61 citations
,
August 1993 in “PubMed” This study found that solid basal cell epitheliomas and the outer root sheath of human hair follicles display nearly identical cytokeratin profiles, suggesting a potential origin connection.
35 citations
,
October 2013 in “Journal of Dermatological Science” This study observed that VEGF165 increases proliferation and migration but alters adhesion properties of cultured human hair follicle cells, indicating a potential role for VEGF/VEGFR-2 in hair follicle regulation beyond angiogenesis.
June 2022 in “Research Square (Research Square)” This study revealed that nestin-expressing progenitor cells capable of becoming ORS keratinocytes are present during both hair follicle development and in adult hair follicles.
May 2022 in “Research Square (Research Square)” This study found that nestin-expressing unipotent progenitor cells capable of differentiating into outer root sheath keratinocytes are present during hair follicle development and in adult hair follicles.
46 citations
,
July 2015 in “Wound repair and regeneration” This study found that keloid tissues exhibit epithelial-mesenchymal transition-related changes and alterations in gene expression, implicating these processes in the pathogenesis of keloids.
18 citations
,
March 2009 in “Experimental Dermatology” This study suggests that pilomatricoma can differentiate towards various hair follicle structures, including hair matrix, hair cortex, follicular infundibulum, outer root sheath, and hair bulge.
47 citations
,
April 2001 in “Journal of Dermatological Science” This study found that insulin-like growth factor-I and hepatocyte growth factor increased the chemotactic migration of human hair outer root sheath cells, suggesting these factors have both growth stimulatory and chemotactic effects.
107 citations
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May 1999 in “Archives of Dermatological Research” In this study, the immunohistochemical and lectin binding profiles of basal cell carcinoma closely resembled those of the outer root sheath of vellus hair follicles, suggesting a potential histochemical relationship.
59 citations
,
August 1981 in “PubMed” This study describes trichilemmal keratinization as a distinct process of hair follicle keratinization that occurs in specific areas of the outer root sheath, illustrated using electron microscopy on dog hair.
2 citations
,
January 1989 This study describes a new tissue culture method that successfully induces outer root sheath cells from hair follicles to differentiate into a multilayered epithelium with characteristics similar to normal interfollicular epidermis.
31 citations
,
December 1991 in “Annals of the New York Academy of Sciences” This study found that distinct keratin profiles enabled the evaluation of epithelial differentiation in human hair follicles, with mesenchymal cells playing a critical role in epidermoid differentiation of follicular cells.
12 citations
,
July 2019 in “Veterinary Dermatology” The study suggests that nestin-expressing progenitor cells can differentiate into outer root sheath keratinocytes in hair follicles, indicating distinct progenitors for different hair follicle and epidermal components.
This study found that testosterone and dihydrotestosterone significantly decreased the proliferation of papilla cells compared to dermal fibroblasts and outer root sheath keratinocytes in cultured hair follicle cells.
14 citations
,
April 1995 in “Transplantation” This study suggests that human outer root sheath cells are suitable for skin replacement, as they can form a stratified epithelium similar to normal epidermis in organotypic cultures.
March 2024 in “Tissue and cell/Tissue & cell” This study found that in human hair bulbs, telomerase is present mainly in the nuclei of cells undergoing proliferation, particularly in the matrix epithelium during the anagen phase, and sparsely in the outer root sheath during late catagen and telogen phases.
43 citations
,
February 2008 in “Journal of cutaneous pathology” This study revealed that during fetal development, MITF and Mart-1 expressing melanocytes progress from the dermis to the epidermis and hair follicles, with MITF possibly marking follicular stem cells.
33 citations
,
March 2015 in “Experimental Dermatology” In this study, LHX2 and SOX9 were found to mark distinct epithelial progenitor cell populations within human hair follicles, suggesting roles in maintaining the hair follicle epithelium.
1 citations
,
January 2012 in “International journal of trichology” This study found that keratinocytes derived from the germinative epithelium of ovine hair follicles have extensive in vitro growth potential, challenging the idea that these cells are solely transit-amplifying.
173 citations
,
July 1995 in “Biochemical and biophysical research communications” This study suggests that IGF-I may mediate androgen-induced hair growth in outer root sheath cells cocultured with beard dermal papilla cells.
18 citations
,
January 2019 in “Experimental Dermatology” This study suggests that damaged anagen hair follicles have the capability to repair themselves and resume growth by mobilizing extra-bulge epithelial cells, particularly after injuries like chemotherapy and radiotherapy.
248 citations
,
April 1988 in “Differentiation” In this study, researchers observed that trichocytic and epithelial cytokeratins have distinct expression patterns within various human and bovine hair follicle cells, contributing to understanding hair follicle development and growth.
71 citations
,
October 2008 in “The journal of investigative dermatology/Journal of investigative dermatology” This study presents a novel in vitro assay using human folliculoid microspheres to research hair growth, which may facilitate preclinical testing of hair growth-modulatory agents.
63 citations
,
July 2006 in “British Journal of Dermatology” This study found that keratin K17 is induced in the suprabasal layer of psoriatic scalp epidermis during epidermal hyperproliferation, suggesting it is not specific to hair follicles.
59 citations
,
October 2017 in “Proceedings of the National Academy of Sciences” This study found that the zinc transporter ZIP10 is crucial for epidermal development, as it influences the activity of p63, promoting epidermal morphogenesis.
29 citations
,
February 2001 in “Proceedings of the National Academy of Sciences” This study found that the HS III element in the K14 gene's regulatory sequence promotes gene expression in inner root sheath keratinocytes, highlighting cooperative interactions in keratinocyte-specific gene regulation.
18 citations
,
January 2019 in “European journal of histochemistry” This study found that in bovine skin, leptin and its receptor are expressed in the epidermis and hair follicles, suggesting a role in epidermis growth and hair follicle cycling through paracrine and autocrine mechanisms.
49 citations
,
July 2006 in “British Journal of Dermatology” This study observed that calcifying epithelioma of Malherbe is composed of tumor cells that differentiate into both hair cortex and outer root sheath, supporting its hair follicle origin.
198 citations
,
March 1999 in “Journal of Investigative Dermatology” This study found that keratin 15 expression is downregulated in hyperproliferative conditions like psoriasis and hypertrophic scars, suggesting it is not compatible with keratinocyte activation.
48 citations
,
April 1995 in “PubMed” This study found that dermal papilla cells from beard and axillary hair follicles can produce androgen-dependent factors that stimulate proliferation in adjacent follicular epithelial cells under testosterone influence.
13 citations
,
January 2002 in “Biochemical and biophysical research communications” This study observed that interferon β secreted by dermal papilla cells may negatively regulate the growth of outer root sheath cells in hair follicles.