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https://www.readbyqxmd.com/read/28724724/brct-domain-protein-brit1-influences-class-switch-recombination
#1
Wei-Feng Yen, Ashutosh Chaudhry, Bharat Vaidyanathan, William T Yewdell, Joseph N Pucella, Rahul Sharma, Yulong Liang, Kaiyi Li, Alexander Y Rudensky, Jayanta Chaudhuri
DNA double-strand breaks (DSBs) serve as obligatory intermediates for Ig heavy chain (Igh) class switch recombination (CSR). The mechanisms by which DSBs are resolved to promote long-range DNA end-joining while suppressing genomic instability inherently associated with DSBs are yet to be fully elucidated. Here, we use a targeted short-hairpin RNA screen in a B-cell lymphoma line to identify the BRCT-domain protein BRIT1 as an effector of CSR. We show that conditional genetic deletion of BRIT1 in mice leads to a marked increase in unrepaired Igh breaks and a significant reduction in CSR in ex vivo activated splenic B cells...
July 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28715488/microrna-dependent-and-independent-deregulation-of-long-non-coding-rnas-by-an-oncogenic-herpesvirus
#2
Sunantha Sethuraman, Lauren Appleby Gay, Vaibhav Jain, Irina Haecker, Rolf Renne
Kaposi's sarcoma (KS) is a highly prevalent cancer in AIDS patients, especially in sub-Saharan Africa. Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of KS and other cancers like Primary Effusion Lymphoma (PEL). In KS and PEL, all tumors harbor latent KSHV episomes and express latency-associated viral proteins and microRNAs (miRNAs). The exact molecular mechanisms by which latent KSHV drives tumorigenesis are not completely understood. Recent developments have highlighted the importance of aberrant long non-coding RNA (lncRNA) expression in cancer...
July 17, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28707393/malaria-epstein-barr-virus-infection-and-the-pathogenesis-of-burkitt-s-lymphoma
#3
Anthony R Mawson, Suvankar Majumdar
A geographical and causal connection has long been recognized between malaria, Epstein-Barr virus (EBV) infection and Burkitt's lymphoma (BL), but the underlying mechanisms remain obscure. Potential clues are that the malaria parasite Plasmodium falciparum selectively absorbs vitamin A from the host and depends on it for its biological activities; secondly, alterations in vitamin A (retinoid) metabolism have been implicated in many forms of cancer, including BL. The first author has proposed that the merozoite-stage malaria parasite, emerging from the liver, uses its absorbed vitamin A as a cell membrane destabilizer to invade the red blood cells, causing anemia and other signs and symptoms of the disease as manifestations of an endogenous form of hypervitaminosis A (Mawson AR...
July 13, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28701833/anaplastic-large-cell-lymphoma-a-great-mimic-on-cytology
#4
Mona A Agnihotri, Kanchan S Kothari, Leena P Naik, Sharada Patil
Anaplastic large cell lymphoma (ALCL) is a T-cell lymphoma, accounting for <5% of non-Hodgkin's lymphoma. Cutaneous involvement can be primary or secondary arising in systemic ALCL. The diagnostic feature in both is the presence of pleomorphic, CD30 positive hallmark cells. We present a case of ALCL in a 19-year-old male presenting as an ulcerated scalp swelling. Clinical impression was actinomycosis or scrofuloderma. Cytology smears showed large dispersed pleomorphic cells with hyperlobated nuclei and multinucleated giant cells...
July 2017: Journal of Cytology
https://www.readbyqxmd.com/read/28694706/abnormalities-in-alternative-splicing-of-angiogenesis-related-genes-and-their-role-in-hiv-related-cancers
#5
REVIEW
Nonkululeko N Mthembu, Zukile Mbita, Rodney Hull, Zodwa Dlamini
Alternative splicing of mRNA leads to an increase in proteome biodiversity by allowing the generation of multiple mRNAs, coding for multiple protein isoforms of various structural and functional properties from a single primary pre-mRNA transcript. The protein isoforms produced are tightly regulated in normal development but are mostly deregulated in various cancers. In HIV-infected individuals with AIDS, there is an increase in aberrant alternative splicing, resulting in an increase in HIV/AIDS-related cancers, such as Kaposi's sarcoma, non-Hodgkin's lymphoma, and cervical cancer...
