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Blimp1 autoimmunity

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https://www.readbyqxmd.com/read/27746783/anti-lipid-igg-antibodies-are-produced-via-germinal-centers-in-a-murine-model-resembling-human-lupus
#1
Carlos Wong-Baeza, Albany Reséndiz-Mora, Luis Donis-Maturano, Isabel Wong-Baeza, Luz Zárate-Neira, Juan Carlos Yam-Puc, Juana Calderón-Amador, Yolanda Medina, Carlos Wong, Isabel Baeza, Leopoldo Flores-Romo
Anti-lipid IgG antibodies are produced in some mycobacterial infections and in certain autoimmune diseases [such as anti-phospholipid syndrome, systemic lupus erythematosus (SLE)]. However, few studies have addressed the B cell responses underlying the production of these immunoglobulins. Anti-lipid IgG antibodies are consistently found in a murine model resembling human lupus induced by chlorpromazine-stabilized non-bilayer phospholipid arrangements (NPA). NPA are transitory lipid associations found in the membranes of most cells; when NPA are stabilized they can become immunogenic and induce specific IgG antibodies, which appear to be involved in the development of the mouse model of lupus...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27478306/the-expression-of-t-cell-foxp3-and-t-bet-is-upregulated-in-severe-but-not-euthyroid-hashimoto-s-thyroiditis
#2
Stana Tokić, Mario Štefanić, Ljubica Glavaš-Obrovac, Sonja Jaman, Eva Novosadová, Jana Petrkova, Zdenka Navratilova, Mirjana Suver Stević, Martin Petrek
Hashimoto's thyroiditis (HT) is an organ-specific autoimmune disorder characterized by progressive thyroid failure. Th1 and Treg subset of CD4(+) cells have been implicated in the pathogenesis; however, less is known about their respective roles across the spectrum of HT clinical presentations. To shed more light on CD4(+) subsets role in HT, we investigated the mRNA expression levels of several Th1/Treg-associated transcription factors (T-bet/ETS1, HIF1α/BLIMP1/FOXP3) in peripheral blood T cells of 10 hypothyroid, untreated HT patients, 10 hypothyroid patients undergoing hormone replacement therapy, 12 euthyroid HT subjects, and 11 healthy controls by the qRT-PCR...
2016: Mediators of Inflammation
https://www.readbyqxmd.com/read/27436361/rock2-signaling-is-required-to-induce-a-subset-of-t-follicular-helper-cells-through-opposing-effects-on-stats-in-autoimmune-settings
#3
Jonathan M Weiss, Wei Chen, Melanie S Nyuydzefe, Alissa Trzeciak, Ryan Flynn, James R Tonra, Suzana Marusic, Bruce R Blazar, Samuel D Waksal, Alexandra Zanin-Zhorov
Rho-associated kinase 2 (ROCK2) determines the balance between human T helper 17 (TH17) cells and regulatory T (Treg) cells. We investigated its role in the generation of T follicular helper (TFH) cells, which help to generate antibody-producing B cells under normal and autoimmune conditions. Inhibiting ROCK2 in normal human T cells or peripheral blood mononuclear cells from patients with active systemic lupus erythematosus (SLE) decreased the number and function of TFH cells induced by activation ex vivo. Moreover, inhibition of ROCK2 activity decreased the abundance of the transcriptional regulator Bcl6 (B cell lymphoma 6) and increased that of Blimp1 by reducing the binding of signal transducer and activator of transcription 3 (STAT3) and increasing that of STAT5 to the promoters of the genes Bcl6 and PRDM1, respectively...
2016: Science Signaling
https://www.readbyqxmd.com/read/26544714/irf4-dependent-and-irf4-independent-pathways-contribute-to-dc-dysfunction-in-lupus
#4
Michela Manni, Sanjay Gupta, Briana G Nixon, Casey T Weaver, Rolf Jessberger, Alessandra B Pernis
Interferon Regulatory Factors (IRFs) play fundamental roles in dendritic cell (DC) differentiation and function. In particular, IRFs are critical transducers of TLR signaling and dysregulation in this family of factors is associated with the development of autoimmune disorders such as Systemic Lupus Erythematosus (SLE). While several IRFs are expressed in DCs their relative contribution to the aberrant phenotypic and functional characteristics that DCs acquire in autoimmune disease has not been fully delineated...
