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https://www.readbyqxmd.com/read/28811348/a-critical-role-of-glutamine-and-asparagine-%C3%AE-nitrogen-in-nucleotide-biosynthesis-in-cancer-cells-hijacked-by-an-oncogenic-virus
#1
Ying Zhu, Tingting Li, Suzane Ramos da Silva, Jae-Jin Lee, Chun Lu, Hyungjin Eoh, Jae U Jung, Shou-Jiang Gao
While glutamine is a nonessential amino acid that can be synthesized from glucose, some cancer cells primarily depend on glutamine for their growth, proliferation, and survival. Numerous types of cancer also depend on asparagine for cell proliferation. The underlying mechanisms of the glutamine and asparagine requirement in cancer cells in different contexts remain unclear. In this study, we show that the oncogenic virus Kaposi's sarcoma-associated herpesvirus (KSHV) accelerates the glutamine metabolism of glucose-independent proliferation of cancer cells by upregulating the expression of numerous critical enzymes, including glutaminase 2 (GLS2), glutamate dehydrogenase 1 (GLUD1), and glutamic-oxaloacetic transaminase 2 (GOT2), to support cell proliferation...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28808378/rutamarin-an-active-constituent-from-ruta-angustifolia-pers-induced-apoptotic-cell-death-in-the-ht29-colon-adenocarcinoma-cell-line
#2
Shafinah Ahmad Suhaimi, Sok Lai Hong, Sri Nurestri Abdul Malek
BACKGROUND: Ruta angustifolia Pers. is a perennial herb that is cultivated worldwide, including Southeast Asia, for the treatment of various diseases as traditional medicine. OBJECTIVE: The purpose of the study was to identify an active principle of R. angustifolia and to investigate its effect on the HT29 cell death. MATERIALS AND METHODS: The methanol and fractionated extracts (hexane, chloroform, ethyl acetate, and water) of R. angustifolia Pers...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28806949/case-report-of-ocular-kaposi-s-sarcoma
#3
Jing Yang, Xiao-Fang Yin, Yong-Ping Li, Shi-You Zhou
BACKGROUND: Kaposi's sarcoma (KS) is generally considered a neoplastic disorder of vascular origin and occurs in patients with acquired immunodeficiency syndrome (AIDS) or who have received immunosuppressive treatments after an organ transplant (Soulier et al., Blood 86(4):1276-80, 1995; Viejo-Borbolla and Schulz, AIDS Rev 5(4):222-9, 2003; Schulz, J Antimicrob Chemother 45(Suppl T3):15-27, 2000; Aversa et al. Crit Rev Oncol Hematol 53(3):253-65, 2005; Mbulaiteye and Engels, Int J Cancer 119(11):2685-91, 2006; Tessari et al...
August 14, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28803888/cancer-risk-in-hiv-infected-people-in-the-usa-from-1996-to-2012-a-population-based-registry-linkage-study
#4
Raúl U Hernández-Ramírez, Meredith S Shiels, Robert Dubrow, Eric A Engels
BACKGROUND: Monitoring cancer risk among HIV-infected people in the modern antiretroviral therapy (ART) era is essential given their elevated risk for many cancers and prolonged survival with immunosuppression, ART exposure, and ageing. We aimed to examine cancer risk in HIV-infected people in the USA as compared with that in the general population. METHODS: We did a registry-linkage study with data from population-based HIV and cancer registries in the USA (the HIV/AIDS Cancer Match Study)...
August 10, 2017: Lancet HIV
https://www.readbyqxmd.com/read/28802146/epigenetic-manipulation-of-host-chromatin-by-kaposi-sarcoma-associated-herpesvirus-a-tumor-promoting-factor
#5
REVIEW
Thomas Günther, Adam Grundhoff
Molecular and epidemiological evidence links Kaposi sarcoma-associated herpesvirus (KSHV) to a number of malignancies of endothelial or B cell origin. As for most virus-associated cancers, however, the tumor initiating and promoting events remain poorly understood. Given the emerging role of epigenetic alterations as drivers of human cancers, an interesting (and as of yet under-explored) hypothesis is that viral manipulation of host cell chromatin may contribute to the pathogenesis of KSHV-associated tumors...
