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Autoimmunity

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https://www.readbyqxmd.com/read/29733234/glycosylation-of-random-igg-distinguishes-seropositive-and-seronegative-rheumatoid-arthritis
#1
I Magorivska, B Döncző, T Dumych, A Karmash, M Boichuk, K Hychka, M Mihalj, M Szabó, E Csánky, J Rech, A Guttman, S G Vari, R Bilyy
The N-glycosylation of human immunoglobulins, especially IgGs, plays a critical role in determining affinity of IgGs towards their effector (pro- and anti-inflammatory) receptors. However, it is still not clear whether altered glycosylation is involved in only antibody-dependent disorders like seropositive rheumatoid arthritis (RA) or also in pathologies with similar clinical manifestations, but no specific autoantibodies like seronegative RA. The clarification of that uncertainty was the aim of the current study...
May 7, 2018: Autoimmunity
https://www.readbyqxmd.com/read/29732925/new-genetically-engineered-dfs70-knock-out-hep-2-cells-enable-rapid-and-specific-recognition-of-anti-dfs70-antibodies
#2
Nicola Bizzaro, Martina Fabris
BACKGROUND: The correct identification of anti-dense fine speckled-70 (DFS70) antibodies represents an important issue in the detection of anti-nuclear antibodies (ANAs) as performed by the indirect immunofluorescence (IIF) test on HEp-2 substrates. In this study, we have evaluated a new method for anti-DFS70 antibody detection employing HEp-2 cells knocked-out for the DFS70 antigen. METHODS: We studied 148 sera with a DFS70-like pattern (91 positive and 57 negative when tested for anti-DFS70 antibodies by a specific chemoluminescence [CLIA] method); 116 sera with infectious disease; 100 healthy donors (HDs), 139 samples from patients with a defined diagnosis of autoimmune rheumatic disease (ARD), and 242 consecutive unselected samples screened for ANA during the routine work-up...
May 6, 2018: Autoimmunity
https://www.readbyqxmd.com/read/29718713/correction-to-abd-elhalem-et-al-bone-marrow-mesenchymal-stem-cells-suppress-il-9-in-adjuvant-induced-arthritis
#3
(no author information available yet)
No abstract text is available yet for this article.
May 2, 2018: Autoimmunity
https://www.readbyqxmd.com/read/29583030/samhd1-recurring-roles-in-cell-cycle-viral-restriction-cancer-and-innate-immunity
#4
Christopher H Mauney, Thomas Hollis
Sterile alpha motif and histidine-aspartic acid domain-containing protein 1 (SAMHD1) is a deoxynucleotide triphosphate (dNTP) hydrolase that plays an important role in the homeostatic balance of cellular dNTPs. Its emerging role as an effector of innate immunity is affirmed by mutations in the SAMHD1 gene that cause the severe autoimmune disease, Aicardi-Goutieres syndrome (AGS) and that are linked to cancer. Additionally, SAMHD1 functions as a restriction factor for retroviruses, such as HIV. Here, we review the current biochemical and biological properties of the enzyme including its structure, activity, and regulation by post-translational modifications in the context of its cellular function...
March 27, 2018: Autoimmunity
https://www.readbyqxmd.com/read/29569949/altered-expression-of-transcription-factors-irf4-and-irf8-in-peripheral-blood-b-cells-is-associated-with-clinical-severity-and-circulating-plasma-cells-frequency-in-patients-with-myasthenia-gravis
#5
Yong Zhang, Xiao Jia, Yan Xia, Hao Li, Fei Chen, Jie Zhu, Xiuying Zhang, Yanyan Zhang, YuZhong Wang, Yanan Xu, Meng Pan, Xiaoyu Huang, Tingyan Yu, Linlin Fu, Chenghua Xiao, Deqin Geng
Previous studies have shown that interferon regulatory factor-4 (IRF4) and IRF8 play critical but distinct roles in the differentiation of B cells into plasma cells (PCs). In the present study, we aimed to measure the expression levels of IRF4 and IRF8 in B cells from patients with myasthenia gravis (MG) and to investigate whether the expression of IRF4 and IRF8 associates with pathogenesis of MG. A total of 35 anti-acetylcholine receptor (AChR) antibody (Ab)-positive patients with MG [20 generalized MG (GMG) and 15 ocular MG (OMG) and 25 healthy donors were recruited in this study...
