[Correlation between permeabiltiy to albumin and levels of cyclic adenosine monophosphate in the incubated rat mesentery].

Histamine, bradykinin and prostaglandin E1 increase the permeability coefficient of albumin; this effect is mimicked by dibutyryl-cAMP and by theophylline. They also cause a significant rise in the cAMP levels of the incubated tissue. Serotonin has lesser activities on these parameters. Presumably, the first three mediators control the transcellular passage of albumin by increasing the cAMP content of the tissue, serotonin being less effective. These findings on the mesentery seem to have a couterpart in vascular tissue as shown by others using different methods.