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This review synthesizes existing research on the multilayered defense system of the skin, highlighting how physical, chemical, immune, and microbial barriers work together to maintain skin health, with disruptions in one often leading to broader barrier dysfunctions.

This study found that external and internal luteolin treatments reduced hair graying in model mice by mitigating age-related dysfunction in hair stem cell signaling, suggesting potential practical applications for anti-graying treatment in humans.

This study found that keratin 17 expression is initially down-regulated and later strongly up-regulated by ionizing radiation in a rat model, with p53 repressing early transcription.

This meta-analysis found that ADSC-Exo therapy can enhance healing in both general and diabetic wounds by promoting neovascularization, improving epithelization and collagen fiber deposition, and reducing scar formation, suggesting significant potential for clinical and research applications.

This study found that implanting hair-follicle-associated pluripotent stem cell sheets in mice significantly accelerated wound closure and reduced scar formation compared to non-implanted controls.

This study demonstrated that engineered exosomes carrying EGF and FGF restored hair density and follicle integrity in an androgenetic alopecia mouse model by reactivating hair follicle growth factors, offering a novel therapeutic approach without immunogenic reactions or systemic toxicity.

This study found that wounds in sheep treated with mesenchymal stem cells and platelet-rich plasma showed improved healing, reduced inflammation and contraction, and better skin structure compared to untreated wounds.

The research shows a potential way to regenerate hair using adult cells that have been grown and guided to produce new hair fibers.

This review covers advancements in skin repair and rejuvenation technologies, highlighting potential benefits of stem cell therapy, bioengineered skin substitutes, PRP, exosome therapies, and gene editing for conditions such as chronic wounds and genetic disorders, though challenges in accessibility, safety, and long-term effectiveness remain.

This study found that mouse embryonic fibroblasts better supported the growth and maintenance of LGR5+ epidermal stem cells compared to porcine fetal fibroblasts, under various culture conditions.

This article discusses the concept of hair cloning through cultured follicular cell implantation but provides no new experimental results; it highlights ongoing interest among hair restoration professionals and the public.

This source reviews the potential of 3D printing, biomaterials, and smart sensors in tissue engineering, noting their application in creating artificial membranes for skin and tissue regeneration and assessing their strengths and limitations for wound dressing development and disease modeling.

This review outlines the potential of using human pluripotent stem cells for hair follicle bioengineering, detailing current HF morphogenesis and cycling knowledge, various cell sources, and strategies using iPSCs, while discussing the challenges and prospects for therapeutic use in addressing hair loss.

In this study, researchers successfully derived skin organoids from mouse pluripotent stem cells that spontaneously produce hair follicles, potentially aiding in hair growth research and in vitro drug testing.

This review discusses the challenges of skin graft acceptance and examines current strategies and alternatives for full-thickness skin replacement and repair, noting that immunological rejection remains a significant hurdle.

In this review, bioengineered materials incorporating growth factors and cytokines were reported to enhance wound healing by sustaining drug delivery, reducing dosage, and minimizing side effects compared to traditional treatments.

This study demonstrated that cultured epidermal stem cells and skin-derived precursors can regenerate functional hair follicles and sebaceous glands in both mice and adult humans, suggesting potential for bioengineered skin substitutes.

This review discusses various gene therapy and non-viral delivery methods to promote angiogenesis for chronic wound healing, but it reports no new clinical results.

This review discusses the current state of research on skin organoids, highlighting their potential for replicating complex skin structures and comparing recent studies on stem cell microenvironments.

This review describes recent advances in the study of epidermal stem cells and their importance in regenerative medicine and skin tissue engineering, but provides no new clinical results.

This study reviews advancements in hair follicle regeneration, discussing the benefits and limitations of methods such as organ germ assembling, stem cell induction, and bioprinting, while highlighting the challenges of replicating embryonic signals and finding suitable cell sources for clinical applications.

This study demonstrated a novel use of tape stripping on a human skin model to simulate the inflammation and barrier damage caused by dry razor shaving, highlighting potential shaving and skin-care formulations that may mitigate such damage.

This chapter reviews the potential of stem cells from discarded deciduous teeth in regenerative medicine and dentistry, with no new clinical results presented.

This review discusses the role of dermal cells in hair follicle regeneration and morphogenesis and highlights their potential therapeutic implications, but it reports no new empirical findings.

This review synthesizes current advances in transcriptomics and RNA regulatory networks, alongside stem cell-derived skin organoid research, to propose a conceptual framework for understanding and potentially guiding regenerative skin repair, without claiming clinical readiness.

This study demonstrated how cellular flows and tissue mechanics guide the topological transformations in avian skin, essential for feather follicle development from scales.

This study reported that a new formulation of finasteride solid lipid nanoparticles, combined with LPC and NTC, enhanced hair growth in mice without visible skin reactions, suggesting it could effectively manage androgenetic alopecia.

The study found that bioengineered hair follicles work when using cells from the same species but have issues when combining human and mouse cells.

This review discusses the potential of organoids in modeling COVID-19 disease and developing therapies, without reporting new results, and highlights opportunities and challenges in their application for research.

In this study, a bioengineered construct using a biodegradable polycaprolactone mat cocultured with human keratinocyte and rabbit dermal fibroblast cells demonstrated potential as a tissue-engineered skin substitute, showing good cell adhesion and growth.