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Merkel cells bear the touch of epidermis

Merkel cells (red) fail to differentiate from epidermal stem cells in mouse skin lacking Atoh1 (right).

Van Keymeulen et al. resolve a 130-year-old mystery over the developmental origin of specialized skin cells involved in touch sensation.

First described in 1875, Merkel cells are neuroendocrine cells that reside in the vertebrate epidermis, passing mechanical stimuli on to sensory neurons. In mice, they are mainly found in the paws and around the whiskers but, because they express proteins characteristic of both epithelial and neuronal cells, scientists have long debated whether Merkel cells develop from the epidermis or neural crest.

Van Keymeulen et al. traced the lineage of Merkel cells by fluorescently labeling cells derived from either epidermal or neural crest progenitors. This revealed that Merkel cells originally emerge from the embryonic epidermis. In addition, epidermal stem cells in adult mouse skin replenish the Merkel cell population as they slowly die off over time. The researchers also found that a transcription factor called Atoh1 is required for epidermal progenitors to differentiate into Merkel cells—mice lacking Atoh1 in their skin failed to develop any of the mechanotransducing cells.

Atoh1 acts as a tumor suppressor to prevent an aggressive skin cancer called Merkel cell carcinoma, says senior author Cédric Blanpain. His team now wants to investigate the precise function of the transcription factor in Merkel cell differentiation, as well as the signaling pathways that regulate the process.

References

Van Keymeulen, A., et al. 2009. J. Cell Biol. doi:10.1083/jcb.200907080.[Abstract/Free Full Text]

bshort{at}rockefeller.edu

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This Article Full Text (PDF, 487K) PPT slides of all figures Alert me when this article is cited Services Email this article Similar articles in this journal Alert me to new content in the JCB Download to citation manager Citing Articles Citing Articles via CrossRef Google Scholar Articles by Short, B. PubMed Articles by Short, B. Social Bookmarking                            What's this?