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Investigative Ophthalmology & Visual Science, Vol 24, 612-618, Copyright © 1983 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Conjunctival goblet cell frequency after alkali injury is not accurately reflected by aqueous tear mucin content

J Friend, T Kiorpes and RA Thoft

Goblet cell counts have been used to evaluate the suitability of conjunctiva as a source of ocular surface epithelial cells. However, since tear mucin content can be determined without tissue excision, it seemed that the concentration of those compounds might be a useful indicator of conjunctival vitality. To test the extent to which aqueous tear composition reflects conjunctival goblet cell frequency, goblet cell frequency and aqueous tear mucin content were measured after alkali injury in rabbits. Mild alkali injury (0.1 N NaOH for 30 sec) caused a transient but substantial decrease in goblet cells (to 25% of normal at day 7) with a return to normal by six weeks. Tear mucin content was decreased to a lesser degree, from a normal value of 6.4 +/- 0.47 nmol oligosaccharide per microliter (n = 10) to a minimal value of 4.7 +/- 0.64 (n = 7) (73% of normal) at day 7, returning to normal 4 weeks after injury. Thus, the direction of the change was the same, but the magnitudes were quite different. These results suggest that conjunctival goblet cell frequency is not accurately reflected by aqueous tear mucin content, and therefore, that tear mucin content cannot be used directly as an indicator of conjunctival health.


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