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Human herpesvirus 6

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https://www.readbyqxmd.com/read/28737715/latency-integration-and-reactivation-of-human-herpesvirus-6
#1
REVIEW
Shara N Pantry, Peter G Medveczky
Human herpesvirus-6A (HHV-6A) and human herpesvirus-6B (HHV-6B) are two closely related viruses that infect T-cells. Both HHV-6A and HHV-6B possess telomere-like repeats at the terminal regions of their genomes that facilitate latency by integration into the host telomeres, rather than by episome formation. In about 1% of the human population, human herpes virus-6 (HHV-6) integration into germline cells allows the viral genome to be passed down from one generation to the other; this condition is called inherited chromosomally integrated HHV-6 (iciHHV-6)...
July 24, 2017: Viruses
https://www.readbyqxmd.com/read/28728872/oropharyngeal-lesions-in-pityriasis-rosea
#2
Giulia Ciccarese, Francesco Broccolo, Alfredo Rebora, Aurora Parodi, Francesco Drago
BACKGROUND: Pityriasis rosea (PR) is an exanthematous disease associated with the endogenous systemic reactivation of human herpesvirus-6 (HHV-6) and human herpesvirus-7 (HHV-7). Oropharyngeal lesions may be associated with the exanthema, but anecdotal evidence suggests that few dermatologists are aware of their occurrence. OBJECTIVE: Classifying oropharyngeal lesions in PR, establishing their prevalence, and assessing their possible association with different PR forms...
July 17, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28723708/subclinical-herpesvirus-shedding-among-hiv-1-infected-men-on-antiretroviral-therapy
#3
Arcadio Agudelo-Hernandez, Yue Chen, Arlene Bullotta, William G Buchanan, Cynthia R Klamar-Blain, Luann Borowski, Sharon A Riddler, Charles R Rinaldo, Bernard Jc Macatangay
DESIGN: We evaluated the subclinical shedding of 6 different herpesviruses in antiretroviral drug-treated HIV(+) men who have sex with men (MSM), and determined how this is associated with markers of inflammation and immune activation. METHODS: We obtained blood, semen, throat washing, urine, and stool from 15 antiretroviral-treated HIV-1-infected MSM with CD4 T cell reconstitution, and 12 age-matched HIV(-) MSM from the Multicenter AIDS Cohort Study at 4 timepoints over 24 weeks to measure DNA levels of cytomegalovirus (CMV), Epstein-Barr virus (EBV), herpes simplex virus 1 and 2, human herpesvirus 6 (HHV6), and HHV8...
July 18, 2017: AIDS
https://www.readbyqxmd.com/read/28704957/chromosomally-integrated-human-herpesvirus-6-models-of-viral-genome-release-from-the-telomere-and-impacts-on-human-health
#4
REVIEW
Michael L Wood, Nicola J Royle
Human herpesvirus 6A and 6B, alongside some other herpesviruses, have the striking capacity to integrate into telomeres, the terminal repeated regions of chromosomes. The chromosomally integrated forms, ciHHV-6A and ciHHV-6B, are proposed to be a state of latency and it has been shown that they can both be inherited if integration occurs in the germ line. The first step in full viral reactivation must be the release of the integrated viral genome from the telomere and here we propose various models of this release involving transcription of the viral genome, replication fork collapse, and t-circle mediated release...
July 12, 2017: Viruses
https://www.readbyqxmd.com/read/28704770/detection-of-oncogenic-viruses-in-water-environments-by-a-luminex-based-multiplex-platform-for-high-throughput-screening-of-infectious-agents
#5
P Di Bonito, M Iaconelli, T Gheit, M Tommasino, S Della Libera, L Bonadonna, G La Rosa
Recent studies documented the detection of viruses strongly associated with human cancer in urban sewages and other water environments worldwide. The aim of this study was to estimate the occurrence of human oncogenic viruses in environmental samples (sewage, river, marine, and pool/spa water) using highly sensitive and specific multiplex bead-based assays (Luminex technology). A total of 33 samples were analysed for 140 oncogenic viral agents, including mucosal and cutaneous human papillomaviruses (HPVs), human polyomaviruses (HPyV), human herpesviruses (HHV) and mouse mammary tumour virus (MMTV)...
