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https://www.readbyqxmd.com/read/29325245/-clinical-characteristics-of-high-grade-b-cell-lymphomas-with-rearrangement-of-myc-bcl-6-and-bcl-2
#1
J Y Gong, Y Z Zhang, J D Zhang, W Zhang, J Q Li, K Ru, E B Liu
Objective: To investigate the clinicopathologic features of patients with high-grade B-cell lymphomas (HGBL) that have rearrangements of MYC, bcl-6 and bcl-2. Methods: One hundred and fifty-eight B-cell lymphomas patients from Institute of Hematology and Blood Diseases Hospital from January 2016 to April 2017 were detected by fluorescence in situ hybridization (FISH) with double color split-apart probes. Results: Among 158 B-cell lymphomas, 3 cases with MYC, bcl-2 and bcl-6 rearrangements were identified, 1 of which also had CCND1/IgH translocation...
January 8, 2018: Zhonghua Bing Li Xue za Zhi Chinese Journal of Pathology
https://www.readbyqxmd.com/read/29324805/intranasal-vaccination-with-m2e5x-virus-like-particles-induces-humoral-and-cellular-immune-responses-conferring-cross-protection-against-heterosubtypic-influenza-viruses
#2
Young-Tae Lee, Eun-Ju Ko, Youri Lee, Ki-Hye Kim, Min-Chul Kim, Yu-Na Lee, Sang-Moo Kang
Current influenza vaccines do not provide broad cross-protection. Here, we report that intranasal vaccination with virus-like particles containing the highly conserved multiple ectodomains of matrix protein 2 (M2e5x VLP) of influenza virus induces broad cross-protection by M2-specific humoral and cellular immune responses. M2e5x VLP intranasal vaccination prevented severe weight loss, attenuated inflammatory cytokines and cellular infiltrates, and lowered viral loads, and induced germinal center phenotypic B and plasma cells...
2018: PloS One
https://www.readbyqxmd.com/read/29321276/ifn-regulatory-factor-3-balances-th1-and-t-follicular-helper-immunity-during-nonlethal-blood-stage-plasmodium-infection
#3
Kylie R James, Megan S F Soon, Ismail Sebina, Daniel Fernandez-Ruiz, Gayle Davey, Urijah N Liligeto, Arya Sheela Nair, Lily G Fogg, Chelsea L Edwards, Shannon E Best, Lianne I M Lansink, Kate Schroder, Jane A C Wilson, Rebecca Austin, Andreas Suhrbier, Steven W Lane, Geoffrey R Hill, Christian R Engwerda, William R Heath, Ashraful Haque
Differentiation of CD4+ Th cells is critical for immunity to malaria. Several innate immune signaling pathways have been implicated in the detection of blood-stage Plasmodium parasites, yet their influence over Th cell immunity remains unclear. In this study, we used Plasmodium-reactive TCR transgenic CD4+ T cells, termed PbTII cells, during nonlethal P. chabaudi chabaudi AS and P. yoelii 17XNL infection in mice, to examine Th cell development in vivo. We found no role for caspase1/11, stimulator of IFN genes, or mitochondrial antiviral-signaling protein, and only modest roles for MyD88 and TRIF-dependent signaling in controlling PbTII cell expansion...
January 10, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29310838/a-leukemic-double-hit-follicular-lymphoma-associated-with-a-complex-variant-translocation-t-8-14-18-q24-q32-q21-involving-bcl2-myc-and-igh
#4
Daisuke Minakata, Kazuya Sato, Takashi Ikeda, Yumiko Toda, Shoko Ito, Kiyomi Mashima, Kento Umino, Hirofumi Nakano, Ryoko Yamasaki, Kaoru Morita, Yasufumi Kawasaki, Miyuki Sugimoto, Chihiro Yamamoto, Masahiro Ashizawa, Kaoru Hatano, Iekuni Oh, Shin-Ichiro Fujiwara, Ken Ohmine, Hirotoshi Kawata, Kazuo Muroi, Ikuo Miura, Yoshinobu Kanda
Double-hit lymphoma (DHL) is defined as lymphoma with concurrent BCL2 and MYC translocations. While the most common histological subtype of DHL is diffuse large B-cell lymphoma, the present patient had leukemic follicular lymphoma (FL). A 52-year-old man was admitted to our hospital due to general fatigue and cervical and inguinal lymph node swelling. The patient was leukemic and the pathological diagnosis of the inguinal lymph node was FL grade 1. Chromosomal analysis revealed a complex karyotype including a rare three-way translocation t(8;14;18)(q24;q32;q21) involving the BCL2, MYC, and IGH genes...
