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First published online 3 September 2003
doi: 10.1242/dev.00703
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RESEARCH ARTICLE: DEVELOPMENT AND DISEASE |
1 Keratinocyte Laboratory, Cancer Research UK London Research Institute, 44
Lincoln's Inn Fields, London WC2A 3PX, UK
2 Department of Human Genetics, The Bartholin Building, University of Aarhus,
DK-8000 Aarhus C, Denmark
3 The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609-1500, USA
* Author for correspondence (e-mail: fiona.watt{at}cancer.org.uk)
Accepted 2 July 2003
Mammalian epidermis is maintained by stem cells that have the ability to
self-renew and generate daughter cells that differentiate along the lineages
of the hair follicles, interfollicular epidermis and sebaceous gland. As stem
cells divide infrequently in adult mouse epidermis, they can be visualised as
DNA label-retaining cells (LRC). With whole-mount labelling, we can examine
large areas of interfollicular epidermis and many hair follicles
simultaneously, enabling us to evaluate stem cell markers and examine the
effects of different stimuli on the LRC population. LRC are not confined to
the hair follicle, but also lie in sebaceous glands and interfollicular
epidermis. LRC reside throughout the permanent region of the hair follicle,
where they express keratin 15 and lie in a region of high
6ß4
integrin expression. LRC are not significantly depleted by successive hair
growth cycles. They can, nevertheless, be stimulated to divide by treatment
with phorbol ester, resulting in near complete loss of LRC within 12 days.
Activation of Myc stimulates epidermal proliferation without depleting LRC and
induces differentiation of sebocytes within the interfollicular epidermis.
Expression of N-terminally truncated Lef1 to block ß-catenin signalling
induces transdifferentiation of hair follicles into interfollicular epidermis
and sebocytes and causes loss of LRC primarily through proliferation. We
conclude that LRC are more sensitive to some proliferative stimuli than others
and that changes in lineage can occur with or without recruitment of LRC into
cycle.
Key words: Myc, Lef1, Hair follicle, Hair cycle, Stem cells, Epidermis, Sebocytes, Differentiation, Label-retaining cells, ß-catenin
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