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Multiple classes of stem cells in cutaneous epithelium: a lineage analysis of adult mouse skin
Author(s) -
Ghazizadeh Soosan,
Taichman Lorne B.
Publication year - 2001
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/20.6.1215
Subject(s) - biology , hair follicle , epidermis (zoology) , stem cell , epithelium , population , microbiology and biotechnology , pathology , anatomy , genetics , medicine , demography , sociology
Continuous renewal of the epidermis and its appendages throughout life depends on the proliferation of a distinct population of cells called stem cells. We have used in situ retrovirus‐mediated gene transfer to genetically mark cutaneous epithelial stem cells of adolescent mice, and have followed the fate of the marked progeny after at least 37 epidermal turnovers and five cycles of depilation‐induced hair growth. Histological examination of serial sections of labeled pilosebaceous units demonstrated a complex cell lineage. In most instances, labeled cells were confined to one or more follicular compartments or solely to sebaceous glands. Labeled keratinocytes in interfollicular epidermis were confined to distinct columnar units representing epidermal proliferative units. The contribution of hair follicles to the epidermis was limited to a small rim of epidermis at the margin of the follicle, indicating that long term maintenance of interfollicular epidermis was independent of follicle‐derived cells. Our results indicate the presence of multiple stem cells in cutaneous epithelium, some with restricted lineages in the absence of major injury.