Direct Binding of the PH-Regulated Protein 1 (Pra1) from Inhibits Cytokine Secretion by Mouse CD4 T Cells

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2017 May 30

PMID 28553273

Citations 7

Authors

Arne Bergfeld

Prasad Dasari

Sandra Werner

Timothy R Hughes

Wen-Chao Song

Peter Hortschansky

Axel A Brakhage

Thomas Hunig

Peter F Zipfel

Niklas Beyersdorf

Affiliations

Soon will be listed here.

Abstract

Opportunistic infections with the saprophytic yeast are a major cause of morbidity in immunocompromised patients. While the interaction of cells and molecules of innate immunity with has been studied to great depth, comparatively little is known about the modulation of adaptive immunity by . In particular, direct interaction of proteins secreted by with CD4 T cells has not been studied in detail. In a first screening approach, we identified the pH-regulated antigen 1 (Pra1) as a molecule capable of directly binding to mouse CD4 T cells . Binding of Pra1 to the T cell surface was enhanced by extracellular Zn ions which Pra1 is known to scavenge from the host in order to supply the fungus with Zn. stimulation assays using highly purified mouse CD4 T cells showed that Pra1 increased proliferation of CD4 T cells in the presence of plate-bound anti-CD3 monoclonal antibody. In contrast, secretion of effector cytokines such as IFNγ and TNF by CD4 T cells upon anti-CD3/ anti-CD28 mAb as well as cognate antigen stimulation was reduced in the presence of Pra1. By secreting Pra1 , thus, directly modulates and partially controls CD4 T cell responses as shown in our assays.

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