G Mautino, N Oliver, P Chanez, J Bousquet and F Capony
INSERM U 454 and Clinique des Maladies Respiratoires, Hopital Arnaud de Villeneuve, Montpellier, France.

In order to determine whether matrix metalloproteinases (MMPs) contribute to inflammation in asthma, we have examined the release of MMPs in bronchoalveolar lavage (BAL) fluids and their production and regulation by alveolar macrophages (AM), in short-term culture. BAL was collected from 38 asthmatic subjects (24 untreated and 14 treated with inhaled corticosteroids), 26 healthy nonsmokers, and 18 patients with chronic bronchitis used as a control group for another inflammation. The profile of MMPs present in BAL fluid and AM supernatant, determined by zymographic analysis, was found to be similar in all populations. The main enzyme released was identified immunologically as MMP-9, a potent collagenolytic and elastolytic enzyme. Its release, measured using enzyme immunoassay, was significantly enhanced in fluids and in AM supernatants from untreated asthmatics compared with those from the other populations. Enhanced MMP-9 levels, in asthma, could not be explained by a different sensitivity of AM to interleukin-4, interferon- gamma, or dexamethasone, compounds that have been shown to inhibit MMP- 9. The phorbol ester phorbol 12-myristate 13-acetate (PMA), a protein kinase C (PKC) activator, significantly increased MMP-9 in AM from healthy control subjects but not in those from untreated asthmatics. Calphostin C and H7, PKC inhibitors, significantly reduced PMA- stimulated MMP-9 release in AM from healthy control subjects and spontaneous MMP-9 release in AM from untreated asthmatics. H8, a PKA inhibitor, was inactive in both populations. These data suggest that the stimulation of MMP-9 release in AM from untreated asthmatic patients occurs, at least partly, via signals activating PKC.

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