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https://www.readbyqxmd.com/read/28088708/germinal-centers-programmed-for-affinity-maturation-and-antibody-diversification
#1
REVIEW
Oliver Bannard, Jason G Cyster
The seminal discovery by Eisen that antibodies undergo improvements in antigen-binding affinity over the course of an immune response led to a long running search for the underlying mechanism. Germinal centers in lymphoid organs are now recognized to be critically involved in this phenomenon, known as antibody affinity maturation. As well as improving in affinity for specific epitopes, some antibody responses maintain or even increase their breadth of antigen-recognition over time. This has led to another intense line of research aimed at understanding how broadly neutralizing anti-pathogen responses are generated...
January 12, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28087540/international-evidence-based-consensus-diagnostic-criteria-for-hhv-8-negative-idiopathic-multicentric-castleman-disease
#2
David C Fajgenbaum, Thomas S Uldrick, Adam Bagg, Dale Frank, David Wu, Gordan Srkalovic, David Simpson, Amy Y Liu, David Menke, Shanmuganathan Chandrakasan, Mary Jo Lechowicz, Raymond S M Wong, Sheila Pierson, Michele Paessler, Jean-François Rossi, Makoto Ide, Jason Ruth, Michael Croglio, Alexander Suarez, Vera Krymskaya, Amy Chadburn, Gisele Colleoni, Sunita Nasta, Raj Jayanthan, Christopher S Nabel, Corey Casper, Angela Dispenzieri, Alexander Fosså, Dermot Kelleher, Razelle Kurzrock, Peter Voorhees, Ahmet Dogan, Kazuyuki Yoshizaki, Frits van Rhee, Eric Oksenhendler, Elaine S Jaffe, Kojo S J Elenitoba-Johnson, Megan S Lim
Human Herpesvirus-8(HHV-8)-negative, idiopathic multicentric Castleman disease (iMCD) is a rare and life-threatening disorder involving systemic inflammatory symptoms, polyclonal lymphoproliferation, cytopenias, and multiple organ system dysfunction due to a cytokine storm often including interleukin-6. iMCD accounts for one-third to one-half of all cases of MCD and can occur in individuals of any age. Accurate diagnosis is challenging, as no standard diagnostic criteria or diagnostic biomarkers currently exist, and there is significant overlap with malignant, autoimmune, and infectious disorders...
January 13, 2017: Blood
https://www.readbyqxmd.com/read/28086220/b-cell-lymphomas-involving-waldeyer-s-ring-characterized-by-distinctive-clinical-and-histopathological-features-a-comparison-of-pediatric-to-adult-patients
#3
Lei Chen, Lika'a Fasih Y Al-Kzayer, Yi Liu, Tingting Liu
B-cell lymphomas involving Waldeyer's ring (WR) comprise heterogeneous histolopathological subtypes with a wide age range and distinctive clinical features. However, the comparison between pediatric and adult patients is scarce and limited in the literature. Thirty-three cases of B-cell lymphomas involving WR, were collected and evaluated by histolopathological, immunohistochemical and FISH analyses. The 33 cases were categorized into children and adolescents referred as pediatric group (n = 12), aged (3-19) years and the adult group (n = 21), aged (20-84) years...
January 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28083854/analysis-of-prognostic-value-of-complete-response-by-pet-ct-and-further-stratification-by-clinical-and-biological-markers-in-dlbcl-patients
#4
Yusuke Kanemasa, Tatsu Shimoyama, Yuki Sasaki, Miho Tamura, Takeshi Sawada, Yasushi Omuro, Tsunekazu Hishima, Yoshiharu Maeda
Positron emission tomography-computed tomography (PET-CT) is performed as the standard method for response assessment of diffuse large B cell lymphoma (DLBCL) patients. However, a substantial proportion of patients experience relapse even if they have achieved complete response (CR) defined by PET-CT. We validated the prognostic value of CR by PET-CT and applied the National Comprehensive Cancer Network-International Prognostic Index (NCCN-IPI) and cell of origin (COO) to patients with CR by PET-CT to evaluate their additional predictive ability for survival outcomes...
February 2017: Medical Oncology
https://www.readbyqxmd.com/read/28079103/erratum-antigen-affinity-controls-pre-germinal-center-b-cell-selection-by-promoting-mcl-1-induction-through-baff-receptor-signaling
#5
Felix M Wensveen, Erik Slinger, Martijn Ha van Attekum, Robert Brink, Eric Eldering
No abstract text is available yet for this article.
