Expression data from the dermis of human established scars before and after hair follicle transplantation
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE145470 | GEO | 2022/12/31
REPOSITORIES: GEO
Similar Datasets
Project description:It is well accepted that elevated mechanical tension of the skin surrounding a healing wound stimulates a fibrotic cascade of events and contributes to an increased size of scars. A laxity paradox in the field of hair transplantation describes a phenomenon opposing this view. During Strip Follicular Unit Transplantation (Strip FUT), surgeons remove a strip of scalp skin (approximately 5 cm x 10 cm, depending on the number of hair follicles required) from the occipital scalp, which is then used to harvest hair follicles that will be transplanted into the balding frontal scalp. Most patients with normal scalp skin laxity heal with narrow normotrophic scars, while a small number of patients (14%) with very loose scalp skin, and so low residual skin tension, heal with post operating scar widening (4 - 12 mm). These scars, referred to as stretched scars in the hair transplantation field, often require revision surgery or secondary hair grafting into the scar. We hypothesise that stretched scars present a unique transcriptional signature different from other types of scars. To determine the gene expression profile of stretched scars, we used Affymetrix microarrays to perform profiling of fibrotic dermis and the surrounding patient-matched healthy dermis.
2022-12-31 | GSE162904 | GEO
Project description:Wound Induced Hair Follicle neogenesis (WIHN) is a hair neogenesis phenomenon which occurred in the center of scar. Neonatal hair follicle are separated from the preexisting follicles by a hairless circular. We analysed the differentially expressed proteins between inner and outer area of scar at post-wound day 15 by iTRAQ technology.
2021-09-08 | PXD012868 | Pride
Project description:Global expression analysis of neural crest-like skin-derived precursors (SKPs) and Sox2-positive follicle dermal cells that SKPs originate from. In spite of the remarkable regenerative capacity of mammalian skin, an adult dermal stem cell has not yet been identified. Here, we provide evidence that SKPs, multipotent neural crest-like skin-derived precursors, represent an adult dermal stem cell. When transplanted into adult skin, SKPs can reconstitute the adult dermis, contribute to dermal wound-healing, home to a hair follicle niche, and instruct epidermal cells to make hair follicles. Hair follicle-derived SKPs self-renew, maintain their multipotency, and serially reconstitute hair follicles. The endogenous origin of SKPs are Sox2-positive follicle dermal cells that share a similar global gene expression profile with SKPs. These endogenous cells home back to their follicle niche, induce hair follicle morphogenesis, and differentiate into neural and dermal progeny. Hair follicle-associated dermal cells will move out of their niche to contribute to dermal maintenance and wound-healing. These studies therefore identify a dermal stem cell, and provide a biological rationale for the presence of a multipotent precursor within adult dermis, findings with important therapeutic implications.
2009-10-23 | GSE18690 | GEO
Project description:Increasing evidence suggests that microRNAs may play important roles in regulating self-renewal and differentiation in mammalian stem cells (SCs). Here, we explore this issue in skin. We first characterize microRNA expression profiles of skin SCs versus their committed proliferative progenies and identify a microRNA subset associating with “stemness”. Of these, miR-125b is dramatically downregulated in early SC-progeny. We engineer an inducible mice system and show that when miR-125b is sustained in SC-progenies, tissue balance is reversibly skewed towards stemness at the expense of epidermal, oil-gland and HF differentiation. Using gain-and-loss of function in vitro, we further implicate miR-125b as a repressor of SC differentiation. In vivo, transcripts repressed upon miR-125b induction are enriched >700% for predicted miR-125b targets normally downregulated upon SC-lineage commitment. We verify some of these miR-125b targets, and show that Blimp1 and VDR in particular can account for many tissue imbalances we see when miR-125b is deregulated. We used microarrays to compare the global gene expression profile of P4 stage hair follicle ORS cells from DTG (K14-rtTA,TRE-miR-125b) and control littermates. Hair follicle cells were isolated from P4 Backskin of K14-RFP/Sox9-EGFP double transgenic mice as following: interfollicular epidermis sheet was pealed from hair follicle & dermis after dispase treatment. The hair follicle & dermis were first digested by collagenase (Sigma). Intact hair follicles were separated from dermal cells by low speed spinning (20g). The hair follicles were then digested by Trypsin and filtered by 40 µm cell strainers. The isolated hair follicle cells were FACS sorted. Dead cells and large differentiated cells were excluded based on DAPI and side scattering. Early bulge cells were gated as GFPHi,RFPHi. Non-bulge ORS cells were gated as GFP-, RFPHi.
