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HTLV-1

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https://www.readbyqxmd.com/read/28771137/the-duffy-null-genotype-is-associated-with-a-lower-level-of-ccl2-leukocytes-and-neutrophil-count-but-not-with-the-clinical-outcome-of-htlv-1-infection
#1
Maria Clara Fernandes da Silva-Malta, Camila Campos Sales, Jacqueline Cronemberger Guimarães, Poliane de Cássia Gonçalves, Daniel Gonçalves Chaves, Hadassa Campos Santos, Alexandre da Costa Pereira, João Gabriel Ribas, Anna Bárbara de Freitas Carneiro-Proietti, Marina Lobato Martins
PURPOSE: Chemokines are important in the immune response against viral infections, and may play a role in human T-lymphotropic virus 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) pathogenesis. Polymorphisms in the Duffy antigen receptor for chemokines (DARC), such as rs12075 (A>G; FY*B>FY*A) and rs281477 (-46T>C; GATA-1 box) may influence circulating concentrations of proinflammatory chemokines. We investigate whether Duffy genotypes influence the HTLV-1 proviral load (PVL) level, HTLV-1 infection outcome and chemokine concentrations in HTLV-1 asymptomatic carriers (AC=162), HAM/TSP patients (HAM=135) and seronegative individuals (SN=71)...
August 4, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28768861/positive-and-negative-regulation-of-type-i-interferons-by-the-human-t-cell-leukemia-virus-antisense-protein-hbz
#2
Manraj Singh Narulla, Ahlam Alsairi, Lucie Charmier, Stephen Noonan, David Conroy, William W Hall, Noreen Sheehy
The pathogenesis of human T-cell leukemia virus type 1 (HTLV-1) is strongly linked to the viral regulatory proteins Tax1 and HBZ, whose opposing functions contribute to the clinical outcome of infection. Type I interferons α and β (IFNα and IFNβ) are key cytokines involved in innate immunity and IFNα, in combination with other antivirals, is extensively used in the treatment of HTLV-1 infection. The relationship between HTLV-1 and IFN signaling is unclear and to date the effect of HBZ on this pathway has not been examined...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28755019/turning-a-blind-eye-htlv-1-associated-uveitis-in-indigenous-adults-from-central-australia
#3
Rusheng Chew, Timothy Henderson, Jaskirat Aujla, Eline Whist, Lloyd Einsiedel
PURPOSE: We describe the first two cases of HTLV-1 associated uveitis to be associated with HTLV-1c subtype infection. METHODS: Case report. RESULTS: Uveitis was demonstrated in two Indigenous Australian men, both of whom had high HTLV-1c proviral loads in peripheral blood. Visual outcomes were poor in each case. CONCLUSION: Clinicians should be aware of HTLV-1c infection as a cause of uveitis in Australia, and HTLV-1 serology should be included in the basic uveitis work-up in HTLV-1-endemic areas...
July 28, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28753950/perturbation-of-human-t-cell-leukemia-virus-type-1-particle-morphology-by-differential-gag-co-packaging
#4
José O Maldonado, Isaac Angert, Sheng Cao, Serkan Berk, Wei Zhang, Joachim D Mueller, Louis M Mansky
Human T-cell leukemia virus type 1 (HTLV-1) is an important cancer-causing human retrovirus that has infected approximately 15 million individuals worldwide. Many aspects of HTLV-1 replication, including virus particle structure and assembly, are poorly understood. Group-specific antigen (Gag) proteins labeled at the carboxy terminus with a fluorophore protein have been used extensively as a surrogate for fluorescence studies of retroviral assembly. How these tags affect Gag stoichiometry and particle morphology has not been reported in detail...
July 19, 2017: Viruses
https://www.readbyqxmd.com/read/28745235/effects-of-ascorbic-acid-on-tax-nf-%C3%AE%C2%BAb-and-mmp-9-in-human-t-cell-lymphotropic-virus-type-1-positive-malignant-t-lymphocytes
#5
Steve Harakeh, Jihane Khalife, Elias Baydoun, Rania Azar, Ahmed Al-Hejin, Elie Barbour, Esam Azhar, Aleksandra Niedzwiecki, Soad Al Jaouni, Mona Diab-Assaf, Mohammad Amjad Kamal, Mathias Rath
BACKGROUND: HTLV-1 is a retrovirus that infects CD4-positive cells and leads to Adult T-cell leukemia by constitutive activation of nuclear factor kappa B. Ascorbic acid (AA) is an essential nutrient that possess anti-proliferative and pro-apoptotic activity against a number of malignant cell lines. This study delineates the effect of AA on Tax protein expression as well as NF-κB and MMP9 activity in two HTLV-1-positive leukemia cells (HuT-102 and C91-PL). METHODS: The cytotoxic and antiproliferative effect of AA were studied by LDH release and MTT tests respectively...
