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    Pathway Description
      Metabolism and Physiological Effects of Indole Acetic Acid
Homo sapiens
            Metabolic Pathway
            
          Created: 2021-03-17
          Last Updated: 2023-10-25
        
          Indole acetic acid is an indole compound that is formed through gut microbial metabolism from dietary tryptophan through the indole-3-acetamide pathway . After being transported into gut microbes, tryptophan undergoes a reaction with the enzymes tryptophan monooxygenase and indole-3-acetamide hydrolase to form indole acetic acid. Indole acetic acid that is produced from the gut microbes then enters systemic circulation. This compound is shown to be a uremic toxin through high levels of retention. Indole acetic acid is shown to cause inflammation and disrupt the electron transport chain and oxidative phosphorylation causing muscle atrophy. 
        
      References
      
      Metabolism and Physiological Effects of Indole Acetic Acid References
Gryp, T., De Paepe, K., Vanholder, R., Kerckhof, F. M., Van Biesen, W., Van de Wiele, T., ... & Glorieux, G. (2020). Gut microbiota generation of protein-bound uremic toxins and related metabolites is not altered at different stages of chronic kidney disease. Kidney international, 97(6), 1230-1242.
              Zelante, T., Iannitti, R. G., Cunha, C., De Luca, A., Giovannini, G., Pieraccini, G., ... & Romani, L. (2013). Tryptophan catabolites from microbiota engage aryl hydrocarbon receptor and balance mucosal reactivity via interleukin-22. Immunity, 39(2), 372-385.
              Tsavkelova, E., Oeser, B., Oren-Young, L., Israeli, M., Sasson, Y., Tudzynski, B., & Sharon, A. (2012). Identification and functional characterization of indole-3-acetamide-mediated IAA biosynthesis in plant-associated Fusarium species. Fungal Genetics and Biology, 49(1), 48-57.
              Asai, H., Hirata, J., & Watanabe-Akanuma, M. (2018). Indoxyl glucuronide, a protein-bound uremic toxin, inhibits hypoxia-inducible factor‒dependent erythropoietin expression through activation of aryl hydrocarbon receptor. Biochemical and biophysical research communications, 504(2), 538-544.
              Graboski, A. L., & Redinbo, M. R. (2020). Gut-derived protein-bound uremic toxins. Toxins, 12(9), 590.
              Lim, Y. J., Sidor, N. A., Tonial, N. C., Che, A., & Urquhart, B. L. (2021). Uremic Toxins in the Progression of Chronic Kidney Disease and Cardiovascular Disease: Mechanisms and Therapeutic Targets. Toxins, 13(2), 142.
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              Myles-Worsley M, Tiobech J, Browning SR, Korn J, Goodman S, Gentile K, Melhem N, Byerley W, Faraone SV, Middleton FA: Deletion at the SLC1A1 glutamate transporter gene co-segregates with schizophrenia and bipolar schizoaffective disorder in a 5-generation family. Am J Med Genet B Neuropsychiatr Genet. 2013 Mar;162B(2):87-95. doi: 10.1002/ajmg.b.32125. Epub 2013 Jan 22.
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                  Pubmed: 21123949
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              Nagase T, Seki N, Ishikawa K, Ohira M, Kawarabayasi Y, Ohara O, Tanaka A, Kotani H, Miyajima N, Nomura N: Prediction of the coding sequences of unidentified human genes. VI. The coding sequences of 80 new genes (KIAA0201-KIAA0280) deduced by analysis of cDNA clones from cell line KG-1 and brain. DNA Res. 1996 Oct 31;3(5):321-9, 341-54. doi: 10.1093/dnares/3.5.321.
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              Bechtel S, Rosenfelder H, Duda A, Schmidt CP, Ernst U, Wellenreuther R, Mehrle A, Schuster C, Bahr A, Blocker H, Heubner D, Hoerlein A, Michel G, Wedler H, Kohrer K, Ottenwalder B, Poustka A, Wiemann S, Schupp I: The full-ORF clone resource of the German cDNA Consortium. BMC Genomics. 2007 Oct 31;8:399. doi: 10.1186/1471-2164-8-399.
                  Pubmed: 17974005
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