Retinal proteins modified by 4-hydroxynonenal: identification of molecular targets

Experimental Eye Research
Rebecca J KapphahnDeborah A Ferrington

Abstract

The reactive aldehyde, 4-hydroxynonenal (HNE), is a product of lipid peroxidation that can covalently modify and inactivate proteins. Previously, we reported increased HNE modification of select retinal proteins resolved by one-dimensional gel electrophoresis in aged Fisher 344 x Brown Norway rats (Louie, J.L., Kapphahn, R.J., Ferrington, D.A., 2002. Proteasome function and protein oxidation in the aged retina. Exp. Eye Res. 75, 271-284). In the current study, quantitative assessment of HNE molar content using slot blot immunoassays showed HNE content is increased 30% in aged rat retina. In contrast, there was no age-related difference in HNE content in individual spots resolved by 2D gel electrophoresis suggesting the increased modification is likely on membrane proteins that are missing on 2D gels. The HNE-immunoreactive proteins resolved by 2D gel electrophoresis were identified by MALDI-TOF mass spectrometry. These proteins are involved in metabolism, chaperone function, and fatty acid transport. Proteins that were frequently modified and had the highest molar content of HNE included triosephosphate isomerase, alpha enolase, heat shock cognate 70 and betaB2 crystallin. Immunochemical detection of HNE adducts on retinal sect...Continue Reading

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Citations

Jun 5, 2010·Journal of Proteome Research·Ashraf G Madian, Fred E Regnier
Nov 26, 2010·Photochemistry and Photobiology·Daniel OrganisciakPaul Wong
Mar 23, 2011·The British Journal of Ophthalmology·Andreas StahlLois E H Smith
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