VTI-1002 is a potent and specific inhibitor of human (K i = 4.4 ± 2.0 nM) and murine (IC 50 = 179 ± 18 nM) GzmB, with minimal activity (IC 50 > 300 nM) against Cathepsin-G, neutrophil elastase and caspases (−3, −4, −5, −7, −8 and −9). In addition to its high specificity for GzmB, VTI-1002 is retained in murine skin for up to 24 hours and exhibits minimal toxicity in vivo with no observed adverse effects after 30 consecutive days of systemic administration in mice [31]. VTI-1002-mediated GzmB inhibition was first reported to augment type I collagen fibrillogenesis and improve tensile strength in a murine diabetic burn model, notably by preventing decorin cleavage and dermal fibrillar collagen network disorganization.
