Semaphorin 7A is Expressed on Airway Eosinophils and Upregulated by IL-5 Family Cytokines

Overview

Journal Clin Immunol

Specialty Allergy & Immunology

Date 2013 Dec 17

PMID 24333536

Citations 30

Authors

Stephane Esnault

Elizabeth A Kelly

Mats W Johansson

Lin Ying Liu

Shih-Tsung Han

Moneeb Akhtar

Nathan Sandbo

Deane F Mosher

Loren C Denlinger

Sameer K Mathur

James S Malter

Nizar N Jarjour

Affiliations

Soon will be listed here.

Abstract

Semaphorin 7A (sema7a) plays a major role in TGF-β1-induced lung fibrosis. Based on the accumulating evidence that eosinophils contribute to fibrosis/remodeling in the airway, we hypothesized that airway eosinophils may be a significant source of sema7a. In vivo, sema7a was expressed on the surface of circulating eosinophils and upregulated on bronchoalveolar lavage eosinophils obtained after segmental bronchoprovocation with allergen. Based on mRNA levels in unfractionated and isolated bronchoalveolar cells, eosinophils are the predominant source of sema7a. In vitro, among the members of the IL-5-family cytokines, sema7a protein on the surface of blood eosinophils was increased more by IL-3 than by GM-CSF or IL-5. Cytokine-induced expression of cell surface sema7a required translation of newly synthesized protein. Finally, a recombinant sema7a induced alpha-smooth muscle actin production in human bronchial fibroblasts. semaphorin 7A is a potentially important modulator of eosinophil profibrotic functions in the airway remodeling of patients with chronic asthma.

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