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https://www.readbyqxmd.com/read/28730224/histopathological-and-immunohistochemical-profile-in-primary-sj%C3%A3-gren-s-syndrome
#1
Ştefan Cristian Dinescu, Mircea Cătălin ForŢofoiu, Ana Maria Bumbea, Paulina Lucia Ciurea, Cristina Jana Busuioc, Anca Emanuela Muşetescu
Sjögren's syndrome (SS) is an autoimmune disease characterized by hypofunction of the salivary and lachrymal glands. Main clinical features of SS are sicca symptoms, due to the altered glandular function. Also, in advanced stages, bilateral swelling of the parotid glands can be noted, indicative of severe glandular involvement. Phenotypic expression of various mononuclear cells present in the affected tissue offers additional insight into cellular proliferation, survival, migration, antibody secretion and also the potential of forming tertiary lymphoid tissue, i...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28729720/comparative-gene-expression-profiling-of-the-large-cell-variant-of-gastrointestinal-marginal-zone-b-cell-lymphoma
#2
Thomas F E Barth, Johann M Kraus, Ludwig Lausser, Lucia Flossbach, Lukas Schulte, Karlheinz Holzmann, Hans A Kestler, Peter Möller
Gastrointestinal (g.i.) large cell lymphoma is currently regarded as diffuse large B-cell lymphoma (DLBCL) despite a more favorable clinical outcome compared to other DLBCL. Cluster analyses on a transcriptome signature of NF-κB target genes of 30 g.i. marginal zone B-cell lymphomas (MZBL; 8 g.i. MZBL, 22 large cell MZBL - among them 9 with coexisting small cell component) and 6 DLBCL (3 activated B-cell like (ABC), 3 germinal center-like (GCB)) reveals a distinct pattern. The distinctiveness of large cell MZBL samples is further confirmed by a cohort of 270 available B-cell lymphoma and B-cell in silico profiles...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715816/distinct-dynamics-of-mitotic-transition-in-b-cell-lymphoma-and-reactive-b-cell-lymphoproliferations-determined-by-h3s10-phosphohistone-immunolabeling
#3
Gábor Méhes, Katalin Hegyi, Ravi Jobanputra, Lívia Beke, György Vereb, Judit Bedekovics
OBJECTIVES: Clonal selection in the follicular germinal centers in lymphatic tissues is accompanied by an intense proliferation of polyclonal B cells in a precisely regulated fashion. In contrast, B-cell neoplasias proliferate autonomously due to endogenous stimuli. The cell kinetic activity is obvious at many levels including progressive chromatin modification and elevated mitotic rates. We asked if there are differences in the kinetics of histone H3S10 phosphorylation required for mitotic entry between highly proliferating B cells of reactive germinal centers and in B-cell lymphomas with different proliferative capacity...
July 18, 2017: Pathobiology: Journal of Immunopathology, Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28714193/alteration-of-oxidative-phosphorylation-as-a-possible-mechanism-of-the-antifungal-action-of-p-coumaric-acid-against-botrytis-cinerea
#4
J Morales, L Mendoza, M Cotoras
AIMS: The aim of this study was to analyze the mechanism of action of p-coumaric acid against isolate B05.10 of B. cinerea. For this purpose, the effect of this compound on cell membrane, cell wall and oxidative phosphorylation was determined. Induction of oxidative stress triggered by this compound was also studied. METHODS AND RESULTS: p-coumaric acid showed antifungal effect on the mycelial growth-. Additionally, the compound was able to retard the germination of B...
July 17, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28713985/microarray-expression-profiles-of-long-non-coding-rnas-in-germinal-center-like-diffuse-large-b-cell-lymphoma
#5
Hong-Yu Gao, Bin Wu, Wei Yan, Zi-Mu Gong, Qi Sun, Hui-Han Wang, Wei Yang
Long non-coding RNAs (lncRNAs) are continuously transcribed and are involved in various cellular activities. However, their contributions to the occurrence and development of germinal center B-cell (GCB)-like diffuse large B-cell lymphoma (DLBCL) remain largely unknown. We applied microarray technology to profile the expression of lncRNAs in two different GCB-DLBCL cell lines (OCI-ly1 and OCI-ly19) and normal B lymphocytes. We demonstrated that 21,539 lncRNAs were expressed in all of the samples analyzed...