July 5, 2017: Water Research
https://www.readbyqxmd.com/read/28699856/analysis-of-the-origin-of-inherited-chromosomally-integrated-human-herpesvirus-6-in-the-japanese-population
#6
Yoshiki Kawamura, Tamae Ohye, Hiroki Miura, Masaru Ihira, Yuri Kato, Hiroki Kurahashi, Tetsushi Yoshikawa
Integration of the complete human herpesvirus 6 (HHV-6) genome into the telomere of a chromosome has been reported in some individuals (inherited chromosomally integrated HHV-6; iciHHV-6). Since the proportion of iciHHV-6-positive individuals with integration in chromosome 22 is high in Japan, we hypothesized a founder effect. In this study, we sought to elucidate the reason for the high proportion of viral integrations into chromosome 22. We analyzed six cases of iciHHV-6A and two cases of iciHHV-6B, including one iciHHV-6A case with a matched sample from a father and one iciHHV-6B case with a matched sample from a mother...
July 12, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28672870/hhv-6a-b-integration-and-the-pathogenesis-associated-with-the-reactivation-of-chromosomally-integrated-hhv-6a-b
#7
REVIEW
Vanessa Collin, Louis Flamand
Unlike other human herpesviruses, human herpesvirus 6A and 6B (HHV-6A/B) infection can lead to integration of the viral genome in human chromosomes. When integration occurs in germinal cells, the integrated HHV-6A/B genome can be transmitted to 50% of descendants. Such individuals, carrying one copy of the HHV-6A/B genome in every cell, are referred to as having inherited chromosomally-integrated HHV-6A/B (iciHHV-6) and represent approximately 1% of the world's population. Interestingly, HHV-6A/B integrate their genomes in a specific region of the chromosomes known as telomeres...
June 26, 2017: Viruses
https://www.readbyqxmd.com/read/28668607/characterization-and-serotype-distribution-of-aggregatibacter-actinomycetemcomitans-relationship-of-serotypes-to-herpesvirus-and-periodontal-status-in-indian-subjects
#8
Vinayak M Joshi, Kishore G Bhat, Manohar S Kugaji, Ravi Shirahatti
BACKGROUND: The virulence of Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) in any individual depends on the type of strain of this bacterium. To our knowledge, there have been no studies reported in Indian subjects about A. actinomycetemcomitans serotype occurrence, co-existence with herpes virus and the possible influence of such co-existence on periodontal pathology. METHODS: Subjects for this study were a subset of a larger study to identify the prevalence of A...
June 28, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28668490/co-infections-by-double-stranded-dna-viruses-after-ex-vivo-t-cell-depleted-cd34-selected-hematopoietic-cell-transplantation
#9
Yao-Ting Huang, Seong Jin Kim, Yeon Joo Lee, Daniel Burack, Paige Nichols, Molly Maloy, Miguel-Angel Perales, Sergio A Giralt, Ann A Jakubowski, Genovefa A Papanicolaou
Recipients of ex vivo T cell-depleted (TCD) hematopoietic cell transplantation (HCT) are at risk of infection by double-stranded (ds) DNA viruses. We report rates of dsDNA viremia, end-organ disease (EOD), infection-related mortality, and overall survival (OS) in a contemporary cohort of adult TCD HCT recipients routinely monitored for cytomegalovirus (CMV), adenovirus (ADV), human herpesvirus 6 (HHV6), and Epstein-Barr virus (EBV). Healthcare utilization in the first 6 months post-HCT was compared between patients with dsDNA viremia versus no viremia...
June 28, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28650593/hhv-6-in-liver-transplantation-a-literature-review
#10
REVIEW
Tuan L Phan, Irmeli Lautenschlager, Raymund R Razonable, Flor M Munoz
Human herpesvirus 6 (HHV-6A and HHV-6B) can cause primary infection or reactivate from latency in liver transplant recipients, which can result in a variety of clinical syndromes, including fever, hepatitis, encephalitis, and higher rates of graft dysfunction as well as indirect effects including increased risks of mortality, CMV disease, hepatitis C progression and greater fibrosis scores. Although HHV-6 infection is currently diagnosed by quantifying viral DNA in plasma or blood, biopsy to demonstrate histopathologic effects of HHV-6 remains the gold standard for diagnosis of end-organ disease...
