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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 observed that during the rat hair cycle, DNA synthesis in dermal cells peaks during a specific growth stage, suggesting a coordinated metabolic activity with potential implications for alopecia areata research.

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 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 aging mice with an epidermal deletion of DNA methyltransferase 1 had a reduced number of hair follicles, due to decreased stem cell activation probability.

Activating cAMP and ATP improves hair growth and strength.

This study found that miR-148a plays a significant role in regulating skin homeostasis and hair follicle cycling, influencing stem cell activity and development in mice.

Androgens reduce hair growth by affecting cell differentiation and blood vessel formation.

In this study using a mouse model with alopecia areata, the researchers found that ruxolitinib enhances hair regrowth by inhibiting the JAK-STAT signaling pathway, reducing inflammation and oxidative stress, and decreasing apoptosis, which supports its clinical effectiveness in treating this condition.

In this study, heparin was found to exert dose- and hair cycle-dependent effects on skin epithelial cells in mice, affecting hair follicle development and protein synthesis differently based on its administration method.

This study found that fermented Morinda citrifolia extract enhances the viability and cycle progression of human dermal papilla cells and promotes hair growth through Wnt/β-catenin signaling activation, suggesting its potential as a therapeutic candidate for alopecia.

Prostaglandin helps regenerate hair follicles after radiation damage.

This study suggests that age-related regenerative decline in hair follicles may be due to an imbalance of signals affecting stem cell activation, with follistatin potentially promoting renewal.

This study found that aging mice experience slower and more fragmented hair cycle waves, but transplanting aged skin to a young host can partially restore hair cycling, implicating extracellular factors.

This study found that transgenic mice overexpressing the BMP antagonist noggin showed increased hair follicle size and altered hair type, linked to changes in cell proliferation and gene expression.

This study found that rhamnose can restore hair-inducing gene expression in dermal papilla cells and accelerate hair follicle regeneration by promoting the hair cycle into the anagen phase, suggesting its potential therapeutic application for alopecia treatment.

This study found that in immunodeficient mice lacking T cells, certain innate lymphoid cell subsets increased and influenced the hair growth cycle, with specific ILC subsets shown to promote anagen, the active phase of hair growth.

This study found that ginsenoside Rb1 treatment significantly reduced aging symptoms in mice by regulating cell cycle and apoptotic pathways, potentially linked to metabolic changes.

This article lists online educational resources from the American Society of Plastic Surgeons but reports no new research findings.

This study found that deleting all three Tet genes in mice led to shorter hair shafts and altered hair types, with associated changes in gene expression and DNA hydroxymethylation.

This review discusses the potential role of extracellular vesicles in modulating hair follicle dynamics and reports no new clinical results; future investigations may inform treatment strategies for skin disorders.

In this study, researchers found that DNMT1-mediated methylation of SRD5A2 in urethral epithelial cells from hypospadias-afflicted rats upregulates proteins associated with cell cycle and mitochondrial function, suggesting SRD5A2 as a potential therapeutic target for hypospadias due to its role in modulating cellular functions.

This study found that ocu-miR-205 influences hair follicle density in Rex rabbits by promoting dermal papilla cell apoptosis and transforming hair follicles from growth to resting phases through signaling pathway modulation.

This study suggests that miR-486 may protect against alopecia areata by maintaining hair follicle immune privilege and modulating expression of immune-related genes.

This review discusses the multifaceted role of vitamin D in the body, noting its influence on calcium balance, hair cycle maintenance, cell proliferation, cardiovascular function, and immune modulation, with no new clinical results reported.

This study reviewed current scientific evidence on the use of exosomes for treating alopecias, finding they may stimulate dermal papilla cell proliferation and modulate inflammation, though challenges in standardization and long-term efficacy remain.

This study reported that human umbilical cord mesenchymal stem cell-derived exosomes may promote hair regeneration and thickness in androgenic alopecia by modulating cellular pathways in hair growth, including increasing hair density and diameter, as observed in a mouse model and an exploratory clinical trial.

This study found that intra-follicular Wnt signaling and dermal BMP signaling oscillate differently during hair cycling in mice, affecting hair wave propagation and phases of hair growth.

This study found that basal cell carcinoma cells differentiate along hair follicle lineages and may be influenced by hair follicle cycle modulators for potential therapeutic targeting.

This study found that while clinical evidence is limited, early preclinical results suggest exosome treatment may enhance hair growth and warrant further research for therapeutic use in alopecia.