Sox2-positive Dermal Papilla Cells Specify Hair Follicle Type in Mammalian Epidermis

Overview

Journal Development

Specialty Biology

Date 2009 Jul 17

PMID 19605494

Citations 183

Authors

Ryan R Driskell

Adam Giangreco

Kim B Jensen

Klaas W Mulder

Fiona M Watt

Affiliations

Soon will be listed here.

Abstract

The dermal papilla comprises the specialised mesenchymal cells at the base of the hair follicle. Communication between dermal papilla cells and the overlying epithelium is essential for differentiation of the hair follicle lineages. We report that Sox2 is expressed in all dermal papillae at E16.5, but from E18.5 onwards expression is confined to a subset of dermal papillae. In postnatal skin, Sox2 is only expressed in the dermal papillae of guard/awl/auchene follicles, whereas CD133 is expressed both in guard/awl/auchene and in zigzag dermal papillae. Using transgenic mice that express GFP under the control of the Sox2 promoter, we isolated Sox2(+) (GFP(+)) CD133(+) cells and compared them with Sox2(-) (GFP(-)) CD133(+) dermal papilla cells. In addition to the 'core' dermal papilla gene signature, each subpopulation expressed distinct sets of genes. GFP(+) CD133(+) cells had upregulated Wnt, FGF and BMP pathways and expressed neural crest markers. In GFP(-) CD133(+) cells, the hedgehog, IGF, Notch and integrin pathways were prominent. In skin reconstitution assays, hair follicles failed to form when dermis was depleted of both GFP(+) CD133(+) and GFP(-) CD133(+) cells. In the absence of GFP(+) CD133(+) cells, awl/auchene hairs failed to form and only zigzag hairs were found. We have thus demonstrated a previously unrecognised heterogeneity in dermal papilla cells and shown that Sox2-positive cells specify particular hair follicle types.

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