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HTLV Myelopathy

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https://www.readbyqxmd.com/read/28426803/dendritic-cell-maturation-but-not-type-i-interferon-exposure-restricts-infection-by-htlv-1-and-viral-transmission-to-t-cells
#1
Gergès Rizkallah, Sandrine Alais, Nicolas Futsch, Yuetsu Tanaka, Chloé Journo, Renaud Mahieux, Hélène Dutartre
Human T lymphotropic Virus type 1 (HTLV-1) is the etiological agent of Adult T cell Leukemia/Lymphoma (ATLL) and HTLV-1-Associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). Both CD4+ T-cells and dendritic cells (DCs) infected with HTLV-1 are found in peripheral blood from HTLV-1 carriers. We previously demonstrated that monocyte-derived IL-4 DCs are more susceptible to HTLV-1 infection than autologous primary T-cells, suggesting that DC infection precedes T-cell infection. However, during blood transmission, breast-feeding or sexual transmission, HTLV-1 may encounter different DC subsets present in the blood, the intestinal or genital mucosa respectively...
April 20, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28420387/effects-of-host-restriction-factors-and-the-htlv-1-subtype-on-susceptibility-to-htlv-1-associated-myelopathy-tropical-spastic-paraparesis
#2
Satoshi Nozuma, Eiji Matsuura, Daisuke Kodama, Yuichi Tashiro, Toshio Matsuzaki, Ryuji Kubota, Shuji Izumo, Hiroshi Takashima
BACKGROUND: Although human T-lymphotropic virus type 1 (HTLV-1) infection is a prerequisite for the development of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), specific provirus mutations in HAM/TSP have not yet been reported. In this study, we examined whether HAM/TSP patients had the disease-specific genomic variants of HTLV-1 by analyzing entire sequences of HTLV-1 proviruses in these patients, including familial cases. In addition, we investigated the genetic variants of host restriction factors conferring antiretroviral activity to determine which mutations may be related to resistance or susceptibility to HAM/TSP...
April 19, 2017: Retrovirology
https://www.readbyqxmd.com/read/28410448/il17a-polymorphism-is-not-associated-with-human-t-lymphotropic-virus-1-associated-myelopathy-tropical-spastic-paraparesis
#3
Heytor V P C Neco, Vanessa G S Teixeira, Ana C L Trindade, Paula M R Magalhães, Virgínia M B Lorena, Luydson R Vasconcelos, Patricia M M F Moura, Clarice N L Morais
The human T-lymphotropic virus 1 (HTLV-1) is the causative agent of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). The present study investigated the association between the rs2275913 polymorphism in the IL17A gene and the development of HAM/TSP. Peripheral blood samples were collected from 116 patients (29 symptomatic patients with HAM/TSP and 87 asymptomatic) with a positive diagnosis of HTLV-1. The single nucleotide polymorphism genotyping was carried out by real time quantitative PCR (RT-qPCR) using TaqMan(®) probes...
April 14, 2017: Viral Immunology
https://www.readbyqxmd.com/read/28384290/mait-cells-are-reduced-in-frequency-and-functionally-impaired-in-human-t-lymphotropic-virus-type-1-infection-potential-clinical-implications
#4
Dominic Paquin-Proulx, Benjamin C Greenspun, Emanuela A S Costa, Aluisio C Segurado, Esper G Kallas, Douglas F Nixon, Fabio E Leal
HTLV-1 infection is associated with several inflammatory disorders, including the neurodegenerative condition HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). It is unclear why a minority of infected subjects develop HAM/TSP. The cellular immune response has been implicated in the development of inflammatory alterations in these patients; however the pathogenic mechanisms for disease progression remain unclear. Furthermore, HTLV-1-infected individuals have an increase incidence of Mycobacterium tuberculosis (Mtb) infection, suggesting that immunological defect are associated with HTLV-1 infection...
