Inhibition of NE activity by sivelestat was confirmed by incubating 1 μM NE and 10 μM Suc-Ala-Ala-Ala-MCA substrate (MAA-3133-v; Peptides International) with or without 1 μM sivelestat for 90 min at 37°C. Substrate fluorescence was measured every 5 min as an indicator of NE activity at excitation/emission wavelengths of 380/460 nm, using a Tecan Infinite M1000 multiplate reader.
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