June 26, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28649271/effect-of-electrochemotherapy-on-human-herpesvirus-8-kinetics-in-classic-kaposi-sarcoma
#11
Noemy Starita, Gianluca Di Monta, Andrea Cerasuolo, Ugo Marone, Anna Maria Anniciello, Gerardo Botti, Luigi Buonaguro, Franco M Buonaguro, Maria Lina Tornesello
BACKGROUND: Electrochemotherapy (ECT) has shown to be an effective treatment for cutaneous and subcutaneous Kaposi sarcoma (KS) lesions. However, no study has investigated the impact of ECT treatment on the kinetics of human herpesvirus type 8 (HHV8), which is considered the necessary causal agent of KS. We aimed to evaluate HHV8 viral load and expression levels in patients affected by classic KS who received one or more ECT treatments and have been followed semi annually for up to four years...
2017: Infectious Agents and Cancer
https://www.readbyqxmd.com/read/28617304/human-herpesvirus-6-reactivation-in-dress-with-acute-liver-failure-a-missing-key-factor
#12
Vincent Descamps, Florence Brunet-Possenti
No abstract text is available yet for this article.
April 7, 2017: Transplantation
https://www.readbyqxmd.com/read/28601677/impact-of-stem-cell-graft-on-early-viral-infections-and-immune-reconstitution-after-allogeneic-transplantation-in-adults
#13
Marina Illiaquer, Berthe-Marie Imbert-Marcille, Thierry Guillaume, Lucie Planche, Marie Rimbert, Céline Bressollette-Bodin, Amandine Le Bourgeois, Pierre Peterlin, Alice Garnier, Claire Le Houerou, Philippe Moreau, Mohamad Mohty, Patrice Chevallier
BACKGROUND: Viral infections are well-known complications after allogeneic stem cell transplant (allo-SCT). OBJECTIVES: We compared prospectively incidences of DNAemia and active infections (AI) for five opportunistic viruses (Human Herpesvirus 6 (HHV-6), Epstein-Barr virus (EBV), BK polyomavirus (BKPyV), Cytomegalovirus (CMV) and Adenovirus (ADV)) and kinetics of immune reconstitution (IR) in adults receiving either double umbilical cord blood (dUCB group) or unrelated peripheral blood stem cell (uPBSC group) allo-SCT after a reduced-intensity conditioning (RIC) regimen...
May 31, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28598363/drug-reaction-with-eosinophilia-and-systemic-symptoms-dress-an-interplay-among-drugs-viruses-and-immune-system
#14
REVIEW
Yung-Tsu Cho, Che-Wen Yang, Chia-Yu Chu
Drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome is a severe multiorgan hypersensitivity reaction mostly caused by a limited number of eliciting drugs in patients with a genetic predisposition. Patients with DRESS syndrome present with characteristic but variable clinical and pathological features. Reactivation of human herpesviruses (HHV), especially HHV-6, is the hallmark of the disease. Anti-viral immune responses intertwined with drug hypersensitivity make the disease more complicated and protracted...
June 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28596425/outcomes-of-hematopoietic-cell-transplantation-using-donors-or-recipients-with-inherited-chromosomally-integrated-hhv-6
#15
Joshua A Hill, Amalia S Magaret, Ruth Hall-Sedlak, Anna Mikhaylova, Meei-Li Huang, Brenda M Sandmaier, John A Hansen, Keith R Jerome, Danielle M Zerr, Michael Boeckh
Human herpesvirus 6 (HHV-6) species have a unique ability to integrate into chromosomal telomeres. Mendelian inheritance via gametocyte integration results in HHV-6 in every nucleated cell. The epidemiology and clinical impact of inherited chromosomally integrated (iciHHV-6) in hematopoietic cell transplant (HCT) recipients is unclear. We identified 4,319 HCT donor-recipient pairs (8,638 subjects) who received an allogeneic HCT and had archived pre-HCT peripheral blood mononuclear cell samples. We screened these samples for iciHHV-6 and compared characteristics of HCT recipients and donors with iciHHV-6 to recipients and donors without iciHHV-6, respectively...
June 8, 2017: Blood
https://www.readbyqxmd.com/read/28580733/case-report-of-a-primary-effusion-lymphoma-successfully-treated-with-oral-valganciclovir-after-failing-chemotherapy
#16
Juan Marquet, Kyra Velazquez-Kennedy, Sandra López, Amparo Benito, María-Jesús Blanchard, Jose Antonio Garcia-Vela
Primary effusion lymphoma is a rare non-Hodgkin lymphoma that presents with pleural effusions and lacking of tumour mass. It is universally associated with human herpesvirus 8 (HHV8) and is more frequent among immunosuppressed patients. There is no standard treatment, chemotherapy and anti-HIV therapy have been used with poor results, but there is still no strong evidence supporting the use of valganciclovir. We present the case of a HIV positive man that presented with pleural effusion compatible with primary effusion lymphoma and positivity for HHV8 DNA in blood...
