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Journal of Applied Physiology, Vol 62, Issue 3 1076-1083, Copyright © 1987 by American Physiological Society
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J. A. Cooper, P. J. Del Vecchio, F. L. Minnear, K. E. Burhop, W. M. Selig, J. G. Garcia and A. B. Malik
We have developed an experimental system to measure the permeability of the cultured endothelial monolayer. The luminal-to-abluminal flux of 125I-albumin across cultured pulmonary endothelium was expressed as a clearance rate equal to the permeability-surface area product. After clearance rate measurement for a 30-min base-line period, a test agent was added to the luminal side, and the clearance rate was remeasured during a 30-min experimental period. In control studies the base-line clearance rate was 0.343 +/- 0.017 microliter/min. After correction for the diffusional resistances of the filter and unstirred layers, the calculated permeability of the endothelial monolayer was 1.2 X 10(-5) cm/s. When culture medium was the test agent, the experimental clearance rate was unchanged from the base-line value. After addition of 4 mM oleic acid to the luminal chamber, the clearance rate was 0.528 +/- 0.017 microliter/min compared with a base-line value of 0.330 +/- 0.008 microliter/min (P less than 0.005). This method allows the calculation of endothelial permeability with correction for unstirred layers and the use of each monolayer as its own control.
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