Abstract
The proteins in human tear fluid form a very complex mixture and can be divided into six main groups: 1) protective proteins: the immunoglobulins (sIgA, IgA, IgG, IgM, IgE; 2) proteins with bacteriostatic or bacteriolytic properties (lactoferrin, tear-specific prealbumin, lysozyme); 3) proteins derived from the plasma (IgA, IgG, albumin, transferrin); 4) glycoproteins as protease inhibitor (acid α1-glycoprotein, α1-antitrypsin, α1-antichymotrypsin); 5) other functional proteins (ceruloplasmin, α2-macroglobulin, ß2-microglobulin); 6) enzymes (amylase, peroxydase, plasminogen activator, plasmin, tryptase and LDH derived from conjunctiva). The composition of tear fluid proteins, their concentration and molecular weights, are summarized in Table 1. The main proteins in human tear fluid, synthesized in the lacrimal gland and at high concentrations present in tear fluid are: 1) secretory immunoglobulin A (sIgA), 2) lactoferrin (LF), 3) tear-specific pre-albumin (TSPA) and 4) lysozyme (LYS). Concentrations are given in Table 1.
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Breipohl, W., Reitz, C., Ahrend, M.H.J., Grus, F.H., Bours, J. (1995). Characterization of Human Tear Glycoproteins by Phast SDS Electrophoresis, Western Blotting and Lectin Binding. In: Weisse, I., Hockwin, O., Green, K., Tripathi, R.C. (eds) Ocular Toxicology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1887-7_37
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