Tbx3-dependent amplifying stem cell progeny drives interfollicular epidermal expansion during pregnancy and regeneration

Ryo Ichijo, Hiroki Kobayashi, Saori Yoneda, Yui Iizuka, Hirokazu Kubo, Shigeru Matsumura, Satsuki Kitano, Hitoshi Miyachi, Tetsuya Honda and Fumiko Toyoshima ()
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Ryo Ichijo: Kyoto University
Hiroki Kobayashi: Kyoto University
Saori Yoneda: Kyoto University
Yui Iizuka: Kyoto University
Hirokazu Kubo: Kyoto University
Shigeru Matsumura: Kyoto University
Satsuki Kitano: Kyoto University
Hitoshi Miyachi: Kyoto University
Tetsuya Honda: Kyoto University Graduate School of Medicine
Fumiko Toyoshima: Kyoto University

Nature Communications, 2017, vol. 8, issue 1, 1-13

Abstract: Abstract The skin surface area varies flexibly in response to body shape changes. Skin homeostasis is maintained by stem cells residing in the basal layer of the interfollicular epidermis. However, how the interfollicular epidermal stem cells response to physiological body shape changes remains elusive. Here, we identify a highly proliferative interfollicular epidermal basal cell population in the rapidly expanding abdominal skin of pregnant mice. These cells express Tbx3 that is necessary for their propagation to drive skin expansion. The Tbx3+ basal cells are generated from Axin2+ interfollicular epidermal stem cells through planar-oriented asymmetric or symmetric cell divisions, and express transit-amplifying cell marker CD71. This biased division of Axin2+ interfollicular epidermal stem cells is induced by Sfrp1 and Igfbp2 proteins secreted from dermal cells. The Tbx3+ basal cells promote wound repair, which is enhanced by Sfrp1 and Igfbp2. This study elucidates the interfollicular epidermal stem cell/progeny organisation during pregnancy and suggests its application in regenerative medicine.

Date: 2017
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DOI: 10.1038/s41467-017-00433-7

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