Total gelatinase activity for matrix metalloproteinase (MMP)-9 and MMP-2 in cell-free bronchoalveolar lavage (BAL) fluid samples harvested from vehicle(Veh)- and endotoxin(E)-exposed bronchial segments in healthy subjects.

Footnote. Zymographic activity of MMP-9 and MMP-2 measured using densitometry and expressed in arbitrary units. The BAL fluid samples were harvested 24 (n = 11) or 48 (n = 7) hours (h) after exposure to vehicle (Veh) or endotoxin (E). Individual ratios for MMP-9 and MMP-2 activity for each segment were calculated and are shown in the bottom row. All values are shown as medians with range. Asterisks indicate statistically significant differences between the total activities of MMP-9 and MMP-2, for endotoxin- and vehicle-exposed segments, respectively (* = p