March 23, 2018: Autoimmunity
https://www.readbyqxmd.com/read/29526119/methylation-levels-of-the-tnfa-gene-are-different-between-graves-and-hashimoto-s-diseases-and-influenced-by-the-tnfa-polymorphism
#6
Emi Morita, Mikio Watanabe, Naoya Inoue, Hidemi Hashimoto, Emi Haga, Yoh Hidaka, Yoshinori Iwatani
Graves' disease (GD) and Hashimoto's disease (HD) are different pathological types of autoimmune thyroid diseases (AITDs). However, the epigenetic differences between these diseases have not been elucidated. DNA methylation is one of the primary epigenetic modifications that reflect environmental influences on gene expression. In this study, we evaluated the methylation status of six CpG sites in the TNFA promoter using pyrosequencing and analyzed the data in combination with functional polymorphisms (-1031 T/C and +123 C/T) in the TNFA gene to clarify the role of gene methylation on the prognosis of AITDs...
May 2018: Autoimmunity
https://www.readbyqxmd.com/read/29504848/signalling-pathways-identified-in-salivary-glands-from-primary-sj%C3%A3-gren-s-syndrome-patients-reveal-enhanced-adipose-tissue-development
#7
Lara A Aqrawi, Janicke Liaaen Jensen, Gunnvor Øijordsbakken, Ann-Kristin Ruus, Ståle Nygård, Marit Holden, Roland Jonsson, Hilde Kanli Galtung, Kathrine Skarstein
A characteristic feature of primary Sjögren's syndrome (pSS) is the destruction of salivary and lacrimal glands mediated by mononuclear cell infiltration. Adipocytes can also occupy a large portion of the salivary gland (SG) tissue area, although little is known about their significance in pSS. We have previously investigated adipose tissue infiltration in SG biopsies from pSS patients and non-SS sicca controls. Our findings indicated the distinct incidence of adipose tissue replacement in pSS patients, where adipocytes were detected in interleukin (IL) 6 rich regions...
May 2018: Autoimmunity
https://www.readbyqxmd.com/read/29480020/protective-effects-of-quercetin-treatment-in-a-pristane-induced-mouse-model-of-lupus-nephritis
#8
Mariane Dos Santos, Priscila Tamar Poletti, Gaia Favero, Alessandra Stacchiotti, Francesca Bonomini, Carolina Caruccio Montanari, Silvia Regina Bona, Norma Possa Marroni, Rita Rezzani, Francisco Veríssimo Veronese
INTRODUCTION: Lupus nephritis (LN) is one of the most severe complications of systemic lupus erythematosus. As murine models of LN are valuable tools to better understand its pathophysiology and to search for new effective treatments, we investigated the effects of the bioflavonoid quercetin on pristane-induced LN mice through histomorphological analyses. METHODS: Immunofluorescence and biochemical assays were used to evaluate the expression of markers of inflammation (interleukin-6, IL-6; tumour necrosis factor-α, TNF-α), oxidative stress (catalase, CAT; superoxide dismutase 1, SOD1; thiobarbituric acid reactive substances, TBARS), apoptosis (Bax), and fibrosis (transforming growth factor-β1, TGF-β1)...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29475367/mir-148b-3p-affects-the-pathogenesis-of-adjuvant-induced-arthritis-rats-through-the-direct-target-dnmt1
#9
Chenggui Miao, Hao Yu, Jun Chang, Guoxue Zhang, Guoliang Zhou, Chuanlei Zhao
Our previous study showed that up-regulated DNA methyltransferase-1 (DNMT1) played an important role in the hypermethylation modification of SFRP4 in adjuvant-induced arthritis (AIA) rats. This work focused on the role of disordered miR-148b-3p in RA pathology and its corresponding regulatory targets. The expression of miR-148b-3p and DNMT1, and the effect of miR-148b-3p on the DNMT1 expression were determined by real-time qPCR, western blotting and double luciferase reporter genes. The role of miR-148b-3p on the SFRP4 expression, the canonical Wnt signaling and the pathology of AIA rats was investigated using real-time qPCR, western blotting and methylation-specific PCR (MSP)...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29471675/alterations-in-nucleotide-binding-oligomerization-domain-2-expression-pathway-activation-and-cytokine-production-in-yao-syndrome
#10
Christine McDonald, Min Shen, Erin E Johnson, Amrita Kabi, Qingping Yao
Yao syndrome (YAOS) is a systemic autoinflammatory disease (SAID), formerly termed nucleotide-binding oligomerization domain-2 (NOD2)-associated autoinflammatory disease. Due to the recent identification of YAOS, the molecular mechanisms underlying its disease pathogenesis are unclear. With specific NOD2 variants as characteristic genotypic features of YAOS, our study examined NOD2 expression, transcript splicing, signaling pathway activation, and cytokine profiles in peripheral blood mononuclear cells (PBMCs) from 10 YAOS patients and six healthy individuals...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29463118/clinical-contribution-of-myositis-related-antibodies-detected-by-immunoblot-to-idiopathic-inflammatory-myositis-a-one-year-retrospective-study
