Igf1r signalling acts on the anagen-to-catagen transition in the hair cycle.

Abstract:

:Insulin-like growth factor 1 (Igf1) is important for skin development and homoeostasis. However, overexpression and inactivation studies have produced variable findings regarding its role in hair follicle (HF) biology. Here, we studied a conditional and inducible knockout of the Igf1 receptor (Igf1r) in keratin 15-expressing bulge cells. Deletion of Igf1r after the development of the skin appendages in K15-Igf1rKO mice showed no abnormalities in epidermal homoeostasis. Numbers of bulge cells were lower in K15-Igf1rKO mice than in controls, without consequences on wound healing, at least in young mice. K15-Igf1rKO HFs entered anagen phase earlier than controls and showed a delay in the anagen/catagen switch. The expression of Bmp-4 mRNA was inhibited in HFs from K15-Igf1rKO . MED1 transcription was impaired in the epidermis of K15-Igf1rKO mice. These findings suggest that Igf1r controls the hair cycle, partly through Bmp-4 activation.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Castela M,Linay F,Roy E,Moguelet P,Xu J,Holzenberger M,Khosrotehrani K,Aractingi S

doi

10.1111/exd.13287

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

785-791

issue

9

eissn

0906-6705

issn

1600-0625

journal_volume

26

pub_type

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