Jonas Lowack , Alexander PJ Vlaar , Robert B Klanderman , Anna-Linda Peters
{"title":"Pulmonary transfusion reactions as an immunological spectrum disorder","authors":"Jonas Lowack , Alexander PJ Vlaar , Robert B Klanderman , Anna-Linda Peters","doi":"10.1016/j.coi.2025.102689","DOIUrl":"10.1016/j.coi.2025.102689","url":null,"abstract":"<div><div>Transfusion-associated circulatory overload (TACO) and transfusion-related acute lung injury (TRALI) are leading causes of transfusion-related morbidity and mortality. Despite distinct diagnostic criteria, both syndromes present similarly with respiratory distress and pulmonary edema. In recent research, they increasingly appear to share pathophysiological and immunological features. In this review, we discuss current evidence supporting a spectrum model of pulmonary transfusion reactions, spanning hydrostatic to permeability edema. We highlight key immunological mechanisms in TRALI, including Fc-receptor or complement engagement, and cytokine responses, and explore emerging evidence of immune involvement in TACO. To differentiate, the anti-inflammatory cytokine interleukin (IL)-10 and pro-inflammatory IL-6 emerge as potential biomarkers with diagnostic and therapeutic implications. The underdiagnosis of reverse TRALI and TRALI/TACO overlap further highlights the need for additional mechanistic insight and improved diagnostics. Future work should focus on biomarker-guided phenotyping to improve clinical differentiation and treatment strategies for transfusion-related respiratory complications as a spectrum disorder.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102689"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marcin Radziszewski , Kandice L Tessneer , Christopher J Lessard
{"title":"The power of genetics in decoding Sjögren’s disease: current status and future development","authors":"Marcin Radziszewski , Kandice L Tessneer , Christopher J Lessard","doi":"10.1016/j.coi.2025.102690","DOIUrl":"10.1016/j.coi.2025.102690","url":null,"abstract":"<div><div>Sjögren’s disease (SjD) is the second most common systemic autoimmune disease in the United States. SjD patients are predominantly women 30–50 years of age and exhibit heterogeneous clinical manifestations, including symptoms of extensive dryness, chronic fatigue, and joint pain, and various major organ involvement. Late onset, clinical heterogeneity, and limited mechanistic understanding of its etiology frequently lead to delayed or misdiagnosis. Although the etiology of SjD is unclear, candidate gene studies and population-based genome-wide association studies suggest that SjD results from an interplay between genetics and environment. Defining the genetic susceptibility of SjD remains an important research focus to improve the understanding of SjD etiology and the development of diagnostic and treatment options. Unfortunately, the genetic understanding of SjD lags far behind that of other related autoimmune diseases. This review provides a brief history of key milestones in the field of SjD genetics and highlights several areas of future research that will bolster the discovery power of ongoing genetic studies and define the underlying mechanisms that drive disease etiology.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102690"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145497970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Toward indole postbiotics precision therapy via AI-powered drug delivery technologies","authors":"Puccetti Matteo , Pariano Marilena , Wojtylo Paulina Anna , Ricci Maurizio , Stefano Giovagnoli","doi":"10.1016/j.coi.2025.102692","DOIUrl":"10.1016/j.coi.2025.102692","url":null,"abstract":"<div><div>Recent advancements in microbiome research have revealed the restorative capacities of postbiotics, including indole and its derivatives generated via bacterial tryptophan metabolism. Widespread in prokaryotic and eukaryotic communities, indole and its derivatives are uniquely suited to promote host physiology and homeostasis at the host/microbe interface. In addition to suppressing the bacterial pathogenesis, the antioxidant, anti-inflammatory, antidiabetic, antihypertensive, immunomodulatory, and metabolic activities of indole and its derivatives make these postbiotics an attractive therapeutic option. However, their clinical translation is impeded by pharmacokinetic constraints, structural promiscuity, and formulation difficulties. This review examines the current status of indole bioactivities, identifies translational challenges, and suggests the use of artificial intelligence as a method for establishing a comprehensive framework for future translational development.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102692"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145508529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sarcoidosis of the nervous system: a rare but serious manifestation","authors":"Patompong Ungprasert , Brandon P Moss","doi":"10.1016/j.coi.2025.102704","DOIUrl":"10.1016/j.coi.2025.102704","url":null,"abstract":"<div><div>Clinically overt granulomatous involvement of the nervous system, or neurosarcoidosis, occurs in up to 5% of patients with sarcoidosis. Diagnosing neurosarcoidosis is often challenging due to its highly heterogeneous and frequently nonspecific clinical presentations, as well as the difficulty in obtaining tissue confirmation. In practice, the diagnosis of neurosarcoidosis is typically made based on supportive findings from ancillary tests — such as magnetic resonance imaging and cerebrospinal fluid analysis — in conjunction with the exclusion of alternative diagnoses in patients with known extraneural sarcoidosis. Current treatment recommendations are largely based on expert opinion and retrospective studies. Several factors should guide the initial treatment strategy, including disease extent, severity, functional impairment, comorbidities, and patient preferences. Glucocorticoids remain the cornerstone of therapy, with steroid-sparing agents and biologics frequently required in more severe cases.