2011-01-04 | E-GEOD-26394 | biostudies-arrayexpress
Project description:Hair follicle formation depends on reciprocal epidermal-dermal interactions and occurs during skin development, but not in adult life. This suggests that the properties of dermal fibroblasts change during postnatal development. To examine this, we used a PdgfraEGFP mouse line to isolate GFP-positive fibroblasts from neonatal skin, adult telogen and anagen skin and adult skin in which ectopic hair follicles had been induced (EF skin) by transgenic epidermal activation of beta-catenin. We also isolated epidermal cells from each mouse. The gene expression profile of EF epidermis was most similar to that of anagen epidermis, consistent with activation of beta-catenin signalling. In contrast, adult dermis with ectopic hair follicles more closely resembled neonatal dermis than adult telogen or anagen dermis. In particular, genes associated with mitosis were upregulated and extracellular matrix-associated genes were downregulated in neonatal and EF fibroblasts. We confirmed that sustained epidermal beta-catenin activation stimulated fibroblasts to proliferate to reach the high cell density of neonatal skin. In addition, the extracellular matrix was comprehensively remodelled, with mature collagen being replaced by collagen subtypes normally present only in developing skin. The changes in proliferation and extracellular matrix composition originated from a specific subpopulation of fibroblasts located beneath the sebaceous gland. Our results show that adult dermis is an unexpectedly plastic tissue that can be reprogrammed to acquire the molecular, cellular and structural characteristics of neonatal dermis in response to cues from the overlying epidermis. We have isolated the following populations of cells from mouse back skin by flow cytometry: 1A) GFP+ WT neonatal dermal fibroblasts, 1B) ItgA6+ WT neonatal epidermal keratinocytes, 2A) GFP+ WT telogen dermal fibroblasts, 2B) ItgA6+ WT telogen epidermal keratinocytes, 3A) GFP+ D2 transient activation (anagen) dermal fibroblasts, 3B) ItgA6+ D2 transient activation (anagen) epidermal keratinocytes, 4A) GFP+ D2 sustained activation (ectopic follicles) dermal fibroblasts, 4B) ItgA6+ D2 sustained activation (ectopic follicles) epidermal keratinocytes
2011-10-12 | E-GEOD-32966 | biostudies-arrayexpress
Project description:Hair follicles undergo recurrent cycling of controlled growth (anagen), regression (catagen), and relative quiescence (telogen) with a defined periodicity. Taking a genomics approach to study gene expression during synchronized mouse hair follicle cycling, we discovered that, in addition to circadian fluctuation, CLOCK-regulated genes are also modulated in phase with the hair growth cycle. During telogen and early anagen, circadian clock genes are prominently expressed in the secondary hair germ, which contains precursor cells for the growing follicle. Analysis of Clock and Bmal1 mutant mice reveals a delay in anagen progression, and the secondary hair germ cells show decreased levels of phosphorylated Rb and lack mitotic cells, suggesting that circadian clock genes regulate anagen progression via their effect on the cell cycle. Consistent with a block at the G1 phase of the cell cycle, we show a significant upregulation of p21 in Bmal1 mutant skin. While circadian clock mechanisms have been implicated in a variety of diurnal biological processes, our findings indicate that circadian clock genes may be utilized to modulate the progression of non-diurnal cyclic processes. To investigate the molecular control of hair follicle cycling, we profiled mRNA expression in mouse dorsal skin at multiple representative time points in the synchronized second postnatal hair growth cycle and in a depilation-induced hair growth cycle. For profiling of second synchronized and depilation-induced hair growth cycle, the same upper-mid region of dorsal skin was excised from C57BL/6 mice at representative postnatal days (P). The time points for second hair growth cycle are classified into different phases of the hair growth cycle based on established morphological guidelines as follow: early anagen (P23, P25), mid anagen (P27), late anagen (P29, P34), early catagen (P37, P39), mid catagen (P41), and telogen (P44). Depilation-induced hair growth cycle by applying wax/rosin mixture on the dorsal skin of seven-week old mice (all follicles in telogen) was performed on mice. The corresponding phases of the hair growth cycle at number of days following depilation (D) is as follow: early anagen (D3), mid anagen (D5), late anagen (D8, D12), and early catagen (D17). For each time point, multiple biological replicates were profiled, with each mouse dorsal skin separately hybridized to an Affymetrix array.
