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This article reviews the molecular interactions involved in hair follicle cycling and highlights the role of dermal papilla cells, but it presents no new research findings.

This study found that subcutaneous administration of conditioned medium from adipose-derived stem cells promoted hair growth in mice, and hypoxia enhanced this effect by altering growth factor secretion.

This study found that procyanidin oligomers, particularly dimers and trimers, significantly promoted hair growth in mice and hair epithelial cell cultures, suggesting potential use as hair growth agents.

This study found that p53 plays a crucial role in regulating apoptosis during hair follicle regression (catagen) in mice, and its absence leads to delayed progression and altered expression of apoptosis-related markers.

This study found that cyclosporin A treatment enhances hair growth in mice by inhibiting calcineurin-NFAT1 activity, which alters keratinocyte differentiation and apoptosis-related gene expression in hair follicles.

This study found that phosphatidic acid promotes hair growth by stimulating cell proliferation and protecting against apoptosis in murine hair epithelial cells, unlike lysophosphatidic acid, which showed limited effects.

This study indicates that Fructus panax ginseng extract may promote hair growth by increasing proliferation in human hair dermal papilla cells and lengthening the anagen phase in mice.

This study suggests that different melanocyte subpopulations in hair follicles have varying patterns of apoptosis and survival during the catagen phase, which may inform models for modulating melanocyte behavior in vivo.

This study found that IGF1, retinoic acid, and dexamethasone increase IGFBP-3 production in cultured human dermal papilla cells, potentially inhibiting IGF1 action on hair growth.

This study found that red ginseng oil and its major components improved hair regrowth in testosterone-treated mice by promoting an earlier anagen phase and altering related gene expressions.

This study found that arachidonic acid may promote hair growth by enhancing dermal papilla cell function and stimulating the anagen phase in C57BL/6 mice.

This study suggests that type IV collagenases, MMP-2 and MMP-9, play important roles in the hair cycle by regulating the expression of VEGF, IGF-1, and TGF-β in mice.

This study found that manipulating prolactin levels in New Zealand Wiltshire sheep induces wool follicle growth cycles, revealing gene expression changes that suggest roles for specific genes in follicle function.

This study found that 6-gingerol, a component of ginger, suppresses hair growth rather than promoting it, both in vitro and in vivo, suggesting potential use in hair removal treatments.

This study found that the humanin analogue HNG significantly promoted hair growth in vitro and in vivo by prolonging the anagen phase and inhibiting hair follicle cell apoptosis in mice.

This study found that mirex and TPA promote papilloma formation in CD-1 mouse skin through distinct populations of mutant Ha-ras cells, resulting in additive tumor yields.

This study found that Rumex japonicus Houtt. root extract promoted hair growth by enhancing cell proliferation and preventing apoptosis in human dermal papilla cells and HaCaT cells, as well as in a mouse model.

This study found that the methanolic extract of Carthamus caeruleus roots significantly reduced inflammation, promoted wound healing, and enhanced hair growth in experimental models, supporting its traditional use in Northern Algeria as a skincare remedy.

This study found that alopecia areata is linked to genetic factors, specifically HLA haplotypes on chromosome 6, and involves immune privilege collapse at hair follicles which is mediated by the JAK-STAT pathway and pro-inflammatory cytokines like IFN-γ.

In this study, norgalanthamine was found to stimulate hair growth in cultured rat dermal papilla cells by activating the ERK 1/2, PI3K/AKT, and Wnt/β-catenin signaling pathways.

This study found that Crataegus pinnatifida extract promoted hair growth in mice by inducing the anagen phase, potentially through activating signaling pathways that enhance cell survival.

This study found that ornithine decarboxylase (ODC) may play a significant role in regulating human hair growth and hair cycle changes, as inhibiting ODC reduced follicular keratinocyte proliferation and human hair growth.

This study identified key proteins, FKBP10 and FBN2, that promote the growth cycle of secondary hair follicles in cashmere goats, with higher expression in the anagen phase, offering insights into mechanisms potentially enhancing cashmere yield and quality.

In this study, researchers observed that metabolite expression patterns, including sugars, lipids, amino acids, and nucleotides, affect hair follicle growth in cashmere goats, with feeding practices potentially influencing these cycles via hormone and vitamin levels.

This study investigated how different 3D bioprinted scaffold structures affect immune responses and hair growth in mice, finding that moderate immune response induced by certain structures stimulates hair growth, while excessive immune response can hinder hair follicle development.

In this study of Angora goats, researchers found that HOXC13 and other genes were overexpressed during the active hair growth phase, suggesting a role in mohair structure.

This study found that overexpression of the anti-apoptotic protein Bcl-2 in mice disrupted cell death during the hair cycle, impairing hair regeneration by delaying anagen entry and hair growth.

This study found that citron seed oil promotes hair regrowth in a C57BL/6 mouse model by enhancing the transition to the growth phase, increasing hair follicle features and skin thickness, and inducing specific protein expressions that support hair regeneration.

This study found that the application of polyunsaturated fatty acids, particularly arachidonic acid, promoted hair growth and anagen induction in both human dermal papilla cells and mouse models.

This study observed that applying a GMP-grade botanical extract to the scalp increased Bcl-2 levels, potentially preventing premature hair follicle apoptosis in chemotherapy and radiotherapy-induced alopecia.