2017: PloS One
https://www.readbyqxmd.com/read/28384180/silent-dissemination-of-htlv-1-in-an-endemic-area-of-argentina-epidemiological-and-molecular-evidence-of-intrafamilial-transmission
#5
María C Frutos, Rene Gastaldello, Marcos Balangero, Carlos Remondegui, Sebastián Blanco, Koko Otsuki, Ana Carolina Paulo Vicente, David Elías, Arnaldo Mangeaud, Silvia Nates, Sandra Gallego
BACKGROUND: Molecular and epidemiological studies of transmission routes and risk factors for infection by HTLV-1 are extremely important in order to implement control measures, especially because of the high prevalence of HTLV-1 in several regions of the world. San Salvador de Jujuy, Northwest Argentina, is a highly endemic area for HTLV-1 and foci of tropical spastic paraparesis/HTLV-1-associated myelopathy. OBJECTIVE: To gain further insight into the role of intrafamilial transmission of HTLV-1 in a highly endemic region in Argentina...
2017: PloS One
https://www.readbyqxmd.com/read/28380116/clinical-and-laboratory-features-of-htlv-i-asymptomatic-carriers-and-patients-with-htlv-i-associated-myelopathy-tropical-spastic-paraparesis-from-the-brazilian-amazon
#6
Massanobu Takatani, Myuki Esashika Crispim, Nelson Fraiji, Mariane Martins Araujo Stefani, Dagmar Kiesslich
Clinical and laboratory parameters including blood and cerebrospinal fluid (CSF) neopterin were investigated in human-T-lymphotropic-virus-type-I associated-myelopathy/tropical-spastic-paraparesis-HAM/TSP and in HTLV-I carriers. HAM/TSP (n = 11, 2 males/9 females, median age = 48 years), recently diagnosed HTLV-I carriers (n = 21, 15 females/6 males, median age = 44 years), healthy individuals (n = 20, 10 males/10 females, median age = 34.6 years) from the Brazilian Amazon (Manaus, Amazonas State) were investigated...
April 3, 2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28378248/role-of-il-21-in-htlv-1-infections-with-emphasis-on-htlv-1-associated-myelopathy-tropical-spastic-paraparesis-ham-tsp
#7
Taraneh Rajaei, Hamid Farajifard, Houshang Rafatpanah, Reza Bustani, Narges Valizadeh, Bahareh Rajaei, Seyed Abdolrahim Rezaee
Interleukin-21 (IL-21) enhances the survival and cytotoxic properties of cytotoxic T cells (CTLs) and exhibits essential roles in controlling chronic viral infections. HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is a chronic progressive inflammatory disease of the nervous system. The main determinant of disease progression is efficiency of the CTL response to Human T lymphotropic virus types I (HTLV-1). In this study, the expression of host IL-21 and HTLV-I Tax and proviral load (PVL) was evaluated to understand the role and mechanism of IL-21 in HTLV-1 infections and the subsequent development of HAM/TSP...
April 4, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/28376092/cytokine-profile-and-proviral-load-among-japanese-immigrants-and-non-japanese-infected-with-htlv-1-in-a-non-endemic-area-of-brazil
#8
João Américo Domingos, Luana Silva Soares, Larissa M Bandeira, Camila Mareti Bonin, Ana C P Vicente, Louise Zanella, Marco Antonio Moreira Puga, Inês Aparecida Tozetti, Ana Rita Coimbra Motta-Castro, Rivaldo Venâncio da Cunha
The lifetime risk of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) development differs among ethnic groups. To better understand these differences, this prospective cohort study was conducted to investigate the cytokine profile and the HTLV-1 proviral load (PVL) in Japanese and non-Japanese populations with HAM/TSP and asymptomatic carriers (ACs). The serum IL-2, IL-4, IL-6, IL-10, IL-17, TNF-α, and IFN-γ levels were quantified using the Cytometric Bead Array in 40 HTLV-1-infected patients (11 HAM/TSP and 29 ACs) and 18 healthy controls (HCs) in Brazil...
