Journal of Translational Autoimmunity最新文献

{"title":"The interplay between epidermal barrier distribution, microbiota composition, and immune infiltrate defines and stratifies psoriasis patients and is associated with disease severity","authors":"Elizabeth M. Ortega Rocha ,&nbsp;Paul Hernández-Herrera ,&nbsp;Sofia V. de los Santos- Carmona ,&nbsp;Saraí G De León-Rodríguez ,&nbsp;Ángel Juárez-Flores ,&nbsp;Vadim Pérez-Koldenkova ,&nbsp;Octavio Castro-Escamilla ,&nbsp;Samira Muñoz-Cruz ,&nbsp;Alicia Lemini-López ,&nbsp;Laura C. Bonifaz","doi":"10.1016/j.jtauto.2024.100257","DOIUrl":"10.1016/j.jtauto.2024.100257","url":null,"abstract":"<div><div>Psoriasis is a chronic inflammatory autoimmune skin disease characterized by keratinocyte hyperproliferation, primarily driven by the IL-23/IL-17 axis. In addition to immune response, various skin components, including the epidermal barrier and the skin microbiota, have been individually implicated in the disease pathogenesis. Here, we aimed to investigate the interplay between epidermal tight junctions, Staphylococcus aureus enterotoxin B (SEB), and CD4 T cell-mediated immune responses. By immunofluorescence analyses of skin biopsies, we observed that claudin-1 distribution was significantly altered in psoriatic patients, which correlated with the localization of <em>Staphylococcus aureus</em> and SEB across skin layers and with disease severity. Furthermore, functional CD4 TCRvβ17 cells were associated with SEB presence in patients skin and positively correlated with psoriasis severity. Notably, in patients with SEB detected in the dermis, CD4 TCRvβ17 IL-17 cells were linked to barrier abnormalities.</div><div>Unsupervised analysis stratified psoriasis patients into three groups based on SEB presence and location, supporting the previous findings. The patient group with SEB in the dermis exhibited improved responses to biological therapy, including reductions in PASI score, claudin-1 fragmentation, <em>S. aureus</em> and SEB presence, and CD4 TCRvβ17 cell percentages. Our findings emphasize the complex interplay between epidermal barrier distribution, SEB localization, and functional CD4 TCRvβ17 cells in psoriatic skin, highlighting their potential in patient stratification in association with the severity of the disease.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100257"},"PeriodicalIF":4.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Autoimmune diseases and cardiovascular risk: Mendelian randomization analysis for the impact of 19 autoimmune diseases on 14 cardiovascular conditions","authors":"Yulin Bao ,&nbsp;Lingfeng Gu ,&nbsp;Jiayi Chen ,&nbsp;Hao Wang ,&nbsp;Zemu Wang ,&nbsp;Huijuan Wang ,&nbsp;Sibo Wang ,&nbsp;Liansheng Wang","doi":"10.1016/j.jtauto.2024.100259","DOIUrl":"10.1016/j.jtauto.2024.100259","url":null,"abstract":"<div><h3>Backgroud</h3><div>Autoimmune diseases (AIDs) have been associated with various cardiovascular diseases (CVDs) in observational data. However, the causality of these associations remains uncertain. Therefore, a systematic assessment of the impact of AIDS on cardiovascular risk is required.</div></div><div><h3>Results</h3><div>We assessed the impact of 19 common AIDs on 14 CVDs using bidirectional Mendelian randomization (MR). Celiac disease (odds ratio [OR] = 2.949, 95 % confidence interval [CI]: 1.111–7.827, P = 0.030) and type 1 diabetes mellitus (T1DM) (OR = 1.044, 95 % CI: 1.021–1.068, P = 1.82e-4) were associated with an increased risk of peripheral arterial disease (PAD). Additionally, celiac disease was linked to an increased risk of arrhythmia (OR = 1.008, 95 % CI: 1.002–1.013, P = 0.004), multiple sclerosis to venous thromboembolism (OR = 1.001, 95 % CI: 1.000–1.001, P = 0.010), and psoriasis to heart failure (OR = 1.048, 95 % CI: 1.021–1.077, P = 0.001). Sensitivity analyses were conducted to enhance the robustness of these findings. Predominantly, immune response and inflammation-related pathways were enriched in the aforementioned associations. Mediation analysis identified human leukocyte antigen-DR positive myeloid dendritic cells as partially mediating the effect of T1DM on PAD, with a mediated proportion of 16.61 % (P = 0.028). Potential therapeutic agents, such as tumor necrosis factor-alpha inhibitors and interferon, may have efficacy in treating AID-related CVDs.