February 2026 in “Journal of Allergy and Clinical Immunology” In this single-cell transcriptomic study, researchers analyzed AA scalp samples and found distinct immune and nonimmune cell activation patterns, with elevated TH1/TH2 and JAK/STAT markers potentially contributing to hair follicle immune privilege disruption and disease severity.
June 2025 in “bioRxiv (Cold Spring Harbor Laboratory)” This study found that in alopecia areata, epidermal γδ T cells and macrophages contribute to the disease alongside CD8 T cells, with the expression of BST2 marking interferon-driven immune activation in both mouse and human skin, which decreases following treatment with the JAK inhibitor tofacitinib.
November 2023 in “Journal of Investigative Dermatology” This study used advanced single-cell RNA and chromatin sequencing to investigate differences in peripheral blood cells between mild and severe alopecia areata patients, uncovering shared transcription factor motifs that may explain disease severity and open avenues for future research on therapeutic targets.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that patients with alopecia areata had significantly lower frequencies of IL-10 producing CD19+CD24hiCD38hi regulatory B cells compared to healthy volunteers, suggesting a potential role for these cells in the autoimmune response seen in the condition.
April 2017 in “Journal of Investigative Dermatology” This study found that miR-486 and miR-451 levels were reduced in alopecia areata-affected skin, and delivering their mimics to mice mitigated symptoms by reducing inflammation and immune activity.
245 citations
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October 2015 in “Nature medicine” The research found that hair follicle–derived cytokines, particularly IL-15 and IL-7, regulate skin-resident memory T cells and their role in both immune homeostasis and lymphoma in the skin.
127 citations
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January 2000 in “Journal of Investigative Dermatology” This study found that pro-inflammatory cytokines and apoptotic mechanisms, specifically involving granzyme B and Fas pathways, are associated with chronic alopecia areata, indicating their potential role in the disease's persistence.
114 citations
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August 2002 in “Journal of Investigative Dermatology” Alopecia areata is caused by an immune response, and targeting immune cells might help treat it.
60 citations
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September 2015 in “Expert Review of Clinical Immunology” This study suggests that CD8+ cytotoxic T lymphocytes play a crucial role in the development of alopecia areata, based on observations in rodent models that mimic human autoimmune disease.
59 citations
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June 2023 in “Nature Aging” This study observed that in aged mouse skin, there was an increase in IL-17-expressing T helper cells, γδ T cells, and innate lymphoid cells, and blocking IL-17 signaling reduced skin inflammation and delayed age-related changes, suggesting it as a potential target to mitigate skin aging.
49 citations
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August 2022 in “Frontiers in Immunology” This paper discusses the evolving understanding of psoriasis pathogenesis with no new clinical findings; the authors highlight the role of T-cell plasticity and regulatory cells, calling for further clinical applications using single-cell technologies.
29 citations
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May 2020 in “npj Regenerative Medicine” This review discusses the role of the immune niche in hair follicle regeneration and its impact on different forms of alopecia, highlighting research gaps and potential therapeutic strategies.
24 citations
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May 2006 in “Journal of Investigative Dermatology” This study found that allergen treatment in alopecia areata mice appeared to alter leukocyte subset distribution and impaired dendritic cell migration, which may affect T-cell activation and hair follicle recovery.
4 citations
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November 2021 in “Molecular Medicine Reports” In this study on a mouse model of vitiligo, NB-UVB/ADSC combination therapy improved oxidative stress and calcium homeostasis, but the protective effect was reversed by inhibiting Nr2 signaling.
3 citations
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January 2023 in “JEADV Clinical Practice” This study suggests that IL-17 may play a more significant role than IFN-γ in the pathogenesis of chronic alopecia areata, with increasing severity linked to Th17 lymphocytes and cytotoxic T lymphocyte infiltration.
2 citations
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June 2024 in “Medical Journal of Babylon” In this study, researchers observed significantly higher CD8+ T cell levels in Iraqi patients with Alopecia areata compared to healthy controls, alongside concluding that the condition is more prevalent in men.
1 citations
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October 2022 in “JCI insight” In this study, conditional deletion of BRD4 in OX40-expressing cells of mice led to alopecia, dermatitis, and loss of hair follicle stem cell function, revealing BRD4's role in skin inflammation and stem cell regulation.
May 2024 in “International Journal of Molecular Sciences” This study found that injecting mouse hair follicle-derived mesenchymal stem cells (moMSCORS) into C57BL/6 mice reduced the incidence and severity of type 1 diabetes by modulating immune responses, suggesting potential for therapeutic use due to their immunosuppressive effects.
This study provides a detailed analysis of cell subpopulations in a mouse model of wound-induced hair follicle regeneration, revealing specific cellular dynamics and heterogeneity that may influence hair follicle neogenesis.
April 2021 in “Sohag Medical Journal” This review outlines the proposed theories behind the development of alopecia areata, emphasizing the autoimmune process involving lost immune privilege in hair follicles, and stresses the need to pinpoint specific pathogenic mechanisms for potential treatments.
144 citations
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November 2020 in “Frontiers in immunology” This study summarizes how the IL-23/IL-17 axis contributes to inflammatory skin diseases like psoriasis and highlights that biologics targeting this pathway, including monoclonal antibodies against IL-23 and IL-17, have shown efficacy in clinical trials for these conditions.
52 citations
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March 2010 in “British Journal of Dermatology” This study demonstrated the expression of type 1 interferon-related proteins in inflammatory lesions of alopecia areata, showing a distinct distribution pattern compared to cicatricial alopecia.
50 citations
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May 2021 in “Frontiers in immunology” This review discusses how tissue resident memory T cells contribute to autoimmune skin diseases like vitiligo and psoriasis, highlighting their role in continuous immune activation, and reports no new clinical results.
43 citations
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May 2011 in “Dermatologic Therapy” This article discusses the phases and histological features of alopecia areata and reports no new clinical findings; the authors emphasize recognizing these phases for accurate diagnosis.
30 citations
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February 2023 in “Journal of Investigative Dermatology” OX40-targeted therapies may help treat skin diseases by reducing inflammation and balancing immune responses.
27 citations
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August 2015 in “Journal of Investigative Dermatology” This study found that sex bias exists in dermatological research, with 60% of articles not reporting the sex of cells or animals and a disproportionate use of male cells and animals when known.
23 citations
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June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” This review discusses rodent models of alopecia areata and suggests they are crucial for understanding the autoimmune mechanisms and potential treatments but reports no new clinical results.
16 citations
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November 2005 in “Journal of Investigative Dermatology Symposium Proceedings” This study found that intramuscular anti-IFN-γ significantly stabilized and promoted hair regrowth in alopecia areata patients with patchy, progressive hair loss, whereas those with total baldness showed more limited improvement.
14 citations
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September 2018 in “The journal of allergy and clinical immunology/Journal of allergy and clinical immunology/The journal of allergy and clinical immunology” In this study, a novel homozygous mutation in the STAT5B gene was identified in a 17-year-old boy with growth hormone-refractory growth failure, severe eczema, and autoimmune disease, suggesting a similarity to known STAT5B deficiency phenotypes.
9 citations
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March 2022 in “Frontiers in Immunology” This review discusses the roles and mechanisms of tissue-resident regulatory T cells in immune regulation and tissue homeostasis, but reports no new experimental results.