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. 1996 Feb;117(4):667–674. doi: 10.1111/j.1476-5381.1996.tb15242.x

Augmentation by eosinophils of gelatinase activity in the airway mucosa: comparative effects as a putative mediator of epithelial injury.

C A Herbert 1, M J Arthur 1, C Robinson 1
PMCID: PMC1909334  PMID: 8646412

Abstract

1. We have studied the release of gelatin-degrading enzymes from isolated sheets of bronchial mucosa in the presence and absence of eosinophils. 2. Isolated sheets of bovine bronchial mucosa released gelatin-degrading activity in similar amounts from both the apical and basolateral aspects of the tissue. Gelatinolytic activity could not be increased by treatment of the mucosal sheets with calcium ionophore, A23187. 3. The activity of the released gelatinases could be inhibited by chelation of divalent cations or by the matrix metalloproteinase inhibitors, BB-94 and BB-250. However, inhibitors of serine proteinases, or of cysteine proteinases were without effect. In zymography, major bands of gelatin-degrading activity consistent with gelatinases A and B were identified. 4. Addition of guinea-pig eosinophils to the basolateral aspect of bronchial mucosa for 60 min resulted in an increase in the gelatinolytic activity of the conditioned medium, irrespective of whether the eosinophils were stimulated with ionophore A23187 or not. However, only ionophore-stimulated eosinophils reacted to produce sufficient tissue damage to increase the transepithelial flux of serum albumin. 5. Purified eosinophils were a poor source of gelatinolytic activity, indicating that when interacting with the bronchial mucosa their effect is to increase the apparent release and/or activation of gelatinases derived from the airway mucosa. 6. After organomercurial activation, recombinant human progelatinase A increased the permeability of the bronchial mucosa to mannitol. However, the activity of enzyme and duration of exposure required to do this were greater than the amounts of gelatinase activity detected during eosinophil-mediated injury. Sheets of airway mucosa were also resistant to injury evoked by high concentrations of hydrogen peroxide or plasmin. 7. Collectively, these results suggest that if gelatinases are involved in eosinophil-mediated injury and repair of the bronchial mucosa, they require other mediators to act in concert to bring about outright epithelial cell detachment. This does not preclude the possibility that gelatinases are crucial in rendering the airway mucosa hyperfragile.

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Selected References

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