#11
Marie Lecouffe-Desprets, Caroline Hémont, Antoine Néel, Claire Toquet, Agathe Masseau, Mohamed Hamidou, Regis Josien, Jérôme C Martin
In this study, we aimed at evaluating the contribution of an extended myositis-related antibodies (Abs) determination by immunoblot to the diagnosis, classification, and prognosis of idiopathic inflammatory myositis (IIM). Medical records of all the patients (n = 237) with myositis-related Ab requests addressed to our department over a one-year period were retrospectively analyzed. Patients were classified as IIM, auto-immune disease (AID) other than IIM, and other diagnosis, and examined for their Ab profiles as determined by immunoblot...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29372654/functional-tsh-receptor-antibodies-in-children-with-autoimmune-thyroid-diseases
#12
Karolina Stożek, Artur Bossowski, Katarzyna Ziora, Anna Bossowska, Małgorzata Mrugacz, Anna Noczyńska, Mieczysław Walczak, Elżbieta Petriczko, Beata Pyrżak, Anna Kucharska, Mieczysław Szalecki, Tanja Diana, George J Kahaly
INTRODUCTION: The diagnostic value of the level of TSH receptor antibodies (TSHR-Ab) in the population of children with autoimmune thyroid diseases (AITDs) is still unknown. The aim of this cross-sectional study was to investigate the prevalence of TSHR-Ab in a paediatric cohort with AITD and healthy controls. MATERIALS AND METHODS: A total of 240 serum samples were obtained from 205 patients with AITD, type 1 diabetes (T1D), juvenile arthritis (JA), and healthy controls (C)...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29350070/celiac-antibodies-in-children-with-type-1-diabetes-a-diagnostic-validation-study
#13
Katarzyna Lewandowska, Olga Ciepiela, Agnieszka Szypowska, Jan Wyhowski, Eliza Głodkowska-Mrówka, Katarzyna Popko, Magdalena Ostafin, Beata Pyrżak, Urszula Demkow
INTRODUCTION: Autoimmune diseases, such as celiac disease (CD) and diabetes mellitus type 1, tend to co-occur within the same patient. The prevalence of CD in diabetic children is higher than in the general population, and is estimated to be 0.6-16.4%. The diagnosis of CD is based on histopathological examination and serological testing, however, these methods are still imperfect and new diagnostic algorithms should be considered. AIM: The aim of the study was to assess the diagnostic value of serological tests detecting antibodies against deamidated gliadin peptide, endomysium, tissue transglutaminase, neo-epitope tissue transglutaminase and to identify HLA-related genetic predisposition to CD in patients with type 1 diabetes mellitus (DM1)...
March 2018: Autoimmunity
https://www.readbyqxmd.com/read/29359591/bone-marrow-mesenchymal-stem-cells-suppress-il-9-in-adjuvant-induced-arthritis
#14
Sahar Sobhy Abd Elhalem, Nawal Zakaria Haggag, Nashwa Ahmed El-Shinnawy
Interleukin-9 (IL-9) has been shown to be upregulated in rheumatoid arthritis (RA). The exact role of IL-9 has not yet been effectively studied. Mesenchymal stem cells (MSCs) have shown a promising immunomodulatory role towards repairing cartilage and restoring joint function. One of the key problems influencing the therapeutic efficacy of stem cell therapy is the poor cell survival following transplantation. This is attributed to oxidative and inflammatory stresses at the injured sites. Hesperidin (Hsd), a flavanone present in citrus fruits, has been studied as potential therapeutic agents that have anti-oxidant and anti-inflammatory activities...
February 2018: Autoimmunity
https://www.readbyqxmd.com/read/29308663/gain-of-function-mutant-of-complement-factor-b-k323e-mimics-pathogenic-c3nef-autoantibodies-in-convertase-assays
#15
Aleksandra Urban, Anna Borowska, Anna Felberg, Lambertus van den Heuvel, Grzegorz Stasiłojć, Elena Volokhina, Marcin Okrój
Complement convertases are enzymatic complexes, which play a critical role in propagation and amplification of the complement cascade. Under physiological conditions, convertases decay shortly after being formed in either spontaneous or inhibitor-driven process. Prolongation of their half-life by C3NeF autoantibodies that prevent convertase dissociation results in pathogenic condition often manifested by renal diseases. However, the diagnosis of convertase abnormalities is difficult due to the labile nature of these enzymes and low credibility of existing methods...
