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Ultrastructural changes in the brain capillaries after hypoxia.

The authors describe ultrastructural changes in and around rat brain capillaries after hypoxia. The experimental animals breathed a mixture of 5% oxygen and 95% nitrogen for two or for three hours; a third group, which spent three hours in this atmosphere, was treated 24 h later. Cytoplasm processes and vesicles were observed on the luminal side in the endothelial cells, while the cytoplasm contained vacuoles and altered mitochondria. The basement membrane of the brain capillaries was uneven and longitudinal clear zones were formed in it. Altered mitochondria were present in the pericytes and astrocytes. The most pronounced changes were found in the astrocyte processes, which were light and hydrated and contained destroyed mitochondria and lamellar bodies resembling myelin. After 24 h, morphological changes still persisted, especially in the astrocyte processes.

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