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Purpose   To investigate the effect of ocular hypertension-induced isomerization of aspartic acid in retinal proteins.Methods   Adult Wistar rats with ocular hypertension were used as an experimental model. D- β -aspartic acid-containing proteins were isolated by SDS-PAGE and western blot with an anti-D- β -aspartic acid antibody and identified by liquid chromatography-mass spectrometry analysis. The concentration of ATP was measured by ELISA.Results   D- β -aspartic acid was expressed in a protein band at around 44.5 kDa at much higher quantities in the retinas of rats with ocular hypertension than in those of normotensive rats. The 44.5 kDa protein band was mainly composed of  α -enolase, S-arrestin, and ATP synthase subunits  α  and  β , in both the ocular hypertensive and normotensive retinas. Moreover, increasing intraocular pressure was correlated with increasing ATP concentrations in the retinas of rats.Conclusion   Ocular hypertension affected the expression of proteins containing D- β -aspartic acid, including ATP synthase subunits, and up-regulation of ATP in the retinas of rats.

Effect of Ocular Hypertension on D-β-Aspartic Acid-Containing Proteins in the Retinas of Rats