Differential radiosensitivity of neurons and neuroglia of the hippocampus in the adult rabbit.

Abstract:

:Adult rabbits were subjected to 4.5 Gy of whole-blody or brain alone gamma-irradiation, and their hippocampus was examined with the light and electron microscope. Pycnotic cells were found at the base of the granular layer of the dentate gyrus in the so-called subgranular zone, as soon as 3 h after irradiation, and were cleared up by active phagocytosis after 48 h. Some of these cells appeared as undifferentiated, whereas others were differentiating granule cells, and possibly immature neuroglia. The extent of cell necrosis was contingent upon the age of the animal, the oldest animal studied (27 months) showing only sparse lesion of that type. Astrocytes and microglia were responsible for the phagocytosis of dead cells. Another type of lesion was found in the nuclei of the mature granule cells and consisted of light spots which appeared 1 h after the irradiation and disappeared almost completely after 48 h. Pyramidal cells did not show any of these two lesions. It is concluded that the laterations in the electrical activity of pyrimidal cells, following irradiation, are at least partly due to lesions affecting the dentate gyrus. Radionecrosis in the subgranular zone is related to the presence of immature cells in this region.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Guéneau G,Drouet J,Privat A,Court L

doi

10.1007/BF00690520

subject

Has Abstract

pub_date

1979-12-01 00:00:00

pages

199-209

issue

3

eissn

0001-6322

issn

1432-0533

journal_volume

48

pub_type

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