2017: PloS One
https://www.readbyqxmd.com/read/28374110/htlv-1-infection-and-neuropathogenesis-in-the-context-of-rag1-%C3%AE-c-rag1-hu-and-blt-mice
#9
Rashida Ginwala, Breanna Caruso, Zafar K Khan, Ajinkya Pattekar, Glen M Chew, Michael J Corley, Ronak Loonawat, Steven Jacobson, Sreesha Sreedhar, Lishomwa C Ndhlovu, Pooja Jain
To date, the lack of a suitable small animal model has hindered our understanding of Human T-cell lymphotropic virus (HTLV)-1 chronic infection and associated neuropathogenesis defined as HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). The host immune response plays a critical role in the outcome of HTLV-1 infection, which could be better tested in the context of humanized (hu) mice. Thus, we employ here the Balb/c-Rag1(-/-)γc(-/-) or Rag1 as well as Bone marrow-Liver-Thymic (BLT) mouse models for engraftment of human CD34(+) hematopoietic stem cells...
April 4, 2017: Journal of Neuroimmune Pharmacology: the Official Journal of the Society on NeuroImmune Pharmacology
https://www.readbyqxmd.com/read/28357658/serological-and-molecular-methods-to-study-epidemiological-aspects-of-human-t-cell-lymphotropic-virus-type-1-infection
#10
Olivier Cassar, Antoine Gessain
We estimated that at least 5-10 million individuals are infected with HTLV-1. Importantly, this number is based on the study of nearly 1.5 billion people living in known human T-cell lymphotropic virus type 1 (HTLV-1) endemic areas, for which reliable epidemiological data are available. However, for some highly populated regions including India, the Maghreb, East Africa, and some regions of China, no consistent data are yet available which prevents a more accurate estimation. Thus, the number of HTLV-1 infected people in the world is probably much higher...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28343405/htlv-1-associated-myelopathy-tropical-spastic-paraparesis-the-first-case-report-in-southeast-asia
#11
Sekh Thanprasertsuk, Suwapan Pleumkanitkul, Supaporn Wacharapluesadee, Teerada Ponpinit, Thiravat Hemachudha, Chusana Suankratay
Human T-lymphotropic virus type-1 (HTLV-1) infection was diagnosed in a Thai patient with chronic progressive myelopathy. The phylogenetic tree of the ltr sequencing of HTLV-1 indicated the virus belongs to the Transcontinental genotype of the Cosmopolitan subtype A. This is the first case report of HTLV-1-associated myelopathy in South East Asia. Awareness of HTLV-1 and related condition should be encouraged in this region and routine screening should be applied in blood donor.
March 26, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28293169/brain-metabolism-changes-in-patients-infected-with-htlv-1
#12
Manuel Schütze, Luiz C F Romanelli, Daniela V Rosa, Anna B F Carneiro-Proietti, Rodrigo Nicolato, Marco A Romano-Silva, Michael Brammer, Débora M de Miranda
The Human T-cell leukemia virus type-I (HTLV-1) is the causal agent of HTLV-associated myelopathy/Tropical Spastic Paraparesis (HAM/TSP). HAM/TSP is the result of demyelination and cell death in the spinal cord and disruption of the blood-brain barrier (BBB), mediated by a virus-induced inflammatory response. In this study, we applied Positron Emission Tomography with 18F-fluordeoxyglucose (18F-FDG PET) to evaluate brain metabolism in a group of 47 patients infected with HTLV-1, and 18 healthy controls. Patients were divided into three groups according to their neurological symptoms...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28283598/leptomeningeal-gadolinium-enhancement-across-the-spectrum-of-chronic-neuroinflammatory-diseases
#13
Martina Absinta, Irene C M Cortese, Luisa Vuolo, Govind Nair, Manori P de Alwis, Joan Ohayon, Alessandro Meani, Vittorio Martinelli, Roberta Scotti, Andrea Falini, Bryan R Smith, Avindra Nath, Steven Jacobson, Massimo Filippi, Daniel S Reich
OBJECTIVE: To assess the prevalence and the specificity of leptomeningeal enhancement (LME) on postcontrast T2-fluid-attenuated inversion recovery (FLAIR) MRI in multiple sclerosis (MS) compared to a variety of inflammatory and noninflammatory neurologic conditions assessed in 2 academic research hospitals. METHODS: On 3T postcontrast T2-FLAIR images, the presence of focal gadolinium enhancement was evaluated in the leptomeningeal compartment in 254 people with non-MS neurologic conditions or neurotropic viral infections...
