Roles of MED1 in quiescence of hair follicle stem cells and maintenance of normal hair cycling

Takeshi Nakajima*, Shigeki Inui, Tomohiro Fushimi, Fumihito Noguchi, Yutaka Kitagawa, Janardan K. Reddy, Satoshi Itami

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


MED1 (mediator complex subunit 1) is expressed by human epidermal keratinocytes and functions as a coactivator of several transcription factors. To elucidate the role of MED1 in keratinocytes, we established keratinocyte-specific Med1-null (Med1epi-/-) mice using the K5Cre/LoxP system. Development of the epidermis and appendages of Med1 epi-/- mice were macroscopically and microscopically normal until the second catagen of the hair cycle. However, the hair cycle of Med1 epi-/- mice was spontaneously repeated after the second telogen, which does not occur in wild-type (WT) mice. Hair follicles of Med1 epi-/- mice could not enter anagen after 6 months of age, resulting in sparse pelage hair in older Med1epi-/- mice. Interfollicular epidermis (IFE) of Med1epi-/- mice was acanthotic and more proliferative than that of WT mice, whereas these findings were less evident in older Med1epi-/- mice. Flow cytometric analysis revealed that the numbers of hair follicle bulge stem cells were reduced in Med1epi-/- mice from a few months after birth. These results suggest that MED1 has roles in maintaining quiescence of keratinocytes and preventing depletion of the follicular stem cells.

Original languageEnglish (US)
Pages (from-to)354-360
Number of pages7
JournalJournal of Investigative Dermatology
Issue number2
StatePublished - Feb 2013

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology

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