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28070473/renal-infiltration-by-diffuse-large-b-cell-lymphoma-as-a-rare-cause-of-fanconi-s-syndrome-a-case-report
#6
Shoab Saadat, Syed Nayer Mahmud, Asim Qureshi
We report the case of a 16-year-old female patient with a known history of coeliac disease, who presented with the complaints of diarrhea, vomiting and generalized body weakness. On examination, she was found to have dehydration, decreased power in all her limbs, cervical lymphadenopathy and hepatosplenomegaly. Investigations showed severe hypokalemia, hyponatremia, hypomagnesemia, hypoglycemia and mildly enlarged kidneys on ultrasonography. Biopsy of the duodenum confirmed the flare up of coeliac disease, while cervical lymph node biopsy was positive for atypical lymphoid infiltrate and a morphology suggestive of non-Hodgkin's lymphoma...
November 30, 2016: Curēus
https://www.readbyqxmd.com/read/28069569/the-crebbp-acetyltransferase-is-a-haploinsufficient-tumor-suppressor-in-b-cell-lymphoma
#7
Jiyuan Zhang, Sofija Vlasevska, Victoria A Wells, Sarah Nataraj, Antony B Holmes, Romain Duval, Stefanie N Meyer, Tongwei Mo, Katia Basso, Paul K Brindle, Shafinaz Hussein, Riccardo Dalla-Favera, Laura Pasqualucci
Inactivating mutations of the CREBBP acetyltransferase are highly frequent in diffuse large B-cell lymphoma (DLBCL) and follicular lymphoma (FL), the two most common germinal-center (GC) derived cancers. However, the role of CREBBP inactivation in lymphomagenesis remains unclear. Here we show that CREBBP regulates enhancer/super-enhancer networks with central roles in GC/post-GC cell fate decisions, including genes involved in signal transduction by the B-cell receptor and CD40 receptor, transcriptional control of GC and plasma cell development, and antigen presentation...
January 9, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28069035/fbw7-regulates-apoptosis-in-activated-b-cell-like-diffuse-large-b-cell-lymphoma-by-targeting-stat3-for-ubiquitylation-and-degradation
#8
Su Yao, Fangping Xu, Yu Chen, Yan Ge, Fen Zhang, Huijie Huang, Li Li, Danyi Lin, Xinlan Luo, Jie Xu, Donglan Luo, Xiaolan Zhu, Yanhui Liu
BACKGROUND: The ubiquitin-ligase Fbw7 acts as a tumor suppressor, targeting lots of proto-oncogenes for proteolysis. However, the exact role of Fbw7 in diffuse large B-cell lymphoma (DLBCL) development remains unclear. METHODS: We evaluated Fbw7 expression in patient samples of DLBCL using immunohistochemical staining. The effect of Fbw7 overexpression on cell viability and apoptosis was investigated using activated B-cell (ABC) like DLBCL cell lines. The mechanism of Fbw7 activity in DLBCL was investigated using immunoprecipitation, ubiquitination, western blot and qualitative analyses...
January 10, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28062671/targeting-hdac3-in-crebbp-mutant-lymphomas-counterstrikes-unopposed-enhancer-deacetylation-of-b-cell-signaling-and-immune-response-genes
#9
Uta E Höpken
The cellular phenotype of B-cell lymphomas arising from B cells undergoing germinal center reactions, such as follicular lymphoma and diffuse large B-cell lymphoma, is strongly shaped by mutations in chromatin-modifying genes. The work presented by Jiang and colleagues addresses how somatic mutations in CREBBP disable acetylation and cause unopposed deacetylation by BCL6/SMRT/HDAC3 complexes on enhancers of B-cell signaling and immune response genes. This opens a therapeutic avenue toward targeted inhibition of CREBBP-mutant lymphomas by HDAC inhibitors...
January 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28060369/virus-associated-neoplasms-of-the-nasopharynx-and-sinonasal-tract-diagnostic-problems
#10
John Kc Chan
A significant fraction of nasopharyngeal and sinonasal tumors are associated with Epstein-Barr virus (EBV) or human papillomavirus (HPV). Nasopharyngeal carcinoma (NPC) and extranodal NK/T-cell lymphoma harbor EBV in practically all cases, although a small proportion of cases of the former harbor HPV. Sinonasal inverted papillomas harbor HPV in about 25% of cases. Sinonasal squamous cell carcinomas harbor transcriptionally active HPV in about 20% of cases, and limited data suggest that this subset has a better prognosis than the HPV-negative subset...
