrutura , Células PC12 , Paraparesia Espástica Tropical/genética , Paraparesia Espástica Tropical/patologia , Paraparesia Espástica Tropical/virologia , Cultura Primária de Células , Ratos , Receptores de Superfície Celular/genética , Receptores de Superfície Celular/metabolismo , Semaforinas/metabolismo , Transdução de SinaisAssuntos
Infecções por HTLV-I/etiologia , Paraparesia Espástica Tropical , Astrócitos/metabolismo , Biomarcadores/análise , Progressão da Doença , Humanos , Paraparesia Espástica Tropical/complicações , Paraparesia Espástica Tropical/diagnóstico , Paraparesia Espástica Tropical/metabolismo , Paraparesia Espástica Tropical/terapia , PrognósticoRESUMO
In previous studies of human T-lymphotropic virus type 1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), areas of slow blood flow in the spinal cord were related to pathological changes. While the pathological changes in the brain are milder than those in the spinal cord, they are also more significant in sites with slow blood flow. In this study, we investigated brain glucose metabolism in slow blood flow areas using fluorine-18 fluorodeoxyglucose positron emission tomography ((18)F-FDG-PET). Clinical features and brain (18)F-FDG-PET parameters were analyzed in six patients with HAM/TSP. For comparison of PET data, eight healthy volunteers were enrolled as normal controls (NLs). Glucose metabolism in the watershed areas of the middle and posterior cerebral arteries, as compared with that in the occipital lobes as a control, was significantly lower in HAM/TSP patients than in NLs. This result confirmed the relationship between slow blood flow areas and hypometabolism in HAM/TSP, and is consistent with previous findings that pathological changes are accentuated in sites with slow blood flow.
Assuntos
Encéfalo/metabolismo , Glucose/metabolismo , Paraparesia Espástica Tropical/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Velocidade do Fluxo Sanguíneo/fisiologia , Encéfalo/diagnóstico por imagem , Artérias Cerebrais/metabolismo , Circulação Cerebrovascular/fisiologia , Feminino , Fluordesoxiglucose F18 , Humanos , Masculino , Pessoa de Meia-Idade , Imagem Multimodal , Paraparesia Espástica Tropical/diagnóstico , Paraparesia Espástica Tropical/diagnóstico por imagem , Tomografia por Emissão de Pósitrons , Compostos Radiofarmacêuticos , Fluxo Sanguíneo Regional/fisiologia , Estudos Retrospectivos , Tomografia Computadorizada por Raios XRESUMO
BACKGROUND: HTLV-1 causes proliferation of clonal populations of infected T cells in vivo, each clone defined by a unique proviral integration site in the host genome. The proviral load is strongly correlated with odds of the inflammatory disease HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). There is evidence that asymptomatic HTLV-1 carriers (ACs) have a more effective CD8 + T cell response, including a higher frequency of HLA class I alleles able to present peptides from a regulatory protein of HTLV-1, HBZ. We have previously shown that specific features of the host genome flanking the proviral integration site favour clone survival and spontaneous expression of the viral transactivator protein Tax in naturally infected PBMCs ex vivo. However, the previous studies were not designed or powered to detect differences in integration site characteristics between ACs and HAM/TSP patients. Here, we tested the hypothesis that the genomic environment of the provirus differs systematically between ACs and HAM/TSP patients, and between individuals with strong or weak HBZ presentation. METHODS: We used our recently described high-throughput protocol to map and quantify integration sites in 95 HAM/TSP patients and 68 ACs from Kagoshima, Japan, and 75 ACs from Kumamoto, Japan. Individuals with 2 or more HLA class I alleles predicted to bind HBZ peptides were classified 'strong' HBZ binders; the remainder were classified 'weak binders'. RESULTS: The abundance of HTLV-1-infected T cell clones in vivo was correlated with proviral integration in genes and in areas with epigenetic marks associated with active regulatory elements. In clones of equivalent abundance, integration sites in genes and active regions were significantly more frequent in ACs than patients with HAM/TSP, irrespective of HBZ binding and proviral load. Integration sites in genes were also more frequent in strong HBZ binders than weak HBZ binders. CONCLUSION: Clonal abundance is correlated with integration in a transcriptionally active genomic region, and these regions may promote cell proliferation. A clone that reaches a given abundance in vivo is more likely to be integrated in a transcriptionally active region in individuals with a more effective anti-HTLV-1 immune response, such those who can present HBZ peptides or those who remain asymptomatic.
