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== Inhibitors ==
== Inhibitors ==
[[Norharmane]], via inhibition of indoleamine 2,3-dioxygenase exerts neuroprotective properties by suppressing [[kynurenine]] neurotoxic metabolites such as [[quinolinic acid]], 3-hydroxy-kynurenine and [[nitric oxide synthase]].<ref name="pmid10947071">{{cite journal | author = Chiarugi A, Dello Sbarba P, Paccagnini A, Donnini S, Filippi S, Moroni F | title = Combined inhibition of indoleamine 2,3-dioxygenase and nitric oxide synthase modulates neurotoxin release by interferon-gamma-activated macrophages | journal = J. Leukoc. Biol. | volume = 68 | issue = 2 | pages = 260–6 |date=August 2000 | pmid = 10947071 | doi = | url = http://www.jleukbio.org/content/68/2/260.long }}</ref> [[Rosmarinic acid]] inhibits the expression of indoleamine 2,3-dioxygenase via its [[cyclooxygenase]]-inhibiting properties.<ref name="pmid17229401">{{cite journal | author = Lee HJ, Jeong YI, Lee TH, ''et al.'' | title = Rosmarinic acid inhibits indoleamine 2,3-dioxygenase expression in murine dendritic cells | journal = Biochem. Pharmacol. | volume = 73 | issue = 9 | pages = 1412–21 |date=May 2007 | pmid = 17229401 | doi = 10.1016/j.bcp.2006.12.018 }}</ref> [[COX-2 inhibitors]] down-regulate indoleamine 2,3-dioxygenase, leading to a reduction in [[kynurenine]] levels as well as reducing proinflammatory cytokine activity.<ref name="pmid21517752">{{cite journal |author=Cesario A, Rocca B, Rutella S |title=The interplay between indoleamine 2,3-dioxygenase 1 (IDO1) and cyclooxygenase (COX)-2 in chronic inflammation and cancer |journal=Curr. Med. Chem. |volume=18 |issue=15 |pages=2263–71 |year=2011 |pmid=21517752 |doi=10.2174/092986711795656063}}</ref>
[[Norharmane]], via inhibition of indoleamine 2,3-dioxygenase exerts neuroprotective properties by suppressing [[kynurenine]] neurotoxic metabolites such as [[quinolinic acid]], 3-hydroxy-kynurenine and [[nitric oxide synthase]].<ref name="pmid10947071">{{cite journal | author = Chiarugi A, Dello Sbarba P, Paccagnini A, Donnini S, Filippi S, Moroni F | title = Combined inhibition of indoleamine 2,3-dioxygenase and nitric oxide synthase modulates neurotoxin release by interferon-gamma-activated macrophages | journal = J. Leukoc. Biol. | volume = 68 | issue = 2 | pages = 260–6 |date=August 2000 | pmid = 10947071 | doi = | url = http://www.jleukbio.org/content/68/2/260.long }}</ref> [[Rosmarinic acid]] inhibits the expression of indoleamine 2,3-dioxygenase via its [[cyclooxygenase]]-inhibiting properties.<ref name="pmid17229401">{{cite journal | author = Lee HJ, Jeong YI, Lee TH, ''et al.'' | title = Rosmarinic acid inhibits indoleamine 2,3-dioxygenase expression in murine dendritic cells | journal = Biochem. Pharmacol. | volume = 73 | issue = 9 | pages = 1412–21 |date=May 2007 | pmid = 17229401 | doi = 10.1016/j.bcp.2006.12.018 }}</ref> [[COX-2 inhibitors]] down-regulate indoleamine 2,3-dioxygenase, leading to a reduction in [[kynurenine]] levels as well as reducing proinflammatory cytokine activity.<ref name="pmid21517752">{{cite journal |author=Cesario A, Rocca B, Rutella S |title=The interplay between indoleamine 2,3-dioxygenase 1 (IDO1) and cyclooxygenase (COX)-2 in chronic inflammation and cancer |journal=Curr. Med. Chem. |volume=18 |issue=15 |pages=2263–71 |year=2011 |pmid=21517752 |doi=10.2174/092986711795656063}}</ref> Alpha-Methyl-Tryptophan also inhibits indoleamine dioxygenase.<ref>http://cancerres.aacrjournals.org/content/67/2/792.abstract</ref>


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Revision as of 01:55, 8 August 2014

Template:PBB Indoleamine-pyrrole 2,3-dioxygenase (IDO or INDO EC 1.13.11.52) is an enzyme that in humans is encoded by the IDO1 gene.[1][2] This enzyme catalyzes the degradation of the essential amino acid L-tryptophan to N-formylkynurenine.[3]

Function

Indoleamine 2,3-dioxygenase is the first and rate-limiting enzyme of tryptophan catabolism through kynurenine pathway, thus causing depletion of tryptophan which can cause halted growth of microbes as well as T cells.