April 11, 2017: Neurology
https://www.readbyqxmd.com/read/28282508/cardiovascular-risk-profile-in-patients-with-myelopathy-associated-with-htlv-1
#14
Fabio Luís Silva do Prado, Renata Prado de Fuccio Oliveira, Ana Marice Teixeira Ladeia
HAM/TSP (HTLV-1-associated myelopathy/tropical spastic paraparesis) is a slowly progressive disease, characterized by a chronic spastic paraparesis. It is not known if the disease carries an independent risk for cardiovascular disease. The objective of this study was to evaluate the cardiovascular risk profile related to HAM/TSP and compare it with the general population. METHODS: This was a cross-sectional study, with a control group. HAM/TSP patients were evaluated using cardiovascular risk scores (ASCVD RISK, SCORE and Framingham) and inflammatory markers (ultrasensitive CRP and IL-6), and compared with a control group of healthy individuals...
March 7, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28263674/human-t-cell-leukemia-virus-type-1-and-eye-diseases
#15
Yukiko Terada, Koju Kamoi, Takashi Komizo, Kazunori Miyata, Manabu Mochizuki
Human T cell leukemia virus type 1, also known as human T lymphotropic virus type 1 (HTLV-1), is a retrovirus that encodes a reverse transcriptase, which translates viral RNA into a DNA provirus that is integrated into the host genome. The virus was found to be a causative agent of adult T cell leukemia/lymphoma (ATL) in the early 1980s, and was also found to cause the neurological disorder tropical spastic paraparesis (TSP)/HTLV-1-associated myelopathy (HAM) and the inflammatory disorder HTLV-1 uveitis in the mid 1980s and early 1990s, respectively...
May 2017: Journal of Ocular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28261958/rate-of-positive-autoimmune-markers-in-human-t-lymphotropic-virus-type-1-carriers-a-case-control-study-from-iran
#16
Sanaz Ahmadi Ghezeldasht, Mohammad Reza Hedayati-Moghaddam, Meysam Habibi, Farzad Mollahosseini, Houshang Rafatpanah, Rahele Miri, MohammadReza Hatef Fard, Maryam Sahebari
AIM: Human T lymphotropic virus type 1 (HTLV-1) infection with high prevalence in the north-east of Iran, particularly in Mashhad, can lead to adult T-cell leukemia (ATL) and HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) and a variety of autoimmune diseases. The aim of the study was to examine the presence of autoimmune markers in HTLV carries. METHODS: Serum samples were obtained from blood donors in Mashhad, northeastern Iran. One hundred and five HTLV-1 positive (cases) and 104 age- and sex-matched HTLV-1 negative donors (controls) were assessed for presence of serum autoimmune markers by enzyme-linked immunosorbent assay...