January 2018: Cancer Genetics
https://www.readbyqxmd.com/read/29309299/comparison-of-myocyte-enhancer-factor-2b-versus-other-germinal-center-associated-antigens-in-the-differential-diagnosis-of-b-cell-non-hodgkin-lymphomas
#5
Erika M Moore, Steven H Swerdlow, Sarah E Gibson
Myocyte enhancer binding factor 2B (MEF2B) is a transcriptional activator of the BCL6 proto-oncogene in normal germinal center (GC) B-cells. Limited data exists concerning its expression in B-cell lymphomas, and comparison with other GC-associated antigens is lacking. Its role in the differential diagnosis of B-cell lymphomas, particularly in the distinction of follicular lymphoma (FL) versus marginal zone lymphoma (MZL), remains to be determined. We evaluated MEF2B expression, in comparison with additional GC markers, LIM domain-only transcription factor 2 (LMO2), and human GC-associated lymphoma (HGAL), in a variety of B-cell lymphomas, with particular emphasis on their utility in differentiating FL from MZL...
January 5, 2018: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29303024/bortezomib-in-combination-with-dose-adjusted-epoch-etoposide-prednisone-vincristine-cyclophosphamide-and-doxorubicin-induces-long-term-survival-in-patients-with-plasmablastic-lymphoma-a-retrospective-analysis
#6
Christopher Dittus, Natalie Grover, Steven Ellsworth, Xianming Tan, Steven I Park
Plasmablastic lymphoma (PBL) is a rare and aggressive form of B-cell non-Hodgkin lymphoma. This subtype of lymphoma has a post-germinal center cell-of-origin called the plasmablast, and the immunophenotype is more consistent with that of a plasma cell than a lymphocyte. Because of these unique features, PBL is notoriously difficult to treat. Case reports and small reviews have evaluated the addition of agents directed against plasma cell disorders in combination with traditional lymphoma-directed regimens. We describe the largest case series to date, with the longest follow-up, evaluating bortezomib in combination with etoposide, prednisone, vincristine, cyclophosphamide, and doxorubicin (V-EPOCH) for the treatment of PBL...
January 5, 2018: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/29296858/successful-desensitization-with-proteasome-inhibition-and-costimulation-blockade-in-sensitized-nonhuman-primates
#7
Jean Kwun, Christopher Burghuber, Miriam Manook, Brian Ezekian, Jaeberm Park, Janghoon Yoon, John S Yi, Neal Iwakoshi, Adriana Gibby, Jung Joo Hong, Alton B Farris, Allan D Kirk, Stuart J Knechtle
The detrimental effects of donor-directed antibodies in sensitized transplant patients remain a difficult immunologic barrier to successful organ transplantation. Antibody removal is often followed by rebound. Proteasome inhibitors (PIs) deplete antibody-producing plasma cells (PCs) but have shown marginal benefit for desensitization. In an allosensitized nonhuman primate (NHP) model, we observed increased germinal center (GC) formation after PI monotherapy, suggesting a compensatory PC repopulation mediated via GC activation...
