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Levels of proMMP‐2 and proMMP‐9 in serum samples from healthy and COPD smokers. Representative gelatin zymograms of two samples from each group are shown. Controls include (a) proMMP‐9 and proMMP‐9/NGAL, and (b) proMMP‐2/MMP‐9 and active MMP‐2/MMP‐9. Expression profiles of proMMP‐2/MMP‐9 and the proMMP‐9/NGAL complex in sera (5 μl) for healthy smokers and COPD smokers (GOLD I‐IV).