2017: HIV/AIDS: Research and Palliative Care
https://www.readbyqxmd.com/read/28685876/eus-fna-of-the-merkel-cell-carcinoma-metastasis-to-the-pancreas-cytomorphology-and-immunocytochemistry-on-direct-cytological-smears
#6
T Stoos-Veic, M Tadic, G Aralica, V Milicic, C Tomasovic-Loncaric
OBJECTIVE: To report two cases of Merkel cell carcinoma (MCC) metastatic to the pancreas diagnosed with endoscopic ultrasound-guided-fine needle aspiration (EUS-FNA) and to add the case of concomitant chronic lymphocytic leukaemia/small lymphocytic lymphoma (CLL/SLL) and MCC to the literature. The aim is to alert the cytopathologists once more to the problems of differential diagnosis of pancreatic metastasis of MCC and to describe the possibilities of ancillary methods performed on direct cytological smears...
July 6, 2017: Cytopathology: Official Journal of the British Society for Clinical Cytology
https://www.readbyqxmd.com/read/28667038/post-transplant-lymphoproliferative-disorder-presented-in-a-form-of-primary-effusion-lymphoma-with-t-8-14
#7
Sadia Sultana, Suhair Al Salihi, Nidhi Tandon, Jesse Jaso, Nghia D Nguyen, Songlin Zhang, Jing Liu
Post-transplant lymphoproliferative disorders (PTLD) are emergent complications of organ transplantation occurring in 2% to 10% of transplanted patients. Epstein-Barr virus (EBV) infections are considered the most important factors for the development of these heterogeneous disorders. Primary effusion lymphoma (PEL) is a lymphoproliferative disorder predominantly described in patients with advanced AIDS and it is almost universally associated with human herpesvirus 8 (HHV8). In rare case, PEL also occurs in HHV8-negative patient, in the setting of hepatitis B and C virus infection...
May 2017: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/28652923/jc-virus-granule-cell-neuronopathy-onset-two-months-after-chemotherapy-for-low-grade-lymphoma
#8
Kathryn B Holroyd, Elias S Sotirchos, Scott R DeBoer, Kelly A Mills, Scott D Newsome
BACKGROUND: Granule cell neuronopathy (GCN) is a rare disease caused by the JC virus, leading to degeneration of cerebellar granule cell neurons. Primarily described in patients with AIDS, it has also been diagnosed in patients with lymphoproliferative diseases and after long-term treatment with immune-suppressing medications such as natalizumab. CASE PRESENTATION: A 69 year old woman presented with progressive ataxia which began 2 months after initiation of treatment for follicular low-grade B cell lymphoma with rituximab/bendamustine, and progressed for 2 years prior to admission...
2017: Cerebellum & Ataxias
https://www.readbyqxmd.com/read/28632297/n%C3%A3-lbiopsi-%C3%A3-r-inte-b%C3%A3-sta-metod-f%C3%A3-r-att-diagnostisera-lymfom-den-%C3%A3-kade-anv%C3%A3-ndningen-kan-ge-allvarliga-konsekvenser-f%C3%A3-r-diagnostik-forskning-och-behandlingsutveckling
#9
Rose-Marie Amini, Christer Sundström
Core needle biopsies for lymphoma diagnosis seriously affect diagnostics, treatment development and research Core needle biopsies (CNBs) are widely used in clinical diagnostic labs to aid in the diagnosis of malignant lymphomas and in latter years their use is increasing. CNBs provide a rapid method for obtaining tumour material and may be beneficial when the affected lymph nodes are located deep in the abdominal cavity or mediastinum and surgical excisional biopsies may be difficult to perform. However, according to the Swedish Haematopathology Quality and Standardization Committee, CNBs are insufficient for lymphoma diagnostic purposes and the guidelines state that material from surgical excisional biopsies are mandatory in order to obtain a robust histopathological evaluation of the lymph node architecture, cellular composition and growth pattern...
June 16, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28631636/profiling-of-peripheral-t-cell-lymphomas-in-kerala-south-india-a-5-year-study
#10
Rekha A Nair, Jayasudha Arundhathi Vasudevan, Priya Mary Jacob, Renu Sukumaran
BACKGROUND: Peripheral T-cell lymphomas (PTCLs) are non-Hodgkin's lymphomas (NHLs) with considerable variation in incidence across the world. They show a wide variety of clinicopathological features and generally associated with poor clinical outcome. Lymphoma data from different geographic regions will definitely aid in routine clinical practice and research work. PTCLs are reported with a higher frequency in Asia as compared to Western countries. OBJECTIVE: The objective of this study was to analyze the frequency and distribution of PTCLs diagnosed in a tertiary care cancer center in Kerala...