2009-07-17 | E-GEOD-11186 | biostudies-arrayexpress
Project description:This a model from the article:
The follicular automaton model: effect of stochasticity and of synchronization
of hair cycles.
Halloy J, Bernard BA, Loussouarn G, Goldbeter A. J Theor Biol
2002 Feb 7;214(3):469-79 11846603
,
Abstract:
Human scalp hair consists of a set of about 10(5)follicles which progress
independently through developmental cycles. Each hair follicle successively goes
through the anagen (A), catagen (C), telogen (T) and latency (L) phases that
correspond, respectively, to growth, arrest and hair shedding before a new
anagen phase is initiated. Long-term experimental observations in a group of ten
male, alopecic and non-alopecic volunteers allowed determination of the
characteristics of hair follicle cycles. On the basis of these observations, we
previously proposed a follicular automaton model to simulate the dynamics of
human hair cycles and the development of different patterns of alopecia [Halloy
et al. (2000) Proc. Natl Acad. Sci. U.S.A.97, 8328-8333]. The automaton model is
defined by a set of rules that govern the stochastic transitions of each
follicle between the successive states A, T, L and the subsequent return to A.
These transitions occur independently for each follicle, after time intervals
given stochastically by a distribution characterized by a mean and a standard
deviation. The follicular automaton model was shown to account both for the
dynamical transitions observed in a single follicle, and for the behaviour of an
ensemble of independently cycling follicles. Here, we extend these results and
investigate additional properties of the model. We present a deterministic
version of the follicular automaton. We show that numerical simulations of the
stochastic version of the automaton yield steady-state level of follicles in the
different phases which approach the levels predicted by the deterministic
equations as the number of follicles progressively increases. Only the
stochastic version can successfully reproduce the fluctuations of the fractions
of follicles in each of the three phases, observed in small follicle
populations. When the standard deviation is reduced or when the follicles become
otherwise synchronized, e.g. by a periodic external signal inducing the
transition of anagen follicles into telogen phase, large-amplitude oscillations
occur in the fractions of follicles in the three phases. These oscillations are
not observed in humans but are reminiscent of the phenomenon of moulting
observed in a number of mammalian species. Copyright 2002 Elsevier Science Ltd.
This model was taken from the CellML repository
and automatically converted to SBML.
The original model was:
Halloy J, Bernard BA, Loussouarn G, Goldbeter A. (2002) - version=1.0
The original CellML model was created by:
Catherine Lloyd
c.lloyd@auckland.ac.nz
The University of Auckland
This model originates from BioModels Database: A Database of Annotated Published Models (http://www.ebi.ac.uk/biomodels/). It is copyright (c) 2005-2011 The BioModels.net Team.
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To cite BioModels Database, please use: Li C, Donizelli M, Rodriguez N, Dharuri H, Endler L, Chelliah V, Li L, He E, Henry A, Stefan MI, Snoep JL, Hucka M, Le Novère N, Laibe C (2010) BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. BMC Syst Biol., 4:92.
2005-01-01 | MODEL1006230014 | BioModels
Project description:Scarring alopecia consists of a collection of disorders characterized by destruction of hair follicles, replacement with fibrous scar tissue, and irreversible hair loss. Alopecia affects men and women worldwide and can be a significant source of psychological stress and depression for affected individuals. The purpose of this study was to explore metabolic profiles in scalp tissue samples from normal control subjects (n=6) and in matched samples obtained from affected (n=12) and unaffected (n=12) areas of the scalp in patients with lymphocytic Frontal Fibrosing Alopecia (FFA). Frontal fibrosing alopecia results from destruction of hair follicles by an inflammatory lymphocytic infiltrate that is localized around the upper portion of the hair follicle.