</div></div><div><h3>Conclusions</h3><div>This study presents genetic evidence of certain AIDs impacting specific CVDs and identifies potential mediators and drugs.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100259"},"PeriodicalIF":4.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Homeostatic signals, including IL-7 and self-MHC recognition, induce the development of peripheral helper T cells, which are enriched in the joints of rheumatoid arthritis","authors":"Ryosuke Tsurui ,&nbsp;Hisakata Yamada ,&nbsp;Takahiro Natori ,&nbsp;Motoki Yoshimura ,&nbsp;Yukio Akasaki ,&nbsp;Shinya Kawahara ,&nbsp;Hiroaki Niiro ,&nbsp;Yuya Kunisaki ,&nbsp;Yasuharu Nakashima","doi":"10.1016/j.jtauto.2024.100258","DOIUrl":"10.1016/j.jtauto.2024.100258","url":null,"abstract":"<div><h3>Objective</h3><div>Dysregulated T cell homeostasis has long been implicated in the pathogenesis of rheumatoid arthritis (RA), in the joint of which peripheral helper T (Tph) cells accumulate and form ectopic lymphoid organs. We examined whether homeostatic signals are involved in the development of Tph cells.</div></div><div><h3>Methods</h3><div>Human peripheral blood mononuclear cells were cultured with IL-7, the critical cytokine for T cell homeostasis. Development of Tph-like cells was assessed by flow cytometry, gene expression, and functional analysis. Chemotaxis of the Tph-like cells to RA synovial fluid (RASF) and the effect of RASF on the development of Tph-like cells was examined.</div></div><div><h3>Results</h3><div>PD-1^highCXCR5^- Tph-like cells developed from human peripheral blood CD4 T cells after proliferation in response to IL-7. Signals from self-MHC recognition and CD28 co-stimulation were also involved. The IL-7-induced Tph-like (IL-7-Tph) cells produced CXCL13 and IL-21 and helped B cells produce IgG. Comprehensive gene expression analysis further supported the similarity with Tph cells in RA joint. IL-7-Tph cells exhibited chemotaxis toward synovial fluid from RA patients (RASF), and RASF promoted the development of IL-7-Tph cells, which were also induced from CD4 T cells residing in non-inflamed joints.</div></div><div><h3>Conclusions</h3><div>Our results demonstrate an antigen-nonspecific developmental pathway of Tph cells triggered by homeostatic signals and promoted by the local environment of RA, which accounts for the accumulation of Tph cells in inflamed joints.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100258"},"PeriodicalIF":4.7,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"C3 glomerulopathy is highly prevalent in French Polynesia","authors":"Nelly Candela ,&nbsp;Nicolas Benichou ,&nbsp;Mathilde Lefebvre ,&nbsp;Lorraine Gueguen ,&nbsp;Paula Vieira-Martins ,&nbsp;Carine El Sissy ,&nbsp;Hervé Sartelet ,&nbsp;Pascale Testevuide ,&nbsp;Ronan Delaval ,&nbsp;Stanislas Faguer","doi":"10.1016/j.jtauto.2024.100254","DOIUrl":"10.1016/j.jtauto.2024.100254","url":null,"abstract":"<div><h3>Objective</h3><div>To compare the natural history of C3 glomerulopathy (C3G) to acute post-infectious glomerulonephritis (APIGN) in a cohort of patients with a relative homogeneity of environment conditions and genetic background.</div></div><div><h3>Methods</h3><div>We retrospectively reviewed the characteristics of all patients with biopsy proven C3G or APIGN referred in 2013–2019 to the only renal unit in French Polynesia.</div></div><div><h3>Results</h3><div>Point prevalence of C3G is ∼23 cases per 100,000 inhabitants. A recurrent variation of CFI (p.Arg406His) was identified at the heterozygous state in 4/8 (50 %) patients with C3G but its pathogenicity remain elusive. Characteristics at presentation and kidney outcomes were roughly similar between C3G (n = 16) and APIGN (n = 20), excepted for the presence of humps on kidney biopsy.