April 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28624514/bromodomain-containing-proteins-in-prostate-cancer
#11
REVIEW
Alfonso Urbanucci, Ian G Mills
Several oncogenic factors have been involved in prostate cancer progression. However, therapeutic approaches still focus on suppression of androgen receptor (AR) signaling. In fact, whereas the full-length AR incorporates a ligand-binding domain, which has become a drug target for competitive inhibitors, other transcription factors often do not have tractable binding pockets that aid drug development. Consequently drug development efforts have turned to transcription co-regulators, often chromatin-modifying enzymes or factors that bind to epigenetic modifications to chromatin...
June 14, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28619832/excess-mortality-among-hiv-infected-individuals-with-cancer-in-the-united-states
#12
Anna E Coghill, Ruth M Pfeiffer, Meredith S Shiels, Eric A Engels
Background: Human immunodefieciency virus (HIV)-infected persons are living longer in the era of effective HIV treatment, resulting in an increasing cancer burden in this population. The combined effects of HIV and cancer on mortality are incompletely understood.Methods: We examined whether individuals with both HIV and cancer have excess mortality using data from the HIV/AIDS Cancer Match Study and the National Center for Health Statistics (1996-2010). We compared age, sex, and race-stratified mortality between people with and without HIV or one of the following cancers: lung, breast, prostate, colorectum, anus, Hodgkin lymphoma, or non-Hodgkin lymphoma...
July 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28617968/diversity-of-human-herpesvirus-8-genotypes-in-patients-with-aids-and-non-aids-associated-kaposi-s-sarcoma-castleman-s-disease-and-primary-effusion-lymphoma-in-argentina
#13
Celeste Luján Pérez, Mónica I Tous
HHV-8 genotypes are distributed heterogeneously worldwide. The variable K1 gene and the conserved ORF26E region serve to genotype. The aim of the study was to characterize HHV-8 isolates from patients with AIDS, classical, and iatrogenic KS, primary effusion lymphoma and Castleman's disease and one organ donor from Argentina by analysis of ORFK1 and ORF26E regions. DNA was extracted from fresh or paraffin embedded biopsies, blood, and saliva samples and submitted to HHV-8 PCR. Phylogenetic analyses of ORFK1 showed that subtypes C (C1, C2, and C3), B1 and A (A1, A2, and A3) were present in 70...
June 15, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28610450/novel-tumor-markers-provide-improved-prediction-of-survival-after-diagnosis-of-human-immunodeficiency-virus-hiv-related-diffuse-large-b-cell-lymphoma
#14
Chun Chao, Michael J Silverberg, Lie-Hong Chen, Lanfang Xu, Otoniel Martínez-Maza, Donald I Abrams, Hongbin D Zha, Reina Haque, Jonathan Said
Existing prognostic tools for HIV + diffuse large B-cell lymphoma (DLBCL) fail to accurately predict patient outcomes. To develop a novel prognostic algorithm incorporating molecular tumor characteristics and HIV disease factors, we included 80 patients with HIV-related DLBCL diagnosed between 1996 and 2007. Immunohistochemistry staining was used to analyze the expression of 26 tumor markers. Clinical data were collected from medical records. Logistic regression and bootstrapping were used to select and assess stability of the prognostic model, respectively...
June 13, 2017: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/28606064/bacteremia-due-to-gordonia-polyisoprenivorans-case-report-and-review-of-literature
#15
Xiurong Ding, Yanhua Yu, Ming Chen, Chen Wang, Yanfang Kang, Hongman Li, Jinli Lou
BACKGROUND: Gordonia polyisoprenivorans is a ubiquitous aerobic actinomycetes bacterium that rarely cause infections in humans. Here, we report a case of G. polyisoprenivorans catheter-related bacteremia in an AIDS patient. CASE PRESENTATION: A 37-year-old man with a past medical history of AIDS-related lymphoma suffered bacteremia caused by a Gram-positive corynebacterium. The strain was identified as a Gordonia species by matrix-assisted laser desorption ionization-time of flight mass spectrometry and confirmed to G...
