Ablation of the Calcium-sensing Receptor in Keratinocytes Impairs Epidermal Differentiation and Barrier Function

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2012 May 25

PMID 22622426

Citations 47

Authors

Chia-Ling Tu

Debra A Crumrine

Mao-Qiang Man

Wenhan Chang

Hashem Elalieh

Michael You

Peter M Elias

Daniel D Bikle

Affiliations

Soon will be listed here.

Abstract

The calcium-sensing receptor (CaR) has an essential role in mediating Ca(2+)-induced keratinocyte differentiation in vitro. In this study, we generated keratinocyte-specific CaR knockout ((Epid)CaR(-/-)) mice to investigate the function of the CaR in epidermal development in vivo. (Epid)CaR(-/-) mice exhibited a delay in permeability barrier formation during embryonic development. Ion capture cytochemistry detected the loss of the epidermal Ca(2+) gradient in the (Epid)CaR(-/-) mice. The expression of terminal differentiation markers and key enzymes mediating epidermal sphingolipid transport and processing in the (Epid)CaR(-/-) epidermis was significantly reduced. The (Epid)CaR(-/-) epidermis displayed a marked decrease in the number of lamellar bodies (LBs) and LB secretion, thinner lipid-bound cornified envelopes, and a defective permeability barrier. Consistent with in vivo results, epidermal keratinocytes cultured from (Epid)CaR(-/-) mice demonstrated abnormal Ca(2+)(i) handling and diminished differentiation. The impairment in epidermal differentiation and permeability barrier in (Epid)CaR(-/-) mice maintained on a low calcium (0.02%) diet is more profound and persistent with age than in (Epid)CaR(-/-) mice maintained on a normal calcium (1.3%) diet. Deleting CaR perturbs the epidermal Ca(2+) gradient and impairs keratinocyte differentiation and permeability barrier homeostasis, indicating a key role for the CaR in normal epidermal development.

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