Human indoleamine 2,3-dioxygenase,IDO ELISA Kit

Code CSB-E09966h
Size 96T,5×96T,10×96T
See More Details 24T ELISA kits trial application
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Product Details

Target Name indoleamine 2,3-dioxygenase 1
Alternative Names 3-dioxygenase ELISA Kit; I23O1_HUMAN ELISA Kit; IDO 1 ELISA Kit; IDO ELISA Kit; IDO-1 ELISA Kit; IDO1 ELISA Kit; INDO ELISA Kit; indolamine 2,3 dioxygenase ELISA Kit; Indole 2 3 dioxygenase ELISA Kit; indoleamine 2 3 dioxygenase 1 ELISA Kit; indoleamine 2 3 dioxygenase ELISA Kit; Indoleamine 2,3-dioxygenase 1 ELISA Kit; Indoleamine pyrrole 2 3 dioxygenase ELISA Kit; Indoleamine-pyrrole 2 ELISA Kit
Abbreviation IDO1
Uniprot No. P14902
Species Homo sapiens (Human)
Sample Types serum, plasma, tissue homogenates, cell lysates
Detection Range 0.78 ng/mL-50 ng/mL
Sensitivity 0.195 ng/mL
Assay Time 1-5h
Sample Volume 50-100ul
Detection Wavelength 450 nm
Research Area Metabolism
Assay Principle quantitative
Measurement Sandwich
Intra-assay Precision (Precision within an assay): CV%<8%
Three samples of known concentration were tested twenty times on one plate to assess.
Inter-assay Precision (Precision between assays): CV%<10%
Three samples of known concentration were tested in twenty assays to assess.
To assess the linearity of the assay, samples were spiked with high concentrations of human IDO in various matrices and diluted with the Sample Diluent to produce samples with values within the dynamic range of the assay.
1:1Average %90
Range %85-99
1:2Average %95
Range %91-102
1:4Average %89
Range %84-94
1:8Average %93
Range %89-98
The recovery of human IDO spiked to levels throughout the range of the assay in various matrices was evaluated. Samples were diluted prior to assay as directed in the Sample Preparation section.
Sample TypeAverage % RecoveryRange
Serum (n=5) 9791-104
EDTA plasma (n=4)8680-90
Typical Data
These standard curves are provided for demonstration only. A standard curve should be generated for each set of samples assayed.
502.574 2.552 2.563 2.461
252.078 1.949 2.014 1.912
12.51.228 1.278 1.253 1.151
6.250.537 0.560 0.549 0.447
3.120.326 0.340 0.333 0.231
1.560.204 0.197 0.201 0.099
0.780.159 0.152 0.156 0.054
00.103 0.100 0.102  
and FAQs
Storage Store at 2-8°C. Please refer to protocol.
Lead Time 3-5 working days