</div></div><div><h3>Conclusions</h3><div>C3G is highly prevalent in French Polynesia suggesting specific genetic or environmental susceptibility factors. Systematic diagnosis workflow should be proposed to all patients with C3 predominant glomerulonephritis.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100254"},"PeriodicalIF":4.7,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated analysis of multi-omics data for the discovery of biomarkers and therapeutic targets for juvenile idiopathic arthritis","authors":"Yi-Xin Cai ,&nbsp;Xiao-Li Chen ,&nbsp;Dai-Shan Zheng ,&nbsp;Yue-Zhong Huang ,&nbsp;Zhan-Pei Bai ,&nbsp;Xiu-Feng Huang","doi":"10.1016/j.jtauto.2024.100256","DOIUrl":"10.1016/j.jtauto.2024.100256","url":null,"abstract":"<div><h3>Background</h3><div>Juvenile idiopathic arthritis (JIA) is a prevalent chronic rheumatic disease affecting children. Current medications merely alleviate symptoms rather than curing the disease. Hence, the identification and development of novel drug targets and biomarkers for JIA are imperative for enhancing treatment efficacy.</div></div><div><h3>Methods</h3><div>We employed two-sample Mendelian randomization (MR) analysis to investigate the causal effects of plasma proteins on JIA. Additionally, colocalization, bulk RNA-seq, and single-cell RNA-seq analyses were conducted to further investigate and validate the potential of candidate proteins as drug targets.</div></div><div><h3>Results</h3><div>Through MR analysis, we successfully identified five plasma proteins that are causally linked to JIA. Genetically inferred lower levels of AIF1, TNF, and TNFSF11 were associated with an elevated risk of JIA, while higher levels of AGER and GP1BA proteins were positively correlated with JIA risk. Colocalization analysis further supported our findings on GP1BA (OR = 9.26, 95 % CI: 2.30–37.20) and TNFSF11 (OR = 0.18, 95 % CI: 0.07–0.45). Based on this evidence, we classified these five proteins into two tiers. Finally, we conducted a systematic evaluation of the druggability and current drug development progress for these identified candidate proteins.</div></div><div><h3>Conclusions</h3><div>This study employed MR analysis to reveal causal relationships between plasma proteins and JIA, identifying five potential candidate proteins as promising drug targets for JIA, particularly focusing on GP1BA and TNFSF11.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100256"},"PeriodicalIF":4.7,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association of COVID-19 with Thyroid Dysfunction and Autoimmune Thyroid Disease: A Retrospective Cohort Study","authors":"Jia Di ,&nbsp;Xiaodong Ma ,&nbsp;Tao Wu ,&nbsp;Eryue Qiao ,&nbsp;Mojtaba Salouti ,&nbsp;Yu Zhong ,&nbsp;Qian Xia ,&nbsp;Danfeng Kong ,&nbsp;Min Hao ,&nbsp;Qingwei Xie ,&nbsp;Zhuang Ge ,&nbsp;Dongzheng Liu ,&nbsp;Juanyi Feng ,&nbsp;Xianghong Zheng","doi":"10.1016/j.jtauto.2024.100255","DOIUrl":"10.1016/j.jtauto.2024.100255","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Background&lt;/h3&gt;&lt;div&gt;Since the end of the COVID-19 pandemic, the potential roles of thyroid-inflammatory derangements in driving or being associated with the prognosis of COVID-19 remain controversial. We aimed to clarify the association between COVID-19 infection and thyroid dysfunction, and highlight the impacts of subsequent autoimmune thyroid disease (AITD) on the prognosis of COVID-19.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Methods&lt;/h3&gt;&lt;div&gt;The retrospective, multicenter, cohort study enrolled 2,339 participants with COVID-19 from three hospitals located in the north, middle, and south regions of Shaan Xi Province, China, between December 2022 and July 2023. 464 non-COVID-19 patients within the same period were supplemented, divided into groups with and without AITD. At hospital admission (baseline), 3- and 6-month follow-ups, we presented a dynamic description and correlation analysis of thyroid-inflammatory-autoimmune derangements in patients with AITD.