MMP-9 Inhibitor I is primarily used in research settings to study the role of matrix metalloproteinase-9 (MMP-9) in various biological processes. It is particularly valuable in investigating conditions where MMP-9 activity is implicated, such as cancer metastasis, inflammatory diseases, and tissue remodeling. By inhibiting MMP-9, researchers can better understand its function in extracellular matrix degradation and cell migration, which are critical in tumor progression and wound healing. Additionally, this inhibitor is utilized in preclinical studies to evaluate potential therapeutic strategies targeting MMP-9-related pathways, offering insights into the development of treatments for diseases like arthritis, atherosclerosis, and certain types of cancer.