July 25, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28742148/hijacking-of-the-o-glcnaczyme-complex-by-the-htlv-1-tax-oncoprotein-facilitates-viral-transcription
#6
Damien Groussaud, Mostafa Khair, Armelle I Tollenaere, Laetitia Waast, Mei-Shiue Kuo, Marianne Mangeney, Christophe Martella, Yann Fardini, Solène Coste, Mouloud Souidi, Laurence Benit, Claudine Pique, Tarik Issad
The viral Tax oncoprotein plays a key role in both Human T-cell lymphotropic virus type 1 (HTLV-1)-replication and HTLV-1-associated pathologies, notably adult T-cell leukemia. Tax governs the transcription from the viral 5'LTR, enhancing thereby its own expression, via the recruitment of dimers of phosphorylated CREB to cAMP-response elements located within the U3 region (vCRE). In addition to phosphorylation, CREB is also the target of O-GlcNAcylation, another reversible post-translational modification involved in a wide range of diseases, including cancers...
July 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28734235/characterization-of-cognitive-performance-and-evaluation-of-quality-of-life-among-patients-with-htlv-1
#7
Liliana Raulino Goncalves, Leopoldo Nelson Fernandes Barbosa, Paula Machado Ribeiro Magalhaes, Pedro Augusto Sampaio Rocha-Filho
OBJECTIVE: To characterize cognitive alterations among patients with HTLV-1, ascertain what is associated with these alterations and evaluate these patients' quality of life. PATIENTS AND METHODS: This was a cross-sectional study. Patients infected by HTLV-1 who were seen at the Oswaldo Cruz University Hospital from March 2014 to June 2015 were included in the study. A semi-structured questionnaire and the Mini-Mental State Examination, Color Trails Test, Wechsler Adult Intelligence Scale (WAIS-III), Hospital Anxiety and Depression Scale and Medical Outcomes Study 36-Item Short-Form Health Survey (SF36) were used...
September 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28731999/-duodenal-linphoma-asociated-to-strongyloides-stercoralis-infection-two-types-of-htlv-1-infection
#8
Julissa Guevara Miranda, Patricia Guzmán Rojas, Jorge Espinoza-Ríos, Fernando Mejía Cordero
Infection by the Human T- Lymphotropic virus I (HTLV-1) causes Adult T cell Leukemia-lymphoma (ATLL), being the duodenal involvement rare. Commonly, patients co-infected with HTLV-1 and Strongyloides stercoralis are seen due to the lack of TH2 response found on these patients. We describe a 48-year- old woman, from the jungle of Peru, with a family history of HTLV-1 infection, who presented with a History of chronic diarrhea and weight loss. HTLV-1 infection with ATLL and strongyloidiasis were diagnosed. Ivermectin treatment and chemotherapy were initiated, being stabilized, and discharged...
April 2017: Revista de Gastroenterología del Perú: órgano Oficial de la Sociedad de Gastroenterología del Perú
https://www.readbyqxmd.com/read/28724766/a-unique-t-cell-receptor-amino-acid-sequence-selected-by-htlv-i-tax301-309-specific-cytotoxic-t-cells-in-hla-a24-02-asymptomatic-carriers-and-adult-t-cell-leukemia-lymphoma-patients
#9
Yuko Ishihara, Yukie Tanaka, Seiichiro Kobayashi, Koji Kawamura, Hideki Nakasone, Ayumi Gomyo, Jin Hayakawa, Masaharu Tamaki, Yu Akahoshi, Naonori Harada, Machiko Kusuda, Kazuaki Kameda, Tomotaka Ugai, Hidenori Wada, Kana Sakamoto, Miki Sato, Kiriko Terasako-Saito, Misato Kikuchi, Shun-Ichi Kimura, Aki Tanihara, Shinichi Kako, Kaoru Uchimaru, Yoshinobu Kanda
We previously reported that the T-cell receptor (TCR) repertoire of HTLV-I Tax301-309-specific CD8(+) cytotoxic T-cells (Tax-CTLs) was highly restricted and a particular amino acid sequence motif, "PDR", was conserved among HLA-A*24:02(+) ATL patients who have undergone allogeneic hematopoietic cell transplantation (allo-HSCT). Furthermore, we found that donor-derived PDR+CTLs selectively expanded in ATL long-term HSCT survivors with strong CTL activity against HTLV-I. On the other hand, the TCR repertoires in Tax-CTL of asymptomatic HTLV-I carriers (ACs) remain unclear...
