Tissue Mechanics in Haired Murine Skin: Potential Implications for Skin Aging

This review explores the cellular and molecular basis of wound-induced hair neogenesis and its relationship with aging but does not report new clinical results, highlighting areas for future research.

This study found that sympathetic nerves and arrector pili muscles form a niche that modulates hair follicle stem cell activity, revealing their role in hair follicle regeneration.

This study found that mature dermal adipocytes have high plasticity, undergoing dedifferentiation and redifferentiation, which plays a significant role in hair cycling and wound healing.

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 study explored the regenerative abilities of the African spiny mouse's skin, revealing more robust wound-induced hair follicle neogenesis compared to laboratory mice and highlighting unique features of its hair and wound response.

The authors concluded that dermal white adipose tissue, influenced by factors like light irradiation, plays a significant role in modulating hair follicle cycles and could be targeted for hair growth treatments.

This review discusses the cosmetic and nutricosmetic efficacy of hyaluronic acid for skin rejuvenation and reports that HA formulations show remarkable anti-aging properties.

This study suggests that age-related changes in skin elasticity reduce its stability against wrinkling, and anti-aging strategies should focus on addressing elastic mismatches between skin layers.

This review discusses the role of mechanical forces in skin homeostasis and disease development, including their impact on conditions like keloids, androgenetic alopecia, and acral melanoma, and reports no clinical results; the authors propose modifying these forces as a potential therapeutic strategy.

This review suggests that PRP injections may be effective in promoting hair regrowth, reducing hair loss, and increasing hair thickness in patients with androgenic alopecia.

In this study, Japanese patients treated with adipose-derived stem cell-conditioned medium for hair regeneration showed positive outcomes, suggesting it may be an effective new therapy for alopecia.

This review found that the current evidence on using platelet rich plasma to treat non-cicatricial alopecia, such as androgenetic alopecia and alopecia areata, is of low quality and yields controversial results.

This study observed that autologous platelet-rich plasma treatment improved hair count and density in areas with androgenetic alopecia compared to placebo, with differing outcomes based on the PRP collection device used.

This review discusses the role of Foxc1 and type XVII collagen in hair follicle stem cell quiescence and aging, identifying mechanisms that relate to hair thinning and hair loss, and reports no new results.

The document concludes that both internal stem cell factors and external influences like the environment and hormones affect hair loss and aging, with potential treatments focusing on these areas.

This research found that Foxc1 transcription factor and COL17A1 are critical in regulating quiescence and hair thinning in hair follicle stem cells, with aging-related DNA damage leading to hair loss.

This review discusses how macro-environmental factors such as intradermal adipose tissue and sex hormones influence hair and feather stem cell niches, suggesting environmental targets for regenerative medicine, but reports no new clinical results.

This study found that patterned hair plucking in mice triggers a collective regeneration response in nearby unplucked hair follicles via a quorum sensing mechanism involving immune signaling.

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.

In this study, PRP injections increased hair count and reduced hair loss in patients with androgenic alopecia not responding to minoxidil and finasteride, with high patient satisfaction reported.

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 reports the first instance of skin autotomy in mammals, specifically in African spiny mice, and suggests they may possess a greater regenerative capacity than previously understood, possibly offering insights for regenerative medicine.

This study found that autologous platelet-rich plasma increased hair growth potential by enhancing dermal papilla cell proliferation and stimulating key signaling pathways in both cell cultures and mice models.

This review discusses the multiple layers of environmental controls on hair stem cell homeostasis and suggests that targeting these layers could offer safer regenerative medicine therapies without directly using stem cells.

Nephronectin helps attach muscle cells to hair follicles.

This study found that androgenetic alopecia may involve a defect in the conversion of hair follicle stem cells to progenitor cells, as demonstrated by a reduced presence of progenitor cells in bald scalp samples.

This study found that both genetic and environmental factors influence appearance-related aging in women, with skin wrinkling, hair graying, and sun damage significantly affecting perceived age more than chronological age.

TRPV1 helps regulate hair growth cycles.