LYPLAL1-IN-1 (compound 11) is a selective, covalent, and irreversible inhibitor of the lysophospholipase-like enzyme LYPLAL1 (IC50 = 6 nM). LYPLAL1-IN-1 shows selectivity against other serine hydrolases such as carboxylesterase CES1 (IC50 > 50 µM for CES1). LYPLAL1-IN-1 inhibits the depalmitoylation function of LYPLAL1, blocking its depalmitoylation modification of cyclic GMP-AMP synthase (cGAS), thereby promoting cGAS dimerization and activation, and initiating the cGAS-STING pathway-mediated innate immune response. LYPLAL1-IN-1 can enhance DNA-induced type I interferon production, upregulate PD-L1 expression in tumor cells, and promote the accumulation of tumor-infiltrating CD8+ T cells, with the core function of strengthening the anti-tumor immune response. LYPLAL1-IN-1 is primarily used in tumor immunology research, especially in combination with PD-1/PD-L1 inhibitors[1][2].