Target Data

Function Catalyzes the first and rate limiting step of the catabolism of the essential amino acid tryptophan along the kynurenine pathway
Gene References into Functions
  1. Interference SNHG1 could inhibit the differentiation of Treg cells by promoting miR-448 expression and reducing IDO level, thereby impeding the immune escape of breast cancer . PMID: 29886172
  2. We discuss how small-molecule inhibitors of the tryptophan (Trp) catabolic enzyme indoleamine 2,3-dioxygenase (IDO) represent a vanguard of new immunometabolic adjuvants to safely enhance the efficacy of cancer immunotherapy, radiotherapy, or 'immunogenic' chemotherapy by leveraging responses to tumor neoantigens PMID: 29413421
  3. The role of IDO1-IDO2-AHR pathway in the TLR4-induced tolerogenic phenotype in human dendritic cells has been reported. PMID: 28256612
  4. High coexpression of cytoplasmic IDO1/COX2 was found to be an independent predictor of poor outcome in colorectal cancer patients. PMID: 29853736
  5. Report the crystal structures of IDO1 in complex with its substrate, Trp, an inhibitor, epacadostat, and/or an effector, indole ethanol (IDE). The data reveal structural features of the active site (Sa) critical for substrate activation; in addition, they disclose a new inhibitor-binding mode and a distinct small molecule binding site (Si). PMID: 29167421
  6. IDO decreased glycolysis and glutaminolysis by activating GCN2K, resulting in activation of AMPactivated protein kinase. PMID: 29693118
  7. this review highlights the role of indoleamine-2,3-dioxygenase in normal and pathological pregnancies PMID: 29154462
  8. Data suggest that IDO1 is constitutively expressed in insulin-secreting cells from donors without diabetes; IDO1 appears to be down-regulated in insulin-containing beta-cells from double autoantibody-positive donors and donors with recent-onset type 1 diabetes; this study was conducted on donor tissues obtained from cadavers. PMID: 29945890
  9. Twenty-nine percent (n = 2/7) of the PD-L1 positive poorly differentiated thyroid carcinomas also co-expressed IDO1 PMID: 29372535
  10. In non-ST segment elevation myocardial infarction, the tolerogenic mechanism of the immune response related to IDO production by activated monocytes derived dendritic cells is altered, supporting their role in T-cell dysregulation. PMID: 29278387
  11. These data suggest that the expression of immunosuppressive molecules, including PD-1 ligands and IDO1, by macrophage/microglia may be involved in immune evasion of lymphoma cells. PMID: 29998979
  12. Our data demonstrate that high intratumoral IDO1 mRNA levels correlate with a poor glioblastoma (GBM) patient prognosis. It also confirms the positive correlation between increased GBM IDO1 levels and human-infiltrating T cells PMID: 28751450
  13. Among the 89 patients, CD274, LAG3, and IDO1 expressions in TIICs were observed in 68.6% (61 cases), 13.5% (12), and 28.1% (25) of patients, respectively. CD274, CTLA4, and IDO1 were expressed in tumor cells of 24.7% (22 cases), 4.5% (4), and 72.0% (64) of patients, respectively. PMID: 29520442
  14. Multivariate analysis indicated indoleamine 2,3-dioxygenase (IDO) expression as independent prognostic factors in overall survival (OS). PMID: 29848687
  15. these findings suggest that IDO1 promoter methylation regulates anti-immune responses in breast cancer subtypes and could be used as a predictive biomarker for IDO1 inhibitor-based immunotherapy. PMID: 28264810
  16. main biological and actionable difference between OSCC from NSND and SD lies in the immune microenvironment, suggesting a higher clinical benefit of PD-L1 and IDO1 inhibition in OSCC from NSND PMID: 28460011
  17. An IDO1 inhibitor, epacadostat also demonstrated promising activity in combination with the PD-1 checkpoint inhibitors in other solid tumors, including melanoma, urothelial carcinoma, renal cell carcinoma, and non-small cell lung cancer PMID: 28760910
  18. This first-in-human phase I study investigated the maximum tolerated dose, safety, pharmacokinetics, pharmacodynamics, and antitumor activity of epacadostat (INCB024360), a potent and selective inhibitor of IDO1 PMID: 28053021
  19. Fumaric acid esters inhibit both IDO expression and enzymatic activity leading to a modulation of tryptophan degradation. PMID: 27376248
  20. Our results highlight the role of COX-2 in constitutive IDO1 expression by human tumors and substantiate the use of COX-2 inhibitors to improve the efficacy of cancer immunotherapy, by reducing constitutive IDO1 expression, which contributes to the lack of T-cell infiltration in "cold" tumors, which fail to respond to immunotherapy PMID: 28765120
