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Experimental pulmonary inflammatory injury in the monkey.

S D Revak¹, C L Rice, I U Schraufstätter

¹Department of Immunology, Scripps Clinic and Research Foundation, La Jolla, CA 92037, USA.

The Journal of Clinical Investigation

|September 1, 1985

Summary

This study shows that acute pulmonary inflammation in rhesus monkeys generates both proteases and oxidants. These inflammatory mediators contribute to lung injury, as evidenced by increased protein and enzyme levels in bronchoalveolar lavage fluid.

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Area of Science:

Pulmonary Medicine
Inflammation Research
Biochemistry

Background:

Acute inflammatory lung injury is a significant clinical concern.
Understanding the molecular mechanisms of lung injury is crucial for developing effective treatments.

Purpose of the Study:

To investigate the generation of proteases and oxidants during induced inflammatory pulmonary injury in a primate model.
To characterize the biochemical changes in bronchoalveolar lavage (BAL) fluid associated with lung inflammation.

Main Methods:

Induction of pulmonary inflammation in rhesus monkeys using formylated peptide (FNLP) or phorbol myristate acetate (PMA).
Analysis of BAL fluid for protein content, cellular infiltration, enzyme activity (neutrophil elastase, beta-glucuronidase, myeloperoxidase), and oxidant generation.

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Assessment of alpha 1-protease inhibitor (alpha 1-PI) activity and catalase levels.

Main Results:

Inflammatory injury led to increased BAL fluid protein, neutrophil infiltration, and elevated levels of neutrophil elastase, beta-glucuronidase, and myeloperoxidase.
Evidence of protease activity was observed, including cleavage of prekallikrein and amidolytic activity.
Decreased alpha 1-PI specific activity and catalase specific activity indicated oxidant generation and damage in the BAL fluid.
Myeloperoxidase inhibition by 3-amino, 1,2,4 triazole (AT) was H2O2 dependent.

Conclusions:

The experimental primate model effectively replicates acute inflammatory pulmonary injury.
Both proteases and oxidants are generated during the establishment of acute lung inflammation.
These findings highlight the complex biochemical processes involved in inflammatory lung injury.