Conditional Activin Receptor Type 1B (Acvr1b) Knockout Mice Reveal Hair Loss Abnormality

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2010 Dec 31

PMID 21191412

Citations 32

Authors

Wanglong Qiu

Xiaojun Li

Hongyan Tang

Alicia S Huang

Andrey A Panteleyev

David M Owens

Gloria H Su

Affiliations

Soon will be listed here.

Abstract

The in vivo functions of the activin A receptor type 1b (Acvr1b) have been difficult to study because Acvr1b(-/-) mice die during embryogenesis. To investigate the roles of Acvr1b in the epithelial tissues, we created mice with a conditional disruption of Acvr1b (Acvr1b(flox/flox)) and crossed them with K14-Cre mice. Acvr1b(flox/flox); K14-Cre mice displayed various degrees of hairlessness at postnatal day 5, and the phenotype is exacerbated by age. Histological analyses showed that those hair follicles that developed during morphogenesis were later disrupted by delays in hair cycle reentry. Failure in cycling of the hair follicles and regrowth of the hair shaft and the inner root sheath resulted in subsequent severe hair loss. Apart from previous reports of other members of the transforming growth factor-β/activin/bone morphogenic protein pathways, we demonstrate a specialized role for Acvr1b in hair cycling in addition to hair follicle development. Acvr1b(flox/flox); K14-Cre mice also had a thicker epidermis than did wild-type mice, which resulted from persistent proliferation of skin epithelial cells; however, no tumor formation was observed by 18 months of age. Our analysis of this Acvr1b knockout mouse line provides direct genetic evidence that Acvr1b signaling is required for both hair follicle development and cycling.

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