June 4, 2017: Hematological Oncology
https://www.readbyqxmd.com/read/28570620/viral-etiologies-in-adult-patients-with-encephalitis-in-poland-a-prospective-single-center-study
#17
Marta Popiel, Karol Perlejewski, Agnieszka Bednarska, Tomasz Dzieciątkowski, Marcin Paciorek, Dariusz Lipowski, Monika Jabłonowska, Hanna Czeszko-Paprocka, Iwona Bukowska-Ośko, Kamila Caraballo Cortes, Agnieszka Pawełczyk, Maria Fic, Andrzej Horban, Marek Radkowski, Tomasz Laskus
Encephalitis is a severe neurological syndrome associated with high morbidity and mortality as well as long-term neurological sequelae. Despite being an important public health problem, very few extensive population-based studies were conducted so far in the world and none in Central Europe. Altogether 114 consecutive patients meeting the initial criteria for encephalitis were enrolled at the Warsaw Hospital for Infectious Diseases between June 2012 and July 2015. Eighteen patients were secondarily excluded from the analysis due to incomplete data or noinfectious cause...
2017: PloS One
https://www.readbyqxmd.com/read/28562350/u94-of-human-herpesvirus-6-down-modulates-src-promotes-a-partial-mesenchymal-to-epithelial-transition-and-inhibits-tumor-cell-growth-invasion-and-metastasis
#18
Francesca Caccuri, Roberto Ronca, Andrea S Laimbacher, Angiola Berenzi, Nathalie Steimberg, Federica Campilongo, Pietro Mazzuca, Arianna Giacomini, Giovanna Mazzoleni, Anna Benetti, Elisabetta Caselli, Marco Presta, Dario Di Luca, Cornel Fraefel, Arnaldo Caruso
U94, the latency gene of human herpesvirus 6, was found to inhibit migration, invasion and proliferation of vascular endothelial cells (ECs). Because of its potent anti-migratory activity on ECs, we tested the capability of U94 to interfere with the individual steps of the metastatic cascade. We examined the U94 biological activity on the human breast cancer cell line MDA-MB 231, as a model of highly aggressive cancer cell. Here we show that the expression of U94 delivered by an HSV-1-based amplicon promoted down-modulation of Src and downstream molecules linked to cell motility and proliferation...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28543733/development-of-real-time-rt-pcr-assays-for-detection-of-three-classes-of-hhv-6a-gene-transcripts
#19
Masaru Ihira, Akiko Urashima, Hiroki Miura, Fumihiko Hattori, Yoshiki Kawamura, Ken Sugata, Tetsushi Yoshikawa
Human herpesvirus 6 (HHV-6), a member of the betaherpesvirus family, has two distinct species: HHV-6A and HHV-6B. HHV-6B real-time reverse transcription polymerase chain reaction (RT-PCR) has been used to distinguish between active and latent viral infection. In this study, we developed a real-time RT-PCR assay to detect HHV-6A-specific transcripts and evaluated its reliability for analysis of clinical samples. To develop HHV-6A-specific real-time RT-PCR assays, three different classes of gene transcripts (immediate early: U90; early: U12; and late: U100) were selected as targets...
May 23, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28542724/viruses-and-endogenous-retroviruses-in-multiple-sclerosis-from-correlation-to-causation
#20
REVIEW
A-F A Mentis, E Dardiotis, N Grigoriadis, E Petinaki, G M Hadjigeorgiou
Multiple sclerosis is an immune-mediated disease with an environmental component. According to a long-standing but unproven hypothesis dating to initial descriptions of multiple sclerosis (MS) at the end of the 19th century, viruses are either directly or indirectly implicated in MS pathogenesis. Whether viruses in MS are principally causal or simply contributory remains to be proven, but many viruses or viral elements-predominantly Epstein-Barr virus, human endogenous retroviruses (HERVs) and human herpesvirus 6 (HHV-6) but also less common viruses such as Saffold and measles viruses-are associated with MS...
May 23, 2017: Acta Neurologica Scandinavica
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