January 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28059091/identification-of-distinct-subgroups-of-ebv-positive-post-transplant-diffuse-large-b-cell-lymphoma
#11
Julie Morscio, Julio Finalet Ferreiro, Sara Vander Borght, Emilie Bittoun, Olivier Gheysens, Daan Dierickx, Gregor Verhoef, Iwona Wlodarska, Thomas Tousseyn
Post-transplantation lymphoproliferative disorder is an aggressive complication of transplantation, most frequently of diffuse large B-cell lymphoma morphology and associated with Epstein-Barr virus (EBV) infection/reactivation. In this study the microenvironment of EBV(+) (n=23) and EBV(-) (n=9) post-transplant non-germinal center B-cell diffuse large B-cell lymphoma was characterized. Of EBV(+) cases somatic hypermutation analysis, gene expression profiling, and extensive phenotyping were performed. Our results demonstrated variable cytotoxic T-cell infiltration and significantly increased CD163(+) M2 macrophage infiltration in EBV(+) compared with EBV(-) post-transplant diffuse large B-cell lymphoma...
January 6, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28057924/tyrosine-kinase-c-abl-regulates-the-survival-of-plasma-cells
#12
Yan-Feng Li, Shengli Xu, Yuhan Huang, Xijun Ou, Kong-Peng Lam
Tyrosine kinase c-Abl plays an important role in early B cell development. Its deletion leads to reduced pro- and pre-B cell generation in mice. However, its function in B cell terminal differentiation remains unexplored. Here, we used c-Abl(f/f) Aicda(cre/+) mice, in which c-Abl is ablated only in antigen-activated B cells, to study the role of c-Abl in germinal center (GC) B and antibody-secreting plasma cell formation. Upon challenge with a model antigen, we found normal GC and memory B but reduced plasma cells and antigen-specific antibody response in the mutant mice...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28057386/nanoparticles-decorated-with-viral-antigens-are-more-immunogenic-at-low-surface-density
#13
Matthew G Brewer, Anthony DiPiazza, Joshua Acklin, Changyong Feng, Andrea J Sant, Stephen Dewhurst
There is an urgent need to develop protective vaccines for high priority viral pathogens. One approach known to enhance immune responses to viral proteins is to display them on a nanoparticle (NP) scaffold. However, little is known about the effect of protein density on the B cell response to antigens displayed on NPs. To address this question HIV-1 Envelope (Env) and influenza hemagglutinin (HA) were displayed on a polystyrene-based NP scaffold at various densities - corresponding to mean antigen distances that span the range encountered on naturally occurring virions...
January 3, 2017: Vaccine
https://www.readbyqxmd.com/read/28056299/-application-of-rabbit-monoclonal-antibody-gcet2-in-diagnosis-of-diffuse-large-b-cell-lymphoma
#14
H Y Pan, X X Zhang, Y Y Weng, R Zhou
Objective: To prepare a rabbit monoclonal antibody GCET2 and to investigate its diagnostic value in the workup of diffuse large B-cell lymphoma (DLBCL). Methods: GCET2 rabbit monoclonal antibody was developed by using RabMAb(®) technology, and its specificity was confirmed by ELISA, Western blot, immunohistochemistry (IHC) and flow cytometry. A panel of immunomarkers including GCET2, CD10, bcl-6, MUM1, GCET1, FOXP1, Ki-67 and CMYC was evaluated in 81 cases of DLBCLs, 5 cases of follicular lymphomas (FL) and 2 cases of Burkitt's lymphomas...
December 8, 2016: Zhonghua Bing Li Xue za Zhi Chinese Journal of Pathology
https://www.readbyqxmd.com/read/28056297/-potential-mechanism-and-prognostic-value-of-promoter-methylation-of-prdm1-gene-in-diffuse-large-b-cell-lymphoma
#15
X Y Zhang, Z P Ma, W L Cui, R Chen, Abulajiang Glinaer, N Miao, X X Li
Objective: To investigate PRDM1 gene methylation status, immune classification and their prognostic significance in diffuse large B cell lymphoma (DLBCL). Methods: Immunohistochemical (IHC) staining for CD20, CD10, bcl-2, bcl-6, PRDM1/Blimp-1 and MUM1 was carried out in 100 cases of DLBCL specimens and 20 reactive lymphoid proliferation samples. All patients were classified into germinal center B cell-like (GCB) and activated B cell-like (ABC) subtype according to Hans' algorithmin. PRDM1 gene methylation was detected by methylation-specific PCR (MSP) and its relationship with clinicopathologic parameters was analyzed...
