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Lgr6 Marks Stem Cells in the Hair Follicle that Generate all Cell Lineages of the Skin

ABSTRACT: Mammalian epidermis consists of three self-renewing compartments: the hair follicle, sebaceous gland and interfollicular epidermis. We generated knock-in alleles of murine Lgr6, a close relative to the Lgr5 stem cell gene. Lgr6 was expressed in the earliest embryonic hair placodes. In adult hair follicles, Lgr6+ cells resided in a previously uncharacterized region directly above the follicle bulge. They expressed none of the known bulge stem cell markers. Prenatal Lgr6+ cells established the hair follicle, sebaceous gland and interfollicular epidermis. Postnatally, Lgr6+ cells generated sebaceous gland and interfollicular epidermis, while contribution to hair lineages gradually diminished with age. Adult Lgr6+ cells executed long-term wound repair, including the formation of new hair follicles. We conclude that Lgr6 marks the most primitive epidermal stem cell.

ORGANISM(S): Mus musculus

PROVIDER: GSE20269 | GEO | 2010/03/26

SECONDARY ACCESSION(S): PRJNA124133

REPOSITORIES: GEO

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Lgr6 Marks Stem Cells in the Hair Follicle that Generate all Cell Lineages of the Skin

Project description:Mammalian epidermis consists of three self-renewing compartments: the hair follicle, sebaceous gland and interfollicular epidermis. We generated knock-in alleles of murine Lgr6, a close relative to the Lgr5 stem cell gene. Lgr6 was expressed in the earliest embryonic hair placodes. In adult hair follicles, Lgr6+ cells resided in a previously uncharacterized region directly above the follicle bulge. They expressed none of the known bulge stem cell markers. Prenatal Lgr6+ cells established the hair follicle, sebaceous gland and interfollicular epidermis. Postnatally, Lgr6+ cells generated sebaceous gland and interfollicular epidermis, while contribution to hair lineages gradually diminished with age. Adult Lgr6+ cells executed long-term wound repair, including the formation of new hair follicles. We conclude that Lgr6 marks the most primitive epidermal stem cell. For the Lgr5 and Lgr6 stem cell comparison RNA was isolated from sorted GFPhi cell fractions of dorsal skin from Lgr5-EGFP-ires-CreERT2 mice and Lgr6-EGFP-ires-CreERT2, respectively (3 mice per group per sort).

2010-03-25 | E-GEOD-20269 | biostudies-arrayexpress

Transcription profiling of Lgr6+ keratinocyte populations in the epidermis and hair follicle

Project description:RNA sequencing was performed on sorted populations of Lgr6-positive and Lgr6-negative keratinocytes from the interfollicular epidermis and the hair follicle/sebaceous gland, in order to determine the compartment-specific expression signatures of Lgr6+ progenitor cells.

2015-10-22 | E-MTAB-3533 | biostudies-arrayexpress

Mouse bulge (CD34+CD200+CD49+) versus secondary hair germ (CD34-CD200+CD49+) versus interfollicular epidermis (CD34-CD200-CD49+)

Project description:Mouse back skin was disassociated to single cells, sorted by cell surface markers and tested by microarrray To compare the gene expression of mouse bulge (CD34+CD200+CD49+) versus secondary hair germ (CD34-CD200+CD49+) versus interfollicular epidermis (CD34-CD200-CD49+) xx Bald scalp retains hair follicle stem cells but lacks CD200-rich and CD34-positive hair follicle progenitor cells Androgenetic alopecia (AGA) or common baldness results from a marked decrease in hair follicle size. This miniaturization may be related to loss of hair follicle stem or progenitor cells. To test this hypothesis, we analyzed bald and non-bald scalp from the same individuals for the presence of hair follicle stem and progenitor cells using flow cytometry to quantitate cells expressing CYTOKERATIN 15 (KRT15), CD200, CD34 and ALPHA-6-INTEGRIN (ITGA6). High levels of KRT15 expression correlated with stem cell properties of small cell size and quiescence. Cells with the highest level of KRT15 expression were maintained in bald scalp; however, distinct populations of CD200high ITGA6high cells and CD34-positive cells were markedly diminished. Consistent with a progenitor cell phenotype, the diminished populations localized closely to the stem-cell rich bulge area but were larger and more proliferative than the bulge stem cells. In functional assays, analogous CD200 high /Itga6 high cells from murine hair follicles were multipotent and generated new hair follicles in skin reconstitution assays. These findings suggest that a defect in stem cell activation plays a role in the pathogenesis of AGA. 4 independent biologic replicates (each pooled from 3 distinct mice) were sorted for Mouse bulge (CD34+CD200+CD49+) versus secondary hair germ (CD34-CD200+CD49+) versus interfollicular epidermis (CD34-CD200-CD49+)

