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https://www.readbyqxmd.com/read/29154209/external-signals-regulate-germinal-center-fate-determining-transcription-factors-in-the-a20-lymphoma-cell-line
#1
Juan Feng, Xin Liu, Xingya Ni, Hai Qi
Due to the apoptosis-prone nature of primary germinal center B (GCB) cells, it remains a huge challenge to dissect signals that guide their differentiation towards memory B cells and plasma cells in vitro. Here we show that the murine lymphoma cell line A20 resembles primary GCB cells in expression of GC-specific surface markers and the master transcription factor BCL6 and may serve as a useful system to model certain GCB cell behaviors in vitro. Using these cells, we found that both CD40 and B cell receptor (BCR) signaling are able to drive BCL6 downregulation, which is a prerequisite of post-GC B-cell differentiation...
November 16, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/29151814/de-novo-acute-lymphoblastic-leukemia-like-disease-of-high-grade-b-cell-lymphoma-with-myc-and-bcl2-and-or-bcl6-rearrangements-a-case-report-and-literature-review
#2
Akiko Uchida, Yasushi Isobe, Yu Uemura, Yuji Nishio, Hirotaka Sakai, Masayuki Kato, Kaori Otsubo, Masahiro Hoshikawa, Masayuki Takagi, Ikuo Miura
Background: B-cell lymphomas harboring the 8q24/MYC plus 18q21/BCL2 translocations are now referred to as high grade B-cell lymphoma with MYC and BCL2 and/or BCL6 rearrangements (HGBL-MBR). Although HGBL-MBR is frequently found in cases with diffuse large B-cell lymphoma or Burkitt lymphoma-like B-cell lymphoma, acute lymphoblastic leukemia (ALL)-like disease of HGBL-MBR (AL-HGBL-MBR) has been reported incidentally. Case presentation: A 69-year-old Japanese woman developed remittent fever and increasing systemic bone pain...
2017: BMC Clinical Pathology
https://www.readbyqxmd.com/read/29140403/klhl6-is-preferentially-expressed-in-germinal-center-derived-b-cell-lymphomas
#3
Christian A Kunder, Giovanna Roncador, Ranjana H Advani, Gabriela Gualco, Carlos E Bacchi, Jean M Sabile, Izidore S Lossos, Kexin Nie, Robert John Tibshirani, Michael R Green, Ash A Alizadeh, Yasodha Natkunam
Objectives: KLHL6 is a recently described BTB-Kelch protein with selective expression in lymphoid tissues and is most strongly expressed in germinal center B cells. Methods: Using gene expression profiling as well as immunohistochemistry with an anti-KLHL6 monoclonal antibody, we have characterized the expression of this molecule in normal and neoplastic tissues. Protein expression was evaluated in 1,058 hematopoietic neoplasms. Results: Consistent with its discovery as a germinal center marker, KLHL6 was positive mainly in B-cell neoplasms of germinal center derivation, including 95% of follicular lymphomas (106/112)...
November 11, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29133396/repression-of-mir-31-by-bcl6-stabilizes-the-helper-function-of-human-follicular-helper-t-cells
#4
A Ripamonti, E Provasi, M Lorenzo, M De Simone, V Ranzani, S Vangelisti, S Curti, R J P Bonnal, L Pignataro, S Torretta, J Geginat, G Rossetti, M Pagani, S Abrignani
Follicular helper T cells (TFHs) are a key component of adaptive immune responses as they help antibody production by B cells. Differentiation and function of TFH cells are controlled by the master gene BCL6, but it is largely unclear how this transcription repressor specifies the TFH program. Here we asked whether BCL6 controlled helper function through down-regulation of specific microRNAs (miRNAs). We first assessed miRNA expression in TFH cells and defined a TFH-specific miRNA signature. We report that hsa-miR-31-5p (miR-31) is down-regulated in TFH; we showed that BCL6 suppresses miR-31 expression by binding to its promoter; and we demonstrated that miR-31 inhibits the expression of molecules that control T-helper function, such as CD40L and SAP...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29126613/endometrial-bcl6-testing-for-the-prediction-of-in%C3%A2-vitro-fertilization-outcomes-a-cohort-study
#5
Laura D Almquist, Creighton E Likes, Benjamin Stone, Kaitlin R Brown, Ricardo Savaris, David A Forstein, Paul B Miller, Bruce A Lessey
OBJECTIVE: To evaluate endometrial BCL6 expression as a prognostic biomarker for IVF outcome in women with unexplained infertility (UI) before ET. DESIGN: Prospective cohort study. SETTING: University-associated infertility clinic. PATIENT(S): Women with UI for >1 year. INTERVENTION(S): We studied women with UI who underwent testing for endometrial BCL6, in an LH-timed midluteal phase biopsy and completed an IVF cycle and ET...
