Volume 73, Issue 2 pp. 405-415
ORIGINAL ARTICLE

Mast cells and sphingosine-1-phosphate underlie prelesional remodeling in a mouse model of eczema

P. A. Wedman

P. A. Wedman

Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA

Search for more papers by this author
A. Aladhami

A. Aladhami

Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA

University of Baghdad, Baghdad, Iraq

Search for more papers by this author
A. P. Chumanevich

A. P. Chumanevich

Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA

Search for more papers by this author
J. W. Fuseler

J. W. Fuseler

Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA

Search for more papers by this author
C. A. Oskeritzian

Corresponding Author

C. A. Oskeritzian

Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA

Correspondence

Carole A. Oskeritzian, Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA.

Email: [email protected]

Search for more papers by this author
First published: 14 September 2017
Citations: 16
Edited by: Angela Haczku

Abstract

Background

Atopic dermatitis (AD) is a chronic skin inflammation that affects children and adults worldwide, but its pathogenesis remains ill-understood.

Methods

We show that a single application of OVA to mouse skin initiates remodeling and cellular infiltration of the hypodermis measured by a newly developed computer-aided method.

Results

Importantly, we demonstrate that skin mast cell (MC) activation and local sphingosine-1-phosphate (S1P) are significantly augmented after OVA treatment in mice. Deficiency in sphingosine kinase (SphK)1, the S1P-producing enzyme, or in MC, remarkably mitigates all signs of OVA-mediated remodeling and MC activation. Furthermore, skin S1P levels remain unchanged in MC-deficient mice exposed to OVA. LPS-free OVA does not recapitulate any of the precursor signs of AD, supporting a triggering contribution of LPS in AD that, per se, suffice to activate local MC and elevate skin S1P.

Conclusion

We describe MC and S1P as novel pathogenic effectors that initiate remodeling in AD prior to any skin lesions and reveal the significance of LPS in OVA used in most studies, thus mimicking natural antigen (Ag) exposure.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.