August 9, 2017: Current Opinion in Virology
https://www.readbyqxmd.com/read/28801242/oxidant-species-are-involved-in-t-b-mediated-erk1-2-phosphorylation-that-activates-p53-p21-axis-to-promote-kshv-lytic-cycle-in-pel-cells
#6
Roberta Gonnella, Shivangi Yadav, Maria Saveria Gilardini Montani, Marisa Granato, Roberta Santarelli, Alessia Garufi, Gabriella D'Orazi, Alberto Faggioni, Mara Cirone
KSHV is a gammaherpesvirus strongly associated to human cancers such as Primary Effusion Lymphoma (PEL) and Kaposi's Sarcoma. The naturally virus-infected tumor cells usually display latent infection since a minority of cells undergoes spontaneous viral replication. The lytic cycle can be induced in vitro upon appropriate stimuli such as TPA (T), alone or in combination with butyrate (B), (T/B). In previous studies, Protein Kinase C (PKC) δ, Extracellular Signal-regulated Kinase1/2 (ERK1/2) and p53-p21 axis have been separately reported to play a role in KSHV reactivation from latency...
August 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28798814/editorial-childhood-cancer-in-sub-saharan-africa
#7
EDITORIAL
Donald Maxwell Parkin, Cristina Stefan
Measurement of incidence rates of childhood cancer in Africa is difficult. The study 'Cancer of Childhood in sub Saharan Africa' [Stefan C, Bray F, Ferlay J, Parkin DM and Liu B (2017) Cancer of Childhood in sub-Saharan Africaecancer11(755)] brings together results from 16 population-based registries which, as members of the African Cancer Registry Network (AFCRN), have been evaluated as achieving adequate coverage of their target population. The cancers are classified according to the third revision of the International Classification of Childhood Cancer (ICCC-3) and recorded rates in Africa are compared with those in childhood populations in the UK, France, and the USA...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/28794035/crystal-structure-of-the-dna-binding-domain-of-human-herpesvirus-6a-immediate-early-protein-2
#8
Mitsuhiro Nishimura, Junjie Wang, Aika Wakata, Kento Sakamoto, Yasuko Mori
Immediate early proteins of human herpesvirus 6A (HHV-6A) are expressed at the outset of lytic infection, and thereby regulate viral gene expression. Immediate early protein 2 (IE2) of HHV-6A is a trans-activator that drives a variety of promoters. The C-terminal region of HHV-6A IE2 is shared among IE2 homologs in beta-herpesviruses, and is involved in dimerization, DNA binding, and transcription factor binding. In this study, the structure of the C-terminal domain (IE2-CTD) was determined by X-ray crystallography at a resolution of 2...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28790048/kaposi-s-sarcoma-of-the-tonsils
#9
Brendan Wright
No abstract text is available yet for this article.
August 8, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28777778/kshv-and-the-role-of-notch-receptor-dysregulation-in-disease-progression
#10
REVIEW
Jennifer L DeCotiis, David M Lukac
Kaposi's sarcoma-associated herpesvirus (KSHV) is the causative agent of two human cancers, Kaposi's Sarcoma (KS) and primary effusion lymphoma (PEL), and a lymphoproliferation, Multicentric Castleman's Disease (MCD). Progression to tumor development in KS is dependent upon the reactivation of the virus from its latent state. We, and others, have shown that the Replication and transcriptional activator (Rta) protein is the only viral gene product that is necessary and sufficient for viral reactivation. To induce the reactivation and transcription of viral genes, Rta forms a complex with the cellular DNA binding component of the canonical Notch signaling pathway, recombination signal binding protein for Jk (RBP-Jk)...
August 4, 2017: Pathogens
https://www.readbyqxmd.com/read/28776339/trends-in-malignancies-among-korean-patients-infected-with-human-immunodeficiency-virus-in-the-highly-active-antiretroviral-therapy-era
#11
Shinwon Lee, Sun Hee Lee, Jeong Eun Lee, Jin Suk Kang, Seung Geun Lee, Joo Seop Chung, Ihm Soo Kwak
Since the introduction of highly active antiretroviral therapy, the life span of people with human immunodeficiency virus (HIV) or AIDS (PWHA) has been extended significantly. Therefore, the importance of non-AIDS-defining cancers (NADCs), as well as AIDS-defining cancers (ADCs) has increased. There is little information concerning the epidemiology of malignancies in PWHA in Korea. A descriptive epidemiologic study was conducted at a tertiary care hospital in Korea. PWHA who visited Pusan National University Hospital from January 2000 to October 2014 were included...
