60 citations
,
December 2003 in “Journal of Investigative Dermatology” This study found that keratin 6hf, a type II keratin, is expressed in specific regions of mouse and human hair and suggests potential interactions with keratin 17, impacting hair development and associated disorders.
90 citations
,
August 2004 in “Physiological Genomics” This study found that coculturing human hair follicle keratinocyte stem cells with dermal papilla cells increased expression of the hair-specific keratin 6hf gene, which requires β-catenin/lef-1 signaling for hair differentiation.
2 citations
,
January 2011 in “Dental Medicine Research” This study suggests that Keratin 6hf may be a potential marker of oral squamous cell carcinoma and could play a role in its progression, though further research is needed to understand its function.
1398 citations
,
May 2008 in “Histochemistry and Cell Biology” This review summarizes the cell type distribution and functional significance of human keratins, emphasizing their roles in tumor diagnosis and potential clinical applications, and reports no new clinical findings.
99 citations
,
July 2012 in “PLoS Genetics” This study identified a 69 bp deletion in the KRT75 gene as the cause of the frizzle feather trait in chickens, affecting feather curling.
87 citations
,
July 2009 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that beard hair medulla cells express an unexpected range of keratins, showing variability and promiscuous behavior in keratin interactions distinct from other hair follicle cells.
70 citations
,
December 2004 in “Differentiation” This study identifies six novel keratin genes from the chromosome 17q21.2 region, suggesting their association with hair follicles, while all 27 keratin genes in the domain have been characterized transcriptionally.
54 citations
,
November 2015 in “Methods in enzymology on CD-ROM/Methods in enzymology” This chapter reviews keratins in skin epithelia, including their roles in cellular function and disease, and reports no new experimental results.
April 2018 in “D-Scholarship@Pitt (University of Pittsburgh)” This study found that keratin-75, discovered in enamel tissue, is secreted by ameloblasts using an unconventional pathway involving the ER-Golgi-Intermediate-Compartment and Golgi, differing from typical cytokeratin localization.
18 citations
,
October 2018 in “Nutrients” This study found that Annurca apple polyphenolic extracts reprogram hair follicle metabolism in mice, enhancing mitochondrial activity and keratin production while inhibiting some metabolic pathways.
42 citations
,
February 2021 in “Signal Transduction and Targeted Therapy” This review discusses potential cell sources and bioengineering strategies for regenerating hair follicles with functional cycling, reporting no new results.
45 citations
,
December 2007 in “The FASEB journal” This study demonstrated that hair follicle bulge stem cells can form epidermis in a tissue-engineered skin model, highlighting the significance of K5/K17 filaments in slow-cycling stem cell subsets.
38 citations
,
December 2006 in “Journal of Investigative Dermatology” Keratin patterns in hair follicles help understand hair growth and potential hair and nail disorders.
33 citations
,
August 2008 in “American Journal Of Pathology” This study found that K6a expression in mouse sebaceous gland ducts correlates with Hedgehog signaling, suggesting a role in duct fate.
2 citations
,
August 2012 in “Journal of the American Academy of Dermatology” This correspondence describes two patients with both epidermolysis bullosa simplex, Dowling-Meara type, and loose anagen hair syndrome, an association not previously reported in the literature.
31 citations
,
April 2004 in “Journal of Investigative Dermatology” This study found that a newly identified gene, mK17n, may explain the lack of nail issues in mK17 null mice by compensating for mK17's function in the nail bed.
49 citations
,
March 2004 in “Journal of Investigative Dermatology” This study found that the hHa7 gene in hair follicle trichocytes is the first identified to have its expression directly regulated by androgens, suggesting it as a marker for androgen action on hair follicles.
93 citations
,
July 2006 in “Journal of Investigative Dermatology” This study describes the expression patterns of type I inner root sheath keratin proteins K25–K28 in human hair follicles, highlighting their distinct distribution within different layers.
70 citations
,
February 2007 in “Journal of Investigative Dermatology” K39 and K40 are the last keratins expressed in hair development, completing the hair keratin catalog.
October 2025 in “International Journal of Molecular Sciences” This study identified changes in immune activation, ferroptosis, and structural genes in alopecia areata subtypes, suggesting molecular markers that might help understand disease variability and guide future treatments.
71 citations
,
June 2001 in “American Journal of Pathology” 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.
January 2021 in “Dermatology online journal” This case report describes a 2-year-old girl with loose anagen syndrome type B, confirmed by painless trichoscopic examination, with no signs in her identical twin sister.
18 citations
,
August 2012 in “Journal of The American Academy of Dermatology” This report describes a case where a sex reassignment patient on estrogen therapy experienced complete hair regrowth on a previously fully alopecic scalp.
47 citations
,
September 2015 in “Cell Cycle” This study found that hair follicle and interfollicular epidermis stem cells contribute differently to skin regeneration, with their persistence influenced by factors like spatial constraints and competition moderated by Notch suppression.
95 citations
,
January 2012 in “British Journal of Dermatology” This study found that androgens inhibit hair follicle stem cell differentiation by disrupting the Wnt signalling pathway in dermal papilla cells, but Wnt activation can restore differentiation.
47 citations
,
October 2016 in “Molecular and Cellular Endocrinology” This study found that DKK1 and WNT10b are paracrine factors that modulate hair follicle stem cell differentiation inhibition, contributing to androgenetic alopecia by affecting Wnt signaling in androgen-sensitive dermal papilla cells after dihydrotestosterone stimulation.
46 citations
,
December 2010 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that Acvr1b signaling is crucial for both hair follicle development and cycling in mice, with the genetic disruption leading to hair loss and a thickened epidermis.
6 citations
,
November 2020 in “Molecular and Cellular Endocrinology” This study found that androgens downregulate BMP2 in dermal papilla cells, inhibiting hair follicle stem cell differentiation, while BMP2 addition may restore hair lineage differentiation through the Wnt/β-catenin pathway.
3 citations
,
July 2011 in “Folia Histochemica et Cytobiologica” This study concluded that the inner root sheath inhibits the expression of certain differentiation markers in hair bulbs, with calcium-induced changes paralleling those seen in hair follicle mid-segments.
242 citations
,
February 2016 in “Science” This research found that Foxc1 transcription factor and COL17A1 are critical in regulating quiescence and hair thinning in hair follicle stem cells, with aging-related DNA damage leading to hair loss.