  21. this data we have identified the structure of two possible compounds that may be even more potent pharmacological repressors of IDO-1. PMID: 28735627
  22. Prognostic value of IDO in acute myeloid leukemia. PMID: 26762931
  23. These findings indicate that IDO1 has the potential to participate in or contribute to the formation of new capillaries, supporting the applicability of IDO1-targeting molecular therapy in lung cancer. PMID: 28498425
  24. induces PD-L1 expression by melanoma cells PMID: 27121174
  25. PD-L1, IDO-1, and B7-H4 are differentially expressed in human lung carcinomas and show limited co-expression. While PD-L1 and IDO-1 are associated with increased tumor-infiltrating lymphoycte and IFN-gamma stimulation, B7-H4 is not. PMID: 27440266
  26. Data show that indole 23-dioxygenase (IDO) is variably expressed by tumor-infiltrating immune cells or reactive cells rather than lymphoma cells in diffuse large-cell lymphoma (DLBCL). PMID: 26727587
  27. High IDO1 expression is associated with hepatocellular carcinoma. PMID: 26895379
  28. Epacadostat significantly decreases Treg proliferation induced by IDO production from IFN-gamma plus LPS matured human DCs, although the Treg phenotype does not change PMID: 27192116
  29. Inhibition of TOR serine-threonine kinases (mTOR) strongly induced indoleamine 23-dioxygenase 1 (IDO1) expression and activity, corroborating its ability to recruit Treg cells in the tumor microenvironment. PMID: 27174915
  30. up-regulation induces immunosuppression and may enhance the risk of hepatitis C virus and hepatitis B virus induced hepatocellular carcinoma [review] PMID: 28428708
  31. MALAT1-overexpressed MSCs promoted M2 macrophage polarization and this effect was mediated by MALAT1-induced IDO expression, suggesting that MALAT1 may enhance the immunosuppressive properties of MSCs in vivo. PMID: 28176360
  32. this study demonstrated that the downregulation of IDO expression on the endothelial cells of the villous stroma was associated with preeclampsia PMID: 28131097
  33. The data suggest that in Puumala infection, the mechanism responsible for the suppressive effect of IDO is not metabolic control of effector cells but rather the signaling mediated by tryptophan breakdown products, such as kynurenine. PMID: 28057727
  34. These results show IDO is upregulated with RSV infection and this upregulation likely participates with IFN-gamma in inhibition of virus replication and suppression of some host cell responses to infection. PMID: 28963880
  35. IDO role in cancer immune responses [review] PMID: 26517538
  36. This study demonstrated that IDO-1 was elevated in the Solid Component and Cyst Fluid of Human Adamantinomatous Craniopharyngioma. PMID: 28859336
  37. The Binding Mode of N-Hydroxyamidines to Indoleamine 2,3-Dioxygenase 1 PMID: 28731684
  38. Fourier transform infrared (FTIR) and nanosecond time-resolved optical spectroscopy to hIDO1 variants with modified heme pocket structures to identify important amino acid residues that stabilize the substrate in the active site. PMID: 28189796
  39. Thus, our study provides novel insights into the interaction between a small molecule inhibitor INCB14943 and IDO1 protein. The structural information will facilitate future IDO1 inhibitor design. PMID: 28412361
  40. The aim of the present study was to clarify the effect of IDO1induced macrophages on the growth of endometrial stromal cells in endometriosis. IDO1 educated-macrophages may facilitate the survival of retrograde endometrial tissues, and be involved in the pathogenesis of endometriosis. PMID: 28260094
  41. Our results identified FGL2, GAL, SEMA4D, SEMA7A, and IDO1 as new candidate genes that could be involved in MSCs-mediated immunomodulation. FGL2, GAL, SEMA4D, SEMA7A, and IDO1 genes appeared to be differentially transcribed in the different MSC populations. Moreover, these genes were not similarly modulated following MSCs-exposure to inflammatory signals PMID: 28336906
  42. IDO mediated conversion of FOXP3 -T cells to Tregs predominantly occurs in children with inflammatory bowel disease. PMID: 28337881
  43. The study confirmed that high IDO expression in pancreatic adenocarcinoma was related to poor prognosis of patients. These findings provided evidence that IDO was involved in pancreatic adenocarcinoma progression and might serve as a relevant therapeutic target. PMID: 28303855
  44. ver-expression of CTLA4 and IDO1 was significantly associated with biochemical recurrence. Our results provide clues on the mechanisms of tumor development and point to potential biomarkers for early detection and treatment for prostate cancer in young men. PMID: 28027300
  45. IDO1 mRNA expression in cervical cancer PMID: 27761872
  46. Structural Study of a Flexible Active Site Loop in Human Indoleamine 2,3-Dioxygenase and Its Functional Implications. PMID: 27112409