September 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28769892/herpesviral-micrornas-in-cellular-metabolism-and-immune-responses
#12
REVIEW
Hyoji Kim, Hisashi Iizasa, Yuichi Kanehiro, Sintayehu Fekadu, Hironori Yoshiyama
The microRNAs (miRNAs) function as a key regulator in many biological processes through post-transcriptional suppression of messenger RNAs. Recent advancements have revealed that miRNAs are involved in many biological functions of cells. Not only host cells, but also some viruses encode miRNAs in their genomes. Viral miRNAs regulate cell proliferation, differentiation, apoptosis, and the cell cycle to establish infection and produce viral progeny. Particularly, miRNAs encoded by herpes virus families play integral roles in persistent viral infection either by regulation of metabolic processes or the immune response of host cells...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28768873/human-herpesvirus-8-infects-and-replicates-in-langerhans-cells-and-interstitial-dermal-dendritic-cells-and-impairs-their-function
#13
Giovanna Rappocciolo, Mariel Jais, Paolo A Piazza, Diana C DeLucia, Frank J Jenkins, Charles R Rinaldo
The predominant types of dendritic cells (DC) in the skin and mucosa are Langerhans cells (LC) and interstitial dermal DC (iDDC). LC and iDDC process cutaneous antigens and migrate out of the skin and mucosa to the draining lymph nodes to present antigens to T and B cells. Because of the strategic location of LC and iDDC and the ability of these cells to capture and process pathogens, we hypothesized that they could be infected with human herpesvirus 8 (HHV-8; Kaposi's sarcoma-associated herpesvirus) and have an important role in the development of Kaposi's sarcoma (KS)...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28766950/imaging-features-of-rare-mesenychmal-liver-tumors-beyond-hemangiomas
#14
Rajesh Thampy, Khaled M Elsayes, Christine O Menias, Perry J Pickhardt, Hyunseon C Kang, Sandeep Deshmukh, Kareem Ahmed, Brinda Rao Korivi
Tumors arising from mesenchymal tissue components such as vascular, fibrous and adipose tissue can manifest in the liver. Although histopathology is often necessary for definitive diagnosis, many of these lesions exhibit characteristic imaging features. The radiologist plays an important role in suggesting the diagnosis, which can direct appropriate immunohistochemical staining at histology. The aim of this review is to present clinical and imaging findings of a spectrum of mesenchymal liver tumors such as hemangioma, epithelioid hemangioendothelioma, lipoma, PEComa, angiosarcoma, inflammatory myofibroblastic tumor, solitary fibrous tumor, leiomyoma, leiomyosarcoma, Kaposi sarcoma, mesenchymal hamartoma, undifferentiated embryonal sarcoma, rhabdomyosarcoma and hepatic metastases...
August 2, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28759216/allosteric-inhibitors-crystallography-and-comparative-analysis-reveal-network-of-coordinated-movement-across-human-herpesvirus-proteases
#15
Timothy M Acker, Jonathan E Gable, Markus-Frederik Bohn, Priyadarshini Jaishankar, Michael C Thompson, James S Fraser, Adam R Renslo, Charles S Craik
Targeting of cryptic binding sites represents an attractive but underexplored approach to modulating protein function with small molecules. Using the dimeric protease (Pr) from Kaposi's sarcoma-associated herpesvirus (KSHV) as a model system, we sought to dissect a putative allosteric network linking a cryptic site at the dimerization interface to enzyme function. Five cryogenic x-ray structures were solved of the monomeric protease with allosteric inhibitors bound to the dimer interface site. Distinct coordinated movements captured by the allosteric inhibitors were also revealed as alternative states in room temperature X-ray data and comparative analyses of other dimeric herpesvirus proteases...
