Structure-based virtual screening and in vitro validation of inhibitors of cyclic dinucleotide phosphodiesterases ENPP1 and CdnP

被引:1
作者
Rohilla, Akshay [1 ,2 ]
Singh, Alok Kumar [1 ,2 ]
Koleske, Benjamin [1 ,2 ]
Srikrishna, Geetha [1 ,2 ]
Bishai, William R. [1 ,2 ]
机构
[1] Johns Hopkins Univ, Sch Med, Dept Med, Baltimore, MD 21218 USA
[2] Johns Hopkins Univ, Sch Med, Ctr TB Res, Baltimore, MD 21218 USA
来源
MICROBIOLOGY SPECTRUM | 2024年 / 12卷 / 01期
关键词
Mycobacterium tuberculosis; cyclic dinucleotide phosphodiesterase; immune evasion; host-directed therapy; MYCOBACTERIUM-TUBERCULOSIS; CYTOSOLIC SURVEILLANCE; STING PATHWAY; DNA; INFLAMMATION; INTERFERONS; POTENT; SENSOR; CGAMP;
D O I
10.1128/spectrum.02012-23
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Cyclic GMP-AMP synthase (cGAS) and stimulator of interferon genes (STING) are intracellular mediators of innate immune responses to cytosolic pathogen-derived and host DNA. STING agonists designed to mimic the natural host STING ligand, 2 ',3 '-cyclic GMP-AMP (cGAMP), are promising immunotherapeutic tools for infectious diseases and solid tumor immunotherapy. We previously characterized CdnP (Rv2837c), a specific phosphodiesterase (PDE) deployed by Mycobacterium tuberculosis (M.tb), as an enzyme that blunts host immunity by directly cleaving bacterial-derived c-di-AMP and host-derived 2 ',3 '-cGAMP. We hypothesized that small molecule inhibitors of bacterial and host cyclic dinucleotide PDEs, namely CdnP and the endogenous host PDE, ENPP1, might potentiate the STING pathway and act as host-directed therapies (HDTs) for tuberculosis. To this end, we employed virtual screening of an NCI compound library customized for improved oral drug properties to identify potential inhibitors of CdnP and ENPP1. Compounds identified in silico were tested for their inhibitory activity against purified CdnP and ENPP1. Using biochemical and cell-based assays, we identified compounds with low IC50 values against both PDEs. We validated increased cGAS-STING signaling in primary human macrophages exposed to 2 ',3 '-cGAMP in the presence of a lead ENPP1 inhibitor, E-3 (NCI-14465). Our studies provide a framework for novel HDTs that target the cGAS-STING pathway to promote M.tb containment and anti-tumor immunity.
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页数:17
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