Experimental Physiology
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Quarterly Journal of Experimental Physiology 73.1 pp 123-125
© The Physiological Society 1988
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THE ULTRASTRUCTURE OF FROG MICROVESSELS FOLLOWING PERFUSION WITH THE IONOPHORE A23187

Geraldine Clough 1 and C. C. Michel 1

1 Department of Physiology and Biophysics, St Mary's Hospital Medical School, London W2 1PG

The ultrastructure of frog mesenteric capillaries and venules has been examined after the permeability of these vessels to fluid and macromolecules has been increased to a measured extent by perfusion with the ionophore A23187. An average 4·5-fold increase in hydraulic permeability in thirteen vessels was associated with the presence of gaps between the endothelial cells and marked attenuation of endothelial cytoplasm with the appearance of many fenestrations. The changes in ultrastructure suggested much larger increments in permeability than had been measured in these same vessels in vivo.

Submitted on September 21, 1987
Accepted on October 6, 1987






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Copyright © 1988 by the The Physiological Society.