July 19, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28716148/prevalence-of-plasma-autoantibody-against-cancer-testis-antigen-ny-eso-1-in-htlv-1-infected-individuals-with-different-clinical-status
#10
Yasuo Shiohama, Tadasuke Naito, Toshio Matsuzaki, Reiko Tanaka, Takeaki Tomoyose, Hiroshi Takashima, Takuya Fukushima, Yuetsu Tanaka, Mineki Saito
BACKGROUND: Detection of specific immune responses against cancer/testis antigen NY-ESO-1 was recently reported in patients with adult T-cell leukemia/lymphoma (ATL) and human T-cell leukemia virus type 1 (HTLV-1)-infected asymptomatic carriers (ACs). However, the relationship of the responses with the HTLV-1 proviral load (PVL) and the levels of viral gene expression remain unclear. FINDINGS: We measured plasma levels of autoantibodies to NY-ESO-1 immunogenic tumor antigen in HTLV-1-infected individuals with different clinical status, and in healthy controls...
July 17, 2017: Virology Journal
https://www.readbyqxmd.com/read/28701419/proviral-features-of-human-t-cell-leukemia-virus-type-1-in-carriers-with-indeterminate-western-blot-results
#11
Madoka Kuramitsu, Tsuyoshi Sekizuka, Tadanori Yamochi, Sanaz Firouzi, Tomoo Sato, Kazumi Umeki, Daisuke Sasaki, Hiroo Hasegawa, Ryuji Kubota, Rieko Sobata, Chieko Matsumoto, Noriaki Kaneko, Haruka Momose, Kumiko Araki, Masumichi Saito, Kisato Nosaka, Atae Utsunomiya, Ki-Ryang Koh, Masao Ogata, Kaoru Uchimaru, Masako Iwanaga, Yasuko Sagara, Yoshihisa Yamano, Akihiko Okayama, Kiyonori Miura, Masahiro Satake, Shigeru Saito, Kazuo Itabashi, Kazunari Yamaguchi, Makoto Kuroda, Toshiki Watanabe, Kazu Okuma, Isao Hamaguchi
Western blot (WB) for human T cell leukemia virus type 1 is performed to confirm anti-HTLV-1 antibodies detected at the initial screening of blood donors and in pregnant women. However, the frequent occurrence of indeterminate results is a problem with this test. We therefore assessed the cause of WB-indeterminate results by analyzing the genomic sequences of HTLV-1 provirus. Quantitative PCR measuring HTLV-1 provirus in WB-indeterminate samples revealed that the median proviral load was approximately 100-fold lower than that of WB-positive samples (0...
July 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28700737/correction-dendritic-cell-maturation-but-not-type-i-interferon-exposure-restricts-infection-by-htlv-1-and-viral-transmission-to-t-cells
#12
Gergès Rizkallah, Sandrine Alais, Nicolas Futsch, Yuetsu Tanaka, Chloé Journo, Renaud Mahieux, Hélène Dutartre
[This corrects the article DOI: 10.1371/journal.ppat.1006353.].
July 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28700391/human-t-lymphotropic-virus-type-1-infection-and-disease-in-spain
#13
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 men to women) and parenterally (transfusions, injection drug user (IDU), and transplants)...
July 31, 2017: AIDS
https://www.readbyqxmd.com/read/28698846/evaluation-of-the-role-of-tax-hbz-and-htlv-1-proviral-load-on-the-survival-of-atll-patients
#14
Mohammad Mehdi Akbarin, Abbas Shirdel, Alireza Bari, Seyedeh Tahereh Mohaddes, Houshang Rafatpanah, Ehsan Ghayour Karimani, Kobra Etminani, Amin Golabpour, Reza Torshizi
BACKGROUND: Adult T-cell leukemia/lymphoma (ATLL) is an aggressive malignancy with very poor prognosis and short survival, caused by the human T-lymphotropic virus type-1 (HTLV-1). The HTLV-1 biomarkers trans-activator x (TAX) and HTLV-1 basic leucine zipper factor (HBZ) are main oncogenes and life-threatening elements. This study aimed to assess the role of the TAX and HBZ genes and HTLV-1 proviral load (PVL) in the survival of patients with ATLL. METHODS: Forty-three HTLV-1-infected individuals, including 18 asymptomatic carriers (AC) and 25 ATLL patients (ATLL), were evaluated between 2011 and 2015...