IDO is an immunomodulatory enzyme produced by some alternatively activated macrophages and other immunoregulatory cells (also used as an immune subversion strategy by many tumors). Interferon-gamma has an antiproliferative effect on many tumor cells and inhibits intracellular pathogens such as Toxoplasma and chlamydia, at least partly because of the induction of indoleamine 2,3-dioxygenase.

It has been shown that IDO permits tumor cells to escape the immune system by depletion of L-Trp in the microenvironment of cells. Indeed, wide range of human cancers such as prostatic, colorectal, pancreatic, cervical, gastric, ovarian, head, lung, etc. overexpress human IDO (hIDO).[4]

Inhibitors

Norharmane, via inhibition of indoleamine 2,3-dioxygenase exerts neuroprotective properties by suppressing kynurenine neurotoxic metabolites such as quinolinic acid, 3-hydroxy-kynurenine and nitric oxide synthase.[5] Rosmarinic acid inhibits the expression of indoleamine 2,3-dioxygenase via its cyclooxygenase-inhibiting properties.[6] COX-2 inhibitors down-regulate indoleamine 2,3-dioxygenase, leading to a reduction in kynurenine levels as well as reducing proinflammatory cytokine activity.[7] Alpha-Methyl-Tryptophan also inhibits indoleamine dioxygenase.[8]

Indoleamine 2,3-dioxygenase
crystal structure of 4-phenylimidazole bound form of human indoleamine 2,3-dioxygenase
Identifiers
SymbolIDO
PfamPF01231
Pfam clanCL0380
InterProIPR000898
PROSITEPDOC00684
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
Indoleamine 2,3-dioxygenase
Identifiers
EC no.1.13.11.52
CAS no.9014-51-1
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO
Search
PMCarticles
PubMedarticles
NCBIproteins

See also

1-Methyltryptophan

Tryptophan 2,3-dioxygenase

References

  1. ^ Dai W, Gupta SL (April 1990). "Molecular cloning, sequencing and expression of human interferon-gamma-inducible indoleamine 2,3-dioxygenase cDNA". Biochem. Biophys. Res. Commun. 168 (1): 1–8. doi:10.1016/0006-291X(90)91666-G. PMID 2109605.
  2. ^ Najfeld V, Menninger J, Muhleman D, Comings DE, Gupta SL (1993). "Localization of indoleamine 2,3-dioxygenase gene (INDO) to chromosome 8p12-->p11 by fluorescent in situ hybridization". Cytogenet. Cell Genet. 64 (3–4): 231–2. doi:10.1159/000133584. PMID 8404046.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ "Entrez Gene: INDO indoleamine-pyrrole 2,3 dioxygenase".
  4. ^ Uyttenhove,C.; Pilotte, L.; Théate, I.; Stroobant, V.; Colau, D.; Parmentier,N.; Boon, T.; Van den Eynde, B. J. Naturemedicine 2003,9, 1269-74
  5. ^ Chiarugi A, Dello Sbarba P, Paccagnini A, Donnini S, Filippi S, Moroni F (August 2000). "Combined inhibition of indoleamine 2,3-dioxygenase and nitric oxide synthase modulates neurotoxin release by interferon-gamma-activated macrophages". J. Leukoc. Biol. 68 (2): 260–6. PMID 10947071.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ^ Lee HJ, Jeong YI, Lee TH; et al. (May 2007). "Rosmarinic acid inhibits indoleamine 2,3-dioxygenase expression in murine dendritic cells". Biochem. Pharmacol. 73 (9): 1412–21. doi:10.1016/j.bcp.2006.12.018. PMID 17229401. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  7. ^ Cesario A, Rocca B, Rutella S (2011). "The interplay between indoleamine 2,3-dioxygenase 1 (IDO1) and cyclooxygenase (COX)-2 in chronic inflammation and cancer". Curr. Med. Chem. 18 (15): 2263–71. doi:10.2174/092986711795656063. PMID 21517752.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. ^ http://cancerres.aacrjournals.org/content/67/2/792.abstract

Further reading

External links