November 7, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/29112016/b-lymphoblastic-leukemia-lymphoma-with-burkitt-like-morphology-and-igh-myc-rearrangement-report-of-3-cases-in-adult-patients
#6
Yiting Li, Gunjan Gupta, Ari Molofsky, Yi Xie, Nader Shihabi, Jane McCormick, Elaine S Jaffe
Isolated MYC rearrangement without other recurrent genetic abnormalities is rare in B lymphoblastic leukemia/lymphoma (B-ALL/LBL), with most cases reported in pediatric patients. We report 3 adult cases with lymphoblasts showing a precursor B cell immunophenotype, and isolated MYC/IGH translocation. All 3 cases occurred in male patients with initial presentation of diffuse lymphadenopathy. Cases 1 and 2 had B-ALL with significantly increased lymphoblasts in peripheral blood and bone marrow. Case 3, a patient with human immunodeficiency virus infection, had the diagnosis of B-LBL made on a retroperitoneal lymph node biopsy and had no peripheral blood or bone marrow involvement...
November 3, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29104620/expression-of-and-correlation-between-bcl6-and-zeb-family-members-in-patients-with-breast-cancer
#7
Lin Ang, Li Zheng, Jin Wang, Jin Huang, Hong-Guang Hu, Qiang Zou, Yang Zhao, Qiang-Ming Liu, Min Zhao, Zheng-Sheng Wu
B-cell lymphoma 6 (BCL6), a proto-oncogene, is an evolutionarily conserved zinc finger protein that functions as a transcriptional repressor. BCL6 is the master regulator of B-lymphocyte development, and it has been reported that BCL6 may serve an important role in breast cancer progression. The aim of the present study was to investigate the expression of BCL6, zinc finger E-box-binding homeobox (ZEB)1 and ZEB2 and their associations in breast cancer. The mRNA and protein expression of BCL6, ZEB1 and ZEB2 was assessed using in situ hybridization and immunohistochemistry, respectively, in 228 patients with breast cancer and 80 patients with benign breast disease...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29101361/high-intensity-uv-laser-chip-seq-for-the-study-of-protein-dna-interactions-in-living-cells
#8
Arndt Steube, Tino Schenk, Alexander Tretyakov, Hans Peter Saluz
Genome-wide mapping of transcription factor binding is generally performed by chemical protein-DNA crosslinking, followed by chromatin immunoprecipitation and deep sequencing (ChIP-seq). Here we present the ChIP-seq technique based on photochemical crosslinking of protein-DNA interactions by high-intensity ultraviolet (UV) laser irradiation in living mammalian cells (UV-ChIP-seq). UV laser irradiation induces an efficient and instant formation of covalent "zero-length" crosslinks exclusively between nucleic acids and proteins that are in immediate contact, thus resulting in a "snapshot" of direct protein-DNA interactions in their natural environment...
November 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/29097500/a-bio-clinical-prognostic-model-using-myc-and-bcl2-predicts-outcome-in-relapsed-refractory-diffuse-large-b-cell-lymphoma
#9
Mark Bosch, Ariz Akhter, Bingshu E Chen, Adnan Mansoor, David Lebrun, David Good, Michael Crump, Lois Shepherd, David W Scott, Douglas A Stewart
The objective of this study was to create a bio-clinical model, based on clinical and molecular predictors of event-free and overall survival for relapsed/refractory diffuse large B-cell lymphoma patients treated on the Canadian Cancer Trials Group LY12 prospective study. Sufficient histologic material was available for 91 cases to create tissue microarrays and perform immunohistochemistry staining for CD10, BCL6, MUM1/IRF4, FOXP1, LMO2, BCL2, MYC, P53 and pySTAT3 expression. 67 cases had material sufficient for fluorescent in-situ hybridization for MYC and BCL2...
