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This study found that fibroblast loss in the upper dermis from UVR exposure is linked to a deregulated inflammatory response, with T cells playing a protective role in fibroblast survival.

This review describes various T-cell-mediated alopecias characterized by distinct lymphocytic patterns and explores their pathophysiology. It highlights the role of CD8+ and regulatory T cells, the JAK/STAT pathway, and stem cell niches, contributing to understanding and potentially addressing these hair loss conditions.

In this study, researchers used a mouse model of alopecia areata to demonstrate that both ruxolitinib and baricitinib, oral JAK inhibitors, reduced hair loss, CD8+ cell infiltration, and expression of disease-related markers, with baricitinib showing greater effectiveness.

This study analyzed blood samples from individuals with alopecia areata and found that NKG2D+ immune cells, particularly memory-like NK cells, may better correlate with disease activity compared to CD8+ cells, though significant variability among individuals complicates these findings.

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.

This study found that UV radiation-induced fibroblast depletion in the skin is primarily due to a deregulated inflammatory response, with T cells aiding fibroblast survival under stress.

In this study using a mouse model and human data, researchers found that CD8+ T cells are central to driving alopecia areata, while regulatory T cells offer some protection, highlighting CD8+ T cells as key targets for future therapy development.

This paper proposes that the induction of HF-specific neo-antigens by peripheral CD8+ T cells may maintain self-tolerance but could also lead to immunopathology in conditions like alopecia areata.

This study observed that NSG-hu-BLT mice developed graft-versus-host disease characterized by CD8+ T lymphocyte-related cell death in the skin and liver, which may affect their utility in other research areas.

This case study suggests that autoimmunity involving cytotoxic CD8+ T cells may link alopecia areata and human T-cell lymphotropic virus-1-associated myelopathy in adult T-cell leukemia/lymphoma patients.

This study found that B6.CD80CD86−/− mice developed autoimmune-like alopecia with nearly 100% incidence by 40 weeks, making them a promising model for studying human alopecia areata.

This study explored peripheral blood immune dysregulation in alopecia areata through single-cell analyses, identifying systemic changes linked to disease severity and key signaling roles for monocytes, NK cells, and memory T cells, suggesting potential therapeutic targets.

In this case study, the progression of alopecia universalis in a Japanese man was linked to the involvement of Th1 and Th17 cells, suggesting an autoimmune mechanism.

In this animal study, researchers discovered that CD4 T cells from mice with alopecia areata can induce the disease more efficiently than those from unaffected mice, likely by supporting CD8 T cell activation and hair follicle attack.

This research developed a mouse model for alopecia areata by transferring lymph node cells from affected mice and reported that treatments with Ritlecitinib or Tacrolimus significantly improved symptoms, with Tacrolimus achieving near-complete hair regrowth.

This study used spatial transcriptomics to investigate T cell-hair follicle interactions in cutaneous lupus erythematosus across mice, dogs, and humans, finding that CXCR3+ T cells and B cells are enriched in lesional skin, with implications for potential therapeutic targets.

The study suggests that refractory chronic alopecia areata cases have more infiltrating skin resident memory T cells, and using a JAK inhibitor may be an effective treatment option.

Alopecia areata involves complex immune cell interactions, especially between CD8+ T cells and macrophages, which could help develop new treatments.

Specific immune cells and pathways contribute to hair follicle inflammation and hair loss, suggesting potential treatments for lichen planopilaris.

This study found that patients with alopecia areata, particularly those with severe cases, exhibit significant systemic immune dysregulation, including altered cell communication networks and epigenetic remodeling in immune cells, suggesting potential pathways for therapeutic targeting.

This study observed that dandruff-affected scalp skin has increased T-cell infiltration in the epidermis and a reduction in the hair follicle's physiological immune privilege, particularly in the suprabulbar outer root sheath area, indicating a distinct immune microenvironment compared to healthy scalp.

The researchers in this study identified molecular mechanisms involved in frontal fibrosis alopecia, highlighting immune response and fatty acid metabolism, and developed a four-gene diagnostic model showing high accuracy in distinguishing affected individuals from controls.

The authors concluded that increasing regulatory T cells in patients with alopecia areata may improve hair follicle regeneration by reducing autoimmune responses, suggesting a potential new therapeutic approach since current treatments are often ineffective with high relapse rates.

This study demonstrated that disrupting EGFR signaling in mice leads to immune sensitivity compromising the hair follicle's protective environment, but JAK1/2 inhibition can restore this immune privilege and stimulate hair growth, suggesting a potential therapy for scarring hair loss diseases like cicatricial alopecia.

Linalool in personal care products may worsen frontal fibrosing alopecia by damaging hair follicle stem cells and triggering harmful immune responses.

This study found that the loss of papillary fibroblasts in the skin due to UV radiation is mainly caused by an uncontrolled inflammatory response, with T cells helping fibroblast survival.

This study found that chronic UVR exposure in mice and humans leads to a permanent loss of papillary fibroblasts in the upper dermis, which is associated with changes in the extracellular matrix.

Immune system changes may contribute to female pattern hair loss.

Discoid lupus erythematosus involves immune activation and fibrosis around hair follicles, with shared pathways across humans, dogs, and mice, suggesting potential treatments for both humans and animals.