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Transcriptome analysis in hair follicle stem cells after miR-205 induction in mouse

ABSTRACT: Through phenotypical study, we found that miR-205 can promote hair growth. The goals of this study is to identify direct targets of miR-205 in hair follicle stem cells and determine whether and how miR-205 promotes hair growth by activating hair follicle stem cell.

ORGANISM(S): Mus musculus

PROVIDER: GSE185116 | GEO | 2023/06/07

REPOSITORIES: GEO

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Expression data from miR-205 knockout in Hair Follicle Stem Cells (HFSCs) of mouse skin

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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.

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