July 14, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28713371/regulation-of-subunit-specific-germinal-center-b-cell-responses-to-the-hiv-1-envelope-glycoproteins-by-antibody-mediated-feedback
#6
Mattias N E Forsell, Linda Kvastad, Saikiran K Sedimbi, John Andersson, Mikael C I Karlsson
The regulation of germinal center (GC) B cell responses to single epitopes is well investigated. How monoclonal B cells are regulated within the polyclonal B cell response to protein antigens is less so. Here, we investigate the primary GC B cell response after injection of mice with HIV-1 envelope glycoproteins. We demonstrate that single GCs are seeded by a diverse number of B cell clones shortly after a single immunization and that the presence of Env-specific antibodies can inhibit the development of early GC B cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28712455/the-properties-of-the-unique-age-associated-b-cell-subset-reveal-a-shift-in-strategy-of-immune-response-with-age
#7
Susan L Swain, Olivia Kugler-Umana, Yi Kuang, Wenliang Zhang
In aged mice, conventional naive B cells decrease and a new population of age-associated B cells (ABC)(3) develops. When aged unprimed mice are infected with influenza virus, there is a reduced generation of helper CD4 T cell subsets and germinal center B cells, leading to limited production of IgG Ab and less generation of conventional long-lived plasma cells, compared to young. However, we find an enhanced non-follicular (GL7(-)) ABC response that is helper T cell-independent, but requires high viral dose and pathogen recognition pathways...
July 11, 2017: Cellular Immunology
https://www.readbyqxmd.com/read/28707393/malaria-epstein-barr-virus-infection-and-the-pathogenesis-of-burkitt-s-lymphoma
#8
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/28704473/enriched-environment-and-stress-exposure-influence-splenic-b-lymphocyte-composition
#9
Blake T Gurfein, Burcu Hasdemir, Jeffrey M Milush, Chadi Touma, Rupert Palme, Douglas F Nixon, Nicholas Darcel, Frederick M Hecht, Aditi Bhargava
Prolonged chronic stress has deleterious effects on immune function and is associated with numerous negative health outcomes. The spleen harbors one-fourth of the body's lymphocytes and mediates both innate and adaptive immune responses. However, the subset of splenic lymphocytes that respond, either adaptively or maladaptively, to various stressors remains largely unknown. Here we investigated the effects of unpredictable chronic mild stress (CMS) exposure on spleen composition in male mice housed in two different caging conditions: standard caging (Cntl) and enriched environment (EE)...
2017: PloS One
https://www.readbyqxmd.com/read/28701402/increased-durable-b-cell-and-adcc-responses-associated-with-t-helper-responses-to-hiv-1-envelope-in-macaques-vaccinated-with-gp140-occluded-at-the-cd4-receptor-binding-site
#10
Willy M J M Bogers, Susan W Barnett, Herman Oostermeijer, Ivonne G Nieuwenhuis, Niels Beenhakker, Daniella Mortier, Petra Mooij, Gerrit Koopman, Edmund Remarque, Gregoire Martin, Rachel Pei-Jen Lai, Antu K Dey, Yide Sun, Brian Burke, Guido Ferrari, David Montefiori, Loic Martin, David Davis, Indresh Srivastava, Jonathan L Heeney
Strategies are needed to improve the immunogenicity of HIV-1 envelope (Env) antigens for more long lived, efficacious HIV-1 vaccine induced B-cell responses. HIV-1 Env gp140 (native or un-cleaved molecules) or gp120 monomeric proteins elicit relatively poor B-cell responses which are short-lived. We hypothesized that Env engagement of the CD4 receptor on T-helper cells may result in anergic effects on T-cell recruitment and consequently a lack of strong robust and durable B-memory responses. To test this hypothesis we occluded the CD4 binding site (CD4bs) of gp140 by stable cross-linking with a 3kD CD4 miniprotein mimetic serving to block ligation of gp140 on CD4+T-cells while preserving CD4 inducible (CDi) neutralizing and epitopes targeted by antibody dependent cellular cytotoxic (ADCC) effector responses...
July 12, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28700828/herbicidal-spectrum-absorption-and-transportation-and-physiological-effect-on-bidens-pilosa-of-the-natural-alkaloid-berberine
#11
Jiao Wu, Jing-Jing Ma, Bo Liu, Lun Huang, Xiao-Qing Sang, Li-Juan Zhou
Berberine is a natural herbicidal alkaloid from Coptis chinensis Franch. Here we characterized its herbicidal spectrum and absorption and transportation in the plant, along with the possible mechanism. Berberine showed no effect on the germination of the 10 tested plants. The IC50 values of berberine on the primary root length and fresh weight of the 10 tested plants ranged from 2.91 to 9.79 mg L(-1) and 5.76 to 35.07 mg L(-1), respectively. Berberine showed a similar herbicidal effect on Bidens pilosa as the commercial naturally derived herbicide cinmethylin...