2015: PloS One
https://www.readbyqxmd.com/read/25484301/interleukin-10-producing-plasmablasts-exert-regulatory-function-in-autoimmune-inflammation
#5
Masanori Matsumoto, Akemi Baba, Takafumi Yokota, Hiroyoshi Nishikawa, Yasuyuki Ohkawa, Hisako Kayama, Axel Kallies, Stephen L Nutt, Shimon Sakaguchi, Kiyoshi Takeda, Tomohiro Kurosaki, Yoshihiro Baba
B cells can suppress autoimmunity by secreting interleukin-10 (IL-10). Although subpopulations of splenic B lineage cells are reported to express IL-10 in vitro, the identity of IL-10-producing B cells with regulatory function in vivo remains unknown. By using IL-10 reporter mice, we found that plasmablasts in the draining lymph nodes (dLNs), but not splenic B lineage cells, predominantly expressed IL-10 during experimental autoimmune encephalomyelitis (EAE). These plasmablasts were generated only during EAE inflammation...
December 18, 2014: Immunity
https://www.readbyqxmd.com/read/25447400/treatment-of-il-21r-fc-control-autoimmune-arthritis-via-suppression-of-stat3-signal-pathway-mediated-regulation-of-the-th17-treg-balance-and-plasma-b-cells
#6
Jun-Geol Ryu, Jennifer Lee, Eun-Kyung Kim, Hyeon-Beom Seo, Jin-Sil Park, Seon-Yeong Lee, Young-Mee Moon, Seok-Ho Yoo, Young-woo Park, Sung-Hwan Park, Mi-La Cho, Ho-Youn Kim
Interleukin-21 (IL-21) is a T cell-derived cytokine modulating T cell, B cell, and natural killer cell responses. To determine whether IL-21 contributes to pathologic processes, recombinant IL-21 receptor (R) fusion protein (rhIL-21R-Fc) was examined in mice models of autoimmune arthritis (collagen-induced arthritis). DBA/1J mice were immunized with chicken type II collagen and then treated intraperitoneally with rhIL-21R-Fc, which was initiated after the onset of arthritis symptoms in 20% of the cohort. The mice were assessed 3 times per week for signs of arthritis and histologic features as well as serum immunoglobulin...
February 2015: Immunology Letters
https://www.readbyqxmd.com/read/25366967/hrd1-mediated-blimp-1-ubiquitination-promotes-dendritic-cell-mhcii-expression-for-cd4-t-cell-priming-during-inflammation
#7
Heeyoung Yang, Quan Qiu, Beixue Gao, Sinyi Kong, Zhenghong Lin, Deyu Fang
The ubiquitin pathway plays critical roles in antigen presentation. However, the ubiquitin ligases that regulate MHC gene transcription remain unidentified. We showed that the ubiquitin ligase Hrd1, expression of which is induced by Toll-like receptor (TLR) stimulation, is required for MHC-II but not MHC-I transcription in dendritic cells (DCs). Targeted Hrd1 gene deletion in DCs diminished MHC-II expression. As a consequence, Hrd1-null DCs failed to prime CD4(+) T cells without affecting the activation of CD8(+) T cells...
November 17, 2014: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/25087995/ursolic-acid-ameliorates-autoimmune-arthritis-via-suppression-of-th17-and-b-cell-differentiation
#8
Seung-ye Baek, Jaeseon Lee, Dong-gun Lee, Mi-kyung Park, Jennifer Lee, Seung-ki Kwok, Mi-la Cho, Sung-hwan Park
AIM: Ursolic acid (UA) is a pentacyclic triterpenoid found in most plant species, which has been shown anti-inflammatory and anti-oxidative activities. In this study, we examined the effects of UA on collagen-induced arthritis (CIA) in mice, and to identify the mechanisms underlying the effects. METHODS: CIA was induced in mice. Two weeks later, the mice were treated with UA (150 mg/kg, ip, 3 times per week) for 4 weeks. The expression of cytokines and oxidative stress markers in joint tissues was measured with immunohistochemistry...
