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The effects of prenatal exposure of female rats to a 900 MHz electromagnetic field on spinal cord morphology and motor activity in young rats should be investigated.
Pregnant rats were either exposed or not exposed (n=3, respectively). When rat pups were 21 days old, female pups from non-exposed mothers were assigned to the control group (n=13) and pups from exposed mothers were assigned to the exposure group (n=10). At the age of 26 days, motor activity tests were conducted and at the age of 32 days, rats were killed and histological examinations were conducted.
神経系への影響: spinal cord morphology and motor activity in young rats
形態学/組織学的変化: spinal cord histology of upper thoracic region (cresyl violet stain, microscopy)
認知的／行動学的影響評価項目: motor activity (number of squares crossed and numbers of rearings (inquisitive investigation of surroundings by rising onto its hind legs), anxiety (number of defecations); open field test), motor coordination and balance (time until fall down; accelerating rotating rod test)
Motor coordination and balance were significantly increased in exposed rats compared to the control group, while motor activity did not show any significant differences between the groups. No pathologic changes were found in spinal cord samples from control rats, while exposed rats showed atrophy, vacuolization in gray matter and occasional myelin thickening, white matter infiltration among the nerve fibers and infiltration of gray matter inside white matter as well as structural impairment in motor neuron cell body structure. The authors conclude that prenatal exposure of female rats to a 900 MHz electromagnetic field might affect spinal cord morphology which might cause a change in motor functions in young rats.