Contralateral response of macrophages and astrocytes to injury in the cerebral hemisphere of 6-day-old rat following prenatal gamma irradiation.
Wistar pregnant rats were exposed to a single 1.0 Gy dose of gamma rays on gestational days 13, 15, 17 or 19 (E13, E15, E17 and E19, respectively). When offsprings of the irradiated females became 6-day-old, they received a mechanical injury of the cerebral hemisphere. One or 2 days after the injury, [3H]thymidine was injected and the animals were perfused. Brain sections were processed for BSI-B4 isolectin histochemistry or immunohistochemistry for glial fibrillary acidic protein (GFAP) or S-100-beta protein and subjected to autoradiography to visualise proliferating and non-proliferating macrophages or proliferating astrocytes. Significant changes in the contralateral response to injury related to the day of prenatal irradiation could be detected. The response was minimal following irradiations performed on E15 and E17. At those stages of prenatal development, the majority of cortical neurons with interhemispheric connections were formed. Therefore, irradiation-induced reduction of the neurons might minimise transfer of pathogenic stimuli to contralateral areas via degenerating nerve fibers. Consequently, the degree at which the contralateral glial response reflected reactive changes at the lesion site might also be minimal. Results of the present study do not show in detail mechanisms underlying the differences in the contralateral reactivity to injury. They, however, might be of importance to histopathological investigations using animal models of cerebral dysplasia.
Setkowicz
Zuzanna
Z
Department of Neuroanatomy, Institute of Zoology, Jagiellonian University, 6 Ingardena Street, 30 060 Kraków, Poland.
Bień
Ewa
E
Janeczko
Krzysztof
K
D000375:Aging / Q000528:radiation effects; D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000502:physiology / Q000528:radiation effects*; D001345:Autoradiography; D001930:Brain Injuries / Q000378:metabolism / Q000473:pathology*; D002455:Cell Division / Q000528:radiation effects; D002540:Cerebral Cortex / Q000166:cytology* / Q000528:radiation effects; D005260:Female; D007839:Functional Laterality / Q000528:radiation effects; D005720:Gamma Rays / Q000009:adverse effects*; D005865:Gestational Age; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D007150:Immunohistochemistry / Q000379:methods; D008264:Macrophages / Q000502:physiology / Q000528:radiation effects*; D008297:Male; D009414:Nerve Growth Factors / Q000378:metabolism; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D051381:Rats; D017208:Rats, Wistar; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins / Q000378:metabolism
D005904:Glial Fibrillary Acidic Protein; D009414:Nerve Growth Factors; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins