Expression data from mouse hair follicle stem cells at postnatal day 49 in K14-sPLA2-IIA and wild type mice
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE81012 | GEO | 2016/05/09
SECONDARY ACCESSION(S): PRJNA320279
REPOSITORIES: GEO
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2022-01-01 | GSE182283 | GEO
Project description:Secreted phospholipase A2-IIA (sPLA2-IIA) hydrolyzes phospholipids to liberate lysophospholipids and fatty acids. Given its poor activity toward eukaryotic cell membranes, its role in the generation of proinflammatory lipid mediators is unclear. Conversely, sPLA2-IIA efficiently hydrolyzes bacterial membranes. Here, we show that sPLA2-IIA impacts on the immune system by acting on the intestinal microbial flora. Using mice overexpressing transgene-driven human sPLA2-IIA, we found that the intestinal microbiota was critical for both induction of an immune phenotype and promotion of inflammatory arthritis. The expression of sPLA2-IIA led to alterations of the intestinal microbiota composition, but housing in a more stringent pathogen-free facility revealed that its expression could affect the immune system in the absence of changes to the composition of this flora. In contrast, untargeted lipidomic analysis focusing on bacteria-derived lipid mediators revealed that sPLA2-IIA could profoundly alter the fecal lipidome. The data suggest that a singular protein, sPLA2-IIA, produces systemic effects on the immune system through its activity on the microbiota and its lipidome.
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Project description:The homeostasis of both cornea and hair follicles depends on a constant supply of progeny cells produced by populations of keratin (K) 14-expressing stem cells localized in specific niches. To investigate the potential role of Co-factors of LIM domains (Clims) in such tissues, we generated transgenic mice expressing a dominant-negative Clim molecule (DN-Clim) under the control of the K14 promoter. As expected, the K14 promoter directed high level expression of the transgene to the basal cells of cornea and epidermis, as well as the outer root sheath of hair follicles. In corneal epithelium, the transgene expression causes decreased expression of adhesion molecule BP180 and defective hemidesmosomes, leading to detachment of corneal epithelium from the underlying stroma, which in turn causes blisters, wounds and an inflammatory response. After a period of epithelial thinning, the corneal epithelium undergoes differentiation to an epidermis-like structure. The K14-DN-Clim mice also develop progressive hair loss due to dysfunctional hair follicles that fail to generate hair shafts. The number of hair follicle stem cells is decreased by at least 50% in K14-DN-Clim mice, indicating that Clims are required for hair follicle stem cell maintenance. We hypothesize that Clim2 is an essential co-factor for the LIM homeodomain factor Lhx2, which was previously shown to play a role in hair follicle stem cell maintenance. Together, these data indicate that Clim proteins play important roles in the homeostasis of corneal epithelium and hair follicles. Keywords: Comparison of wild-type and transgenic skin tissue
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2011-01-04 | E-GEOD-26394 | 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
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2019-12-31 | GSE101892 | GEO
Project description:Cyclosporine A (CSA) leads to the precocious onset of hair follicle growth, which is driven by premature activation and proliferation of hair follicle stem cells. Here, we identify gene expression changes associated with CSA treatment in hair follicle stem cells prior to the onset of proliferation as a readout for the early events in stem cell actvation. Hair follicle bulge stem cells were FACS-isolated from mouse skin during the 2nd telogen. Two biological replicated were performed.
2013-09-27 | E-GEOD-51194 | biostudies-arrayexpress
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2007-12-12 | E-GEOD-2835 | biostudies-arrayexpress
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:Here we have developed a novel FACS strategy to prospectively isolate hair follicle dermal stem cells, dermal sheath and dermal papilla cells from adult skin initiating synchronous hair follicle regeneration and identified Hic1 as a marker of hfDSCs and Rspondins as stimulators of hfDSCs and epithelial cells, and subsequently hair follicle regeneration
2020-02-03 | GSE109256 | GEO