Abstract
Although well known as manifestations of sorrow, emotions, frustration, and blackmail, tears have a more prosaic and important function as a lubricant and as a blood substitute for the cornea. Tears transport oxygen and carbon dioxide and play a central role in the cellular economy of the ocular surface and conjunctiva. In addition to proteins, tears contain lipids and glycoproteins, which increase the wetting effect of the aqueous component and delay evaporation. The total protein concentration of tears is about 10% of that of the plasma. About 80 proteins and polypeptide components have been detected by electrophoresis. Among 30 proteins identified in tears, about 50% are enzymes. Some of the tear enzymes are secreted by the lacrimal glands; others are produced by or released from epithelial cells of the cornea and the conjunctiva. Finally, a few enzymes originate from plasma and appear in tears only in cases with increased permeability of the conjunctival vessels. The aim of this review is to provide clinical and biochemical information about tear enzymes both for ophthalmologists and for biochemists interested in clinical and experimental tear enzymology.
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Abbreviations
- CK:
-
creatine kinase
- HSV:
-
herpes simplex virus
- LDH:
-
lactate dehydrogenase
- MDH:
-
malate dehydrogenase
- PA:
-
plasminogen activator
- PAI:
-
plasminogen activator inhibitor
- PK:
-
pyruvate kinase
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Published in Russian in Biokhimiya, 2008, Vol. 73, No. 4, pp. 469–482.
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Sariri, R., Ghafoori, H. Tear proteins in health, disease, and contact lens wear. Biochemistry Moscow 73, 381–392 (2008). https://doi.org/10.1134/S0006297908040020
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DOI: https://doi.org/10.1134/S0006297908040020