November 14, 2017: Blood Advances
https://www.readbyqxmd.com/read/29289361/the-pathobiology-of-primary-testicular-diffuse-large-b-cell-lymphoma-implications-for-novel-therapies
#8
REVIEW
David D W Twa, Anja Mottok, Kerry J Savage, Christian Steidl
Primary testicular lymphomas (PTL) are the most prevalent type of testicular cancer arising in men over the age of 60. PTL accounts for approximately 1-2% of all non-Hodgkin lymphomas and most present with localized disease but despite this, outcome is poor. The majority of cases represent an extranodal manifestation of diffuse large B-cell lymphoma (DLBCL), known as primary testicular DLBCL (PT-DLBCL). Gene expression profiling has established that over 75% of PT-DLBCLs resemble the activated B-cell-like (ABC) or non-germinal center subtype of nodal DLBCL...
December 20, 2017: Blood Reviews
https://www.readbyqxmd.com/read/29288344/fdc-tfh-interactions-within-cervical-lymph-nodes-of-siv-infected-rhesus-macaques
#9
Rajnish S Dave, Ravi K Sharma, Roshell R Muir, Elias Haddad, Sanjeev Gumber, Francois Villinger, Artinder P Nehra, Zafar K Khan, Brian Wigdahl, Aftab A Ansari, Siddappa N Byrareddy, Pooja Jain
Cerebrospinal fluid (CSF) drains via the lymphatic drainage pathway. This lymphatic pathway connects the central nervous system (CNS) to the cervical lymph node (CLN). As the CSF drains to CLN via the dural and nasal lymphatics, T cells and antigen presenting cells pass along the channels from the subarachnoid space through the cribriform plate. Human immunodeficiency virus (HIV) may also egress from the CNS along this pathway. As a result, HIV egressing from the CNS may accumulate within the CLN. Towards this objective, we analyzed CLNs isolated from rhesus macaques that were chronically-infected with simian immunodeficiency virus (SIV)...
December 29, 2017: Journal of Neuroimmune Pharmacology: the Official Journal of the Society on NeuroImmune Pharmacology
https://www.readbyqxmd.com/read/29288206/il-4-induced-gene-1-a-negative-immune-checkpoint-controlling-b-cell-differentiation-and-activation
#10
Lloyd Bod, Laetitia Douguet, Cédric Auffray, Renée Lengagne, Fériel Bekkat, Elena Rondeau, Valérie Molinier-Frenkel, Flavia Castellano, Yolande Richard, Armelle Prévost-Blondel
Emerging data highlight the crucial role of enzymes involved in amino acid metabolism in immune cell biology. IL-4-induced gene-1 (IL4I1), a secreted l-phenylalanine oxidase expressed by APCs, has been detected in B cells, yet its immunoregulatory role has only been explored on T cells. In this study, we show that IL4I1 regulates multiple steps in B cell physiology. Indeed, IL4I1 knockout mice exhibit an accelerated B cell egress from the bone marrow, resulting in the accumulation of peripheral follicular B cells...
December 29, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29288200/ezh2-represses-the-b-cell-transcriptional-program-and-regulates-antibody-secreting-cell-metabolism-and-antibody-production
#11
Muyao Guo, Madeline J Price, Dillon G Patterson, Benjamin G Barwick, Robert R Haines, Anna K Kania, John E Bradley, Troy D Randall, Jeremy M Boss, Christopher D Scharer
Epigenetic remodeling is required during B cell differentiation. However, little is known about the direct functions of epigenetic enzymes in Ab-secreting cells (ASC) in vivo. In this study, we examined ASC differentiation independent of T cell help and germinal center reactions using mice with inducible or B cell-specific deletions of Ezh2 Following stimulation with influenza virus or LPS, Ezh2-deficient ASC poorly proliferated and inappropriately maintained expression of inflammatory pathways, B cell-lineage transcription factors, and Blimp-1-repressed genes, leading to fewer and less functional ASC...