November 2, 2017: Haematologica
https://www.readbyqxmd.com/read/29084061/tissue-thickness-effects-on-immunohistochemical-staining-intensity-of-markers-of-cancer
#10
Adrienne S McCampbell, Varun Raghunathan, May Tom-Moy, Richard K Workman, Rick Haven, Amir Ben-Dor, Ole F Rasmussen, Lars Jacobsen, Martin Lindberg, N Alice Yamada, Carol Schembri
High-quality patient samples are required for reliable immunohistochemistry test outcomes that provide a significant benefit for patient care. Among the preanalytic variables in tissue handling, tissue thickness is thought to be easily controlled; however, whether the thickness of the tissue effects the staining intensity for antibody immunohistochemistry has not been quantitatively demonstrated. To investigate, we cut multiblock tissue sections of tonsil, liver, and kidney at 2, 4, 6, and 8 μm thicknesses...
October 27, 2017: Applied Immunohistochemistry & Molecular Morphology: AIMM
https://www.readbyqxmd.com/read/29074044/dnmt1-is-predictive-of-survival-and-associated-with-ki-67-expression-in-r-chop-treated-diffuse-large-b-cell-lymphomas
#11
Suet Kee Loo, Ewe Seng Ch'ng, Charles H Lawrie, María Arestin Muruzabal, Ayman Gaafar, María Puente Pomposo, Azlan Husin, Md Salzihan Md Salleh, Alison H Banham, Lars M Pedersen, Michael B Møller, Tina M Green, Kah Keng Wong
DNMT1 is a target of approved anti-cancer drugs including decitabine. However, the prognostic value of DNMT1 protein expression in R-CHOP-treated diffuse large B-cell lymphomas (DLBCLs) remains unexplored. Here we showed that DNMT1 was expressed in the majority of DLBCL cases (n = 209/230, 90.9%) with higher expression in germinal centre B-cell-like (GCB)-DLBCL subtype. Low and negative DNMT1 expression (20% cut-off, n = 33/230, 14.3%) was predictive of worse overall survival (OS; p < 0.001) and progression-free survival (PFS; p < 0...
October 23, 2017: Pathology
https://www.readbyqxmd.com/read/29072703/bcl6-attenuates-renal-inflammation-via-negative-regulation-of-nlrp3-transcription
#12
Dan Chen, Xiao-Qing Xiong, Ying-Hao Zang, Ying Tong, Bing Zhou, Qi Chen, Yue-Hua Li, Xing-Ya Gao, Yu-Ming Kang, Guo-Qing Zhu
Renal inflammation contributes to the pathogeneses of hypertension. This study was designed to determine whether B-cell lymphoma 6 (BCL6) attenuates renal NLRP3 inflammasome activation and inflammation and its underlying mechanism. Male spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY) were used in the present study. Angiotensin (Ang) II or lipopolysaccharides (LPS) was used to induce inflammation in HK-2 cells, a human renal tubular epithelial (RTE) cell line. NLRP3 inflammasome was activated and BCL6 was downregulated in the kidneys of SHR...
October 26, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29056123/immunohistochemical-expression-of-cd10-bcl6-and-mum1-in-differentiating-diffuse-large-b-cell-lymphoma-subtypes
#13
Akhter Ali Bajwa, Muhammad Tahir Khadim, Hafeez Ud Din, Syed Salman Ali, Unaiza Jamil, Umair Aslam Shahzad Khan
OBJECTIVE: To determine the immunohistochemical expression of CD10, BCL6 and MUM1 in differentiating diffuse large B cell lymphoma subtypes. STUDY DESIGN: Descriptive, cross-sectional study. PLACE AND DURATION OF STUDY: Department of Histopathology, Armed Forces Institute of Pathology, Rawalpindi, from November 2014 to May 2015. METHODOLOGY: Newly diagnosed cases of DLBCLon H&E stain as well as IHC markers, according to WHO blue book 2008, were included in the study...
