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Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

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Characterisation of eppin function: expression and activity in the lung.

Aaron Scott^1,2, Arlene Glasgow^1,2, Donna Small¹

¹Airway Innate Immunity Research Group, Centre for Experimental Medicine, Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, UK.

The European Respiratory Journal

|July 15, 2017

Summary

This summary is machine-generated.

Eppin, a protein found in reproductive tissues, is also present in the lungs and helps defend against inflammation. It reduces immune cell activity and inflammatory markers, suggesting a role in innate immunity.

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Area of Science:

Immunology
Protease Inhibition
Host Defense

Background:

Eppin (serine protease inhibitor) is primarily known for its expression in male reproductive tissues.
Its potential role as a multifunctional host defense protein requires further investigation.
Understanding eppin's expression and function in non-reproductive tissues is crucial.

Purpose of the Study:

To investigate the localization and regulation of eppin expression in myeloid and epithelial cells.
To explore eppin's potential role in the innate immune response, particularly in the lung.
To determine the effect of eppin on inflammatory pathways and cellular responses.

Main Methods:

Immunohistochemistry and Western blotting were used to detect eppin in lung tissues.
Monocytic cells were stimulated with various agonists to study eppin expression regulation.
Recombinant eppin was used to assess its effects on lipopolysaccharide (LPS)-induced inflammatory responses in vitro and in vivo.

Main Results:

Eppin was detected in the lungs of patients with acute respiratory distress syndrome and cystic fibrosis.
Epidermal growth factor upregulated eppin expression and secretion in monocytes.
Eppin inhibited LPS-induced chemokine production and NF-κB activation in monocytic cells.
In vivo, eppin administration reduced neutrophil recruitment and inflammatory chemokine levels in a mouse model of lung inflammation.

Conclusions:

Eppin plays a role in the innate immune response in the lung, extending beyond its known reproductive functions.
Eppin's anti-inflammatory properties suggest potential therapeutic applications in lung inflammatory diseases.
Further research into eppin's mechanisms of action could reveal novel host defense strategies.