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• W2077527729 abstract "3-Nitrotyrosine is a useful marker for nitric oxide-mediated tissue injury. However, which proteins are preferred peroxynitrite modification targets is unclear. Chondroitin sulfate proteoglycans (CSPGs) abnormally accumulate in cerebrospinal fluid of human neonates with hydrocephalus and may be a target for peroxynitrite modification. We examined (1) whether CSPG core protein can be modified by peroxynitrite in vitro; (2) to what degree in comparison to bovine serum albumin (BSA), the most commonly used nitrated protein standard; (3) whether nitrated CSPGs can be measured directly in biological samples; and (4) whether nitrated proteoglycan concentrations in cerebrospinal fluid correlate with disease. In vitro nitration of bovine aggrecan was performed by exposure to different peroxynitrite concentrations, and 3-nitrotyrosine products were measured. Bovine serum albumin (BSA) nitration was also performed in comparison. A larger percentage of tyrosine residues were nitrated in aggrecan than in BSA under all conditions tested. An enzyme-linked immunosorbent assay (ELISA) for 3-nitrotyrosine consistently overestimated aggrecan nitration when nitrated BSA was used as the standard. This is important as most current assays of nitration in biological samples use nitrated BSA as the standard. Therefore, if nitrated CPSGs were a substantial portion of the nitrated proteins in a sample, total nitrated protein content would be overestimated. Aggrecan retained its function of binding hyaluronic acid despite substantial nitration. A double-sandwich ELISA was developed for nitrated CSPGs in biological samples, using nitrated aggrecan as standard. [Nitrated CSPG] was found to be significantly elevated in preterm hydrocephalus cerebrospinal fluid (P<0.02), but correlated poorly with cerebrospinal fluid [nitric oxide] (P>0.069), suggesting that nitrated CSPG and NO levels may be independant markers of tissue injury. Peroxynitrite-mediated protein tyrosine nitration is a previously unrecognized modification of CSPGs, and may reflect level of brain injury in hydrocephalus." @default.
• W2077527729 created "2016-06-24" @default.
• W2077527729 creator A5006409586 @default.
• W2077527729 date "2004-02-01" @default.
• W2077527729 modified "2023-09-23" @default.
• W2077527729 title "Use of a novel double-sandwich enzyme-linked immunosorbent assay method for assaying chondroitin sulfate proteoglycans that bear 3-nitrotyrosine core protein modifications, a previously unrecognized proteoglycan modification in hydrocephalus" @default.
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• W2077527729 doi "https://doi.org/10.1016/j.ab.2003.10.004" @default.
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