September 2014: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/24796719/il-27-and-il-12-oppose-pro-inflammatory-il-23-in-cd4-t-cells-by-inducing-blimp1
#9
Christina Heinemann, Sylvia Heink, Franziska Petermann, Ajithkumar Vasanthakumar, Veit Rothhammer, Elien Doorduijn, Meike Mitsdoerffer, Christopher Sie, Olivia Prazeres da Costa, Thorsten Buch, Bernhard Hemmer, Mohamed Oukka, Axel Kallies, Thomas Korn
Central nervous system (CNS) autoimmunity is regulated by the balance of pro-inflammatory cytokines and IL-10. Here we identify the transcriptional regulator Blimp1 as crucial to induce IL-10 in inflammatory T helper cells. Pre-committed Th17 cells respond to IL-27 and IL-12 by upregulating Blimp1 and adopt a Tr-1-like phenotype characterized by IL-10 and IFN-γ production. Accordingly, Blimp1-deficient effector T cells fail to produce IL-10, and deficiency in Tr-1 cell function leads to uncontrolled Th17 cell-driven CNS pathology without the need to stabilize the Th17 phenotype with IL-23...
2014: Nature Communications
https://www.readbyqxmd.com/read/24572363/il-35-producing-b-cells-are-critical-regulators-of-immunity-during-autoimmune-and-infectious-diseases
#10
Ping Shen, Toralf Roch, Vicky Lampropoulou, Richard A O'Connor, Ulrik Stervbo, Ellen Hilgenberg, Stefanie Ries, Van Duc Dang, Yarúa Jaimes, Capucine Daridon, Rui Li, Luc Jouneau, Pierre Boudinot, Siska Wilantri, Imme Sakwa, Yusei Miyazaki, Melanie D Leech, Rhoanne C McPherson, Stefan Wirtz, Markus Neurath, Kai Hoehlig, Edgar Meinl, Andreas Grützkau, Joachim R Grün, Katharina Horn, Anja A Kühl, Thomas Dörner, Amit Bar-Or, Stefan H E Kaufmann, Stephen M Anderton, Simon Fillatreau
B lymphocytes have critical roles as positive and negative regulators of immunity. Their inhibitory function has been associated primarily with interleukin 10 (IL-10) because B-cell-derived IL-10 can protect against autoimmune disease and increase susceptibility to pathogens. Here we identify IL-35-producing B cells as key players in the negative regulation of immunity. Mice in which only B cells did not express IL-35 lost their ability to recover from the T-cell-mediated demyelinating autoimmune disease experimental autoimmune encephalomyelitis (EAE)...
March 20, 2014: Nature
https://www.readbyqxmd.com/read/23857366/fcrl3-promotes-tlr9-induced-b-cell-activation-and-suppresses-plasma-cell-differentiation
#11
Fu Jun Li, Daniel M Schreeder, Ran Li, Jiongru Wu, Randall S Davis
Fc receptor-like (FCRL) molecules are preferentially expressed by B lymphocytes and possess tyrosine-based immunoregulatory function. Although they generally inhibit B-cell receptor signaling, their influence on other activation pathways remains largely unexplored. In humans, FCRL3 encodes a type I transmembrane protein harboring both cytoplasmic ITAM and ITIM elements that can repress B-cell receptor activation. Despite this inhibitory property, mounting associations for FCRL3 with autoimmune and lympho-proliferative disorders imply a role for it in promoting B-cell pathogenesis...
November 2013: European Journal of Immunology
https://www.readbyqxmd.com/read/23052053/b-lymphocyte-induced-maturation-protein-1-blimp-1-attenuates-autoimmune-diabetes-in-nod-mice-by-suppressing-th1-and-th17-cells
#12
M-H Lin, F-C Chou, L-T Yeh, S-H Fu, H-Y C Chiou, K-I Lin, D-M Chang, H-K Sytwu
AIMS/HYPOTHESIS: Recent reports indicate that B lymphocyte-induced maturation protein 1 (BLIMP-1), encoded by the Prdm1 gene, expands its control over T cells and is associated with susceptibility to colitis in mice with T cell-specific BLIMP-1 deficiency. In this study, we aimed to investigate the potential role of BLIMP-1 in regulating autoimmune diabetes and T helper type 17 (Th17) cells. METHODS: We generated T cell-specific Blimp1 (also known as Prdm1) transgenic (Tg) or conditional knockout (CKO) NOD mice, in which Blimp1 is overexpressed or deleted in T cells, respectively...
