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Hydrolases of anterior segment tissues in the normal human, pig and rat eye: a comparative study

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Abstract

The distributions of the hydrolases acid and alkaline phosphatase (AP and ALP), N-acetyl-β-l-glucosaminidase (NAG), β-glucuronidase (β-Gluc), β-galactosidase (β-Gal), non-specific esterase (UE), dipeptidylpeptidases II and IV (DPPII and DPPIV), aminopeptidases M and A (APM and APA), and γ-glutamyltransferase (GGT) were investigated in the human, pig and Lewis rat normal anterior segment by histochemical methods. The distribution of the above hydrolases, particularly that of proteases, varied between ocular tissues and between the three species. Lysosomal hydrolases together with GGT and ALP were consistently active in the corneal epithelium, stroma and endothelium in all three species; the corneal distribution and activity of β-Gal, APM, APA and DPPIV, however, displayed interspecies variation. The angular tissues showed similarities for most hydrolases with the exceptions of β-Gal, UE, APM, APA and DPPIV In all eyes examined strong ciliary epithelial activity for AP, β-Gal, UE, GGT and ALP was observed in the pars plicata; only the pig eye also displayed strong DPPIV activity in this area. Regional differences in hydrolase distribution in the iris were observed in all species. A post-mortem freezing delay of longer than 24 h resulted in a decrease in hydrolase activity.

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Coupland, S.E., Penfold, P.L. & Billson, F.A. Hydrolases of anterior segment tissues in the normal human, pig and rat eye: a comparative study. Graefe's Arch Clin Exp Ophthalmol 232, 182–191 (1994). https://doi.org/10.1007/BF00176789

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  • DOI: https://doi.org/10.1007/BF00176789

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