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102704"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145716807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elizabeth L Frost , Arijita Jash , Angelo D’Alessandro , Krystalyn E Hudson , James C Zimring
{"title":"The role of linked recognition and B cell precursor frequency in alloimmunization to transfused RBCs","authors":"Elizabeth L Frost , Arijita Jash , Angelo D’Alessandro , Krystalyn E Hudson , James C Zimring","doi":"10.1016/j.coi.2025.102705","DOIUrl":"10.1016/j.coi.2025.102705","url":null,"abstract":"<div><div>Despite multiple alloantigenic differences in every allotransfusion, only 3–6% of transfusion recipients develop a detectable alloantibody even with multiple transfusions. Moreover, patients typically become alloimmunized only to some of the alloantigens to which they are exposed. In recent decades, precursor frequency of antigen-specific T and B cells has been demonstrated to be a key determinant of adaptive immunity. Given the small differences between donor and recipient alloantigens (typically a single amino acid), precursor frequencies for T and B cells are predicted to be extremely low for a given alloantigen. In this review, it is argued based upon existing evidence in the literature and new data presented herein that linked recognition occurs with red blood cell (RBC) alloantigens resulting in a dramatically increased precursor frequency for CD4<sup>+</sup> T cell help with no increase in B cell precursor frequency. The hypothesis is forwarded that B cell precursor frequency is a limiting factor in RBC alloimmunization.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102705"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145776942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Is psoriatic arthritis a dissemination of cutaneous psoriatic TRM cells? Role of tissue-resident memory T cells (TRM) in psoriatic disease","authors":"Siba P Raychaudhuri , Smriti K Raychaudhuri","doi":"10.1016/j.coi.2025.102702","DOIUrl":"10.1016/j.coi.2025.102702","url":null,"abstract":"<div><div>Tissue resident memory T cells (TRM) cells are a recently defined subtype of nonrecirculating memory T cells with longevity and protective functions in peripheral tissues. The discovery of T cells resident in diverse tissues has altered our understanding of adaptive immunity with respect to site-specific immune response. For frontline defense against infections, TRM cells are essential. Accumulating evidence also implies that TRM cells are likely to contribute to the relapse and chronicity in autoimmune diseases, including psoriatic disease. A number of studies have shown the relationship between the pathogenesis of psoriasis and skin-resident memory T cells. Here, we discussed recent insights into the generation, homing, survival, and retention of TRM cells and shared our perspectives on the functions of TRM cells in the recurrence of psoriasis and psoriatic arthritis (PsA). This review summarizes the role of TRM cells in the pathology of psoriasis/PsA, with a view to develop potential novel therapies and therapeutic targets.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102702"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145672895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Francesco Siracusa , Andres Machicote , Samuel Huber , Nicola Gagliani
{"title":"Diet-derived microbial metabolites as regulators of immune function","authors":"Francesco Siracusa , Andres Machicote , Samuel Huber , Nicola Gagliani","doi":"10.1016/j.coi.2025.102713","DOIUrl":"10.1016/j.coi.2025.102713","url":null,"abstract":"<div><div>The intestinal microbiota transforms dietary components into bioactive metabolites that profoundly influence mucosal and systemic immunity. Short-chain fatty acids, secondary bile acids and tryptophan-derived indoles are among the most studied microbial metabolites shaping T, B and innate immune cell functions through a variety of mechanisms, including receptor signaling, epigenetic modification and metabolic reprogramming. Dietary habits strongly affect the composition of the intestinal microbiota and thus, the production and availability of these microbial metabolites, with consequences that range from protective immune regulation to detrimental inflammatory responses. Here, we review recent findings from mouse and human studies, highlighting how the microbiota–immunity axis can be modulated by diets and discuss implications for tissue homeostasis, infection and chronic inflammatory diseases. Understanding this complex interplay may guide the development of <em>ad hoc</em> dietary and microbial interventions to restore tolerance and improve therapeutic outcomes.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102713"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145822507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Loukas Chatzis , Dimitris Anastasios Palamidas , Thomas Dörner