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;A total of 2,082 COVID-19 patients diagnosed with AITD and 257 cases without AITD were included in the study, and 464 non-COVID-19 patients were supplemented, dividing into 14 AITD and 450 non-AITD cases. We found that COVID-19 infection was closely associated with thyroid dysfunction (&lt;em&gt;χ&lt;/em&gt;&lt;sup&gt;&lt;em&gt;2&lt;/em&gt;&lt;/sup&gt; = 1518.129, &lt;em&gt;p&lt;/em&gt; = 0.000). AITD patients with COVID-19 showed a higher prevalence of symptoms and comorbidities and longer hospital stays at baseline than non-AITD patients with COVID-19 (&lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, and &lt;em&gt;p&lt;/em&gt; = 0.000). The baseline free triiodothyronine (FT3), free thyroxine, and radioactive iodine uptake at 24 hours in AITD cases significantly decreased (&lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, and &lt;em&gt;p&lt;/em&gt; = 0.000), while thyroid stimulating hormone, thyroglobulin, reverse triiodothyronine (rT3), and thyroid antibodies varying elevated from the baseline to the follow-up (baseline: &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, and &lt;em&gt;p&lt;/em&gt; = 0.000; 3-month follow-up: &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.030, and &lt;em&gt;p&lt;/em&gt; = 0.000). C-reactive protein, calcitonin, interleukin-6, -8, -10, and tumor necrosis factor-α rose significantly at baseline (&lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000, and &lt;em&gt;p&lt;/em&gt; = 0.000) in AITD. Interferon-α and interferon-γ at baseline showed a significant decrease (&lt;em&gt;p&lt;/em&gt; = 0.000 and &lt;em&gt;p&lt;/em&gt; = 0.000), and remained at low levels after 6 months (&lt;em&gt;p&lt;/em&gt; = 0.000 and &lt;em&gt;p&lt;/em&gt; = 0.000). FT3 and rT3 were positively and negatively correlated with hospitalization, respectively (&lt;em&gt;r&lt;/em&gt; = -0.208, 0.231; &lt;em&gt;p&lt;/em&gt; = 0.000, &lt;em&gt;p&lt;/em&gt; = 0.000). ROC curves showed that FT3 and rT3 had better robustness in predicting severe COVID-19 prognosis (AUC = 0.801, 0.705). Ordered logistic regression revealed that ORs were","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100255"},"PeriodicalIF":4.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Airborne culprits: A comprehensive review of PM, silica, and TCDD in autoimmune diseases","authors":"Daniel Galeano-Sánchez,&nbsp;Victoria Morales-González,&nbsp;Diana M. Monsalve,&nbsp;Carolina Ramırez-Santana,&nbsp;Yeny Acosta-Ampudia","doi":"10.1016/j.jtauto.2024.100253","DOIUrl":"10.1016/j.jtauto.2024.100253","url":null,"abstract":"<div><div>Autoimmune diseases (ADs) are immunological disorders arising from the breakdown of immune tolerance, influenced by various internal and external factors. Persistent exposure to environmental factors, particularly air pollution, is linked to systemic inflammation, oxidative stress, and apoptosis, which contribute to the development of ADs.</div><div>This review examines the impact of air pollutants, including particulate matter, silica, and TCDD, by analyzing epidemiological studies, animal models, and <em>in vitro</em> assays. It focuses on how air pollution disrupts the immune system, leading to apoptosis, increased oxidative stress, cytokine production, autoantigen release, autoantibody production, and autoreactivity, which are particularly significant in ADs like rheumatoid arthritis, systemic lupus erythematosus, Sjögren's syndrome, and systemic sclerosis. In essence, this approach aims to provide a profound understanding of how exposure to air pollution can initiate or contribute to ADs, offering potential avenues for more targeted preventive and therapeutic strategies.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100253"},"PeriodicalIF":4.