June 2017: Blood Research
https://www.readbyqxmd.com/read/28697807/inferring-clonal-structure-in-htlv-1-infected-individuals-towards-bridging-the-gap-between-analysis-and-visualization
#15
Amir Farmanbar, Sanaz Firouzi, Wojciech Makałowski, Masako Iwanaga, Kaoru Uchimaru, Atae Utsunomiya, Toshiki Watanabe, Kenta Nakai
BACKGROUND: Human T cell leukemia virus type 1 (HTLV-1) causes adult T cell leukemia (ATL) in a proportion of infected individuals after a long latency period. Development of ATL is a multistep clonal process that can be investigated by monitoring the clonal expansion of HTLV-1-infected cells by isolation of provirus integration sites. The clonal composition (size, number, and combinations of clones) during the latency period in a given infected individual has not been clearly elucidated...
July 11, 2017: Human Genomics
https://www.readbyqxmd.com/read/28689168/systemic-diseases-in-patients-with-htlv-1-associated-uveitis
#16
Kumiko Nakao, Noriko Abematsu, Taiji Sakamoto
BACKGROUND: Human T-lymphotropic virus type 1 (HTLV-1) carriers may develop severe systemic diseases, such as adult T cell leukaemia (ATL) or HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). This study aims to investigate systemic diseases of HTLV-1 carriers who had developed HTLV-1-associated uveitis (HAU). METHODS: We investigated the occurrence of systemic diseases in 200 patients with HAU by performing a retrospective investigation of their medical records and examining the results of a postal survey...
July 8, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28680001/progress-in-the-management-of-atl
#17
Kenji Ishitsuka
Adult T-cell leukemia/lymphoma (ATL) is a peripheral T-cell malignancy caused by human T-lymphotropic virus type I (HTLV-1), and its prognosis remains poor. Three to five percent of HTLV-1 carriers, infected mainly by breast feeding, develop ATL after a latency period as long as 70 years. The standard of care for aggressive ATL and indolent ATL comprises intensive chemotherapy followed by allogeneic hematopoietic stem cell transplantation, if applicable, and watchful waiting, respectively. Outside Japan, a combination of interferon-α and zidovudine has also been used as a therapeutic option for acute, chronic, and smoldering-type ATLs...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/28669733/bcl11b-is-frequently-downregulated-in-htlv-1-infected-t-cells-through-tax-mediated-proteasomal-degradation
#18
Happy Kurnia Permatasari, Shingo Nakahata, Tomonaga Ichikawa, Kazuhiro Morishita
Human T-cell leukemia virus type 1 (HTLV-1) is a causative agent of adult T-cell leukemia-lymphoma (ATLL). The HTLV-1-encoded protein Tax plays important roles in the proliferation of HTLV-1-infected T-cells by affecting cellular proteins. In this study, we showed that Tax transcriptionally and post-transcriptionally downregulates the expression of the tumor suppressor gene B-cell leukemia/lymphoma 11B (BCL11B), which encodes a lymphoid-related transcription factor. BCL11B expression was downregulated in HTLV-1-infected T-cell lines at the mRNA and protein levels, and forced expression of BCL11B suppressed the proliferation of these cells...
August 26, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28666508/disseminated-kaposi-s-sarcoma-in-an-immunosuppressed-patient-after-long-term-inhaled-and-systemic-steroid-therapy
#19
Shiyam Kumar, Ikram A Burney, P A M Saparamadu, Chandu de Silva
Kaposi's sarcoma is associated with immunosuppressant treatment administered to patients with organ transplant and other immune related disorders. Several case reports have reported association of Kaposi's sarcoma and steroids. Almost all patients in those case reports had localised disease to skin and they responded to tapering doses or discontinuation of steroids. Here we present a case of an elderly asthmatic man who was using self-medication with systemic and inhaled steroids for about two decades. He presented with widespread skin lesions and anemia...
November 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28656665/testing-for-htlv-1-and-htlv-2-among-blood-donors-in-western-saudi-arabia-prevalence-and-cost-considerations
#20
S Hindawi, M Badawi, F Fouda, B Mallah, B Mallah, H Rajab, T Madani
BACKGROUND: Screening all blood donors for human T-cell lymphotropic viruses 1 and 2 (HTLV 1 and HTLV 2) is mandatory in Saudi Arabia. The aim of this study is to evaluate the results and costs associated with the current testing policy for HTLV 1 and HTLV 2 in blood donors at King Abdulaziz University Hospital (KAUH), Jeddah. STUDY DESIGNS AND METHODS: Donor-testing results from Blood Transfusion Services at KAUH were reviewed over a 10-year period, from January 2006 through December 2015...
June 28, 2017: Transfusion Medicine
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