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ENPP1 inhibitor with ultralong drug-target residence time as an innate immune checkpoint blockade cancer therapy #MMPMID40914167
Wang S; Johnson RM; Carozza JA; Fernandez D; Scicinski J; Verity NA; Mardjuki R; Cao X; Guo Y; Papkoff J; Ray N; Li L
Cell Rep Med 2025[Aug]; ä (ä): 102336 PMID40914167show ga
Only one in five patients respond to immune checkpoint inhibitors, which primarily target adaptive immunity. Ectonucleotide pyrophosphatase/phophodiesterase 1 (ENPP1), the dominant hydrolase of 2'3'-cyclic-GMP-AMP (cGAMP) that suppresses downstream stimulator of interferon genes (STING) signaling, has emerged as a promising innate immunotherapy target. However, existing ENPP1 inhibitors have been optimized for prolonged systemic residence time rather than effective target inhibition within tumors. Here, we report the characterization of STF-1623, a highly potent ENPP1 inhibitor with an exceptionally long tumor residence time despite rapid systemic clearance, enabled by its high ENPP1 binding affinity and slow dissociation rate. We show that membrane-bound ENPP1 on tumor cells, not the abundant soluble ENPP1 in serum, drives tumor progression. Consequently, STF-1623 unleashes anti-tumor immunity to produce robust anti-tumor and anti-metastatic effects across multiple tumor models. Conceptually, this work establishes a noncovalent small-molecule inhibitor of ENPP1 with ultralong drug-target engagement as a safe and precise strategy to activate STING within tumors.