December 29, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29287996/precursor-frequency-and-affinity-determine-b-cell-competitive-fitness-in-germinal-centers-tested-with-germline-targeting-hiv-vaccine-immunogens
#12
Robert K Abbott, Jeong Hyun Lee, Sergey Menis, Patrick Skog, Meghan Rossi, Takayuki Ota, Daniel W Kulp, Deepika Bhullar, Oleksandr Kalyuzhniy, Colin Havenar-Daughton, William R Schief, David Nemazee, Shane Crotty
How precursor frequencies and antigen affinities impact interclonal B cell competition is a particularly relevant issue for candidate germline-targeting HIV vaccine designs because of the in vivo rarity of naive B cells that recognize broadly neutralizing epitopes. Knowing the frequencies and affinities of HIV-specific VRC01-class naive human B cells, we transferred B cells with germline VRC01 B cell receptors into congenic recipients to elucidate the roles of precursor frequency, antigen affinity, and avidity on B cell responses following immunization...
December 26, 2017: Immunity
https://www.readbyqxmd.com/read/29282771/consistency-of-the-moreau-cll-score
#13
Marc Sorigue, Edurne Sarrate, Mireia Franch-Sarto, Evarist Feliu, Jordi Junca
BACKGROUND: The Moreau score is essential for the diagnosis of B-cell lymphoproliferative disorders (B-LPD). METHODS: We assessed the consistency of the Moreau score in a series of 138 patients with at least two samples involved by a B-LPD (316 samples) other than germinal center-derived malignancies, hairy cell leukemia, and mantle cell lymphomas. Patients with evidence of two distinct B-LPDs were also excluded. RESULTS: We found 53 inconsistencies in 44 of 138 (32%) patients...
December 28, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29282308/b-cell-intrinsic-myd88-signaling-promotes-initial-cell-proliferation-and-differentiation-to-enhance-the-germinal-center-response-to-a-virus-like-particle
#14
Meijie Tian, Zhaolin Hua, Sheng Hong, Zhimin Zhang, Can Liu, Lin Lin, Jiaorong Chen, Wei Zhang, Xuyu Zhou, Fuping Zhang, Anthony L DeFranco, Baidong Hou
Although TLR signaling in B cells has been implicated in the germinal center (GC) responses during viral infections and autoimmune diseases, the underlying mechanism is unclear. Bacterial phage Qβ-derived virus-like particle (Qβ-VLP) contains TLR ligands, which can enhance Qβ-VLP-induced Ab response, including GC response, through TLR/MyD88 signaling in B cells. In this study, by examining Ag-specific B cell response to Qβ-VLP, we found that lack of B cell MyD88 from the beginning of the immune response led to a more severe defect in the GC scale than abolishing MyD88 at later time points of the immune response...
December 27, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29281817/targeted-elimination-of-immunodominant-b-cells-drives-the-germinal-center-reaction-toward-subdominant-epitopes
#15
Murillo Silva, Thao H Nguyen, Phaethon Philbrook, Matthew Chu, Olivia Sears, Stephen Hatfield, Robert K Abbott, Garnett Kelsoe, Michail V Sitkovsky
Rapidly evolving pathogens such as HIV or influenza can quickly mutate their antigenic profiles, reducing the efficacy of conventional vaccines. Despite this challenge, functionally required epitopes are highly conserved among heterologous viral strains and represent a key vulnerability that could be targeted during vaccine development. As the antigenicity of these conserved epitopes is frequently subdominant, there is a critical need for innovative vaccination strategies designed to target these neutralizing epitopes...
December 26, 2017: Cell Reports
https://www.readbyqxmd.com/read/29279354/germinal-centers-determine-the-prognostic-relevance-of-tertiary-lymphoid-structures-and-are-impaired-by-corticosteroids-in-lung-squamous-cell-carcinoma
#16
Karina Silina, Alex Soltermann, Farkhondeh Movahedian Attar, Ruben Casanova, Zina M Uckeley, Helen Thut, Muriel Wandres, Sergejs Isajevs, Phil F Cheng, Alessandra Curioni Fontecedro, Periklis Foukas, Mitchell P Levesque, Holger Moch, Aija Linē, Maries van den Broek
In solid tumors, the presence of lymph node-like structures called tertiary lymphoid structures (TLS) is associated with improved patient survival. However, little is known about how TLS form in cancer, how their function affects survival, and whether they are affected by cancer therapy. In this study, we used multi-spectral microscopy, quantitative pathology and gene expression profiling to analyze TLS formation in human lung squamous cell carcinoma (LSCC) and in an experimental model of lung TLS induction...
