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Array analysis of wound induced hair neogenesis (late stage)

ABSTRACT: Mice were wounded and measured for regeneration starting 4 days after wound closure with simultaneous measurement of hair follicle neogenesis and biopsing. At each time point, RNA was collected from one mouse with high number of regenerated follicles and one without regenerated follicles.

ORGANISM(S): Mus musculus

PROVIDER: GSE50419 | GEO | 2015/08/05

SECONDARY ACCESSION(S): PRJNA217453

REPOSITORIES: GEO

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Array analysis of wound induced hair neogenesis (late stage)

Project description:Mice were wounded and measured for regeneration starting 4 days after wound closure with simultaneous measurement of hair follicle neogenesis and biopsing. At each time point, RNA was collected from one mouse with high number of regenerated follicles and one without regenerated follicles. Whole skin biopsies of wound scars were submitted for Affymetrix Exon arrays. 3 replicates of mice with high number of regenerated follicles, 3 replicates of mice with no regenerated follicles; each pair taken at a different date after wound closure.

2015-08-05 | E-GEOD-50419 | biostudies-arrayexpress

Array analysis of wound induced hair neogenesis (early stage)

2015-08-05 | GSE50418 | GEO

Array analysis of wound induced hair neogenesis (early stage)

Project description:Mice were wounded and skin samples of the scar collected on the day of wound closure. We compared Mixed mice (B6/FVB/SJL), a strain of high regeneration, versus C57bl mice, a strain of low regeneration. Whole skin biopsies of wound scars were submitted for Affymetrix Exon arrays. 4 mice each of 2 distinct strains of differing regeneration levels were collected.

2015-08-05 | E-GEOD-50418 | biostudies-arrayexpress

Array analysis of wound induced hair neogenesis

Project description:Array analysis of wound induced hair neogenesis

| PRJNA217451 | ENA

Array analysis of wound induced hair neogenesis

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2015-08-05 | E-GEOD-50420 | biostudies-arrayexpress

Msx2 Supports Epidermal Competency during Wound-Induced Hair Follicle Neogenesis.

Project description:Cutaneous wounds in adult mammals typically heal by scarring. However, large full-thickness wounds undergo wound-induced hair follicle neogenesis (WIHN), a form of regeneration. Here, we show that WIHN requires transient expression of epidermal Msx2 in two phases: the wound margin early and the wound center late. Msx2 expression is present in the migrating epithelium during early wound healing and then presents in the epithelium and mesenchyme later in the wound center. WIHN is abrogated in germline and epithelial-specific Msx2 mutant mice. Unlike the full-length Msx2 promoter, a minimal Msx2 promoter fails activation in the wound center, suggesting complex regulation of Msx2 expression. The Msx2 promoter binding sites include Tcf/Lef, Jun/Creb, Pax3, and three SMAD sites. However, basal epithelial-induced BMP suppression by noggin overexpression did not affect WIHN. We propose that Msx2 signaling is required for the epidermis to acquire spatiotemporal competence during WIHN. Topologically, hair regeneration dominates in the wound center, coinciding with late Msx2 expression. Together, these results suggest that intrinsic Msx2 expression supports epithelial competency during hair follicle neogenesis. This work provides insight into endogenous mechanisms modulating competency of adult epidermal progenitors for mammalian ectodermal appendage neogenesis, and offers the target Msx2 for future regeneration-promoting therapies.

| S-EPMC6109435 | biostudies-literature

Array analysis of wound induced hair neogenesis

Project description:This SuperSeries is composed of the SubSeries listed below.

2015-08-05 | GSE50420 | GEO

IL-36α Promoted Wound Induced Hair Follicle Neogenesis via Hair Follicle Stem/Progenitor Cell Proliferation.

