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In this study, researchers developed a relatively simple punch assay for regenerating hair follicles using mouse or human cells, finding efficient hair formation with mouse cells but low efficiency with human cells on reconstituted human skin.

This case report indicates that contact dermatitis on the face can result from using a bleaching ointment containing ammonium bisulfite during hair-dyeing.

In this study, one type of commercial culture medium supported expression of stem cell markers in hair follicle epithelial stem cells, but their differentiation potential and hair follicle-inducing ability declined over time.

This study found that peptidylarginine deiminase type III and trichohyalin are coincidentally expressed in the infant rat hair follicle, but trichohyalin deimination occurs after their expression during development.

This study found that nestin-expressing progenitor cells, capable of becoming ORS keratinocytes, are present in both developing and adult mouse hair follicles.

In a keratinocyte-specific knockout mouse model, this study found that deleting GRK2 disrupted hair follicle homeostasis, causing cyst-like structures, abnormal growth patterns, and eventual hair loss, suggesting potential links to immune-mediated alopecias.

This study revealed that nestin-expressing progenitor cells capable of becoming ORS keratinocytes are present during both hair follicle development and in adult hair follicles.

This study found that nestin-expressing unipotent progenitor cells capable of differentiating into outer root sheath keratinocytes are present during hair follicle development and in adult hair follicles.

This study observed that PAD type III and trichohyalin are expressed earlier than their deiminated form during the first and second hair cycles in rat hair follicles, indicating a potential additional factor is involved in triggering deimination.

This study found that modulating BMP activity in transgenic mice affects the development and characteristics of several ectodermal organs, such as skin, hair, and claws, highlighting a stage-dependent influence on organogenesis.

In this study, researchers found that TCDD exposure accelerated differentiation and altered gene expression in human epidermal cells, indicating the epidermal barrier as a target of TCDD-activated AHR.

This study found that Merkel cell clusters require Frizzled6 signaling for their polarity information, while other hair follicle-associated structures align their orientation based on the hair follicle itself.

This study found that Ift20 is essential for hair follicle stem cell identity and hair regrowth, and it regulates keratinocyte migration during wound healing through focal adhesion integrin recycling, independently of ciliogenesis.

This study reported that IL-15 promotes human hair growth and protects hair follicle immune privilege, potentially stabilizing alopecia areata treatment outcomes when selectively stimulating IL-15Rα signaling.

This study found that K15 is variably expressed in sheep and mouse hair follicles, with specific patterns suggesting a role in the early stages of keratinocyte differentiation.

This study found that the ARL15 gene affects adipocyte differentiation and adiponectin secretion, and suggests that ARL15 haploinsufficiency may predispose individuals to lipodystrophy.

This study suggests that interleukin-15 plays a complex role in alopecia areata, potentially contributing to immune infiltration while also protecting against hair follicle immune privilege collapse and promoting hair growth.

This report details the case of an 11-year-old girl with APECED syndrome carrying a unique homozygous mutation in the AIRE gene, the first of its kind documented.

This study found that rhIL-15 promotes human hair follicle growth and regrowth in experimental settings and may have therapeutic potential for alopecia areata by restoring immune privilege guardianship.

This study found that AIRE, a usually nuclear protein, is expressed in the cytoplasm of human epidermal and follicular keratinocytes and associates with the intermediate filament protein cytokeratin 17, potentially impacting ectodermal abnormalities in APECED syndrome.

This review evaluates existing research on Keratin 15 to assess its validity as a marker for epidermal stem cells, reporting no new results.

This study found no significant association between the IL-15 genetic polymorphism (rs17015014) and the risk or severity of Alopecia Areata in the examined population.

This study suggests that rather than inhibiting IL-15, selectively stimulating IL-15Ra-mediated signaling could be beneficial for managing alopecia areata and possibly other inflammatory hair loss conditions, as IL-15 promoted hair growth and maintained immune privilege in human hair follicles.

This study found that elevated serum levels of IL-15 in active alopecia areata patients are correlated with disease severity, suggesting it plays a role in disease pathogenesis.

This case series found that patients with the NUDT15 415C>T variant experienced severe azathioprine toxicity, suggesting genotype-based dosing could reduce adverse effects.

This letter discusses azathioprine-induced alopecia and leukopenia potentially linked to NUDT15 polymorphisms, reporting no new clinical results.

This study found that keratin 15 lacks the ability to sequester YAP1 in keratinocytes effectively, unlike keratin 14, and suggests that a higher K15:K14 ratio may promote a progenitor state and inhibit differentiation in epidermal keratinocytes.

This study found that knock-down of keratin 15 in various cell lines affected cell spreading, morphology, migration, differentiation, and proliferation, suggesting its role in maintaining the stem cell nature of keratinocytes.

This study proposes a model suggesting that the ratio of keratin 15 to keratin 14 in epidermal keratinocytes promotes a progenitor state and opposes differentiation, based on insights from both cell culture and transgenic mouse models.