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This review discusses the role of intrinsic skin signals, rather than serum signals, in regulating melanin synthesis and hair pigmentation, but reports no new experimental data.

In this study, researchers found that p75 neurotrophin receptor signaling affects apoptosis during hair follicle regression in mice, and altering its activity might help manage disorders involving early catagen entry.

This study found that a novel peptide, FOL-005, derived from osteopontin, significantly inhibited hair growth in human hair follicles both ex vivo and in vivo, suggesting potential as a treatment for unwanted hair growth.

In this study, researchers found that stress likely triggers symmetrical alopecia in Formosan macaques in Mt. Longevity, Taiwan, with higher stress hormone levels associated with the condition.

This study found that ALRN-6924, a clinical-stage dual inhibitor, can selectively protect human scalp hair follicles from paclitaxel-induced toxicity and damage by inducing transient cell cycle arrest in healthy cells without affecting cancer cells, potentially reducing chemotherapy-induced alopecia.

BrdU speeds up hair follicle aging and reduces hair quality.

This study found that the natural estrogen Estetrol (E4) may promote hair follicle growth and prevent miniaturization, suggesting its potential as a treatment for hair loss disorders.

This study suggests that interleukin-15 plays a complex role in alopecia areata, potentially contributing to immune infiltration while also protecting against hair follicle immune privilege collapse and promoting hair growth.

This study found that the cosmetic olfactory receptor agonist cyclohexyl salicylate may stimulate hair growth and expand stem cell progeny, suggesting potential as a cosmetic adjuvant for hair loss.

This review discusses the potential of ginseng and its metabolites for treating hair loss and reports no new clinical findings.

This study suggests that in alopecia areata, innate lymphoid cells type 1 may contribute to the disease’s pathogenesis by inducing hair follicle changes similarly to CD8+ T cells.

This study found that the activity of CD73, an enzyme expressed in the hair follicle epithelium, may regulate human hair growth by modulating adenosine production.

This research reports a new autosomal recessive mutation in mice, 'lanceolate hair', causing generalized alopecia and hair shaft abnormalities, which may serve as a model for Netherton's syndrome in humans.

This study found that genes such as FGF5, FGFR1, and RRAS may impact the growth cycle of secondary hair follicles in Inner Mongolian Cashmere goats.

This chapter reviews the anatomy and physiology of hair follicles but reports no new research findings or clinical results.

This review assessed experimental studies on herbs used for alopecia, identifying potential mechanisms involving hair cycle management and keratinocyte processes, but highlighted a need for improved evidence on quality control and toxicity of these herbal treatments.

This review explores the complexity of the hair cycle and discusses the roles of various growth factors, androgens, and cytokines in regulating hair growth, yet reports no new results.

This study suggests that ADAM 10 and 12 proteases may play important roles in the regulation of hair cycling through their expression patterns in hair follicle structures.

In this study, researchers using a multi-omics approach identified specific proteins involved in the hair follicle cycle of Inner Mongolia Cashmere Goats, finding that API5 affects apoptosis, while ribosomal proteins are highly expressed during the resting stage, providing insights into hair follicle growth and apoptosis.

This review discusses the hormonal impact on hair growth and the relationship between endocrine disorders and hair changes, reporting no new clinical results.

This study found that finasteride and luteolin may prevent hair loss and promote hair growth in vitro and in vivo by modulating specific gene expressions related to cell differentiation and apoptosis.

This study found that in androgenetic alopecia patients, there is enhanced expression of type 2 TGF-β and type II receptors in hair follicles, suggesting a link to hair growth cycle changes.

This study found that increased expression of type 2 TGF-β and type II receptor was observed in the bald vertex area of hair follicles from androgenetic alopecia patients, suggesting a role in catagen induction.

This study in Italy observed telogen effluvium and trichodynia as common hair-related complications following COVID-19 infection, raising questions about underlying hair follicle biology and potential receptor involvement.

This study found that cyclosporine A stimulates hair growth in a mouse model by preventing catagen development and increasing expression of certain growth factors.

In Angora rabbits, overexpression of miR-129-5p was found to induce apoptosis and inhibit proliferation of dermal papilla cells, highlighting its role in hair follicle development by targeting HOXC13.

This study found that Korean Red Ginseng may protect against chemotherapy-induced alopecia by reducing hair follicle damage in a human hair follicle organ culture model.

This study found that keratin 17 and TNFα play interdependent roles in regulating hair follicle cycling, with TNFα required for the anagen–catagen transition and its ablation partially rescuing hair cycling defects in K17-null mice.

This study found that in mice, inactivating beta-catenin in the dermal papilla reduces hair follicle progenitor proliferation and disrupts the hair cycle.

In this study, Msx2-deficient mice showed progressive hair loss due to shortened anagen phase and prolonged catagen and telogen phases, resulting in cyclic alopecia with structurally abnormal hair shafts.