The effect of single doses of radiation on mouse spinal cord
1992; Elsevier BV; Volume: 22; Issue: 1 Linguagem: Inglês
10.1016/0360-3016(92)90982-n
ISSN1879-355X
AutoresYeh‐Chi Lo, William H. McBride, H. Rodney Withers,
Tópico(s)Traumatic Brain Injury and Neurovascular Disturbances
ResumoWe have used a mouse model to study spinal cord injury following single doses (12 to 75 Gy) of radiation.The spinal cord (T,,,,-L,,,) of C,Hf/Sed//Kam mice was irradiated and response graded using four levels of neurological change.Findings were: (a) the doses required to paralyze 50% of animals (ED,,) were 19.79, 20.77, and 21.85 Gy for mild, partial, and complete paralysis, respectively, as measured 200-360 days after radiation.(h) Most damage was progressive but it was not necessarily so; after doses up to 28 Gy recovery was occasionally seen.(c) Latency depended on the dose and the level of damage.Following doses around the ED,,, paralysis occurred between 180 to 300 days.(d) There were significant fluctuations in the dose-latency relationship at doses less than 35 Gy.Latency may be not a reliable endpoint to compare biological effects of radiation in this dose range.(e) The radiosensitivity of mouse spinal cord was similar to that reported for rats.(f) Histologically, demyelination was the dominant lesion in the paralyzed animals.We conclude that the mouse is a good animal model to study radiation damage to the spinal cord, at least when a 2.2 cm length is irradiated.Spinal cord injury, Mouse, Paralysis, Volume effect.
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