STING inhibitor 1

C-176 (STING inhibitor 1) is a STING inhibitor with selectivity and blood-brain barrier permeability. C-176 inhibits STING-mediated IFNβ production and possesses anti-inflammatory activity.

diABZI STING agonist-1 (trihydrochloride) is a stimulator of interferon genes (STING) receptor agonist.

GSK-690693 is a pan-Akt inhibitor targeting Akt1 2 3 with IC50 of 2 nM 13 nM 9 nM, also sensitive to the AGC kinase family: PKA, PrkX and PKC isozymes. Phase 1.

STING agonist-1 (G10) is a human-specific agent that elicits antiviral activity against emerging Alphaviruses.

STING-IN-10 (P8) serves as both a dual degrader and inhibitor of STING, exhibiting an impressive DC50 value of 2.58 μM in THP-1 cells. This compound also demonstrates anti-inflammatory activity.

Enpp-1-IN-25 (Compound 30) is an ENPP1 inhibitor with an IC50 of 8.05 nM and exhibits low oral bioavailability. By inhibiting cGAMP degradation, it effectively activates the intracellular STING pathway. Enpp-1-IN-25 can enhance immune cell infiltration and type I interferon response in the tumor microenvironment, thereby increasing the antitumor efficacy of anti-PD-L1 antibodies. It is applicable for research in cancer immunotherapy.

GHN105 is an orally active STING inhibitor that suppresses STING-dependent IFN-β secretion in THP-1 human monocytes with an IC50 of 4.4 μM. In mice, GHN105 reduces serum levels of IFN-β, IL-6, and CXCL10, and alleviates colitis in a DSS-induced acute colitis mouse model. Additionally, GHN105 demonstrates favorable pharmacokinetic properties in mice, with an oral bioavailability of 43% and a half-life of 1.1 hours.

3,3'-((2-Chlorophenyl)methylene)bis(4-hydroxy-2H-chromen-2-one) is a non-nucleotide inhibitor of ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1; Ki = 50 μM).1,2 It also inhibits urease (IC50 = 84.53 μM for the Jack bean enzyme).3 |1. Choudhary, M.I., Fatima, N., Khan, K.M., et al. New biscoumarin derivatives-cytotoxicity and enzyme inhibitory activities. Bioorg. Med. Chem. 14(23), 8066-8072 (2006).|2. Onyedibe, K.I., Wang, M., and Sintim, H.O. ENPP1, an old enzyme with new functions, and small molecule inhibitors - A STING in the tale of ENPP1. Molecules 24(22), E4192 (2019).|3. Khan, K.M., Iqbal, S., Lodhi, M.A., et al. Biscoumarin: New class of urease inhibitors; economical synthesis and activity. Bioorg. Med. Chem. 12(8), 1963-1968 (2004).

CAY10761 is an inhibitor of ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1; IC50s = 467 and 429 μM for the human and snake venom enzymes, respectively).1,2 It also inhibits mushroom tyrosinase (Ki = 1.9 μM) and urease from jack bean, P. mirabilis, and B. pasteurii (IC50s = 0.093, <0.125, and 0.089 mM, respectively, at pH 8.2).3,4 |1. Khan, K.M., Fatima, N., Rasheed, M., et al. 1,3,4-Oxadiazole-2(3H)-thione and its analogues: A new class of non-competitive nucleotide pyrophosphatases/phosphodiesterases 1 inhibitors. Bioorg. Med. Chem. 17(22), 7816-7822 (2009).|2. Onyedibe, K.I., Wang, M., and Sintim, H.O. ENPP1, an old enzyme with new functions, and small molecule inhibitors - A STING in the tale of ENPP1. Molecules 24(22), E4192 (2019).|3. Ghani, U., and Ullah, N. New potent inhibitors of tyrosinase: Novel clues to binding of 1,3,4-thiadiazole-2(3H)-thiones, 1,3,4-oxadiazole-2(3H)-thiones, 4-amino-1,2,4-triazole-5(4H)-thiones, and substituted hydrazides to the dicopper active site. Bioorg. Med. Chem. 18(11), 4042-4048 (2010).|4. Amtul, Z., Rasheed, M., Choudhary, M.I., et al. Kinetics of novel competitive inhibitors of urease enzymes by a focused library of oxadiazoles/thiadiazoles and triazoles. Biochem. Biophys. Res. Commun. 319(3), 1053-1063 (2004).

