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Coinduction of nitric oxide synthase and arginine metabolic enzymes in endotoxin-induced uveitis rats.

Authors: Koga, T  Koshiyama, Y  Gotoh, T  Yonemura, N  Hirata, A  Tanihara, H  Negi, A  Mori, M 
Citation: Koga T, etal., Exp Eye Res 2002 Dec;75(6):659-67.
Pubmed: (View Article at PubMed) PMID:12470967

The regulation of expression of the arginine-recycling enzymes and arginase isoforms in association with inducible nitric oxide synthase (iNOS) in the eye of endotoxin-induced uveitis (EIU) rats is investigated. An animal model of EIU was created in Wistar rats by intravitreal injection of lipopolysaccharide (LPS). mRNAs for argininosuccinate synthase (AS) and arginase I as well as for iNOS, measured by semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR), were induced in the eye of EIU rats. iNOS mRNA increased markedly 3 hr after injection, reached a maximum at 6-12 hr, and then decreased at 24 hr. AS mRNA remained little change at 3 hr and increased maximally at 6 hr (by about 3.3-fold), whereas arginase I mRNA increased later and reached a maximum at 12 hr (by about 4.2-fold). iNOS, AS, and arginase I proteins were also induced. AL and arginase II mRNAs remained little changed. In immunohistochemical analysis, iNOS, AS and arginase I were almost colocalized in infiltrated inflammatory cells in the vitreous, iris, ciliary body and inner layers of the retina. In conclusion, AS and arginase I are coinduced with iNOS in infiltrated inflammatory cells in the eyes of EIU rats, and may regulate NO production by changing intracellular concentration of arginine.

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CRRD Object Information
CRRD ID: 631755
Created: 2003-08-19
Species: All species
Last Modified: 2003-08-19
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.