Time- and dose-dependent changes in neuronal activity produced by x radiation in brain slices
A new method of exposing tissues to X rays in a lead Faraday cage has made it possible to examine directly radiation damage is isolated neuronal tissue. Thin slices of hippocampus from brains of euthanized guinea pigs were exposed to 17.4 keV X radiation. Electrophysiological recordings were made before, during and after exposure to doses between 5 and 65 Gy at a dose rate of 1.54 Gy/min. Following exposure to doses of 40 Gy and greater, the synaptic potential was enhanced, reaching a steady level soon after exposure. The ability of the synaptic potential to generate a spike was reduced and damage progressed after termination of the radiation exposure. Recovery was not observed following termination of exposure. These results demonstrated that an isolated neuronal network can show complex changes in electrophysiological properties following moderate doses of ionizing radiation. An investigation of radiation damage directly to neurons in vitro will contribute to the understanding of the underlying mechanisms of radiation-induced nervous system dysfunction.
- Research Organization:
- Armed Forces Radiobiology Research Inst., Bethesda, MD (USA)
- OSTI ID:
- 6163822
- Report Number(s):
- AD-A-227777/0/XAB; AFRRI-SR--90-21
- Country of Publication:
- United States
- Language:
- English
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Ionizing radiation alters neuronal excitability in hippocampal slices of the guinea pig
Ionizing radiation alters neuronal excitability in hippocampal slices of the guinea pig
Related Subjects
Cells
& Tissue Culture
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
DISEASES
DOSE-RESPONSE RELATIONSHIPS
DOSES
ELECTROMAGNETIC RADIATION
ELECTROPHYSIOLOGY
GUINEA PIGS
HIPPOCAMPUS
IONIZING RADIATIONS
MAMMALS
NERVE CELLS
NERVOUS SYSTEM
NERVOUS SYSTEM DISEASES
ORGANS
PHYSIOLOGY
RADIATION DOSES
RADIATION EFFECTS
RADIATIONS
RADIOINDUCTION
RODENTS
SOMATIC CELLS
TIME DEPENDENCE
VERTEBRATES
X RADIATION