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extrafollicular CD19lowCXCR5−CD11c− double negative 3 (DN3) B cells are significantly associated with disease activity in females with systemic lupus erythematosus","authors":"Carlo Chizzolini ,&nbsp;Jean-Charles Guery ,&nbsp;Fanny Noulet ,&nbsp;Lyssia Gruaz ,&nbsp;Claire Cenac ,&nbsp;Loredana Frasca ,&nbsp;David Spoerl ,&nbsp;Lionel Arlettaz ,&nbsp;Alice Horisberger ,&nbsp;Camillo Ribi ,&nbsp;Stéphanie Hugues","doi":"10.1016/j.jtauto.2024.100252","DOIUrl":"10.1016/j.jtauto.2024.100252","url":null,"abstract":"<div><h3>Objective</h3><div>B cells play a major role in the development and maintenance of systemic lupus erythematosus (SLE). Double negative (DN) B cells defined by the lack of surface expression of IgD and CD27 have attracted recent interest for their sensitivity to Toll-like receptor 7 (TLR7) ligands and their potential role in the production of autoantibodies. Here we aimed at investigating the possible association of DN B cells and their subsets with SLE disease activity specifically in female patients, in which TLR7 gene has been reported to escape X chromosome inactivation.</div></div><div><h3>Methods</h3><div>Peripheral blood mononuclear cells were purified from woman participating to the clinically well-characterized Swiss SLE Cohort Study (SSCS). PBMC from age-matched healthy females were used as controls. PBMC were stained for cell surface markers, intracellular Tbet and analyzed by multicolor cytofluorimetry. Single nucleotide TLR7 polymorphisms were assessed by polymerase chain reaction.</div></div><div><h3>Results</h3><div>The median SLE disease activity index of the 86 females was 2, IQR [0–6], all but 8 were under chronic SLE treatment. B cells co-expressing CD11c and Tbet were increased, the mean fluorescence intensity (MFI) of CD19 was considerably reduced and we observed a large increase in CD11c + CXCR5-and CD11c-CXCR5-concomitantly with a reduction of CD11c-CXCR5+ B cells in SLE compared to 40 healthy donors (HD). When focusing on the DN B cell subset, we found a reduction of DN1 (CD11c-CXCR5+) and an increase of DN2 (CD11c + CXCR5-) and most impressively of DN3 (CD11c-CXCR5-) cells. The DN subset, particularly DN3, showed the lowest level of CD19 expression. Both DN1 and DN3 percentages as well as the CD19 MFI of DN cells were associated with SLE disease activity. The use of glucocorticoids, immunosuppressants, and antimalarials impacted differentially on the frequencies of DN B cell subsets. CD19 MFI in B cells and the percentage of DN3 were the strongest biomarkers of disease activity. The TLR7 snp3858384 G allele was associated with increased percentages of B cells and CD19⁺CD11c-CXCR5+ and decreased CD19⁺CD11c-CXCR5-.</div></div><div><h3>Conclusions</h3><div>DN3 B cells are strongly associated with SLE clinical activity pointing to their potential involvement in disease pathogenesis, and CD19 expression level performs accurately as disease activity biomarker.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100252"},"PeriodicalIF":4.7,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mitochondrial DNA copy number and the risk of autoimmune diseases: A Mendelian randomization study with meta-analysis","authors":"Mingzhu Liu ,&nbsp;Xiongquan Long ,&nbsp;Shuangshuang Fu ,&nbsp;Yuyang Zhang ,&nbsp;Zihao Liu ,&nbsp;Xiaoping Xu ,&nbsp;Minghao Wu","doi":"10.1016/j.jtauto.2024.100251","DOIUrl":"10.1016/j.jtauto.2024.100251","url":null,"abstract":"<div><h3>Background</h3><div>Mitochondrial DNA plays a crucial role in the pathophysiology of autoimmune diseases (ADs). However, the association between mitochondrial DNA copy number (mtDNA-CN) and ADs risk is controversial. In this study, Mendelian randomization (MR) analysis and meta-analysis were performed using three sets of independent instrumental variables (IVs) to investigate the potential association between mtDNA-CN and 20 types of ADs.