March 5, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28261198/a-fas-hi-lymphoproliferative-phenotype-reveals-non-apoptotic-fas-signaling-in-htlv-1-associated-neuroinflammation
#17
Soraya Maria Menezes, Fabio E Leal, Tim Dierckx, Ricardo Khouri, Daniele Decanine, Gilvaneia Silva-Santos, Saul V Schnitman, Ramon Kruschewsky, Giovanni López, Carolina Alvarez, Michael Talledo, Eduardo Gotuzzo, Douglas F Nixon, Jurgen Vercauteren, David Brassat, Roland Liblau, Anne Mieke Vandamme, Bernardo Galvão-Castro, Johan Van Weyenbergh
Human T-cell lymphotropic virus (HTLV)-1 was the first human retrovirus to be associated to cancer, namely adult T-cell leukemia (ATL), but its pathogenesis remains enigmatic, since only a minority of infected individuals develops either ATL or the neuroinflammatory disorder HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). A functional FAS -670 polymorphism in an interferon (IFN)-regulated STAT1-binding site has been associated to both ATL and HAM/TSP susceptibility. Fas(hi) T stem cell memory (Tscm) cells have been identified as the hierarchical apex of ATL, but have not been investigated in HAM/TSP...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28212879/flow-cytometric-based-protocols-for-assessing-anti-mt-2-igg1-reactivity-high-dimensional-data-handling-to-define-predictors-for-clinical-follow-up-of-human-t-cell-leukemia-virus-type-1-infection
#18
Jordana Grazziela Coelho-Dos-Reis, Vanessa Peruhype-Magalhães, Marcelo Antônio Pascoal-Xavier, Matheus de Souza Gomes, Laurence Rodrigues do Amaral, Ludmila Melo Cardoso, Juan Jonathan-Gonçalves, Ágata Lopes Ribeiro, Ana Lúcia Borges Starling, João Gabriel Ribas, Denise Utsch Gonçalves, Anna Bárbara de Freitas Carneiro-Proietti, Andréa Teixeira-Carvalho, Olindo Assis Martins-Filho
The present work provides an innovative methodological approach to assess the anti-HTLV-1 IgG1 reactivity with practical application in clinical laboratory. Serum from non-infected healthy controls (NI) and HTLV-1-infected patients, categorized as asymptomatic (AS), putatively progressing to HTLV-1 associated myelopathy/tropical spastic paraparesis - HAM/TSP (pHAM) or with clinical diagnosis of HAM/TSP (HT) were assayed in two-parallel flow cytometry platforms, referred as: Fix and Fix&Perm protocols. Operating-characteristics analysis indicated that a single pair of attributes ("serum dilution/cut-off") for Fix and Fix&Perm protocols presented excellent performance for the diagnosis of HTLV-1 infection...
February 16, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28206670/altered-expression-of-cxcr3-and-ccr6-and-their-ligands-in-htlv-1-carriers-and-ham-tsp-patients
#19
Houshang Rafatpanah, Mehdi Felegari, Mahmoud Reza Azarpazhooh, Rosita Vakili, Taraneh Rajaei, Ian Hampson, Golmahossein Hassanshahi, Narges Valizadeh, Sina Gerayli, Farajifard Hamid, Shadi Zamanian, Farzad MollaHosseini, Seyed Abdolrahim Rezaee
Recruitment of leukocytes by chemokines and chemokine receptors to CNS plays a crucial role in the induction of inflammatory response in HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). In the present study, chemokine and chemokine receptors involved in trafficking of lymphocytes to the CNS were measured in HAM/TSP patients, HTLV-1 asymptomatic carriers (ACs), and healthy controls. The PVL, CCR6, and CXCR3 mRNA expression, and CXCL9 and CXCL10 protein levels were measured in all subjects...
February 16, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28202003/prevalence-and-risk-factors-for-human-t-lymphotropic-virus-type-1-htlv-1-among-maintenance-hemodialysis-patients
#20
Rilma F S Santos, Gildásio C Conceição, Márcia S Martins, Angiolina Kraychete, Maria A C Penalva, Edgar M Carvalho, Antonio Alberto Lopes, Paulo Novis Rocha
BACKGROUND: Infection with the human T-cell lymphotropic virus type 1 (HTLV-1), although asymptomatic in most cases, can lead to potentially grave consequences, such as adult T-cell leukemia-lymphoma and HTLV-1-associated myelopathy / tropical spastic paraparesis. Its prevalence varies widely across different populations and geographic regions. A population-based study in the city of Salvador, located in the Northeast region of Brazil, showed an overall prevalence of HTLV-1 seropositivity of 1...
February 15, 2017: BMC Nephrology
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