October 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/29045832/utx-kdm6a-loss-enhances-the-malignant-phenotype-of-multiple-myeloma-and-sensitizes-cells-to-ezh2-inhibition
#14
Teresa Ezponda, Daphné Dupéré-Richer, Christine M Will, Eliza C Small, Nobish Varghese, Tej Patel, Behnam Nabet, Relja Popovic, Jon Oyer, Marinka Bulic, Yupeng Zheng, Xiaoxiao Huang, Mrinal Y Shah, Sayantan Maji, Alberto Riva, Manuela Occhionorelli, Giovanni Tonon, Neil Kelleher, Jonathan Keats, Jonathan D Licht
Loss or inactivation of the histone H3K27 demethylase UTX occurs in several malignancies, including multiple myeloma (MM). Using an isogenic cell system, we found that loss of UTX leads to deactivation of gene expression ultimately promoting the proliferation, clonogenicity, adhesion, and tumorigenicity of MM cells. Moreover, UTX mutant cells showed increased in vitro and in vivo sensitivity to inhibition of EZH2, a histone methyltransferase that generates H3K27me3. Such sensitivity was related to a decrease in the levels of IRF4 and c-MYC and an activation of repressors of IRF4 characteristic of germinal center B cells such as BCL6 and IRF1...
October 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/29042531/extrafollicular-cd4-t-b-interactions-are-sufficient-for-inducing-autoimmune-like-chronic-graft-versus-host-disease
#15
Ruishu Deng, Christian Hurtz, Qingxiao Song, Chanyu Yue, Gang Xiao, Hua Yu, Xiwei Wu, Markus Muschen, Stephen Forman, Paul J Martin, Defu Zeng
Chronic graft-versus-host disease (cGVHD) is an autoimmune-like syndrome mediated by pathogenic CD4(+) T and B cells, but the function of extrafollicular and germinal center CD4(+) T and B interactions in cGVHD pathogenesis remains largely unknown. Here we show that extrafollicular CD4(+) T and B interactions are sufficient for inducing cGVHD, while germinal center formation is dispensable. The pathogenesis of cGVHD is associated with the expansion of extrafollicular CD44(hi)CD62(lo)PSGL-1(lo)CD4(+) (PSGL-1(lo)CD4(+)) T cells...
October 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29029245/host-transcription-profile-in-nasal-epithelium-and-whole-blood-of-hospitalised-children-under-two-years-of-age-with-respiratory-syncytial-virus-infection
#16
Lien Anh Ha Do, Johann Pellet, H Rogier van Doorn, Anh Tuan Tran, Bach Hue Nguyen, Thi Thu Loan Tran, Quynh Huong Tran, Quoc Bao Vo, Nguyen Anh Tran Dac, Hong Nhien Trinh, Thi Thanh Hai Nguyen, Bao Tinh Le Binh, Huu Mai Khanh Nguyen, Minh Tien Nguyen, Quang Tung Thai, Thanh Vu Vo, Ngoc Quang Minh Ngo, Thi Kim Huyen Dang, Ngoc Huong Cao, Thu Van Tran, Lu Viet Ho, Bertrand De Meulder, Charles Auffray, Jorrit-Jan Hofstra, Jeremy Farrar, Juliet E Bryant, Menno de Jong, Martin L Hibberd
Most insights into the cascade of immune events following acute respiratory syncytial virus (RSV) infection have been obtained from animal experiments or in vitro models. Here we investigated host gene expression profiles in nasopharyngeal swabs (NP) and whole blood samples during natural RSV and rhinovirus (hRV) infection (acute versus early recovery phase) in 83 hospitalised patients <2 years old with lower respiratory tract infections (LRTI). RSV infection induced strong and persistent innate immune responses including interferon signaling and pathways related to chemokine/cytokine signaling in both compartments...