Assuntos
Regulação da Expressão Gênica/fisiologia , Vírus Linfotrópico T Tipo 1 Humano/metabolismo , Paraparesia Espástica Tropical/virologia , Fatores de Transcrição de Zíper de Leucina Básica/genética , Fatores de Transcrição de Zíper de Leucina Básica/metabolismo , Portador Sadio , Epitopos , Genes MHC Classe I/genética , Genes MHC Classe I/fisiologia , Predisposição Genética para Doença , Vírus Linfotrópico T Tipo 1 Humano/genética , Humanos , Paraparesia Espástica Tropical/genética , Paraparesia Espástica Tropical/metabolismo , Ligação Proteica , Proteínas dos Retroviridae , Carga Viral , Proteínas Virais/genética , Proteínas Virais/metabolismoRESUMO
HTLV-1 is a human retrovirus that is associated with the neuroinflammatory disorder HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP). In these patients, HTLV-1 is primarily found in the CD4(+)CD25(+) T cell subset (Regulatory T cells:Tregs), which is responsible for peripheral immune tolerance and is known to be dysfunctional in HAM/TSP. Recent evidence suggests that FoxP3 expression and function is determined epigenetically through DNA demethylation in the Treg-specific demethylated region (TSDR). We analyzed the methylation of the TSDR in PBMCs, CD4(+) T cells, and CD4(+)CD25(+) T cells from normal healthy donors (NDs) and HAM/TSP patients. We demonstrated that there is decreased demethylation in analyzed PBMCs and CD4(+)CD25(+) T cells from HAM/TSP patients as compared to NDs. Furthermore, decreased TSDR demethylation was associated with decreased functional suppression by Tregs. Additionally, increased HTLV-1 Tax expression in HAM/TSP PBMC culture correlated with a concomitant decline in FoxP3 TSDR demethylation. Overall, we suggest that HTLV-1 infection decreases Treg functional suppressive capacity in HAM/TSP through modification of FoxP3 TSDR demethylation and that dysregulated Treg function may contribute to HAM/TSP disease pathogenesis.
Assuntos
Metilação de DNA , Epigênese Genética , Fatores de Transcrição Forkhead/metabolismo , Paraparesia Espástica Tropical/genética , Paraparesia Espástica Tropical/metabolismo , Linfócitos T Reguladores/imunologia , Adulto , Idoso , Linfócitos T CD4-Positivos/metabolismo , Estudos de Casos e Controles , Células Cultivadas , Feminino , Produtos do Gene tax/biossíntese , Humanos , Leucócitos Mononucleares/metabolismo , Masculino , Pessoa de Meia-Idade , Subpopulações de Linfócitos T/metabolismo , Linfócitos T Reguladores/metabolismo , Linfócitos T Reguladores/patologiaRESUMO
Human T lymphotropic virus type I (HTLV-1) is the etiological agent of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). CD8+ T cells may contribute to the protection or development of HAM/TSP. In this study we used SAGE methodology to screen for differentially expressed genes in CD8+ T cells isolated from HTLV-1 asymptomatic carriers (HAC) and from HAM/TSP patients to identify genes involved in HAM/TSP development. SAGE analysis was conducted by pooling samples according to clinical status. The comparison of gene expression profiles between HAC and HAM/TSP libraries identified 285 differentially expressed tags. We focus on cytotoxicity and cytokine-related genes due to their potential biological role in HTLV-1 infection. Our results showed that patients with HAM/TSP have high expression levels of degranulation-related genes, namely GZMH and PRF1, and of the cytoskeletal adaptor PXN. We found that GZMB and ZAP70 were overexpressed in HTLV-infected patients compared to the noninfected group. We also detected that CCL5 was higher in the HAM/TSP group compared to the HAC and CT groups. Our findings showed that CD8+ T cells of HAM/TSP patients have an inflammatory and active profile. PXN and ZAP70 overexpression in HTLV-1-infected patients was described for the first time here and reinforces this concept. However, although active and abundant, CD8+ T cells are not able to completely eliminate infected cells and prevent the development of HAM/TSP and, moreover, these cells might contribute to the pathogenesis of the disease by migrating to the central nervous system (CNS). These results should be further tested with biological functional assays to increase our understanding on the role of these molecules in the development of HTLV-1-related diseases.