January 2013: Diabetologia
https://www.readbyqxmd.com/read/22198952/regulatory-b10-cells-differentiate-into-antibody-secreting-cells-after-transient-il-10-production-in-vivo
#13
Damian Maseda, Susan H Smith, David J DiLillo, Jacquelyn M Bryant, Kathleen M Candando, Casey T Weaver, Thomas F Tedder
Regulatory B cells that are functionally defined by their capacity to express IL-10 (B10 cells) downregulate inflammation and autoimmunity. In studies using well-defined IL-10 reporter mice, this rare B10 cell subset was also found to maintain a capacity for plasma cell differentiation. During a transient period of il10 transcription, the blimp1 and irf4 transcription factors were induced in B10 cells, whereas pax5 and bcl6 were downregulated as a significant fraction of B10 cells completed the genetic and phenotypic program leading to Ab-secreting cell differentiation in vitro and in vivo...
February 1, 2012: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/21886837/b-cell-signature-during-inactive-systemic-lupus-is-heterogeneous-toward-a-biological-dissection-of-lupus
#14
Jean-Claude Garaud, Jean-Nicolas Schickel, Gilles Blaison, Anne-Marie Knapp, Doulaye Dembele, Julie Ruer-Laventie, Anne-Sophie Korganow, Thierry Martin, Pauline Soulas-Sprauel, Jean-Louis Pasquali
Systemic lupus erythematosous (SLE) is an autoimmune disease with an important clinical and biological heterogeneity. B lymphocytes appear central to the development of SLE which is characterized by the production of a large variety of autoantibodies and hypergammaglobulinemia. In mice, immature B cells from spontaneous lupus prone animals are able to produce autoantibodies when transferred into immunodeficient mice, strongly suggesting the existence of intrinsic B cell defects during lupus. In order to approach these defects in humans, we compared the peripheral B cell transcriptomas of quiescent lupus patients to normal B cell transcriptomas...
2011: PloS One
https://www.readbyqxmd.com/read/21664492/cholecystokinin-octapeptide-inhibits-immunoglobulin-g1-production-of-lipopolysaccharide-activated-b-cells
#15
Jing-Ge Zhang, Bin Cong, Xian-Xian Jia, Hui Li, Qiao-Xia Li, Chun-Ling Ma, Yu Feng
Cholecystokinin octapeptide (CCK-8) is a typical brain-gut peptide that exerts a variety of physiological actions in both the peripheral and central nervous systems. Our laboratory has previously reported that CCK-8 produces immunoregulatory action through activating CCK receptor (CCK1R/CCK2R) expression on immune cell surfaces. In the present study, we investigated the effect of CCK-8 on immunoglobulin G1 (IgG1) production in lipopolysaccharide (LPS)-activated B cells in vitro. CCK-8 inhibited the proliferation and IgG1 mRNA expression of LPS-activated B cells and therefore inhibited IgG1 production...
November 2011: International Immunopharmacology
https://www.readbyqxmd.com/read/20547828/homeostatic-expansion-of-autoreactive-immunoglobulin-secreting-cells-in-the-rag2-mouse-model-of-omenn-syndrome
#16
Barbara Cassani, Pietro Luigi Poliani, Veronica Marrella, Francesca Schena, Aisha V Sauer, Maria Ravanini, Dario Strina, Christian E Busse, Stephan Regenass, Hedda Wardemann, Alberto Martini, Fabio Facchetti, Mirjam van der Burg, Antonius G Rolink, Paolo Vezzoni, Fabio Grassi, Elisabetta Traggiai, Anna Villa
Hypomorphic RAG mutations, leading to limited V(D)J rearrangements, cause Omenn syndrome (OS), a peculiar severe combined immunodeficiency associated with autoimmune-like manifestations. Whether B cells play a role in OS pathogenesis is so far unexplored. Here we report the detection of plasma cells in lymphoid organs of OS patients, in which circulating B cells are undetectable. Hypomorphic Rag2(R229Q) knock-in mice, which recapitulate OS, revealed, beyond severe B cell developmental arrest, a normal or even enlarged compartment of immunoglobulin-secreting cells (ISC)...
July 5, 2010: Journal of Experimental Medicine
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