June 12, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28594133/diagnostic-value-of-stmn1-lmo2-hgal-aid-expression-and-1p36-chromosomal-abnormalities-in-primary-cutaneous-b-cell-lymphomas
#16
Evelyne Verdanet, Olivier Dereure, Céline René, Ariane Tempier, Assia Benammar-Hafidi, Mathieu Gallo, Eric Frouin, Luc Durand, Isabelle Gazagne, Valérie Costes-Martineau, Valère Cacheux, Vanessa Szablewski
INTRODUCTION: distinction between primary cutaneous follicular lymphoma (PCFL) and primary cutaneous marginal zone lymphoma (PCMZL) is challenging as clear-cut immunophenotypic and cytogenetic criteria to segregate both entities are lacking. MATERIALS AND METHODS: to better characterize PCFL and PCMZL and to define criteria helpful for the differential diagnosis, we compared expression of immunohistochemical markers (LMO2, HGAL, STMN1, AID, MNDA) and the presence of cytogenetic abnormalities previously described in nodal follicular lymphoma (BCL2 and BCL6 breaks, 1p36 chromosomal region deletion (del 1p36)) in a series of 48 cutaneous follicular and marginal zone lymphomas (CFL and CMZL)...
June 8, 2017: Histopathology
https://www.readbyqxmd.com/read/28592537/role-of-autophagy-in-the-hiv-1-matrix-protein-p17-driven-lymphangiogenesis
#17
Pietro Mazzuca, Stefania Marsico, Kai Schulze, Stefania Mitola, Marina C Pils, Cinzia Giagulli, Carlos A Guzman, Arnaldo Caruso, Francesca Caccuri
AIDS-related lymphomas (ARLs) are expected to increase in the future since combined antiretroviral therapy (cART) enhances the life expectancy of HIV-1-infected (HIV(+)) patients, but does not affect the occurrence of ARLs to the same extent as of other tumors. Lymphangiogenesis is essential in supporting growth and metastatic spreading of ARLs. HIV-1 does not infect the neoplastic B cells, but HIV-1 proteins have been hypothesized to play a key role in sustaining a pro-lymphangiogenic microenvironment in lymphoid organs...
June 7, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28575142/flow-cytometric-patterns-of-cd200-and-cd1d-expression-distinguish-cd10-negative-cd5-negative-mature-b-cell-lymphoproliferative-disorders
#18
Emily Mason, Olga Pozdnyakova, Betty Li, Graham Dudley, David M Dorfman
Objectives: The importance of distinguishing mature B-cell lymphoproliferative disorders (B-LPDs) is highlighted by the distinct treatments used for and varying prognoses seen in association with these different diseases. Immunophenotyping allows for accurate and efficient differentiation of many B-LPDs. Recently, we showed that CD200 is highly expressed in hairy cell leukemia (HCL) but not in marginal zone lymphoma (MZL), lymphoplasmacytic lymphoma (LPL), or hairy cell leukemia-variant (HCL-v)...
June 1, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28574963/hiv-infection-has-no-prognostic-impact-on-advanced-stage-hodgkin-lymphoma
#19
Marc Sorigué, Olga García, Gustavo Tapia, Maria-Joao Baptista, Miriam Moreno, José-Luis Mate, Juan M Sancho, Evarist Feliu, Josep-Maria Ribera, José-Tomás Navarro
OBJECTIVE: Classical Hodgkin lymphoma (cHL) is a non-AIDS-defining cancer with a good response to chemotherapy in the combined antiretroviral therapy (cART) era. The aim of the present study was to compare the characteristics, the response to treatment and the survival of advanced-stage cHL treated with adriamycin, bleomycin, vinblastine and dacarbazine (ABVD) between cART-treated HIV-positive and HIV-negative patients. DESIGN AND METHODS: We retrospectively analyzed advanced-stage cHL patients from a single institution, uniformly treated with ABVD...
June 19, 2017: AIDS
https://www.readbyqxmd.com/read/28571156/blastoid-variant-of-mantle-cell-lymphoma-with-leukemic-presentation-a-rare-case-report
#20
Ruchee Khanna, Sushma Belurkar, P Lavanya, Chethan Manohar, Manna Valiathan
Mantle Cell Lymphoma (MCL) is a type of Non-Hodgkin's lymphoma and has a wide spectrum of histopathological subtypes of which the blastoid or the blastic variant constitutes 10-15% of all cases. It is difficult to diagnose blastoid variant of MCL on the basis of morphology alone as it mimics lymphoblastic lymphoma and centroblastic large cell lymphoma, hence additional analysis like immunophenotyping and molecular studies aid in its diagnosis. We present a case of 45-year-old male who presented to medicine OPD with chief complaints of fever, fatigability and inguinal swelling...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
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