Project description:BackgroundWound-induced hair follicle neogenesis (WIHN) is a phenomenon of hair neogenesis that occurs at the center of a scar when the wound area is sufficiently large. Neogenic hair follicles are separated from the pre-existing follicles at the wound edge by a hairless circular region. This WIHN study provides a unique model for developing treatments for hair loss and deciphering the mechanisms underlying organogenesis in adult mammals.MethodsThe skin of a mouse was wounded by excising a 1.5 × 1.5 cm2 square of full-thickness dorsal skin. iTRAQ technology was used to screen proteins differentially expressed between the inner and outer scar areas in a mouse model of WIHN, on post-wounding day 15, to identify the regulators of WIHN. Owing to the overexpression of interleukin-36α (IL-36α) in the de novo hair follicle growth area, the regulating effect of IL-36α overexpression in WIHN was investigated. Hair follicle stem/progenitor cells were counted by flow cytometry while the expression of hair follicle stem/progenitor cell markers (Lgr5, Lgr6, Lrig1, K15, and CD34) and that of Wnt/β-catenin and IL-6/STAT3 pathway intermediaries was detected by qPCR and western blotting.ResultsWe found that wounding induced IL-36α expression. Incorporation of recombinant murine IL-36α (mrIL-36α) into murine skin wounds resulted in a greater number of regenerated hair follicles (p < 0.005) and a faster healing rate. The expression of hair follicle stem/progenitor cell markers was upregulated in the mrIL-36α-injected site (p < 0.05). Additionally, mrIL-36α upregulated the IL-6/STAT3 pathway intermediaries.ConclusionIL-36α is upregulated in de novo hair follicle growth areas and can promote wound epithelialization and WIHN.

| S-EPMC7493638 | biostudies-literature

Prostaglandin D2 inhibits wound-induced hair follicle neogenesis through the receptor, Gpr44.

Project description:Prostaglandins (PGs) are key inflammatory mediators involved in wound healing and regulating hair growth; however, their role in skin regeneration after injury is unknown. Using wound-induced hair follicle neogenesis (WIHN) as a marker of skin regeneration, we hypothesized that PGD2 decreases follicle neogenesis. PGE2 and PGD2 were elevated early and late, respectively, during wound healing. The levels of WIHN, lipocalin-type prostaglandin D2 synthase (Ptgds), and its product PGD2 each varied significantly among background strains of mice after wounding, and all correlated such that the highest Ptgds and PGD2 levels were associated with the lowest amount of regeneration. In addition, an alternatively spliced transcript variant of Ptgds missing exon 3 correlated with high regeneration in mice. Exogenous application of PGD2 decreased WIHN in wild-type mice, and PGD2 receptor Gpr44-null mice showed increased WIHN compared with strain-matched control mice. Furthermore, Gpr44-null mice were resistant to PGD2-induced inhibition of follicle neogenesis. In all, these findings demonstrate that PGD2 inhibits hair follicle regeneration through the Gpr44 receptor and imply that inhibition of PGD2 production or Gpr44 signaling will promote skin regeneration.

| S-EPMC3593761 | biostudies-literature

Wound Induced Hair Neogenesis - A Novel Paradigm for Studying Regeneration and Aging.

Project description:Hair follicles are the signature dermal appendage of mammals. They can be thought of as mini-organs with defined polarity, distinct constituent cell types, dedicated neurovascular supply, and specific stem cell compartments. Strikingly, some mammals show a capacity for adult hair follicle regeneration in a phenomenon known as wound-induced hair neogenesis (WIHN). In WIHN functional hair follicles reemerge during healing of large cutaneous wounds, and they can be counted to provide an index of regeneration. While age-related decline in hair follicle number and cycling are widely appreciated in normal physiology, it is less clear whether hair follicle regeneration also diminishes with age. WIHN provides an extraordinary quantitative system to address questions of mammalian regeneration and aging. Here we review cellular and molecular underpinnings of WIHN, explore known age-related changes to these elements, and present unanswered questions for future exploration.

| S-EPMC7593594 | biostudies-literature

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