Oxidized and reduced glutathione levels of the cornea in vivo

Abstract

A new method for preparing the rabbit cornea is described for the assay of metabolite levels in the in vivo state. The preparation includes in vivo rapid freezing of the tissue by liquid nitrogen, freeze sawing, lyophilization, and extraction with 0.5 N perchloric acid. Reduced (GSH) and oxidized (GSSG) glutathione levels and the GSH/GSSG ratios were compared with adenosine phosphate levels and ATP/ADP ratios. The most important results of this investigation seemed to be a significant difference in the redox state of the glutathione between the epithelium and the endothelium of the corea and the different reducing capacity of these tissues as indicated by the steady-state levels of the GSH and the GSSG. These metabolic processes may be used to eliminate toxic peroxides from the transparent ocular tissues produced by light or other chemical compounds.