13 citations
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August 2020 in “Frontiers in Immunology” This review explores the expression of Perforin by gamma delta T cells in human skin and its role in cytotoxicity but reports no new experimental results.
6 citations
,
June 2011 in “British Journal of Dermatology” This study found that individuals with alopecia areata had significantly higher serum levels of retinol-binding protein 4 and increased IgG immunoreactivity against it, suggesting a role in the disease's pathogenesis.
6 citations
,
September 2019 in “Archives of Dermatological Research” In this study, researchers identified 32 differentially expressed genes involved in androgenetic alopecia, with down-regulated genes associated with Wnt and TGF-beta signaling and up-regulated genes linked to oxidative stress pathways.
6 citations
,
September 2009 in “European journal of histochemistry” This study found that CD90+ stem cells with fibroblast-like morphology are present in the lower part of the anagen hair follicle in dogs.
September 2017 in “Journal of Investigative Dermatology” This study suggests that sweat glands may have an immune privilege similar to hair follicles, and disruptions in this could contribute to autoimmune skin diseases.
19 citations
,
August 2017 in “American journal of clinical dermatology” This analysis reports that hepatitis B surface protein antigen exposure is associated with an increased risk of alopecia areata.
9 citations
,
February 2001 in “Journal of Dermatological Science” This study found that the expressions of CDK inhibitors p21waf1/cip1 and p27kip1 were higher during the anagen phase compared to telogen, suggesting a role in follicular epithelial cell differentiation.
3 citations
,
January 2003 in “Cell Structure and Function” This study found that Meth-A cells induced alopecia in mice, but this effect was blocked by a protein kinase inhibitor, suggesting immunological mechanisms involving lymphokine-activated killer cells.
4 citations
,
April 2010 in “Expert review of dermatology” This article discusses the immune privilege in hair follicles and suggests that restoring its collapse might be an effective strategy for treating alopecia areata and cicatricial alopecia, but it reports no new clinical results.
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.
71 citations
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May 2007 in “The FASEB journal” This study found that human hair follicles express erythropoietin and its receptor, suggesting these follicles may use erythropoietin signaling to modulate apoptosis under stress conditions like hypoxia and chemotherapy.
52 citations
,
April 2013 in “Developmental Cell” This study found that Brg1, a chromatin-remodeling enzyme, plays a critical role in hair regeneration and early epidermal repair by regulating bulge stem cells through a Brg1-Shh interaction.
182 citations
,
August 2016 in “Development” This review discusses the roles and mechanisms of chromatin remodelers and their subunits in mammalian development, but reports no new experimental results.
34 citations
,
August 2016 in “Scientific Reports” This study validated a protocol for inducing surface ectoderm differentiation from human induced pluripotent stem cells and highlighted the role of TGFβ signaling pathways in this process.
April 2018 in “The journal of investigative dermatology/Journal of investigative dermatology” In a laboratory setting, this study found that Biotrinine® dry extract activated hair follicle growth pathways and increased certain growth factor secretions in human dermal papilla cells, suggesting potential benefits for treating chronic hair loss.
April 2018 in “The journal of investigative dermatology/Journal of investigative dermatology” This study suggests that low-dose blue light (453nm) may positively affect hair growth by interacting with the receptors CRY1 and OPN3 in hair follicle cells.
1 citations
,
June 2021 in “Journal of pharmacopuncture” This study found that while CBD did not change gene expression including β-catenin in hair follicles, it restored decreased β-catenin expression in dermal papilla cells affected by testosterone or PMA, suggesting a potential modulating function on alopecia.
April 2021 in “Journal of Investigative Dermatology” This study suggests that edelweiss extract may promote hair growth and reduce shedding in ex vivo experiments by affecting hair follicle anagen phase duration and keratinocyte proliferation.
23 citations
,
March 2001 in “Clinics in dermatology” This study found that 363 genes were differentially expressed in alopecia areata skin compared to non-lesional skin, suggesting T-cell mediated immune responses and distinct gene profiles related to the disease's stage.
42 citations
,
March 2008 in “Molecular and Cellular Endocrinology” This review explores the potential (neuro-)endocrine influences on hair follicle epithelial stem cell biology and emphasizes the need for more systematic research, but it provides no new empirical results.
1 citations
,
September 2024 in “Journal of the American Academy of Dermatology” Farudodstat may effectively treat alopecia areata without harmful side effects.
119 citations
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December 2008 in “The journal of investigative dermatology/Journal of investigative dermatology” In this study, transcutaneously applied nanoparticles and viral vectors were shown to penetrate murine hair follicles, internalize in antigen-presenting cells, and induce immune responses, suggesting a promising approach for vaccine delivery.
220 citations
,
June 2013 in “The Journal of Pathology” This study found that immune privilege collapse in the hair follicle bulge and associated immune responses may contribute significantly to the pathogenesis of lichen planopilaris, suggesting a potential autoimmune basis for the disease.
21 citations
,
June 2011 in “Investigative Ophthalmology & Visual Science” This article argues that human scalp hair follicles could serve as a surrogate model for studying immune privilege in the human eye, offering a novel approach for ocular IP research.
July 2024 in “Journal of Investigative Dermatology” Linalool in fragrances may harm hair follicles and contribute to hair loss.
March 2024 in “International Journal of Cosmetic Science” 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.
5 citations
,
April 2022 in “Evidence-based Complementary and Alternative Medicine” This study explored the mechanism of Shaoyao Gancao decoction in treating alopecia areata and found that it may be closely related to the PI3K/AKT signaling pathway.
April 2026 in “Frontiers in Medicine” This study found that activating hair follicle resident T cells in a human organ culture can induce an alopecia areata-like immune response, and that the drug farudodstat partially reduced this effect.
In this study, the researchers used a human hair follicle model to demonstrate that T cell stimulation can induce an alopecia areata–like phenotype, with cell proliferation and immune privilege collapse; however, the DHODH inhibitor farudodstat partially mitigated these effects by reducing T cell proliferation.
In this study, ritlecitinib treatment for 12 and 24 weeks downregulated immunity-related genes and upregulated hair keratin genes in patients with alopecia areata, correlating with scalp hair regrowth response.