December 8, 2016: Zhonghua Bing Li Xue za Zhi Chinese Journal of Pathology
https://www.readbyqxmd.com/read/28039454/prognostic-value-of-expression-of-nuclear-factor-kappa-b-p65-in-non-gcb-dlbcl-patients
#16
Jing Wang, Min Zhou, Qi-Guo Zhang, Jingyan Xu, Tong Lin, Rong-Fu Zhou, Juan Li, Yong-Gong Yang, Bing Chen, Jian Ouyang
PURPOSE: We estimated the expression of nuclear factor kappa B/p65 in non-germinal center B-cell-like subtype diffuse large B-cell lymphoma, to investigate its relationship to clinicopathological features, and to further evaluate its prognostic value and clarify its impact on survival. RESULTS: Among the 49 patients enrolled in this study, 14 (28.6%) had positive p65 expression. The negative p65 group had significantly better survival compared to the positive p65 group in terms of both the 3-year estimated OS (91...
December 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/28038857/similar-prognosis-of-transformed-and-de-novo-diffuse-large-b-cell-lymphomas-in-patients-treated-with-immunochemotherapy
#17
Marc Sorigue, Olga Garcia, Maria Joao Baptista, Juan-Manuel Sancho, Gustavo Tapia, José Luis Mate, Evarist Feliu, José-Tomás Navarro, Josep-Maria Ribera
BACKGROUND: The prognosis of diffuse large B-cell lymphomas (DLBCL) transformed from indolent lymphoma (TL) has been considered poorer than that of de novo DLBCL. However, it seems to have improved since the introduction of rituximab. PATIENTS AND METHODS: We compared the characteristics (including the cell-of-origin), and the prognosis of 29 patients with TL and 101 with de novo DLBCL treated with immunochemotherapy. RESULTS: Patients with TL and de novo DLBCL had similar characteristics...
December 27, 2016: Medicina Clínica
https://www.readbyqxmd.com/read/28036248/functional-analysis-of-a-biosynthetic-cluster-essential-for-production-of-4-formylaminooxyvinylglycine-a-germination-arrest-factor-from-pseudomonas-fluorescens-wh6
#18
Rachel A Okrent, Kristin Trippe, Maciej Maselko, Viola A Manning
Rhizosphere-associated Pseudomonas fluorescens WH6 produces the germination-arrest factor, 4-formylaminooxyvinylglycine (FVG). FVG has previously been shown to both arrest the germination of weedy grasses and to inhibit the growth of the bacterial plant pathogen Erwinia amylovora. Very little is known about the mechanism by which FVG is produced. Although a previous study identified a region of the genome that may be involved in FVG biosynthesis, it has not yet been determined which genes within that region are sufficient and necessary for FVG production...
December 30, 2016: Microbiology
https://www.readbyqxmd.com/read/28035701/three-unusual-histopathological-presentations-of-angiolymphoid-hyperplasia-with-eosinophilia
#19
Angel Fernandez-Flores, David S Cassarino
Angiolymphoid hyperplasia with eosinophilia (ALHE) is a poorly understood benign vasculoproliferative disorder. Histopathologicaly, the lesions are composed of a dermal or subcutaneous proliferation of blood vessels of varying sizes with plump and bland endothelial cells, which often show vacuolization and protrusion of the cytoplasm into the lumen. The vascular proliferation is admixed with a diffuse inflammatory infiltrate composed of lymphocytes, eosinophils, and mast cells. Lymphoid follicles with germinal centers can sometimes be seen...
December 30, 2016: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28031341/differing-requirements-for-malt1-function-in-peripheral-b-cell-survival-and-differentiation
#20
Peishan Lee, Zilu Zhu, Janna Hachmann, Takuya Nojima, Daisuke Kitamura, Guy Salvesen, Robert C Rickert
During a T cell-dependent immune response, formation of the germinal center (GC) is essential for the generation of high-affinity plasma cells and memory B cells. The canonical NF-κB pathway has been implicated in the initiation of GC reaction, and defects in this pathway have been linked to immune deficiencies. The paracaspase MALT1 plays an important role in regulating NF-κB activation upon triggering of Ag receptors. Although previous studies have reported that MALT1 deficiency abrogates the GC response, the relative contribution of B cells and T cells to the defective phenotype remains unclear...
December 28, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
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