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HTLV Myelopathy

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https://www.readbyqxmd.com/read/28615198/polymorphic-nature-of-htlv-1-particle-cores-as-revealed-through-characterization-of-a-chronically-infected-cell-line
#1
Morgan E Meissner, Luiza Mendonça, Wei Zhang, Louis M Mansky
Human T-cell leukemia virus type 1 (HTLV-1) is the etiological agent of adult T-cell leukemia (ATL) and HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). HTLV-1 cell-to-cell transmission is dependent on the release of infectious virus particles into the virological synapse. HTLV-1 particle structure is still poorly understood, and previous studies have analyzed viruses produced by transformed lymphocytic cell lines chronically infected with HTLV-1, particularly the MT-2 cell line, which harbors truncated proviruses and expresses aberrant forms of the Gag protein...
June 14, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28608127/downregulation-of-histone-methyltransferase-ehmt2-in-cd4-t-cells-may-protect-htlv-1-infected-individuals-against-ham-tsp-development
#2
Camila Schoueri Colaço, Adriano Reis de Matos, Martha Silva Estrêla, Maurício Cristiano Rocha-Júnior, Kátia Kaori Otaguiri, Evandra Strazza Rodrigues, Osvaldo Massaiti Takayanagui, Dimas Tadeu Covas, Simone Kashima, Fabio Pittella Silva, Rodrigo Haddad
Approximately 5% of human T-cell leukemia virus type 1 (HTLV-1)-infected individuals will develop one of the HTLV-1-related diseases, such as HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) or adult T-cell leukemia. However, the mechanisms responsible for the appearance of symptoms have not been fully clarified. It is believed that viral factors, host genetic and epigenetic mechanisms are implicated in this process. Studies have shown the involvement of histone methyltransferases in retrovirus infection, but no study observed their expression in HTLV-1-infected patients...
June 12, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28596939/undifferentiated-pleomorphic-sarcoma-and-the-importance-of-considering-the-oncogenic-and-immune-suppressant-role-of-the-human-t-cell-lymphotropic-virus-type-1-a-case-report
#3
Sergio Lupo, Carolina Berini, Camila Cánepa, Eduardo Santini Araujo, Mirna Biglione
INTRODUCTION: Soft-tissue sarcomas account for 0.7% of all malignant tumors, with an incidence rate of 3 per 100,000 persons/year. The undifferentiated pleomorphic sarcoma (UPS) with giant cells, a high grade tumor of soft tissue, is very unusual, especially in young adults before the age of 40. Human T-cell lymphotropic virus type 1 (HTLV-1) is a human retrovirus, classified as group 1 human carcinogens by The International Agency for Research on Cancer, that causes an aggressive malignancy known as adult T-cell lymphoma/leukemia and a progressive chronic inflammatory neurological disease named HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP)...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28582585/early-onset-of-htlv-1-associated-myelopathy-tropical-spastic-paraparesis-ham-tsp-and-adult-t-cell-leukemia-lymphoma-atl-systematic-search-and-review
#4
Pedro D Oliveira, Amanda C Kachimarek, Achiléa L Bittencourt
Human T-cell lymphotropic virus type 1 (HTLV-1) is endemic in some regions and its vertical transmission occurs mainly through breastfeeding. About 10% of carriers develop associated diseases including HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP), adult T-cell leukemia/lymphoma (ATL) and infectious dermatitis associated with HTLV-1 (IDH). We searched for available case reports of early-onset HAM/TSP and ATL to evaluate demographic and disease aspects in infantile-juvenile patients. In the reviewed literature, 27 HAM/TSP and 31 ATL cases were found...
