PMID: 11335883May 4, 2001Paper

Focal ischemia in the cerebral cortex has an effect on the neurohypophysis. I. Ultrastructural changes in capillary vessels of the neurohypophysis after focal ischemia of the cerebral cortex

Neuro Endocrinology Letters
Malgorzata Frontczak-Baniewicz

Abstract

In our investigations we have reported that photochemical reaction leading to brain ischemia can also be precipitated with visible light from a non-coherent light source. It was revealed that focal cerebral ischemia after photochemical reaction cause the alterations in the capillaries ultrastructure and perivascular spaces of the barrier-competent regions of the brain. The purpose of this study is to first characterize the ultrastructural morphological consequences of photochemically induced ischemia in the cerebral cortex on the capillaries of neurohypophysis as the barrier-free region of the brain. We used a model of ischemic brain damage due to obliteration of microvessels following the photochemical reaction. Rats were treated with an intravenous injection of rose bengal and irradiated from a halogen lamp source through an intact cranium to precipitate microvascular damage. Material for electron microscopic studies were sampled from the neurohypophysis 1 and 4 days after irradiation (4 animals in each group) in experimental group and 1 and 4 days after a rose bengal injection in control group. Investigations in transmission electron microscopy revealed platelet aggregation on the endothelium preceded by its early ultrastruc...Continue Reading

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