Proteomics

Dataset Information

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Nitration of Tyrosines In Complement Factor H Domains Alters Its Immunological Activity and Mediates A Pathogenic Role In Age Related Macular Degeneration


ABSTRACT: Nitrosative stress has been implicated in the pathogenesis of age related macular degeneration (AMD). Tyrosine nitration is a unique type of post translational modification that occurs in the setting of inflammation and nitrosative stress. To date, the significance and functional implications of tyrosine nitration of complement factor H (CFH), a key complement regulator in the eye has not been explored, and is examined in this study in the context of AMD pathogenesis. Sections of eyes from deceased individuals with AMD (n = 5) demonstrated the presence of immunoreactive nitrotyrosine CFH. We purified nitrated CFH from retinae from 2 AMD patients. Mass spectrometry of CFH isolated from AMD eyes revealed residues in domains critical for binding to heparan sulphate glycosaminoglycans (GAGs), lipid peroxidation by-products and complement (C) 3b were nitrated. Functional studies revealed that nitrated CFH did not bind to lipid peroxidation products, nor to the GAG of perlecan nor to C3b. There was loss of cofactor activity for Factor I mediated cleavage of C3b with nitrated CFH compared to non-nitrated CFH. CFH inhibits, but nitrated CFH significantly potentiates, the secretion of the pro-inflammatory and angiogenic cytokine IL-8 from monocytes that have been stimulated with lipid peroxidation by-products. AMD patients (n = 30) and controls (n = 30) were used to measure plasma nitrated CFH using a novel ELISA. AMD patients had significantly elevated nitrated CFH levels compared to controls (p = 0.0117). These findings strongly suggest that nitrated CFH contributes to AMD progression, and is a target for therapeutic intervention.

INSTRUMENT(S): LTQ FT

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Eye

DISEASE(S): Macular Degeneration

SUBMITTER: Jason Wong  

LAB HEAD: Steven Krilis

PROVIDER: PXD005613 | Pride | 2017-08-29

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
InVitroNitration_CFH.RAW Raw
InVitroNitration_CFH.mzid.gz Mzid
InVitroNitration_CFH.pride.mztab.gz Mztab
InVivoNitration_CFH_lowband.mzid.gz Mzid
InVivoNitration_CFH_lowband.pride.mztab.gz Mztab
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Publications

Nitration of tyrosines in complement factor H domains alters its immunological activity and mediates a pathogenic role in age related macular degeneration.

Krilis Matthew M   Qi Miao M   Madigan Michele C MC   Wong Jason W H JWH   Abdelatti Mahmoud M   Guymer Robyn H RH   Whitelock John J   McCluskey Peter P   Zhang Peng P   Qi Jian J   Hunyor Alex P AP   Krilis Steven A SA   Giannakopoulos Bill B  

Oncotarget 20170701 30


Nitrosative stress has been implicated in the pathogenesis of age related macular degeneration (AMD). Tyrosine nitration is a unique type of post translational modification that occurs in the setting of inflammation and nitrosative stress. To date, the significance and functional implications of tyrosine nitration of complement factor H (CFH), a key complement regulator in the eye has not been explored, and is examined in this study in the context of AMD pathogenesis.Sections of eyes from deceas  ...[more]

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