2. Signaling Pathways
  3. Metabolic Enzyme/Protease
  4. Indoleamine 2,3-Dioxygenase (IDO)

Indoleamine 2,3-Dioxygenase (IDO)

Indoleamine 2,3-Dioxygenase (IDO)

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Indoleamine 2, 3-dioxygenase (IDO) is an inflammatory cytokine-inducible rate-limiting enzyme of the tryptophan (Trp) catabolism, which is involved in the inhibition of intracellular pathogen replication as well as in immunomodulation. To date, three types of tryptophan-metabolizing enzymes have been identified: IDO1, IDO2 and tryptophan 2,3-dioxygenase 2.

IDO is an intracellular enzyme that is constitutively expressed in several human and mouse cells. Being present in innate immune cells, such as Mos and dendritic cells (DCs), IDO catalyzes the initial rate-limiting step of tryptophan (Trp) catabolism, thus leading to the production of immunoregulatory catabolites (collectively known as kynurenines).

The IDO gene promoter contains multiple sequence elements that confer responsiveness to proinflammatory mediators, thereby demonstrating the strong correlation between inflammation and induced IDO expression.

Indoleamine 2,3-Dioxygenase (IDO) Isoform Specific Products:

Indoleamine 2,3-Dioxygenase (IDO) Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-146261
    HI5
    		Inhibitor
    HI5 is a potent tublin and IDO inhibitor, with an IC50 value of 70 nM in HeLa cells. HI5 inhibit IDO expression and decrease kynurenine production, leading to stimulating T cells activation and proliferation. HI5 can inhibit tubulin polymerization and cell migration, cause G2/M phase arrest, and induce apoptosis via the mitochondrial dependent apoptosis pathway and cause reactive oxidative stress generation in HeLa cells. HI5 can be used for researching anticancer.
    HI5
  • HY-146215
    IDO1-IN-20
    Hy-146215 is an enzyme that catalyzes the oxidative metabolism of tryptophan. It can immunosuppress tumors in the tumor microenvironment.
    IDO1-IN-20
  • HY-149227
    IDO1-IN-21
    		Inhibitor
    IDO1-IN-21 (compound 10m) is an IDO1 inhibitor (IC50 = 0.64 μM). IDO1-IN-21 effectively inhibits tumor growth in mice.
    IDO1-IN-21
  • HY-173067
    IDO1 ligand-1
    IDO1 ligand-1 is the target protein ligand of PROTAC NU227326 (HY-173066). NU227326 can be used to degrade IDO1.
    IDO1 ligand-1
  • HY-144273
    IDO1-IN-13
    		Inhibitor
    IDO1-IN-13 (compound 27a) is a potent IDO1 inhibitor with an IC50 of 61.6 nM. IDO1-IN-13 has cellular IDO1 inhibition (HeLa EC50= 30 nM). IDO1-IN-13 decreases 51% of the kyn/trp ratio in SK-OV-3 xenograft tumor tissues.
    IDO1-IN-13
  • HY-158334
    NDs-IN-1
    		Inhibitor
    (Neurodegenerative diseases) NDs-IN-1 (Compound 3g) inhibits the activities of key enzymes such as hBACE-1, hAChE and hMAO-B. NDs-IN-1 is a novel non-covalent multi-target inhibitor. NDs-IN-1 is mainly used in the study of neurodegenerative diseases.
    NDs-IN-1
  • HY-W770206
    IDO-IN-7-d10
    IDO-IN-7-d10 (NLG-919 analogue-d10; GDC-0919 analogue-d10) is the deuterium labeled IDO-IN-7 (HY-13983). IDO-IN-7 (NLG-919 analogue) is a a potent IDO1 inhibitor with an IC50 of 38 nM.
    IDO-IN-7-d<sub>10</sub>
  • HY-144778
    IDO1/TDO-IN-1
    		Inhibitor
    IDO1/TDO-IN-1 (30) is a potent dual IDO1 (uncompetitive, Ki of 0.23 μM) and TDO (competitive, Ki of 0.73 μM) inhibitor. IDO1/TDO-IN-1 (30) significantly promotes cell apoptosis through the potential mitochondria-mediated Bcl-2/Bax pathway.
    IDO1/TDO-IN-1
  • HY-163520
    IDO1-IN-24
    		Inhibitor
    IDO1-IN-24 (compound 2c) inhibits IDO1 production in cell-based assay with an IC50 value of 17 μM.
    IDO1-IN-24
  • HY-173023
    IDOi-Pt(IV) prodrug-1
    		Inhibitor