February 2018: Autoimmunity
https://www.readbyqxmd.com/read/29297233/deficiency-of-autoimmune-regulator-impairs-the-immune-tolerance-effect-of-bone-marrow-derived-dendritic-cells-in-mice
#16
Feifei Huo, Dongbei Li, Bo Zhao, Yadong Luo, Bingjie Zhao, Xueyang Zou, Yi Li, Wei Yang
As a transcription factor, autoimmune regulator (Aire) participates in thymic negative selection and maintains immune tolerance mainly by regulating the ectopic expression of tissue-restricted antigens (TRAs) in medullary thymic epithelial cells (mTECs). Aire is also expressed in dendritic cells (DCs). DCs are professional antigen-presenting cells (APCs) that affect the differentiation of T cells toward distinct subpopulations and participate in the immune response and tolerance, thereby playing an important role in maintaining homeostasis...
February 2018: Autoimmunity
https://www.readbyqxmd.com/read/29256263/il-17-and-related-cytokines-involved-in-systemic-sclerosis-perspectives
#17
Rafaela Silva Guimarães Gonçalves, Michelly C Pereira, Andréa Tavares Dantas, Anderson Rodrigues de Almeida, Claudia Diniz Lopes Marques, Moacyr J B M Rego, Ivan R Pitta, Angela Luzia Branco Pinto Duarte, Maira Galdino R Pitta
Systemic sclerosis (SSc) is a multisystemic, complex, and rare disease of connective tissue, with high morbidity and mortality, and without specific treatment. The disease is characterized by three main principles: vascular disease, autoantibody production and inflammation, and fibrosis. Since it is well defined that SSc is characterized by elevated production of TGF-β, IL-6, and IL-1, all of them cytokines related to Th17 differentiation, the hypothesis is that this disease may be strongly related to a polarization of the immune response towards the Th17 pathway...
February 2018: Autoimmunity
https://www.readbyqxmd.com/read/29256262/polymorphisms-and-expression-of-genes-encoding-argonautes-1-and-2-in-autoimmune-thyroid-diseases
#18
Ena Tokiyoshi, Mikio Watanabe, Naoya Inoue, Yoh Hidaka, Yoshinori Iwatani
The microRNA (miRNA) biogenesis pathway is regulated by specific proteins and enzymes, including Dicer, Drosha, DGCR8, Exportin 5 and the Argonaute (AGO) family. In this study, we investigated the AGO family, which is the primary component of RISC (RNA-induced silencing complex) and directly binds to microRNA. We examined the association of polymorphisms in AGO family genes with AGO expression and with the development and prognosis of autoimmune thyroid diseases. We genotyped AGO1 rs636832A/G, AGO2 rs7005286C/T, AGO2 rs11166985A/G and AGO2 rs2292779C/G polymorphisms in 184 Graves' disease (GD) patients, 195 Hashimoto's disease (HD) patients and 122 healthy volunteers using the polymerase chain reaction-restriction fragment length polymorphism method...
February 2018: Autoimmunity
https://www.readbyqxmd.com/read/29239254/the-relationship-between-cell-apoptosis-dysfunction-and-fen1-e160d-mutation-in-lupus-nephritis-patients
#19
Jing Wang, Ping Cao, Yuan-Yuan Qi, Xue-Ping Chen, Li Ma, Rong-Rong Deng, Li-Li Zhang, Yu Zhao
OBJECTIVE: This study aims to evaluate the role of FEN1 E160D mutation in lupus nephritis (LN) patients with cell apoptosis dysfunction. METHODS: (1) Cell apoptosis was detected from 50 paraffin samples obtained from renal biopsies of patients with Class IV LN by TUNEL method and the relationship of the systemic lupus erythematosus disease activity index 2000 (SLEDAI 2000) and renal tissue cell apoptotic index (AI) was discussed. (2) FEN1 gene 61563142-61563342 containing E160D were analysed by extracting genomic DNA from peripheral blood collected from the above 50 LN patients and 25 patients with nephrectomy caused by renal trauma...
December 2017: Autoimmunity
https://www.readbyqxmd.com/read/29226727/high-expression-of-interleukine-1-receptor-antagonist-in-rheumatoid-arthritis-association-with-il1rn-2-2-genotype
#20
S Ramírez-Pérez, U De la Cruz-Mosso, J Hernández-Bello, G E Martínez-Bonilla, M G Ramírez-Dueñas, A L Pereira-Suárez, I Parra Rojas, E Martínez-López, J Macías-Barragán, J F Muñoz-Valle
Rheumatoid arthritis (RA) is an autoimmune disease characterized by inflammation and pro-inflammatory cytokines production. IL-1Ra is an anti-inflammatory cytokine codified by IL1RN gene that blocks IL-1 signalling. A VNTR polymorphism of 86 bp in IL1RN gene has been associated with RA risk and regulation of IL-1Ra expression. In this study, we determined mRNA and protein expression of IL-1Ra in RA patients and control subjects (CS). This study included 85 RA patients classified according to the ACR/EULAR 2010 criteria and 67 CS...
December 2017: Autoimmunity
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