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This chapter reviews the basic physiology and causal mechanisms of hair follicle disorders, but it reports no new clinical results.

This study found that 4-aminopyridine significantly enhanced skin wound healing by accelerating wound closure, improving skin architecture, and promoting hair follicle neogenesis and tissue regeneration.

This study found that 4-aminopyridine significantly improved skin wound healing by enhancing wound closure, tissue regeneration, and cellular interactions involved in repair processes.

This study found that 4-aminopyridine, a potassium channel blocker, greatly improves skin wound healing by accelerating wound closure, enhancing tissue regeneration, and promoting hair follicle neogenesis.

This study found that 4-aminopyridine significantly improves skin wound healing by enhancing various cellular and molecular processes, suggesting its potential for rapid translational development in wound treatment.

This review suggests that platelet-rich plasma therapy shows promise for androgenetic alopecia and may be effective for some alopecia areata and cicatricial alopecia cases, but more robust trials are needed.

This study suggests that 4-META resin may be more effective than cyanoacrylate for promoting wound healing in rats, as the wounds were covered by epithelial tissue faster with 4-META resin.

This study suggests that the hair growth-promoting effects of 4-O-methylhonokiol may be linked to its ability to modulate TGF-β-induced cell cycle arrest and oxidative stress in HaCaT cells.

This study reports an improved and more cost-effective 7-step synthesis method for finasteride with an overall yield of 20.01%.

This research outlines a chemical synthesis process for Finasteride, detailing the conversion of pregnadienolone acetate through various chemical reactions and modifications.

Testosterone, 4-hydroxyandrostenedione, and finasteride affect blood clotting differently in stressed heart conditions.

High blood pressure drugs often cause skin lupus, stopping the drug usually helps. A vaccine helps prevent genital herpes and HPV-16. More frequent light therapy clears psoriasis faster. No link was found between low iron and chronic hair loss.

This summary offers an overview of selenium's forms, its biological roles, and dietary sources, but reports no specific research findings.

This study reports the development of novel 4-amido-Δ4,6-steroids as potential inhibitors of 5α-reductase, showing promising in vitro results for conditions like acne and benign prostatic cancer.

This study found that 4-(ethoxycarbophenyl) retinamide (RI) exhibited significantly lower acute, subacute, and chronic toxicity compared to other retinoids in mouse and rat models.

This study suggests that fibroblast growth factors FGF-4, FGF-8, and FGF-9 may play redundant roles as signals in epithelial-mesenchymal interactions during multiple stages of tooth development in mice.

This study found that the Wnt inhibitor Dkk4 may play a role in regulating hair follicle development through a feedback loop with canonical Wnt signaling pathways.

Mutations in the DSG4 gene cause specific hair and scalp issues.

This study identified novel compound heterozygous mutations in the DSG4 gene in a Japanese patient with congenital hypotrichosis, suggesting overlap between localized autosomal recessive hypotrichosis and monilethrix.

This study identified a missense mutation in the rat Desmoglein 4 gene, causing abnormal hair shaft development in lanceolate hair mutant rats by disrupting a critical calcium binding site.

This study suggests that the interaction between folliculin and plakophilin-4 (p0071) may play a role in folliculin's tumor suppressor function by regulating RhoA signaling, impacting cell migration and junction formation.

A gene deletion in DSG4 causes sparse hair in some Pakistani families.

This study found that treatment with the polyphenolic compound TCQA activated β-catenin, promoting hair regrowth and the initiation of the anagen phase in mice and human dermal papilla cells.

This study found that intron 3 VNTR polymorphism in the IL-4 gene may be associated with an increased risk of alopecia areata in the Turkish population.

In this study, photodynamic therapy significantly reduced inflammatory acne lesions and sebum secretion, possibly by inducing apoptosis in sebaceous glands and down-regulating TLR-2 and TLR-4 expression.

Early diagnosis and treatment of TPP can prevent complications.

This study found that transcription factors HOXC13, LEF1, and FOXN1 repress DSG4 transcription, with the Notch pathway possibly involved in maintaining DSG4 expression in hair follicles.

This study found that overexpression of neurotrophin 4 in mouse skin increased hair follicle and Meissner corpuscle innervation without altering sensory neuron numbers, differing from brain-derived neurotrophic factor by not affecting Merkel cell numbers.

A specific gene mutation causes sparse, brittle hair in a family.

This study found that the loss of Smad4 in keratinocytes reduces Dsg4 expression via disrupted BMP signaling, contributing to hair follicle degeneration and alopecia.