Proteomic analysis of rat retina in a steroid-induced ocular hypertension model: potential vulnerability to oxidative stress.

Abstract:

PURPOSE:To investigate global protein expression profiles in the retinas of normal and glucocorticoid-induced ocular hypertensive rats by proteomic analysis. METHODS:Ocular hypertension was induced by topical application of dexamethasone (DEX) for 4 weeks. Age-matched untreated rats served as controls. Intraocular pressure (IOP) was monitored by an electronic tonometer. Retinal protein expression profiling was carried out by two-dimensional fluorescence difference gel electrophoresis (2-D DIGE). Proteins were identified by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. RESULTS:In DEX-treated rats, average IOP was elevated significantly compared with controls. With DEX treatment, levels of four proteins were altered, as revealed by 2-D DIGE and MALDI-TOF mass spectrometry: apolipoprotein A1 (apoA1), a lipid-binding protein, upregulated 1.9-fold, P < 0.05; alpha A crystallin (CRYAA), a molecular chaperone, downregulated 2.7-fold, P < 0.01; superoxide dismutase 1 (SOD1), an antioxidant enzyme, downregulated 2.3-fold, P < 0.05; and triosephosphate isomerase 1 (TPI1), a glycolytic enzyme, downregulated 2.3-fold, P < 0.01. CONCLUSIONS:Downregulation of CRYAA, SOD1, and TPI1, observed here after a short period of DEX-induced ocular hypertension, may be involved in the onset of neural damage in steroid-induced glaucoma.

journal_name

Jpn J Ophthalmol

authors

Miyara N,Shinzato M,Yamashiro Y,Iwamatsu A,Kariya KI,Sawaguchi S

doi

10.1007/s10384-007-0507-5

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

84-90

issue

2

eissn

0021-5155

issn

1613-2246

pii

10.1007/s10384-007-0507-5

journal_volume

52

pub_type

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