Abstract
Edema develops in the tissues of the air-blood barrier of the right lung in rats 24 h after left-sided pneumonectomy. Electron-microscopic histochemical investigations (using ruthenium red — RR) showed that the layer of acid muscopolysaccharides of the supraplasmalemmal covering of the alveolar cells and endothelium is thickened, electron-dense masses of reaction products with RR accumulate on the surface of the respiratory alveolocytes and endothelium, and “vesicles,” covered with reaction product with RR and connected with the plasmalemma of the alveolar and endothelial cells, appear. These findings point to a role of the acid muscopolysaccharides of the surfactant system of the lungs in the accumulation and elimination of fluid from the edematous tissues of the air-blood barrier.
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