June 5, 2017: Journal of Tropical Pediatrics
https://www.readbyqxmd.com/read/28540757/association-of-tuberculosis-status-with-neurologic-disease-and-immune-response-in-htlv-1-infection
#5
Anselmo Souza, Natália Carvalho, Yuri Neves, Silvane Braga Santos, Maria de Lourdes Bastos, Sergio Arruda, Eduardo Martins Netto, Marshall Glesby, Edgar Carvalho
The human T-cell lymphotropic virus type 1 (HTLV-1) is the etiologic agent of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). HTLV-1 infected individuals have increased susceptibility to Mycobacterium tuberculosis infection but the influence of tuberculosis on the course of HTLV-1 infection is unknown. The aim of this study was to evaluate the influence of tuberculosis on immunological, virologic, and neurologic features of HTLV-1 infection. This is a retrospective analysis of individuals enrolled in a cohort study from an HTLV-1 clinic who were evaluated for past or latent tuberculosis and classified clinically as HTLV-1 carriers, probable HAM/TSP and definite HAM/TSP...
May 25, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28536850/effectiveness-of-daily-prednisolone-to-slow-progression-of-human-t-lymphotropic-virus-type-1-associated-myelopathy-tropical-spastic-paraparesis-a-multicenter-retrospective-cohort-study
#6
Ariella L G Coler-Reilly, Tomoo Sato, Toshio Matsuzaki, Masanori Nakagawa, Masaaki Niino, Masahiro Nagai, Tatsufumi Nakamura, Norihiro Takenouchi, Natsumi Araya, Naoko Yagishita, Eisuke Inoue, Yoshihisa Yamano
Millions of people are infected with human T-lymphotropic virus type 1 (HTLV-1) worldwide; notable endemic areas include Brazil, the Caribbean islands, Iran, and Japan. A small number of those infected develop the progressive neurodegenerative disease HTLV-1-associated myelopathy (HAM), also known as tropical spastic paraparesis (TSP), which is characterized by chronic spinal cord inflammation and accompanying myelopathic symptoms. The corticosteroid prednisolone (PSL) is a classic treatment for HAM/TSP, yet its effectiveness remains controversial owing to insufficient and conflicting studies...
May 23, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28484158/adult-t-cell-leukemia-lymphoma-complicated-by-takotsubo-cardiomyopathy-and-htlv-1-associated-myelopathy-after-treatment-with-the-anti-ccr4-antibody-mogamulizumab
#7
Satoshi Yamanaka, Kazutaka Nakayama, Hayato Tamai, Masanori Sakamaki, Koiti Inokuchi
Adult T-cell leukemia-lymphoma (ATL) caused by human T-lymphotropic virus type 1 (HTLV-1) is generally associated with poor prognosis. The anti-CCR4 antibody mogamulizumab is one of the options for refractory or relapsed ATL. Mogamulizumab is intravenously administered as a single agent at a dose of 1.0 mg/kg once a week for 8 weeks. The overall response rate is reported to be 50%. Reported common adverse events after administration of mogamulizumab are leukocytopenia, infusion reaction, and skin rash. Although rare, mogamulizumab-associated cardiomyopathy has also been reported...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/28463883/htlv-1-infection-and-disease-in-spain
#8
Carmen de Mendoza, Estrella Caballero, Antonio Aguilera, Silvia Requena, Raúl Ortiz de Lejarazu, María Pirón, Rocío González, Ana Jiménez, Lourdes Roc, Ana Treviño, Rafael Benito, Miriam Fernández-Alonso, Aitziber Aguinaga, Carmen Rodríguez, Juan García-Costa, Lidia Blanco, José M Ramos, Enrique Calderón, José M Eirós, Silvia Sauleda, Pablo Barreiro, Vicente Soriano
: Human T-lymphotropic virus type 1 (HTLV-1) infection is a neglected disease despite roughly 15 million people are chronically infected worldwide. Lifelong less than 10% of carriers develop life-threatening diseases, mostly a subacute myelopathy known as tropical spastic paraparesis (TSP) and a lymphoproliferative disorder named adult T-cell leukemia (ATL). HTLV-1 is efficiently transmitted perinatally (breastfeeding), sexually (more from male to female) and parenterally (transfusions, injection drug use and transplants)...
May 1, 2017: AIDS
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
#9
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 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
#10
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
#11
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...
May 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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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