July 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28700710/t-follicular-helper-cells-regulate-the-activation-of-b-lymphocytes-and-antibody-production-during-plasmodium-vivax-infection
#12
Maria Marta Figueiredo, Pedro Augusto Carvalho Costa, Suelen Queiroz Diniz, Priscilla Miranda Henriques, Flora Satiko Kano, Mauro Sugiro Tada, Dhelio Batista Pereira, Irene Silva Soares, Olindo Assis Martins-Filho, Dragana Jankovic, Ricardo Tostes Gazzinelli, Lis Ribeiro do Valle Antonelli
Although the importance of humoral immunity to malaria has been established, factors that control antibody production are poorly understood. Follicular helper T cells (Tfh cells) are pivotal for generating high-affinity, long-lived antibody responses. While it has been proposed that expansion of antigen-specific Tfh cells, interleukin (IL) 21 production and robust germinal center formation are associated with protection against malaria in mice, whether Tfh cells are found during Plasmodium vivax (P. vivax) infection and if they play a role during disease remains unknown...
July 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28700579/tfh-derived-dopamine-accelerates-productive-synapses-in-germinal-centres
#13
Ilenia Papa, David Saliba, Maurilio Ponzoni, Sonia Bustamante, Pablo F Canete, Paula Gonzalez-Figueroa, Hayley A McNamara, Salvatore Valvo, Michele Grimbaldeston, Rebecca A Sweet, Harpreet Vohra, Ian A Cockburn, Michael Meyer-Hermann, Michael L Dustin, Claudio Doglioni, Carola G Vinuesa
Protective high-affinity antibody responses depend on competitive selection of B cells carrying somatically mutated B-cell receptors by follicular helper T (TFH) cells in germinal centres. The rapid T-B-cell interactions that occur during this process are reminiscent of neural synaptic transmission pathways. Here we show that a proportion of human TFH cells contain dense-core granules marked by chromogranin B, which are normally found in neuronal presynaptic terminals storing catecholamines such as dopamine...
July 12, 2017: Nature
https://www.readbyqxmd.com/read/28698369/a-distinct-subpopulation-of-cd25-t-follicular-regulatory-cells-localizes-in-the-germinal-centers
#14
James Badger Wing, Yohko Kitagawa, Michela Locci, Hannah Hume, Christopher Tay, Takayoshi Morita, Yujiro Kidani, Kyoko Matsuda, Takeshi Inoue, Tomohiro Kurosaki, Shane Crotty, Cevayir Coban, Naganari Ohkura, Shimon Sakaguchi
T-follicular helper (Tfh) cells differentiate through a multistep process, culminating in germinal center (GC) localized GC-Tfh cells that provide support to GC-B cells. T-follicular regulatory (Tfr) cells have critical roles in the control of Tfh cells and GC formation. Although Tfh-cell differentiation is inhibited by IL-2, regulatory T (Treg) cell differentiation and survival depend on it. Here, we describe a CD25(-) subpopulation within both murine and human PD1(+)CXCR5(+)Foxp3(+) Tfr cells. It is preferentially located in the GC and can be clearly differentiated from CD25(+) non-GC-Tfr, Tfh, and effector Treg (eTreg) cells by the expression of a wide range of molecules...
July 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28697670/germination-of-spores-of-the-orders-bacillales-and-clostridiales
#15
Peter Setlow, Shiwei Wang, Yong-Qing Li
Dormant Bacillales and Clostridiales spores begin to grow when small molecules (germinants) trigger germination, potentially leading to food spoilage or disease. Germination-specific proteins sense germinants, transport small molecules, and hydrolyze specific bonds in cortex peptidoglycan and specific proteins. Major events in germination include (a) germinant sensing; (b) commitment to germinate; (c) release of spores' depot of dipicolinic acid (DPA); (d) hydrolysis of spores' peptidoglycan cortex; and (e) spore core swelling and water uptake, cell wall peptidoglycan remodeling, and restoration of core protein and inner spore membrane lipid mobility...