{"title":"Mapping the B-cell axis in Sjögren’s disease: repertoire, microenvironment, and potential routes to precision treatment","authors":"Loukas Chatzis , Dimitris Anastasios Palamidas , Thomas Dörner","doi":"10.1016/j.coi.2025.102712","DOIUrl":"10.1016/j.coi.2025.102712","url":null,"abstract":"<div><div>Sjögren’s disease (SjD) is a chronic autoimmune disorder in which sustained B-cell activation drives glandular injury and systemic complications. Epithelial stress and interferon tone amplify B-cell activating factor (BAFF)-dependent survival, skewing selection toward autoreactive clones in both glands and blood. In addition, single-cell B-cell receptor analyses have uncovered interferon-high endotypes with tissue-imprinted oligoclonality and biased isotype and light-chain usage. Within salivary glands, ectopic germinal centers and FcRL4⁺ B cells act as local ‘training sites,’ integrating Tfh/Tph help, CXCL13 cues, and BAFF/APRIL-NF-κB signaling to sustain plasmablast differentiation. Extrafollicular trajectories — double-negative and age-associated B cells — expand in IFN/TLR7 and IL-21 milieus, while regulatory B-cell restraint is diminished. Emerging data also implicate glycolysis and mTORC1-GLUT1 metabolism in sustaining B-cell hyperactivation. Chronic B-cell receptor signaling and clonal evolution provide a bridge to lymphoma risk. In this review, we outline how these converging pathways define molecular endotypes and propose a precision framework linking them to targeted therapy in SjD.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102712"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145822528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nicolle Sweeney , Yemil Atisha-Fregoso , Rita Pozovskiy , Lauren Higdon , Mark Anderson , Betty Diamond , William M Ridgway
{"title":"Can we cure autoimmunity?","authors":"Nicolle Sweeney , Yemil Atisha-Fregoso , Rita Pozovskiy , Lauren Higdon , Mark Anderson , Betty Diamond , William M Ridgway","doi":"10.1016/j.coi.2025.102684","DOIUrl":"10.1016/j.coi.2025.102684","url":null,"abstract":"<div><div>Autoimmune diseases have, until recently, been treated with relatively broad immunosuppressive regimens. Newer, more focused monoclonal antibody therapies directed to specific targets, for example, anti-TNF or anti-B cell therapies, can produce significant immunosuppression. ‘Remission’ of autoimmune disease that requires ongoing immunosuppression is not an ideal solution. We define a ‘cure’ for autoimmunity as: <em>resolution of disease without ongoing immunosuppressive therapy</em>. Herein, we discuss the possibilities of such a cure, the mechanisms behind such approaches, and obstacles in the setting of representative systemic (systemic lupus erythematosus, or SLE) and organ-specific (type 1 diabetes, T1D) autoimmune diseases. ‘Cure’ of autoimmunity is a remarkably difficult goal and, as illustrated here, will require detailed scientific understanding of each autoimmune disease, even beyond the remarkable advances achieved to date. The basic distinction between autoimmune diseases, in which the target organ is largely destroyed at clinical onset (e.g. T1D), and systemic diseases affecting multiple organs strongly affects how progress can be made towards a cure. In the case of systemic disease, obtaining exact further knowledge of the role of immune cell subsets (e.g. short-lived plasma cells in SLE) is critical. In organ-specific autoimmunity, such as in T1D, improved preclinical detection and characterization of the preclinical immune pathology will be essential.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102684"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145498011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Revisiting tryptophan metabolism in cancer: complexity, context, and spatial heterogeneity","authors":"Teng Teng Xu , Camille Guyot , Peter J Murray","doi":"10.1016/j.coi.2025.102706","DOIUrl":"10.1016/j.coi.2025.102706","url":null,"abstract":"<div><div>Tryptophan (TRP) metabolism has long been associated with cancer immunity, primarily through the kynurenine pathway mediated by indoleamine-2,3-dioxygenase 1 (IDO1) and tryptophan-2,3-dioxygenase (TDO2). Both enzymes can deplete TRP within cells and in local microenvironments, triggering dysfunction of T cells with anti-tumor functions. This view fostered the development of IDO1/TDO2 inhibitors, which ultimately failed in clinical trials. However, we now know that TRP metabolism in tumors is far more complex than anticipated. Recent work highlights the dual, context-dependent roles of TRP-depleting enzymes. Importantly, advances in spatial profiling have uncovered that TRP-metabolizing enzymes are not uniformly expressed but instead form distinct metabolic niches within tumors. These niches shape local TRP availability, metabolite gradients, downstream metabolic signaling, and immune responses in ways that cannot be captured by bulk or single-cell approaches alone. This review synthesizes emerging insights into the diverse and spatially defined functions of TRP metabolism in cancer and discusses how integrating spatial omics may guide next-generation therapeutic strategies beyond IDO1 inhibition.</div></div>","PeriodicalId":11361,"journal":{"name":"Current Opinion in Immunology","volume":"98 ","pages":"Article 102706"},"PeriodicalIF":5.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145727694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}