Human aqueous humor phosphatase activity in cataract and glaucoma

Galina Latarya, Ahmad Mansour, Irena Epstein, Daniel Cotlear, Joseph Pikkel, Shmuel Levartovsky, Michael Yulish, Elie Beit-Yannai

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


PURPOSE. To investigate the presence and activity of protein phosphatase-2A (PPase2A), protein phosphatase-2C (PPase2C), and protein tyrosine phosphatases (PTPs) in the human aqueous humor (AH) of patients with primary open-angle glaucoma (POAG) and cataract and to study the correlation between these phosphatases and the redox state of the AH. METHODS. Eighty-six cataract patients and 29 POAG patients who were scheduled for cataract surgery with or without glaucoma surgery were enrolled in the study. PPase2A, PPase2C, and PTPs levels in AH were measured by enzymelinked immunosorbent assays, Western blot analyses, and spectral methods. The redox state was measured by spectral and fluorescent methods. RESULTS. Phosphatase activity-positive results were significantly higher in AH samples from the POAG group (PP2A χ 2(1) = 11.754, P < 0.01; PP2C χ 2(1) = 8.754, P < 0.01; PTP χ 2(1) = 11.073, P < 0.01). Western blot analysis revealed higher PP2C levels in the AH of glaucoma patients compared with PP2C levels in the AH of cataract patients (P = 0.012). Both oxidized/reduced glutathione ratios and superoxide dismutase levels in the AH were significantly higher in the glaucoma group than in the cataract group. Finally significant correlations were found between PP2A and PP2C, PP2A and PTP, and total antioxidant activity and PTP levels. CONCLUSIONS. There is a statistically significant difference between phosphatase levels in the AH of POAG patients and cataract patients. The phosphatase content of the AH represents tissue pathology, but their presence in the AH may be attributed to cell debris or to active signaling to other molecular events.

Original languageEnglish
Pages (from-to)1679-1684
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Issue number3
StatePublished - 26 Mar 2012
Externally publishedYes


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