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Assessment of goblet cell size and density in relation to epithelial cell (multi)layering on conjunctival impression cytology samples

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Abstract

Purpose

To assess goblet cell size and numbers in relation to the extent of multilayering of conjunctival impression cytology (CIC) samples as a basis for reducing variability in image selection for goblet cell density (GCD) estimates.

Methods

CIC was undertaken immediately postmortem off the superior bulbar conjunctiva of healthy young adult rabbits onto Millicell-CM Biopore filter units. After fixation with buffered glutaraldehyde and Giemsa staining, two × 200 images were selected from each sample representative of either slight multilayering or substantial multilayering, projected at × 1000, an overlay of the outlines of the goblet cells was made, and their dimensions and areas were measured.

Results

From measures of 4918 goblet cells, the average value (+/− SD) for the longest dimension was 17.7 ± 6.4 μm and 14.6 ± 5.3 μm for the shortest dimension. The GCD values ranged from 210 to 2069/mm2, with a mean of 1074 ± 601/mm2, but was lower for slightly multilayered images (at 537 ± 239 cells/mm ) compared with multilayered regions (at 1612 ± 601 cells/mm2; p < 0.001). The measured areas ranged from 72 to 491 μm2, with average values from any particular image ranging from 110 to 370 μm2, which were inversely correlated with the estimated GCD (Spearman’s rho = − 0.722, p < 0.05).

Conclusions

Larger goblet cells but in fewer numbers were predictably found across the filter surface where there were fewer layers of cells and vice versa. This difference could be considered in selection of images for counts of goblet cells from CIC specimens.

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Funding

This research was funded in part by a grant from the National Sciences and Engineering Research Council (NSERC, grant number A2579).

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Correspondence to Michael J. Doughty.

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The author declares no conflict of interest.

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For these studies, all applicable international, national and institutional guidelines for the care and use of animals were followed. All procedures performed were in accord with the ethical standards of the University of Waterloo, Canada, specifically as formally assessed by the Animal Care Committee at that institution.

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Doughty, M.J. Assessment of goblet cell size and density in relation to epithelial cell (multi)layering on conjunctival impression cytology samples. Graefes Arch Clin Exp Ophthalmol 258, 1727–1734 (2020). https://doi.org/10.1007/s00417-020-04725-5

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  • DOI: https://doi.org/10.1007/s00417-020-04725-5

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