  47. IDO gene expression is a feature of aggressive non-muscle-invasive urothelial cell bladder carcinoma, suggesting a potential immunosuppressive role of IDO PMID: 28314306
  48. Data show that in the absence of indoleamine 2,3-dioxygenase (IDO) inhibition, fatty acid oxidation increased along with increased activity of carnitine palmitoyltransferase I (CPT1). PMID: 27667153
  49. High IDO1 expression is associated with cervical cancer. PMID: 27106797
  50. PSG stimulated IDO activity under the conditions of induction of the monocytes by interferon-gamma. PMID: 27595833
  51. expression stronger in tongue hyperplasia than in tongue squamous cell carcinoma PMID: 26982018
  52. These results indicate that the level of IDO expression may be associated with pregnancy-related complications, such as URSA, by affecting trophoblast cell proliferation and migration via the STAT3 signaling pathway. PMID: 26814137
  53. IDO is a potential prognostic biomarker for overall survival of patients with gastric adenocarcinoma after gastrectomy. PMID: 26887337
  54. IDO expressed by placenta cells can down-regulate NKp46 and NKG2D expression and reduce cytotoxicity in NK cells, suggesting an important role for IDO in the maintenance of normal pregnancy PMID: 26782048
  55. Results suggest that IDO expression is implicated in immunosuppression and tumor progression in glioma cells; combining IDO inhibition with standard TMZ treatment could be an encouraging therapeutic strategy for patients with malignant glioma PMID: 26636389
  56. Results suggest Withaferin A (WA) as a valuable small ligand molecule with strong binding affinity toward indoleamine 2,3-dioxygenase (IDO). PMID: 25671592
  57. Our results imply the probability of involvement of IDO in development of tolerance process, and we presume that high IDO activity is associated with nonresponsiveness to food allergens despite allergen sensitization. PMID: 26449488
  58. may play role in unexplained recurrent miscarriage PMID: 26511909
  59. high expression in nasopharyngeal carcinoma patients correlates with lower survival rates PMID: 26608400
  60. IDO, through GCN2 kinase activation, downregulates the levels of TCRcomplex tchain and cMyc, resulting in the suppression of Tcell proliferation and a reduction in the levels of LDHA and GLS2 PMID: 26647830
  61. ISG15 is elevated in viremic HIV-1 patients and is associated with high TRAIL and IDO levels. PMID: 26563749
  62. IDO1 expression and activity in LC seem to be involved in the pathophysiology of EH in AD and could represent a predictive biomarker for patients with risk to develop EH and other viral complications. PMID: 26198597
  63. slows down viral replication during Hepatitis C infection; inhibits CD4-T cells proliferation PMID: 25792183
  64. Indoleamine 2,3-Dioxygenase Is Involved in the Inflammation Response of Corneal Epithelial Cells to Aspergillus fumigatus Infections PMID: 26361229
  65. MT has potentiating effect in TGF-beta1-induced EMT, independently of IDO. This nonimmunological effect of MT should be considered if IDO is the target to avoid immune escape in bladder cancer PMID: 26267811
  66. The data are consistent with a common reaction mechanism for indoleamine 2,3-dioxygenase-catalyzed oxidation of tryptophan and other tryptophan analogues. PMID: 26511316
  67. IDO expression was increased in acute phase multiple sclerosis compared to patients in stable phase. PMID: 26110930
  68. the role of IFN-lambda in IDO regulation was investigated after influenza infection of respiratory epithelial cells. PMID: 25756191
  69. Type I interferons, present in systemic lupus erythematosus sera patients, are able to up-regulate IDO expression, which may lead to decreased serum serotonin levels. PMID: 25897671
  70. human amniotic fluid stem cells exhibited regulatory properties when treated with interferon (IFN)-gamma, including induction of the immunomodulatory enzyme indoleamine 2,3-dioxygenase 1 PMID: 25783564
  71. The expression of IDO mRNA was associated with a poor prognosis of AML. PMID: 25248875
  72. IDO activity was significantly greater in HIV/AIDS patients than in healthy controls. PMID: 26285873
  73. Downregulation of CD4 expression by IDO was significantly attenuated by the addition of tryptophan or IDO inhibitor in the infected C8166 cells. PMID: 23109825
  74. Results show low expression of Bin1, along with high expression of IDO, are predictor for poor prognosis in esophageal squamous cell cancer and thereby could be used to establish new therapeutic strategies. PMID: 25683635
  75. We found a definitive relation between IDO1 induction on acute myeloid leukemia blasts mediated by NK cell-produced IFNgamma and the consequent functional deregulation of NK cells that favors AML immune escape. PMID: 25886742