</div></div><div><h3>Methods</h3><div>The three sets of IVs were drawn primarily from participants in the UK Biobank and the Cohorts for Heart and Aging Research in Genomic Epidemiology consortium using different methods. Outcome data for ADs were investigated using summary statistics from the FinnGen cohort. The potential causal associations were assessed using inverse-variance weighting (IVW), MR-Egger, and weighted median methods. Sensitivity analysis and the Steiger test were used to verify the robustness of the MR estimates. In addition, a meta-analysis was conducted to pool the results from three IV groups.</div></div><div><h3>Results</h3><div>Overall, genetically predicted mtDNA-CN was not associated with ADs risk (OR = 1.046, 95 % CI: 0.964–1.135, P = 0.283). However, subgroup analyses showed positive causal associations of mtDNA-CN with autoimmune hypothyroidism (OR = 1.133, 95 % CI: 1.016–1.262, P = 0.024) and rheumatoid arthritis (OR = 1.219, 95 % CI: 1.028–1.445, P = 0.023). In contrast, there was no causal association between mtDNA-CN and atopic dermatitis as well as psoriasis, ulcerative colitis, adult-onset Still disease, type1 diabetes, Crohn disease, sarcoidosis, ankylosing spondylitis, multiple sclerosis, autoimmune hyperthyroidism, primary sclerosing cholangitis, systemic lupus erythematosus, systemic sclerosis, alopecia areata, myasthenia gravis, Guillain-Barre syndrome, dermatopolymyositis, and vitiligo.</div></div><div><h3>Conclusions</h3><div>This MR analysis showed mtDNA-CN is causally associated with an increased risk of autoimmune hypothyroidism and rheumatoid arthritis at the genetic level. The findings have important implications for the use of mtDNA-CN as a biomarker for risk assessment of autoimmune hypothyroidism and rheumatoid arthritis in clinical practice.</div></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100251"},"PeriodicalIF":4.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vascular injury derived apoptotic exosome-like vesicles trigger autoimmunity","authors":"Sandrine Juillard ,&nbsp;Annie Karakeussian-Rimbaud ,&nbsp;Marie-Hélène Normand ,&nbsp;Julie Turgeon ,&nbsp;Charlotte Veilleux-Trinh ,&nbsp;Alexa C. Robitaille ,&nbsp;Joyce Rauch ,&nbsp;Andrzej Chruscinski ,&nbsp;Nathalie Grandvaux ,&nbsp;Éric Boilard ,&nbsp;Marie-Josée Hébert ,&nbsp;Mélanie Dieudé","doi":"10.1016/j.jtauto.2024.100250","DOIUrl":"10.1016/j.jtauto.2024.100250","url":null,"abstract":"<div><p>According to a central tenet of classical immune theory, a healthy immune system must avoid self-reactive lymphocyte clones but we now know that B cells repertoire exhibit some level of autoreactivity. These autoreactive B cells are thought to rely on self-ligands for their clonal selection and survival. Here, we confirm that healthy mice exhibit self-reactive B cell clones that can be stimulated <em>in vitro</em> by agonists of toll-like receptor (TLR) 1/2, TLR4, TLR7 and TLR9 to secrete anti-LG3/perlecan. LG3/perlecan is an antigen packaged in exosome-like structures released by apoptotic endothelial cells (ApoExos) upon vascular injury. We demonstrate that the injection of ApoExos in healthy animals activates the IL-23/IL-17 pro-inflammatory and autoimmune axis, and produces several autoantibodies, including anti-LG3 autoantibodies and hallmark autoantibodies found in systemic lupus erythematosus. We also identify γδT cells as key mediators of the maturation of ApoExos-induced autoantibodies in healthy mice. Altogether we show that ApoExos released by apoptotic endothelial cells display immune-mediating functions that can stimulate the B cells in the normal repertoire to produce autoantibodies. Our work also identifies TLR activation and γδT cells as important modulators of the humoral autoimmune response induced by ApoExos.</p></div>","PeriodicalId":36425,"journal":{"name":"Journal of Translational Autoimmunity","volume":"9 ","pages":"Article 100250"},"PeriodicalIF":4.7,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589909024000200/pdfft?md5=10a63c2cb5c64a890726d7f77c3163c6&pid=1-s2.0-S2589909024000200-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}