January 2022 in “Archiv für Tierzucht” This study found that EPHA4 and Ephrin A3 genes are differentially expressed during hair follicle development in fine-wool sheep, suggesting roles in follicle regeneration and density.
July 2026 in “Journal of the American Academy of Dermatology” Estetrol (E4) can help hair grow longer by extending its growth phase.
39 citations
,
November 2005 in “The journal of investigative dermatology/Journal of investigative dermatology” The study concluded that fatty acid transport protein 4 in epidermal keratinocytes is crucial for maintaining normal skin structure, as its deficiency led to hyperkeratosis and epidermal barrier disruption in mice.
16 citations
,
May 2000 in “Endocrinology” This study identified a new gene, mrp4, in mice, which suggests it may have a unique role in the growth and development of hair follicles in the ears and tails.
July 2024 in “Journal of Investigative Dermatology” ATR04-484 ointment shows promise for treating skin issues from cancer therapies.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” 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.
July 2026 in “Research Square” September 2025 in “Science Advances” This study reports that PADI4, an enzyme involved in posttranslational protein modifications, regulates progenitor cell transitions in hair follicle development by repressing transcription and interacting with translational and ribosomal processes.
July 2026 in “Journal of Investigative Dermatology” 85 citations
,
May 2009 in “Hippocampus” This study found that progesterone enhances the survival of newborn neurons in the hippocampus of adult male mice, which is associated with improved spatial learning and memory.
26 citations
,
January 2016 in “Annals of Dermatology” This study found that Ecklonia cava polyphenols increased human dermal papilla cell proliferation and extended hair shaft length in vitro and ex vivo, suggesting potential as a therapeutic candidate for hair loss.
January 2007 in “대한피부과학회지” In this clinical trial, the topical agent AP-FHG0604T significantly increased hair counts and growth rates in women with female pattern hair loss compared to a placebo, though some reported mild local irritation.
2 citations
,
December 2016 in “Experimental cell research” This study reveals that CSPG4-positive basal cell keratinocytes show distinct global gene expression from CSPG4-negative cells, despite similar colony-forming efficiency.
3 citations
,
July 2017 in “Journal of Investigative Dermatology” This study found that SSEA-4 is a marker that distinguishes eccrine from apocrine ductal cells in human sweat glands, suggesting its potential use in diagnostic applications.
4 citations
,
September 2020 in “PeerJ” This study found that platelet factor 4 in platelet-rich plasma suppresses human hair follicle growth and alters related gene expressions, suggesting potential implications for its use in hair loss treatment.
October 2023 in “Journal of the Endocrine Society” In this study, estetrol (E4) treatment was associated with increased hair growth in ex vivo human hair follicles, suggesting its potential as a treatment for hair loss disorders.
April 2019 in “Journal of Investigative Dermatology” This study found that DPP4 is significantly involved in matrix deposition and fibrosis in human skin fibroblasts, although the exact functions of DPP4 remain unclear.
8 citations
,
January 2017 in “Stem Cells International” This study found that overexpression of sFRP4 in skin cells reduces Wnt signaling activation, leading to decreased melanocyte differentiation in regenerating hair follicles.
September 2019 in “The journal of investigative dermatology/Journal of investigative dermatology” This study identifies two previously unreported pathogenic RIPK4 gene variants, suggesting a functional link with cell adhesion molecules in ectodermal dysplasias.
January 2018 in “Springer eBooks” PDE inhibitors, especially PDE4 inhibitors like apremilast, are effective for certain inflammatory skin conditions but have side effects and can be costly.
September 2019 in “Journal of Investigative Dermatology” This study observed that PCE-DP may improve skin pigmentation by increasing epidermal turnover and inhibiting melanin uptake and inflammation in human epidermal keratinocytes.
117 citations
,
April 2008 in “Developmental biology” This study identified that Eda-A1 unexpectedly induces placode inhibitors dkk4 and lrp4, indicating the importance of tightly regulated signaling for proper ectodermal organ development.
2 citations
,
July 2005 in “International Joint Conference on Artificial Intelligence” This study suggests that EREG, released from ORS cells, may promote hair growth by activating specific receptors and modulating ROS generation, offering a potential new treatment for hair loss.
January 2010 in “Acta Universitatis Medicinalis Nanjing” This study found that progesterone increased the survival of newborn neurons and enhanced spatial learning and memory in adult male mice, independent of neuron production changes.
9 citations
,
October 2015 in “Journal of Cutaneous Pathology” This study found that histopathologic features of erythematous papulopustular eruption due to EGFR inhibitors vary with eruption severity and differ between cetuximab and erlotinib treatments.
2 citations
,
January 2018 in “Biomolecules & therapeutics” This study found that polyamidoamine dendrimers can permeate skin's current conducting pores and alter the magnitude and direction of electroosmotic flow, affecting drug flux during iontophoresis.
18 citations
,
July 2016 in “Genetica” This study found that in Liaoning cashmere goats, the BMP4 gene shows increased transcription from the anagen stage to telogen, and higher gene methylation correlates with reduced expression in skin tissue.
July 2026 in “bioRxiv (Cold Spring Harbor Laboratory)” This study identified a new FAK isoform, FAKΔe4, which is regulated by ECM stiffness and affects cell migration, invasion, and mechanosensing in human-derived data and engineered models.
November 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that cPPARγ and dnPPARγ isoforms are differentially expressed in healthy human skin, suggesting that PPARγ modulators may have compartment-specific effects depending on isoform presence.
April 2016 in “Journal of Investigative Dermatology” This study found that the peptide derivative beta-Ala-Pro-Dab-NHbenzyl may reduce wrinkles and sebum production in human skin by inhibiting dipeptidyl peptidase 4, suggesting potential for acne and skin inflammation treatment.