2011-01-12 | E-GEOD-21568 | biostudies-arrayexpress

Epigenomic profiling of hair follicle stem cells identifies PRDM16 as a regulator of sebaceous gland homeostasis [ChIP-seq]

Project description:The epidermis consists of different compartments such as the hair follicle (HF), sebaceous gland (SG) and interfollicular epidermis (IFE), each containing distinct stem cell (SC) populations. However, with the exception of the SCs residing within the HF bulge, other epidermal SC populations remain poorly characterized at the molecular level. Here we used an epigenomic strategy that combines H3K27me3 ChIP-seq and RNA-seq profiling to identify major regulators of HFSC located outside the bulge. When applied to the bulk of HFSC isolated from mouse skin our approach identified both previously known and potentially novel non-bulge HFSC regulators. Among the latter, we found that PRDM16 was preferentially expressed within the Junctional Zone (JZ). To investigate PRDM16 function within the JZ SCs, we generated an epidermal-specific Prdm16 Knock-out mouse model (K14-Cre-Prdm16fl/fl). Notably, although these K14-Cre-Prdm16fl/fl mice did not show any major skin or hair abnormalities, the homeostasis of the SG was clearly compromised. Namely, PRDM16 deficient mice displayed enlarged SGs and excessive sebum production, thus resembling some of the features associated with certain human conditions (i.e. acne, sebaceous hyperplasia). Overall, our study provides a list of putative novel regulators of HFSC outside the bulge and identifies PRDM16 as a major regulator of SG homeostasis.

2021-03-26 | GSE169647 | GEO

Epigenomic profiling of hair follicle stem cells identifies PRDM16 as a regulator of sebaceous gland homeostasis [RNA-seq]

2021-03-26 | GSE169648 | GEO

Expression data of P4 stage hair follicle early bulge and non-bulge ORS cells

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

Gene expression signature of the three major epidermal differentiation compartments: interfollicular epidermis (IFE), hair follicle (HF) and sebaceous gland (SG).

Project description:There are multiple stem cells in adult mammalian epidermis, but the mechanisms controlling lineage specification are poorly understood. To identify gene expression signatures of the three major epidermal differentiation compartments we micro-dissected individual SG, IFE and HF from adult epidermis. The RNA was isolated from age and sex matched wild-type mice and performed transcriptome analysis with Affymetrix Exon microarrays We micro-dissected individual interfollicular epidermis (IFE), hair follicle (HF) and sebaceous gland (SG) from adult tail epidermis. The RNA was isolated from age and sex matched wild-type mice. Three biological replicates for each epidermal differentiation compartment were analyzed.

2017-05-16 | E-GEOD-62604 | biostudies-arrayexpress

Gene Expression data of P4 stage hair follicle ORS cells from DTG (K14-rtTA,TRE-miR-125b) and control littermates

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

Mouse bulge (CD34+CD200+CD49+) versus secondary hair germ (CD34-CD200+CD49+) versus interfollicular epidermis (CD34-CD200-CD49+)

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Transcription profiling of mouse epidermal cells sorted into three populations based on alpha 6 integrin, CD34 or Sca-1 surface marker expression

Project description:Epidermal keratinocytes were isolated from adult murine skin and FACS sorted into three populations based on their surface maker expression of alpha 6 integrin, CD34 and Sca-1. <br>- Alpha 6 positive cells constitute the entire population of basal or proliferative keratinocytes from the interfollicular epidermis and hair follicle. Both BIB and Bulge cells are contained within the total population of alpha 6 positive cells. <br>- BIB cells reside in the hair follicle in a region between the infundibulum and bulge and these cells are characterized by low alpha 6 integrin surface levels and are negative for CD34 and Sca-1 surface proteins. <br>- Bulge cells are derived from the bulge region of the hair follicle and are characterized by low + high alpha 6 integrin surface levels and are positive for CD34 but negative for Sca-1.

2009-11-16 | E-MEXP-928 | biostudies-arrayexpress

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