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Macrophages help break down collagen around hair follicles during hair growth.

This study observed that the ontogenetic transition from scarless repair in early fetal rat wounds to scar-forming repair in late gestation is associated with differential TGF-β ligand and receptor expression patterns.

This review explores the physiological roles of collagen XVII in the epidermis, its involvement in stem cell maintenance, and its connections with signaling pathways, but it reports no new results.

This study concluded that the 800-nm diode laser is effective in enhancing skin structure and collagen expression via the TGF-β/Smad pathway, suggesting potential for non-ablative rejuvenation.

This study found that human adipose-derived stem cells co-cultured on a collagen sponge scaffold showed increased differentiation into keratinocytes, suggesting potential for improved skin wound healing.

This study found that hydrogels supplemented with fractionated platelet-rich plasma recruited more dermal-derived stem cells and accelerated healing, leading to hair growth and skin regeneration in rats.

This study found that Gelatinase A activity is linked to the absence of type VII collagen during human fetal skin development, indicating its role in remodeling the basement membrane zone.

Minoxidil affects collagen-related genes, potentially helping treat fibrosis.

This study suggests that the absence of alpha5(IV)/alpha6(IV) chains in certain subepidermal basement membrane spots may relate to interactions with melanocytes in human skin.

In this study, a new apple stem cell extract serum significantly improved signs of skin aging and enhanced cell metabolism in human senescent fibroblasts, showing visible effects after one week of use.

This study found that dermal papilla cells in culture may enhance and attract follicular epithelial cell growth, suggesting their pivotal role in hair and follicle development.

This research found that hyaluronic acid increased cell proliferation and type I collagen more effectively than poly-L-lactic acid in both human fibroblast cultures and rat dermis.

This study found that collagen VI influences hair follicle growth and wound-induced regrowth by activating the Wnt/β-catenin signaling pathway in mice, suggesting potential therapeutic targets for hair loss.

This study presents a method using polarization-sensitive optical coherence tomography to accurately assess the depth of burn wound damage in the dermal collagen matrix, potentially improving diagnosis beyond traditional visual methods.

In a study using a mouse model of diabetes, chitosan-based hydrogels increased healing markers and improved wound closure and tissue repair compared to untreated wounds, but human efficacy needs further validation.

This study found that in a rat skin model, fat cells inhibited the proliferation of organoid hair follicle cells and fibroblasts but may have accelerated hair follicle cell differentiation.

This study reports that transplantation of an ESCs-collagen-chitin biomimetic membrane leads to successful in situ skin regeneration, including hair follicle cell proliferation and formation of dermatoglyphs, in nude mice with full-thickness skin defects.

This study found that the collagen-binding fusion protein PTH-CBD significantly improved hair regrowth and follicle health in mice after chemotherapy, suggesting potential as a therapy for chemotherapy-induced alopecia.

This study found that PCL-Col/ZnO fibrous scaffolds enhanced wound healing and exhibited antibacterial properties, making them promising for use as a wound dressing.

In this study, CD109 overexpression in transgenic mice led to reduced inflammation and improved collagen organization during wound healing without affecting wound closure.

This research found that immobilizing type I atelocollagen onto artificial hair significantly improved the adhesion and long-term fixation of the hairs in the human scalp, indicating high biosafety and enhanced tissue integration.

This study found that PES1CMU-defatted rice bran (DFRB) showed effective skin whitening and anti-aging properties comparable to standard treatments in cell models, suggesting its potential use in dermatocosmetics.

This study found that keratinocytes show increased expression of the TGF-β system and collagen type I with age, suggesting a heightened profibrotic response during skin differentiation associated with scarring.

This study found that collagen remodeling is more active in anagen-stage skin than in telogen-stage skin in mice, suggesting that collagen modifications may support hair follicle growth and migration.

This study reported that a newly developed hydrogel composed of recombinant type I collagen and chitosan, incorporating a metal–polyphenol structure, demonstrated strong mechanical and healing properties, effectively promoting wound healing in a full-thickness skin defect model.

PTH-CBD helps reduce hair loss in mice by stimulating hair growth directly.

This study found that TGF-β2 may enhance collagen expression and spheroid formation in human dermal papilla cells, which could improve their hair inductivity and maintenance.

In this study, oral collagen peptides increased certain gene expressions related to epidermis development and the hair cycle in hairless mice skin, suggesting potential links to hair health.

This article reviews how aging affects skin and stem cells, but it contains no new research findings.