Assuntos
Linfócitos T CD8-Positivos/virologia , Infecções por HTLV-I/imunologia , Vírus Linfotrópico T Tipo 1 Humano/fisiologia , Paraparesia Espástica Tropical/virologia , Adulto , Idoso , Infecções Assintomáticas , Linfócitos T CD8-Positivos/metabolismo , Linfócitos T CD8-Positivos/fisiologia , Citocinas/genética , Citocinas/metabolismo , Feminino , Citometria de Fluxo , Perfilação da Expressão Gênica , Regulação Viral da Expressão Gênica/genética , Regulação Viral da Expressão Gênica/fisiologia , Granzimas/genética , Granzimas/metabolismo , Infecções por HTLV-I/virologia , Humanos , Masculino , Pessoa de Meia-Idade , Paraparesia Espástica Tropical/imunologia , Paraparesia Espástica Tropical/metabolismo , Paxilina/genética , Paxilina/metabolismo , Perforina , Proteínas Citotóxicas Formadoras de Poros/genética , Proteínas Citotóxicas Formadoras de Poros/metabolismo , Reação em Cadeia da Polimerase em Tempo Real , Adulto Jovem , Proteína-Tirosina Quinase ZAP-70/genética , Proteína-Tirosina Quinase ZAP-70/metabolismoRESUMO
The retrovirus human T lymphotropic virus type 1 (HTLV-1) promotes spastic paraparesis, adult T cell leukaemia and other diseases. Recently, some human microRNAs (miRNAs) have been described as important factors in host-virus interactions. This study compared miRNA expression in control individuals, asymptomatic HTLV-1 carriers and HTLV-1 associated myelopathy (HAM)/tropical spastic paraparesis patients. The proviral load and Tax protein expression were measured in order to characterize the patients. hsa-miR-125b expression was significantly higher in patients than in controls (p = 0.0285) or in the HAM group (p = 0.0312). Therefore, our findings suggest that miR-125b expression can be used to elucidate the mechanisms of viral replication and pathogenic processes.
Assuntos
Produtos do Gene tax/metabolismo , MicroRNAs/metabolismo , Paraparesia Espástica Tropical/metabolismo , Adulto , Biomarcadores/metabolismo , Portador Sadio , Estudos de Casos e Controles , Feminino , Citometria de Fluxo , Vírus Linfotrópico T Tipo 1 Humano/crescimento & desenvolvimento , Humanos , Masculino , Pessoa de Meia-Idade , Paraparesia Espástica Tropical/virologia , Regulação para Cima , Carga Viral , Replicação ViralRESUMO
The retrovirus human T lymphotropic virus type 1 (HTLV-1) promotes spastic paraparesis, adult T cell leukaemia and other diseases. Recently, some human microRNAs (miRNAs) have been described as important factors in host-virus interactions. This study compared miRNA expression in control individuals, asymptomatic HTLV-1 carriers and HTLV-1 associated myelopathy (HAM)/tropical spastic paraparesis patients. The proviral load and Tax protein expression were measured in order to characterize the patients. hsa-miR-125b expression was significantly higher in patients than in controls (p = 0.0285) or in the HAM group (p = 0.0312). Therefore, our findings suggest that miR-125b expression can be used to elucidate the mechanisms of viral replication and pathogenic processes.
Assuntos
Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Produtos do Gene tax/metabolismo , MicroRNAs/metabolismo , Paraparesia Espástica Tropical/metabolismo , Biomarcadores/metabolismo , Portador Sadio , Estudos de Casos e Controles , Citometria de Fluxo , Vírus Linfotrópico T Tipo 1 Humano/crescimento & desenvolvimento , Paraparesia Espástica Tropical/virologia , Regulação para Cima , Carga Viral , Replicação ViralRESUMO
Human T-lymphotropic virus type 1 (HTLV-1) is a retrovirus that persists lifelong in the host. In â¼4% of infected people, HTLV-1 causes a chronic disabling neuroinflammatory disease known as HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). The pathogenesis of HAM/TSP is unknown and treatment remains ineffective. We used gene expression microarrays followed by flow cytometric and functional assays to investigate global changes in blood transcriptional profiles of HTLV-1-infected and seronegative individuals. We found that perturbations of the p53 signaling pathway were a hallmark of HTLV-1 infection. In contrast, a subset of interferon (IFN)-stimulated genes was over-expressed in patients with HAM/TSP but not in asymptomatic HTLV-1 carriers or patients with the clinically similar disease multiple sclerosis. The IFN-inducible signature was present in all circulating leukocytes and its intensity correlated with the clinical severity of HAM/TSP. Leukocytes from patients with HAM/TSP were primed to respond strongly to stimulation with exogenous IFN. However, while type I IFN suppressed expression of the HTLV-1 structural protein Gag it failed to suppress the highly immunogenic viral transcriptional transactivator Tax. We conclude that over-expression of a subset of IFN-stimulated genes in chronic HTLV-1 infection does not constitute an efficient host response but instead contributes to the development of HAM/TSP.