September 27, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29021516/human-herpesvirus-8-unrelated-primary-effusion-lymphoma-like-lymphoma-following-tyrosine-kinase-inhibitor-treatment-for-chronic-myelogenous-leukemia
#17
Minoru Kojima, Naoya Nakamura, Jun Amaki, Hiroki Numata, Masashi Miyaoka, Tadashi Motoori, Koshi Matsumoto, Kiyoshi Ando
A 69-year-old man was diagnosed with chronic myelogenous leukemia (CML) and treated with dasatinib. After two years on dasatinib, the patient achieved complete molecular response, but dasatinib treatment was discontinued due to exacerbation of pleural effusion. Nilotinib and imatinib were started but stopped due to an increase in pleural effusion. Thoracentesis was performed and he was diagnosed with human herpesvirus 8-unrelated primary effusion lymphoma (PEL)-like lymphoma. Complex chromosomal abnormality, including BCL6 rearrangement, was found on chromosome analysis...
2017: Journal of Clinical and Experimental Hematopathology: JCEH
https://www.readbyqxmd.com/read/29021515/clinicopathological-analysis-of-320-cases-of-diffuse-large-b-cell-lymphoma-using-the-hans-classifier
#18
Akifumi Ichiki, Joaquim Carreras, Masashi Miyaoka, Yara Yukie Kikuti, Tadashi Jibiki, Kei Tazume, Shigeki Watanabe, Tamotsu Sasao, Yoshiaki Obayashi, Makoto Onizuka, Ken Ohmachi, Fumiaki Yoshiba, Yukari Shirasugi, Yoshiaki Ogawa, Hiroshi Kawada, Naoya Nakamura, Kiyoshi Ando
The estimation of clinical prognosis for diffuse large B-cell lymphoma (DLBCL) with a quick, cost-efficient method is necessary because of the clinical heterogeneity of this disease, which leads to death, relapsed or refractory disease in approximately 40% of patients. We analyzed 320 cases diagnosed from 2007 to 2013 treated with R-CHOP therapy at Tokai University Hospital and associated institutions. DLBCL was classified according to the cell-of-origin using the Hans algorithm [germinal center B-cell-like (GCB) vs non-GCB subtypes], and into 6 subgroups derived from combinations of CD10, BCL6 and MUM1 markers...
2017: Journal of Clinical and Experimental Hematopathology: JCEH
https://www.readbyqxmd.com/read/28984304/clinicopathological-and-genomic-analysis-of-double-hit-follicular-lymphoma-comparison-with-high-grade-b-cell-lymphoma-with-myc-and-bcl2-and-or-bcl6-rearrangements
#19
Masashi Miyaoka, Yara Y Kikuti, Joaquim Carreras, Haruka Ikoma, Shinichiro Hiraiwa, Akifumi Ichiki, Minoru Kojima, Kiyoshi Ando, Tomoyuki Yokose, Rika Sakai, Masahiro Hoshikawa, Naoto Tomita, Ikuo Miura, Katsuyoshi Takata, Tadashi Yoshino, Jun Takizawa, Silvia Bea, Elias Campo, Naoya Nakamura
Most high-grade B-cell lymphomas with MYC and BCL2 and/or BCL6 rearrangements are aggressive B-cell lymphomas. Occasional double-hit follicular lymphomas have been described but the clinicopathological features of these tumors are not well known. To clarify the characteristics of double-hit follicular lymphomas, we analyzed 10 cases of double-hit follicular lymphomas and 15 cases of high-grade B-cell lymphomas with MYC and BCL2 and/or BCL6 rearrangements for clinicopathological and genome-wide copy-number alterations and copy-neutral loss-of-heterozygosity profiles...
October 6, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28973975/identification-of-linkages-between-edcs-in-personal-care-products-and-breast-cancer-through-data-integration-combined-with-gene-network-analysis
#20
Hyeri Jeong, Jongwoon Kim, Youngjun Kim
Approximately 1000 chemicals have been reported to possibly have endocrine disrupting effects, some of which are used in consumer products, such as personal care products (PCPs) and cosmetics. We conducted data integration combined with gene network analysis to: (i) identify causal molecular mechanisms between endocrine disrupting chemicals (EDCs) used in PCPs and breast cancer; and (ii) screen candidate EDCs associated with breast cancer. Among EDCs used in PCPs, four EDCs having correlation with breast cancer were selected, and we curated 27 common interacting genes between those EDCs and breast cancer to perform the gene network analysis...
September 30, 2017: International Journal of Environmental Research and Public Health
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