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• W2107530732 abstract "Indoleamine 2,3-dioxygenase (IDO) is the first enzyme in the kynurenine pathway. The kynurenines formed in this pathway chemically modify proteins and cause apoptosis in cells. Evidence suggests that kynurenines and their protein modifications are involved in cataract formation, but this has yet to be directly demonstrated. We generated transgenic (Tg) mouse lines that overexpress human IDO in the lens. Homozygous Tg (homTg) lenses had higher IDO immunoreactivity, ∼4.5 times greater IDO mRNA, and ∼8 times higher IDO activity compared to lenses from hemizygous Tg (hemTg) animals. The kynurenine content was threefold higher in homTg than in hemTg but was not detected in wild-type (Wt) lenses. Kynurenine modifications were ∼2.6 times greater in homTg than in hemTg or Wt. HomTg lenses had vacuoles in the epithelium and cortical fiber cells. Kynurenine modifications coincided with apoptosis in the secondary fiber cells of homTg lenses. Caspase-3 and caspase-9 activities were markedly higher in homTg than in hemTg and Wt. The glutathione content was ∼36% lower in homTg compared to hemTg and Wt lenses. HomTg animals also developed bilateral cataracts within 3 months of birth. Together these data demonstrate that IDO-mediated production of kynurenines results in defects in fiber cell differentiation and their apoptosis and suggest that IDO activity is kept low in the lens to prevent deleterious effects by kynurenines." @default.
• W2107530732 created "2016-06-24" @default.
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• W2107530732 date "2009-05-01" @default.
• W2107530732 modified "2023-10-13" @default.
• W2107530732 title "Indoleamine 2,3-dioxygenase overexpression causes kynurenine-modification of proteins, fiber cell apoptosis and cataract formation in the mouse lens" @default.
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• W2107530732 doi "https://doi.org/10.1038/labinvest.2009.22" @default.
• W2107530732 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2722445" @default.
• W2107530732 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19308046" @default.
• W2107530732 hasPublicationYear "2009" @default.
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