July 31, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28758622/assemblins-as-maturational-proteases-in-herpesviruses
#16
Martin Zühlsdorf, Winfried Hinrichs
During assembly of herpesvirus capsids, a protein scaffold self-assembles to ring-like structures forming the scaffold of the spherical procapsids. Proteolytic activity of the herpesvirus maturational protease causes structural changes that result in angularization of the capsids. In those mature icosahedral capsids, the packaging of viral DNA into the capsids can take place. The strictly regulated protease is called assemblin. It is inactive in its monomeric state and activated by dimerization. The structures of the dimeric forms of several assemblins from all herpesvirus subfamilies have been elucidated in the last two decades...
July 31, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28757763/immune-reconstitution-inflammatory-syndrome-associated-disseminated-kaposi-s-sarcoma-in-a-patient-infected-with-human-immunodeficiency-virus-report-of-an-autopsy-case
#17
Chiu-Hsuan Cheng, Yung-Hsiang Hsu
Immune reconstitution inflammatory syndrome is a collection of inflammatory disorders associated with paradoxical worsening of preexisting infectious processes following the initiation of highly active antiretroviral therapy (HAART) in individuals infected with human immunodeficiency virus (HIV). It involves a wide range of pathogens, neoplasms such as Kaposi's sarcoma (KS) and some autoimmune diseases. We describe an autopsy report of a 40-year-old man infected with HIV. He experienced a rapid dissemination of KS resulting in death within 6 months after starting HAART...
January 2017: Ci Ji Yi Xue za Zhi, Tzu-chi Medical Journal
https://www.readbyqxmd.com/read/28750175/kaposi-s-sarcoma-associated-herpesvirus-infection-promotes-differentiation-and-polarization-of-monocytes-into-tumor-associated-macrophages
#18
Natarajan Bhaskaran, Santosh K Ghosh, Xiaolan Yu, Sanhai Qin, Aaron Weinberg, Pushpa Pandiyan, Fengchun Ye
Tumor associated macrophages (TAMs) promote angiogenesis, tumor invasion and metastasis, and suppression of anti-tumor immunity. These myeloid cells originate from monocytes, which differentiate into TAMs upon exposure to the local tumor microenvironment. We previously reported that Kaposi's sarcoma-associated herpes virus (KSHV) infection of endothelial cells induces the cytokine angiopoietin-2 (Ang-2) to promote migration of monocytes into tumors. Here we report that KSHV infection of endothelial cells induces additional cytokines including interleukin-6 (IL-6), interleukin-10 (IL-10), and interleukin-13 (IL-13) that drive monocytes to differentiate and polarize into TAMs...
July 27, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28747501/mhv68-expressing-kshv-lana-reveals-both-functional-conservation-and-divergence-in-lana-homologs
#19
Arundhati Gupta, Darby G Oldenburg, Eduardo Salinas, Douglas W White, J Craig Forrest
Latency-associated nuclear antigen (LANA) is a multifunctional protein encoded by members of the Rhadinovirus genus of gammaherpesviruses. Studies using murine gammaherpesvirus 68 (MHV68) demonstrated that LANA is important for acute replication, latency establishment, and reactivation in vivo Despite structural similarities in their DNA-binding domains (DBDs), LANA homologs from Kaposi sarcoma-associated herpesvirus (KSHV) and MHV68 exhibit considerable sequence divergence. We sought to determine if KSHV and MHV68 LANA homologs are functionally interchangeable...
July 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28743856/kaposi-sarcoma-in-an-human-immunodeficiency-virus-hiv-seronegative-mediterranean-female-report-of-a-rare-case
#20
Marios Grigoriou, Konstantinia E Kofina, Aristeidis Ioannidis, Domniki K Gerasimidou, Christoforos Efthymiadis, Thomas Zaramboukas
BACKGROUND Kaposi sarcoma is a malignancy commonly linked to HIV infection or immunosuppression. An association with human herpes virus 8 (HHV-8) infection has also been reported. We present a case of classic Kaposi sarcoma in a female Mediterranean patient. CASE REPORT A 57-year-old white female of Greek ethnicity, with no history of HIV infection or immunosuppression, presented to the Surgical Out-patient Department of our Center, with complaints of extensive discolored skin lesion on both legs, initially considered as chronic vein insufficiency...
July 26, 2017: American Journal of Case Reports
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