    IDOi-Pt(IV) prodrug-1 (Compound 10) is an IDOi-Pt(IV) prodrug. IDOi-Pt(IV) prodrug-1 inhibits IDO expression. IDOi-Pt(IV) prodrug-1 induces apoptosis, decreases the mitochondrial membrane potential, inhibits tumor cell migration and invasion. IDOi-Pt(IV) prodrug-1 induces reactive oxygen species-mediated endoplasmic reticulum stress and secretion of damage-associated molecular patterns (DAMPs), thereby presenting immunogenic cell death (ICD) effects. IDOi-Pt(IV) prodrug-1 has high-efficiency and low-toxicity antitumor effects compared to Cisplatin (HY-17394).
    IDOi-Pt(IV) prodrug-1
  • HY-151886
    NU223612
    		Inhibitor
    NU223612 is a potent PROTAC (PROTACs) that degrades indoleamine 2,3-dioxygenase 1 (IDO1) (Indoleamine 2,3-Dioxygenase (IDO)) with a Kd of 640 nM. NU223612 potently degrades the IDO1 protein through CRBN-mediated proteasomal degradation. NU223612 is bound to CRBN with an affinity of 290 nM. NU223612 can cross the blood-brain barrier (BBB).
    NU223612
  • HY-154387
    1-Isopropyltryptophan
    		Inhibitor
    1-Isopropyltryptophan (1-IsoPT) is a IDO1 inhibitor. 1-Isopropyltryptophan decreases the expression of IFN-γ stimulated ID0-1 and ID0-2 mRNA.
    1-Isopropyltryptophan
  • HY-175182
    IDO1-IN-27
    		Inhibitor
    IDO1-IN-27 (Compound I-1) is a Indoleamine 2,3-Dioxygenase 1 (IDO1) inhibitor with an IC50 of 0.3951  μM for recombinant hIDO1. IDO1-IN-27 also inhibits hIDO1 expression in HeLa cells (EC50: 62 nM). IDO1-IN-27 effectively stimulates T cell proliferation by reducing the mRNA expression of pro-inflammatory factors (TNF-α, IL-6, and IL-1β) while concurrently inhibiting LLC cells growth.
    IDO1-IN-27
  • HY-144465
    IDO1-IN-15
    		Inhibitor
    IDO1-IN-15 is a potent IDO1 inhibitor (IC50=127 nM). IDO1-IN-15 has comparable potency against IDO1 enzyme in vitro with Epacadostat.
    IDO1-IN-15
  • HY-N0110R
    Palmatine chloride (Standard)
    		Inhibitor
    Palmatine (chloride) (Standard) is the analytical standard of Palmatine (chloride). This product is intended for research and analytical applications. Palmatine chloride is an orally active and irreversible indoleamine 2,3-dioxygenase 1 (IDO-1) inhibitor with IC50s of 3 μM and 157μM against HEK 293-hIDO-1 and rhIDO-1, respectively. Palmatine chloride can also inhibit West Nile virus (WNV) NS2B-NS3 protease in an uncompetitive manner with an IC50 of 96 μM. Palmatine chloride shows anti-cancer, anti-oxidation, anti-inflammatory, neuroprotection, antibacterial, anti-viral activities.
    Palmatine chloride (Standard)
  • HY-168092
    VS-15
    		Inhibitor
    VS-15, a IDO1 inhibitor, selectively binds the heme-free form of IDO1. VS-15 is described as an iNOS inhibitor based on the reduction of NO production.
    VS-15
  • HY-N11451
    Lacto-N-fucopentaose III
    		Activator
    Lacto-N-fucopentaose III (LNFP-III) is an immune modulator. Lacto-N-fucopentaose III reduces the severity of experimental autoimmune encephalomyelitis (EAE) and CNS inflammation.
    Lacto-N-fucopentaose III
  • HY-172874
    TDO-IN-2
    		Inhibitor
    TDO-IN-2 (Compound 5c) is an orally active TDO inhibitor (IC50: 1.25 μM). TDO-IN-2 has antitumor activity in the Hepa1-6 hepatocellular carcinoma allograft mouse model. TDO-IN-2 has synergistic effects with the PD-1/PD-L1 inhibitor BMS-202 (HY-19745) and can be used to study tumor immune tolerance.
    TDO-IN-2
  • HY-145355
    IDO1-IN-12
    		Inhibitor
    IDO1-IN-12 is a potent and orally available IDO1 inhibitor.
    IDO1-IN-12
  • HY-149982
    IDO1-IN-22
    		Inhibitor
    IDO1-IN-22 (Compound 3) is a IDO1 inhibitor (biochemical hIDO1 IC50: 67.4 nM, HeLa hIDO1 IC50: 17.6 nM). IDO1-IN-22 has excellent antitumor efficacy in LLC xenograft model, as well as desirable pharmacokinetic (PK) profile.
    IDO1-IN-22
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Indoleamine 2,3-Dioxygenase (IDO) Isoform Comparison

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