Volume 19, Issue 2 pp. 280-287
ORIGINAL ARTICLE

Altered sputum granzyme B and granzyme B/proteinase inhibitor-9 in patients with non-eosinophilic asthma

Jodie L Simpson

Jodie L Simpson

Centre for Asthma and Respiratory Disease, The University of Newcastle, Newcastle, New South Wales, Australia

Department of Respiratory and Sleep Medicine, John Hunter Hospital, Hunter Medical Research Institute, Newcastle, New South Wales, Australia

Search for more papers by this author
Peter G Gibson

Peter G Gibson

Centre for Asthma and Respiratory Disease, The University of Newcastle, Newcastle, New South Wales, Australia

Department of Respiratory and Sleep Medicine, John Hunter Hospital, Hunter Medical Research Institute, Newcastle, New South Wales, Australia

Search for more papers by this author
Ian A Yang

Ian A Yang

School of Medicine, The University of Queensland, Brisbane, Queensland, Australia

The Prince Charles Hospital, Brisbane, Queensland, Australia

Search for more papers by this author
John Upham

John Upham

School of Medicine, The University of Queensland, Brisbane, Queensland, Australia

Princess Alexandra Hospital, Brisbane, Queensland, Australia

Search for more papers by this author
Alan James

Alan James

Sir Charles Gairdner Hospital, Perth, Western Australia, Australia

Search for more papers by this author
Paul N Reynolds

Paul N Reynolds

Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, South Australia, Australia

Lung Research Laboratory, Hanson Institute, Adelaide, South Australia, Australia

Joint Senior Authorship: Paul N Reynolds and Sandra Hodge contributed equally to this work.Search for more papers by this author
Sandra Hodge

Corresponding Author

Sandra Hodge

Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, South Australia, Australia

Lung Research Laboratory, Hanson Institute, Adelaide, South Australia, Australia

Joint Senior Authorship: Paul N Reynolds and Sandra Hodge contributed equally to this work.Correspondence: Sandra Hodge, Lung Research, Hanson Institute, Frome Road, Adelaide, SA 5001, Australia. Email: [email protected]Search for more papers by this author
AMAZES Study Research Group

AMAZES Study Research Group

Search for more papers by this author
First published: 23 December 2013
Citations: 8
(Associate Editor: Claire Wainwright).

Abstract

Background and objective

The non-eosinophilic phenotype of asthma (NEA) is associated with chronic airway inflammation and airway neutrophilia. An accumulation of apoptotic airway epithelial cells, if not efficiently cleared by efferocytosis, can undergo secondary necrosis, with the potential for inflammation of surrounding tissues. Apoptosis may occur via the T cell granzyme B pathway. The role of granzyme B in NEA is not known. The aim of this study was to investigate production of granzyme B and its inhibitor proteinase inhibitor (PI)-9 by T cells from induced sputum and compare expression between eosinophilic, NEA and healthy controls.

Methods

We investigated T cell intracellular granzyme B and its inhibitor, PI-9, in sputum from healthy control subjects (n = 10), and patients with NEA (n = 22) or eosinophilic asthma (EA) (n = 15) using flow cytometry.

Results

Granzyme B expression and the ratio of granzyme B to PI-9 positive cells were highest in those with NEA for both CD3+ and CD4+ T cells. The expression of granzyme B was not statistically different between patients with NEA and EA; however, the ratio of granzyme B to PI-9 positive cells for CD3+ T cells was significantly higher in those with NEA compared with EA.

Conclusions

Induced sputum provides a non-invasive tool for investigating T cell cytotoxic mediators in the various asthma subtypes. Granzyme B expression is increased in NEA and the contribution of granzyme B to chronic inflammation requires further study.

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