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J Appl Physiol 64: 2348-2356, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 6 2348-2356, Copyright © 1988 by American Physiological Society

ARTICLES

Assessment of tight junctions between pulmonary epithelial and endothelial cells

D. C. Walker, A. L. MacKenzie, B. R. Wiggs, J. G. Montaner and J. C. Hogg
Pulmonary Research Laboratory, St. Paul's Hospital, Vancouver, British Columbia, Canada.

This study is intended to determine whether qualitative assessment of tight junction integrity from freeze-fracture data is reliable. We used lung parenchyma from a control mongrel dog's cardiac lung lobe, from a mongrel dog subjected to vascular high-pressure pulmonary edema (HPPE), and from a dog subjected to oleic acid-induced low-pressure pulmonary edema (LPPE) (6). Quantitative assessment was done on 115 freeze-fracture micrographs of epithelial tight junctions and on another 158 freeze-fracture micrographs of endothelial junctions from the 3 dogs. Quantitative assessment showed differences between the dogs in junction depth, fibril numbers, density, and complexity. for qualitative assessment, these same 273 micrographs were assessed in a single-blind fashion by having six investigators sort first the epithelial and then the endothelial junctions into normal or damaged categories. Qualitative assessment did not agree with quantitative data, suggesting that it is unreliable.


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