STING agonist 1a is an agonist of stimulator of interferon genes (STING).1It induces expression of an IRF-inducible SEAP reporter gene in a cell-based assay (EC50= 16.77 μM). STING agonist 1a (12.5-100 μM) induces expression of IFN-β, IL-6, and chemokine (C-X-C motif) ligand 10 (CXCL10) in THP-1 cells, an effect that can be reversed by STING knockout or the STING inhibitor H-151 . 1.Hou, H., Yang, R., Liu, X., et al.Discovery of triazoloquinoxaline as novel STING agonists via structure-based virtual screeningBioorg. Chem.100103958(2020)

STING modulator-3 is a STING inhibitor with a Ki value of 43.1 nM in scintillation proximity assays, specifically targeting R232 STING. It does not affect IRF-3 activation or TNF-β induction in THP-1 cells.

STING-IN-6 (compound 50), a potent inhibitor of STING, exhibits a pIC50 value of 8.9, indicating its significant inhibitory capacity. This compound holds promise for research in immunity [1].

STING-IN-5, a potent inhibitor of the Stimulator of Interferon Genes (STING) pathway, significantly suppresses lipopolysaccharide (LPS)-induced nitric oxide (NO) synthesis in macrophages, exhibiting an IC50 of 1.15 μM. This compound dampens the inflammatory response and offers potential for research into anti-inflammatory diseases and sepsis [1].

LB244, a homologue of BB-Cl-amidine, functions as an orally effective STING inhibitor with an EC50 value of 0.8 μM, applicable in the treatment of STING-dependent inflammatory diseases. However, pharmacokinetic studies have shown that LB244 exhibits limited oral activity in mice [1].

STING-IN-7 (compound 21) is a potent inhibitor of the stimulator of interferon genes (STING) pathway, with an inhibitory concentration (IC50) of 11.5 nM, effectively hampering the phosphorylation of both STING and interferon regulatory factor 3 (IRF3) [1].

S-72 acts as a microtubule polymerization inhibitor, effective in cell-free assays at concentrations of 1, 3, and 10 µM. At nanomolar levels (IC50s = 15.64 and 26.32 nM, respectively), it diminishes the viability of both MCF-7 and paclitaxel-resistant MCF-7/T breast cancer cells. Moreover, at 50 nM, S-72 impedes migration, invasion, and wound healing in these cell lines. Additionally, at 100 nM, it arrests the cell cycle at the G2/M phase and induces apoptosis in MCF-7/T cells, while also inhibiting stimulator of interferon genes (STING) activation. In vivo, S-72 dosage at 15 mg/kg per day curtails tumor growth in mouse xenograft models of paclitaxel-resistant breast cancer, specifically MCF-7/T and MX-1/T.

Enpp-1-IN-19 (compound 29f) is an orally active inhibitor of ENPP1 that effectively blocks cGAMP hydrolysis with an IC50 of 68 nM. It not only enhances anti-PD-L1 responses and curtails tumor growth in CT26 syngeneic models but also boosts STING-mediated type I interferon responses. Additionally, Enpp-1-IN-19 fosters immune memory and aids in preventing tumor recurrence [1].

SB24011, a STING-TRIM29 interaction inhibitor, has an IC₅₀ value of 3.85 μM. It boosts STING immunity by upregulating STING protein levels, thereby enhancing the immunotherapeutic effects of STING agonists and anti-PD-1 antibodies through systemic anticancer immunity [1].

SU0268 is a potent and specific 8-Oxoguanine DNA glycosylase 1 (OGG1) inhibitor that regulates inflammatory responses during Pseudomonas aeruginosa infection.