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This review discusses recent advances in hair follicle biology, regeneration, and tissue engineering, highlighting emerging therapeutic opportunities, and reports no new experimental results.

This study found that TLR2 and its ligand CEP are crucial for maintaining hair follicle health and stimulating hair growth, with deficiencies observed in aging and obesity potentially reducing regeneration.

In this study, researchers found that coordinated intercellular Ca2+ signaling among basal stem cells in mice is crucial for cell cycle progression and tissue-wide communication during epidermal regeneration.

This review highlights surprising similarities between hair follicles and antler units, suggesting that a comparative study of their biology could benefit understanding in both areas without presenting new empirical findings.

This study found similarities in the regeneration processes of MRL mouse ears and axolotl limbs, involving G2 cell cycle arrest and nerve-dependent mitosis, but the role of p21 in axolotl limb regeneration remains uncertain.

This study found that TLR2 expression in hair follicle stem cells is crucial for hair follicle maintenance and regeneration, with TLR2-dependent activation potentially offering new therapeutic approaches for hair loss prevention through mechanisms involving immune pathways and CEP administration.

This study found that TLR2 is crucial for maintaining hair follicle health and regeneration, and its stimulation by the metabolite CEP may promote hair growth, while decreases in TLR2 and CEP in aging and obesity may hinder hair growth.

This review discusses how inflammation influences hair follicle stem cell activities like wound healing and follicle cycling and suggests a potential link between inflammation, stem cell activation, and programmed cell death.

This study found that STAT5 activation and Sox18 are key in regulating hair follicle induction and cycling, while transducing SKPs with active STAT5B improved wound healing by reducing inflammation.

In this study, γ-ray exposure in mice decreased hair follicle density and pigmentation, suggesting damage to stem cells affecting hair follicle regeneration.

This study found that TLR2 in hair follicle stem cells is crucial for maintaining hair health and regeneration, and its decrease in aging and obesity may impair hair growth, suggesting that stimulation through its ligand carboxyethylpyrrole could offer new therapeutic avenues.

This study suggests that gamma-ray irradiation affects hair follicle density, structure, and pigmentation in mice, with some changes observed in later hair cycles.

This review of murine studies reports that γ-rays affect hair follicle pigmentation in mice throughout the hair cycle, while effects on hair structure may be obscured by aging.

This study observed distinct sex differences in hair growth cycles and regeneration in C3H/He mice, noting that females regenerated hair faster after adhesive material application, whereas males were more reliant on macrophage activity for this process.

In this study, researchers observed that deleting the Gpr54 gene accelerated the hair cycle and enhanced hair regeneration in mice by modifying the NAFTc3-SFRP1-Wnt signaling pathway, suggesting Gpr54 as a potential target for hair loss treatments.

This study identified a specific subpopulation of hair follicle stem cells in mice and humans that are essential for long-term hair regeneration, highlighting the potential for regenerative therapy.

In this study, researchers developed a drug-free microneedle patch using chitosan lactate and stem cell-derived exosomes that significantly promotes hair regeneration in animal tests compared to minoxidil, highlighting its potential as a simple and efficient hair loss treatment.

In this study, γ-ray irradiation of mice reduced hair follicle density and pigmentation, suggesting damage to stem cells and progenitors for keratinocytes and melanocytes.

In this study, γ-ray irradiation in mice during the first telogen phase led to decreased hair follicle density and pigmentation anomalies, suggesting damage to stem cells and progenitors for keratinocytes and melanocytes.

This review explores the regenerative potential of hair follicles and their role in complete skin regeneration, emphasizing the influence of mechanical factors and niche signaling pathways on hair growth and loss.

Different types of stem cells and their environments are key to skin repair and maintenance.

This study found that mechanical skin stretching can stimulate hair stem cell proliferation and hair regeneration by activating a complex pathway involving WNT, BMP-2, and M2 macrophages.

This article explores the dynamic and energy-efficient nature of telogen hair follicles, challenging the notion of dormancy, and highlights their potential in advancing treatments for hair growth disorders.

This study found that lymphatic vessels play a crucial role in hair follicle growth and regeneration in mice by connecting hair follicles and expanding during stem cell activation.

This study found that sFRP4 inhibits but does not block hair follicle regeneration in mice, suggesting a potential role in treating hair follicle regeneration disorders.

This study found that activating Wnt/beta-catenin signaling in hair follicles is sufficient to induce adipocyte generation in the dermis, affecting both hair follicle stem cell activation and adipocyte differentiation.

This study found that hair follicle stem cells are stiff with high actomyosin contractility, while hair germ progenitors are soft and enlarge during quiescence, influencing hair regeneration; inducing miR-205 reduces contractility and activates regeneration in mice.

This study reviews the development of a mouse model using pyroxylin to induce localized hair growth and shorten the hair cycle's resting phase, suggesting it as a platform for evaluating hair growth treatments, though further research is needed for human application.

This study found that inducing miR-205 reduces actin contractility and stiffness in hair follicle stem cells and progenitors, stimulating hair regeneration in both young and old mice.

This study found that in mice, inactivating beta-catenin in the dermal papilla reduces hair follicle progenitor proliferation and disrupts the hair cycle.