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-144466
    IDO1-IN-16
    		Inhibitor
    IDO1-IN-16 (I-1) is an IDO1 inhibitor targeting holo-IDO1, with an IC50 of 127 nM.
    IDO1-IN-16
  • HY-144274
    IDO1-IN-14
    		Inhibitor
    IDO1-IN-14 (compound 4a) is a potent IDO1 inhibitor with an IC50 of 396.9 nM. IDO1-IN-14 has cellular IDO1 inhibition (HeLa EC50=3393 nM).
    IDO1-IN-14
  • HY-178470
    IDO1/TDO-IN-10
    		Inhibitor
    IDO1/TDO-IN-10 (Compound G-14) is a dual IDO1 (EC50=3.07 μM) and TDO (EC50=9.7 μM) inhibitor. IDO1/TDO-IN-10 inhibits the conversion of tryptophan to kynurenine and modulates immune responses while reducing inflammatory reactions. IDO1/TDO-IN-10 is promising for research of cancers and inflammatory diseases.
    IDO1/TDO-IN-10
  • HY-15683R
    IDO5L (Standard)
    		Inhibitor
    IDO5L (Standard) is the analytical standard of IDO5L. This product is intended for research and analytical applications. IDO5L is a potent indoleamine 2,3-dioxygenase (IDO) inhibitor with an IC50 of 67 nM.
    IDO5L (Standard)
  • HY-108331R
    3-TYP (Standard)
    		Inhibitor
    3-TYP (Standard) is the analytical standard of 3-TYP (HY-108331). This product is intended for research and analytical applications. 3-TYP is an inhibitor of SIRT3 (IC50of 38 μM) and an inhibitor of Methionine Adenosyltransferase (MAT) 2 and Indoleamine 2,3-Dioxygenase (IDO). There may be many off-target sites for 3-TYP that need to be examined, such as NAD-dependent enzymes, including dehydrogenases.
    3-TYP (Standard)
  • HY-29268
    β-Carboline-1-carboxylic acid
    		Inhibitor
    β-Carboline 1-carboxylic acid is a β-carboline alkaloid with anti-inflammatory, antifibrotic, antitumor and antibacterial activities. β-Carboline 1-carboxylic acid is the cAMP phosphodiesterase (IC50: 96 µM) and indoleamine 2, 3-dioxygenase (IDO) inhibitor. β-Carboline 1-carboxylic acid is cytotoxic to tumor cells. β-Carboline 1-carboxylic acid inhibits inflammation through the NF-κb/p65 pathway and can reverse epithelial-mesenchymal transition (EMT). In addition, β-Carboline 1-carboxylic acid has strong inhibitory activity against S. aureus (IC50: 47.70 μg/mL) and E. coli (IC50: 19.17 μg/mL).
    β-Carboline-1-carboxylic acid
  • HY-177557
    IDO-IN-19
    		Inhibitor
    IDO-IN-19 (Compound I) is a free base of an imidazole-isoindole derivative. IDO-IN-19 can inhibit the activity of Indoleamine 2,3-Dioxygenase (IDO). IDO-IN-19 can block the decomposition of tryptophan and restore the function of T cells. IDO-IN-19 can be used for the researches of cancer, immunology, infection and neurological disease, such as breast cancer and Alzheimer's disease.
    IDO-IN-19
  • HY-159977
    1,2-Didehydrotanshinone IIA
    		Inhibitor
    1,2-Didehydrotanshinone IIA is a moderate AChE and BChE inhibitor, with an IC50 value of 5.98 μM for BChE. 1,2-Didehydrotanshinone IIA is a IDO inhibitor, with an IC50 value of 4.68 µM μM.
    1,2-Didehydrotanshinone IIA
  • HY-138576
    IDO1-IN-26
    		Inhibitor 98.22%
    IDO1-IN-26 (N-(2-Benzo[1,3]dioxol-5-yl-ethyl)-2-(4-methyl-benzyl)-succinamic acid SA) is a IDO1 inhibitor that can be used for the study of sarcopenia or age-related muscle loss.
    IDO1-IN-26
  • HY-101560R
    Linrodostat (Standard)
    		Inhibitor
    Linrodostat (Standard) is the analytical standard of Linrodostat (HY-101560). This product is intended for research and analytical applications. Linrodostat (BMS-986205) is a selective and irreversible indoleamine 2,3-dioxygenase 1 (IDO1) inhibitor with an IC50 value of 1.1 nM in IDO1-HEK293 cells. Linrodostat is well tolerated with potent pharmacodynamic activity in advanced cancers.
    Linrodostat (Standard)
  • HY-101560A
    Linrodostat mesylate
    		Inhibitor
    Linrodostat (BMS-986205) mesylate is a selective irreversible inhibitor of indoleamine 2,3-dioxygenase 1 (IDO1), which effectively inhibits IDO1-HEK293 mesylate cells with an IC50 value of 1.1 nM. Linrodostat mesylate demonstrates good pharmacological activity in advanced cancer.
    Linrodostat mesylate
  • HY-13555R
    β-Lapachone (Standard)
    β-Lapachone (Standard) is the analytical standard of β-Lapachone. This product is intended for research and analytical applications. β-Lapachone (ARQ-501;NSC-26326) is a naturally occurring O-naphthoquinone, acts as a topoisomerase I inhibitor, and induces apoptosis by inhibiting cell cycle progression.
    β-Lapachone (Standard)
  • HY-16724R
    Indoximod (Standard)
    		Inhibitor
    Indoximod (Standard) is the analytical standard of Indoximod. This product is intended for research and analytical applications. Indoximod (1-Methyl-D-tryptophan) is an orally active indoleamine 2,3-dioxygenase (IDO) pathway inhibitor. Indoximod acts as a Trp mimetic in regulating mTOR. Indoximod is an immunometabolic adjuvant used for the research of cancer.
    Indoximod (Standard)
  • HY-100687R
    GNF-PF-3777 (Standard)
    		Inhibitor
    GNF-PF-3777 (Standard) is the analytical standard of GNF-PF-3777 (HY-100687). This product is intended for research and analytical applications. GNF-PF-3777 (8-Nitrotryptanthrin) is a potent human indoleamine 2,3-dioxygenase 2 (hIDO2) inhibitor which significantly reduces IDO2 activity with Ki of 0.97 μM.
    GNF-PF-3777 (Standard)
  • HY-134920
    LW106
    		Inhibitor
    LW106 is a selective IDO1 inhibitor with an IC50 of 1.57 μM. LW106 has no inhibitory effect on IDO2 and TDO. LW106 inhibits tumor outgrowth by limiting stroma-immune crosstalk and CSC enrichment in the tumor microenvironment. LW106 reduces subpopulation of cancer stem cells (CSCs) in xenografted tumors in which less proliferative/invasive tumor cells and more tumor cells apoptosis. LW106 can be used for the studies of lung cancer and melanoma.
    LW106
  • HY-101111R
    PF-06840003 (Standard)
    		Inhibitor
    PF-06840003 (Standard) is the analytical standard of PF-06840003 (HY-101111). This product is intended for research and analytical applications. PF-06840003 (EOS200271) is a highly selective, orally active and brain-penetrant IDO-1 inhibitor with IC50s of 0.41 μM, 0.59 μM, and 1.5 μM for hIDO-1, dIDO-1, and mIDO-1, respectively.
    PF-06840003 (Standard)
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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