December 26, 2017: Cancer Research
https://www.readbyqxmd.com/read/29275417/cytomorphological-findings-of-follicular-dendritic-cell-sarcoma-on-fine-needle-aspiration-cytology
#17
Sandeep S Ojha, Rubal Jain, Farah Meenai, Ramrao Nilkanthe, Amit Haritwal
BACKGROUND: Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm arising from follicular dendritic cells of germinal centers. The most common site of origin is lymph nodes and it may mimic a variety of tumors at that location, including carcinomas and sarcomas. Diagnosis is frequently missed on cytology as there are very few case reports describing the cytological characteristics of the lesion. Even on histology, a high degree of suspicion is required for an appropriate diagnosis...
December 23, 2017: Acta Cytologica
https://www.readbyqxmd.com/read/29263744/primary-central-nervous-system-germinal-center-b-like-diffuse-large-b-cell-lymphoma-a-case-report
#18
Xiaoqing Wang
We report a case of a 54-year-old HIV-negative female who presented with a 2-month history of ongoing post meridiem low-level fever and new onset progressive paralysis. On MRI (magnetic resonance imaging), an infiltrative enhancing lesion was noted, which initially resembled that of MS, but she reacted not sensitively with immunosuppressive therapy, we performed a brain biopsy to her, it turned out to be primary CNS (central nervous system) diffuse large B-cell lymphoma (DLBCL). And the morphology, the flow cytometric findings were consistent with germinal center B-like diffuse large B-cell lymphoma...
May 2017: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/29262721/bcl6-as-a-therapeutic-target-for-lymphoma
#19
Rebecca J Leeman-Neill, Govind Bhagat
B cell lymphoma 6 (BCL6) is a transcriptional repressor critical for the development and maintenance of germinal centers (GCs), which are required for generation of an effective humoral immune response. Genomic aberrations of BCL6, including mutations and translocations that occur during the GC reaction, as well as alterations of genes that regulate BCL6 expression, lead to sustained activity of BCL6, which promotes the development of GC-derived lymphomas. Since many types of B cell non-Hodgkin lymphomas (B-NHL) arise from neoplastic transformation of GC B cells and a high proportion harbor genetic lesions that deregulate BCL6 expression, inhibition of BCL6 has emerged as an attractive therapeutic strategy for lymphomas...
February 2018: Expert Opinion on Therapeutic Targets
https://www.readbyqxmd.com/read/29262531/mutational-profile-of-primary-breast-diffuse-large-b-cell-lymphoma
#20
Fernando Franco, Julia González-Rincón, Javier Lavernia, Juan F García, Paloma Martín, Carmen Bellas, Miguel A Piris, Lucia Pedrosa, José Miramón, José Gómez-Codina, Delvys Rodríguez-Abreu, Isidro Machado, Carmen Illueca, Jesús Alfaro, Mariano Provencio, Margarita Sánchez-Beato
Primary breast lymphoma is a rare form of extra-nodal lymphoid neoplasm. The most common histological type is the diffuse large B-cell lymphoma, which represents 60-80% of all the cases. Our study analyzes the mutational profile of the primary lymphoma of the breast through targeted massive sequencing with a panel of 38 genes in a group of 17 patients with primary breast diffuse large B-cell lymphoma. Seventy-point-five percent of the patients presented with stage IE and 29.5% with stage IIE. 44% of the cases correspond to lymphomas with germinal center phenotype and 33...
November 28, 2017: Oncotarget
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