2014-07-24 | ST000093 | MetabolomicsWorkbench
Project description:Increasing evidence suggests that microRNAs may play important roles in regulating self-renewal and differentiation in mammalian stem cells (SCs). Here, we explore this issue in skin. We first characterize microRNA expression profiles of skin SCs versus their committed proliferative progenies and identify a microRNA subset associating with “stemness”. Of these, miR-125b is dramatically downregulated in early SC-progeny. We engineer an inducible mice system and show that when miR-125b is sustained in SC-progenies, tissue balance is reversibly skewed towards stemness at the expense of epidermal, oil-gland and HF differentiation. Using gain-and-loss of function in vitro, we further implicate miR-125b as a repressor of SC differentiation. In vivo, transcripts repressed upon miR-125b induction are enriched >700% for predicted miR-125b targets normally downregulated upon SC-lineage commitment. We verify some of these miR-125b targets, and show that Blimp1 and VDR in particular can account for many tissue imbalances we see when miR-125b is deregulated. We used microarrays to compare the global gene expression profile of early bulge stem cells and non bulge ORS cells. Hair follicle cells were isolated from P4 Backskin of K14-RFP/Sox9-EGFP double transgenic mice as following: interfollicular epidermis sheet was pealed from hair follicle & dermis after dispase treatment. The hair follicle & dermis were first digested by collagenase (Sigma). Intact hair follicles were separated from dermal cells by low speed spinning (20g). The hair follicles were then digested by Trypsin and filtered by 40 µm cell strainers. The isolated hair follicle cells were FACS sorted. Dead cells and large differentiated cells were excluded based on DAPI and side scattering. Early bulge cells were gated as GFPHi,RFPHi. Non-bulge ORS cells were gated as GFP-, RFPHi.
2011-01-04 | E-GEOD-26393 | biostudies-arrayexpress
Project description:Increasing evidence suggests that microRNAs may play important roles in regulating self-renewal and differentiation in mammalian stem cells (SCs). Here, we explore this issue in skin. We first characterize microRNA expression profiles of skin SCs versus their committed proliferative progenies and identify a microRNA subset associating with “stemness”. Of these, miR-125b is dramatically downregulated in early SC-progeny. We engineer an inducible mice system and show that when miR-125b is sustained in SC-progenies, tissue balance is reversibly skewed towards stemness at the expense of epidermal, oil-gland and HF differentiation. Using gain-and-loss of function in vitro, we further implicate miR-125b as a repressor of SC differentiation. In vivo, transcripts repressed upon miR-125b induction are enriched >700% for predicted miR-125b targets normally downregulated upon SC-lineage commitment. We verify some of these miR-125b targets, and show that Blimp1 and VDR in particular can account for many tissue imbalances we see when miR-125b is deregulated. We used microarrays to compare the global miRNA expression profile of P4 stage hair follicle ORS cells from DTG (K14-rtTA,TRE-miR-125b) and control littermates. Hair follicle cells were isolated from P4 Backskin (Dox since P3 for 24hrs) of DTG (K14-rtTA/TRE-miR-125b/K14-H2BGFP), TRE (TRE-miR-125b/K14-H2BGFP), KrtA (K14-rtTA/K14-H2BGFP) as following: interfollicular epidermis sheet was pealed from hair follicle & dermis after dispase treatment.The hair follicle & dermis were first digested by collagenase (Sigma). Intact hair follicles were separated from dermal cells by low speed spinning (20g). The hair follicles were then digested by Trypsin and filtered by 40 µm cell strainers. The isolated hair follicle cells were FACS sorted. During FACS, cells were first gated against CD34 (endothelial cells), CD45 (immune cells), CD114 (melanocytes) and DAPI (dead cells). ORS cells were sorted from the remaining cells as α6HiGFPHi.
2011-01-04 | E-GEOD-26395 | biostudies-arrayexpress