July 11, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28695963/differential-regulation-of-cumulus-cell-transcription-during-oocyte-maturation-in-vivo-and-in-vitro
#16
Giovanni Coticchio, Libby Ophir, Yuval Yung, Micha Baum, Mariabeatrice Dal Canto, Mario Mignini-Renzini, Fausta Brambillasca, Rubens Fadini, Ariel Hourvitz
Differences in cumulus cell gene expression after oocyte maturation in vitro (IVM) or in vivo have been described in previous studies. However, the possible impact of follicle stage on gene expression deregulation during human oocyte IVM remains unknown. Expression of selected genes of interest was compared in cumulus cell of three classes of human cumulus cell-oocyte complexes (COCs): a) COCs derived from human chorionic gonadotropin (hCG)-triggered IVM cycles, collected at the germinal vesicle (GV) stage from mid-sized follicles (4-12 mm) and matured in vitro (IVM-GV); b) COCs derived from hCG-triggered IVM cycles, collected from mid-sized follicles (4-12 mm) and matured in vivo (IVM-MII); c) COCs derived from controlled ovarian stimulation in vitro fertilization (IVF) cycles, collected from large/preovulatory follicles and matured in vivo (IVF-MII)...
2017: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/28692537/early-initiation-of-antiretroviral-treatment-post-siv-infection-does-not-resolve-lymphoid-tissue-activation
#17
Jung Joo Hong, Eduardo L V Silveira, Praveen K Amancha, Siddappa N Byrareddy, Sanjeev Gumber, Kyu-Tae Chang, Aftab A Ansari, Francois Villinger
OBJECTIVE: Germinal center (GC) resident follicular helper T (TFH) cells in lymphoid follicles are a potential sanctuary for HIV/SIV replication. But the dynamics of GCs upon early initiation of antiretroviral therapy (ART) and their potential role in the formation of viral sanctuaries post SIV infection are not fully understood. DESIGN: Sequential lymph node biopsies (n = 10) were collected from SIVmac239-infected rhesus macaques before infection, at 5 weeks post infection/pre ART, 6 and 12 weeks following ART initiation...
July 7, 2017: AIDS
https://www.readbyqxmd.com/read/28690949/role-of-sex-hormone-levels-and-psychological-stress-in-the-pathogenesis-of-autoimmune-diseases
#18
REVIEW
Salman Assad, Hamza H Khan, Haider Ghazanfar, Zarak H Khan, Salman Mansoor, Muhammad A Rahman, Ghulam H Khan, Bilal Zafar, Usman Tariq, Shuja A Malik
The aim of this review article is to assess the connection between psychological stress and sex hormones and their effect on the development of autoimmune diseases. Psychological stress describes what people feel when they are under mental, physical, or emotional pressure. We searched for online articles using MEDLINE®, Embase, Cochrane Library and Google Scholar. Our research yielded a total of 165 articles out of which 30 articles were considered for further perusal. The articles were reviewed from February 2016 to February 2017...
June 5, 2017: Curēus
https://www.readbyqxmd.com/read/28690850/agammaglobulinaemia-despite-terminal-b-cell-differentiation-in-a-patient-with-a-novel-lrba-mutation
#19
Nashat Al Sukaiti, Khwater AbdelRahman, Jalila AlShekaili, Sumaya Al Oraimi, Aisha Al Sinani, Nasser Al Rahbi, Vicky Cho, Matt Field, Matthew C Cook
Mutations in lipopolysaccharide-responsive vesicle trafficking, beach and anchor-containing protein (LRBA) cause immune deficiency and inflammation. Here, we are reporting a novel homozygous mutation in LRBA allele in 7-year-old Omani boy, born to consanguineous parents. He presented with type 1 diabetes, autoimmune haematological cytopenia, recurrent chest infections and lymphocytic interstitial lung disease. The patient was treated with CTLA4-Ig (abatacept) with good outcome every 2 weeks for a period of 3 months...
May 2017: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/28690525/primary-type3-non-abc-non-gcb-subtype-of-extranodal-diffuse-large-b-cell-lymphoma-of-the-thyroid-bearing-no-myd88-mutation-by-padlock-probe-hybridization
#20
Yukiko Nishi, Riko Kitazawa, Ryuma Haraguchi, Ayaka Ouchi, Yasuo Ueda, Yuri Kamaoka, Ken Yamamoto, Yasuhiko Todo, Hiroaki Miyaoka, Sohei Kitazawa
Primary extranodal malignant lymphoma of the thyroid is a rare entity composed of mostly neoplastic transformation of germinal center-like B cells (GCB) or memory B cells. Other B-cell-type malignancies arising primarily in the thyroid have rarely been described. Immunohistochemical examination of autopsied primary malignant lymphoma of the thyroid in an 83-year-old Japanese female revealed the presence of a non-GCB subtype of diffuse large B-cell lymphoma (DLBCL) without the typical codon 206 or 265 missense mutation of MYD88...
May 2017: Case Reports in Oncology
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