NGAL (also known as Lipocalin - 2 or Neutrophil Gelatinase - associated Lipocalin) is a small, ~ 25kDa secreted protein expressed in epithelial tissues and released into both urine and blood upon kidney tubular damage. (enzolifesciences.com)
Matrix metalloproteinases 2 and 9 (MMP - 2, MMP - 9), commonly named gelatinases, are two key extracellular enzymes involved in ECM remodeling, which is an essential step required not only for angiogenesis, but also for metastasis [32], [33], [34]. (journals.plos.org)
An in situ activity assay with HT - 1080 gelatinases (Figure 8 B) shows that this is not a direct effect on the enzyme. (journals.plos.org)