  76. Defective TLR9-mediated activation of IDO1 induction is associated with an inhibitor-positive status. PMID: 26426076
  77. Overexpression of IDO1 promoted immune modulatory activity, which was partly conveyed by IL-10. PMID: 26142400
  78. RSV can induce the expression and bioactivity of IDO in human moDC, in a virus replication-dependant fashion. We suggest that RSV activation of IDO could be a potential mechanism for the development of allergic diseases. PMID: 25627660
  79. review of indoleamine 2,3-dioxygenase in health and disease [review] PMID: 26186743
  80. IDO and tryptophan derivatives, particularly tranilast, can be tools for the therapy for lymphoid malignancies. PMID: 25572287
  81. Data suggest that the tumor necrosis factor-alpha (TNF-alpha)/ transforming growth factor-beta (TGF-beta)/indoleamine 2,3-dioxygenase (IDO) axis may represent a new mechanism contributing to the development of tolerance in IVIg-treated patients. PMID: 25461397
  82. functional importance of IDO enzymes in human Crohn's disease PMID: 25541686
  83. Human indoleamine 2,3-dioxygenase-2 has substrate specificity and inhibition characteristics distinct from those of indoleamine 2,3-dioxygenase-1 PMID: 24875753
  84. The results suggest that considering IDO and EGFR as two indicators for breast cancer treatment or prognosis analysis provides a potential option of individual treatment for the portion of breast cancer patients with co-expression of IDO and EGFR. PMID: 25081660
  85. Cancer/stroma interplay via cyclooxygenase-2 and indoleamine 2,3-dioxygenase promotes breast cancer progression. PMID: 25060643
  86. elevation of MMP-9 and IDO induced by pancreatic cancer cells mediates NK cell dysfunction. PMID: 25274283
  87. through the activation of IL-33, the increased expression of IDO1 in ectopic endometrial stromal cells contributed to the truncated phagocytic ability of macrophages in endometriosis. PMID: 25031694
  88. Cell-sorting experiments demonstrated that IDO1 expression is found in a subset of CD1a(+)CD14(-)langerin(+) cells, expressing CD103 PMID: 25584868
  89. antimicrobial functions are found to be species- and pathogen-specific PMID: 23940074
  90. indoleamine 2,3-dioxygenase and infiltration of FOXP3+ regulatory T cells may have a role in aggressive characteristics of papillary thyroid microcarcinoma PMID: 24742251
  91. Induction of IDO was mediated by the same TLR7-dependent recognition of B. burgdorferi RNA that contributes to the production of type I IFNs by human DCs. PMID: 25420916
  92. In order to exert their protolerogenic function, fibrocytic myeloid-derived suppressor cells require direct contact with activated T cells, which leads to the production and secretion of IDO. PMID: 25113564
  93. These results demonstrate that IDO2 plays a novel role as a negative regulator of IDO1 by competing for heme-binding with IDO1. PMID: 25394548
  94. Data indicate that the expression intensity of indoleamine 2, 3-dioxygenase (IDO) could modulate macrophage polarization in THP-1 cells. PMID: 25200149
  95. low activity is associated with asthma in Finnish population PMID: 24717869
  96. These data indicate that IDO1 expression by leukemia blasts negatively affects the prognosis of childhood acute myeloid leukemia PMID: 24903009
  97. Data show that the subsets of dendritic cells and memory T cells, and the indoleamine 2,3-dioxygenase (IDO) expression were correlated with each other with the tumor size, depth of invasion, lymph node metastasis, and clinical stage. PMID: 24870595
  98. RelB-p52 dimers were found to directly bind to the IDO promoter, leading to IDO expression in MDSCs PMID: 25063873
  99. Paradoxical upregulation of IDO expression in colon MNCs and ECs may represent a new predictive factor for prognosis in gut AGVHD after human allogeneic hematopoietic stem cell transplantation. PMID: 24732701
  100. IDO was found in association with circulating breast cancer MV, while experimental and in silico gene expression revealed that IDO was mainly expressed in a triple-negative subgroup. PMID: 24687552

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Subcellular Location Cytoplasm, cytosol
Protein Families Indoleamine 2,3-dioxygenase family
Tissue Specificity Expressed in mature dendritic cells located in lymphoid organs (including lymph nodes, spleen, tonsils, Peyers's patches, the gut lamina propria, and the thymic medulla), in some epithelial cells of the female genital tract, as well as in endothelial cell
Database Links

HGNC: 6059

OMIM: 147435

KEGG: hsa:3620

STRING: 9606.ENSP00000430505

UniGene: Hs.840

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