Reactions of S-100-positive glia after injury of mouse cerebral cortex.
Reactions of glial cells after stab wounding of mouse cerebral cortex were studied by [3H]thymidine autoradiography combined with immunohistochemistry for S-100 protein. S-100-positive cells in the stabbed cortex had the light and electron microscopic characteristics of astrocytes, and they showed remarkable hypertrophic changes 4 to 5 days after stabbing. There were many cells labeled with [3H]thymidine in the stabbed cortex from 24 h to 8 days after stabbing, and the number of labeled cells was maximum at 48 h. A few of the labeled cells were S-100-positive, and the labeled S-100-positive cells were seen 24 h to 6 days after stabbing, mostly after 72-96 h. By successive injections of [3H]thymidine for 6 days after stabbing, about 90% of labeled cells were S-100-negative, and about 90% of S-100-positive cells were unlabeled with [3H]thymidine. The increase in number of S-100-positive cells by day 6 after stabbing was not statistically significant (P greater than 0.05). These results suggest that reactive proliferation of astrocytes is a minor phenomenon in gliosis of injured cerebral cortex, in contrast with their remarkable reactive hypertrophy.
Miyake
T
T
Department of Pathology, Fukui Medical School, Japan.
Hattori
T
T
Fukuda
M
M
Kitamura
T
T
D000818:Animals; D001253:Astrocytes / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D001930:Brain Injuries / Q000473:pathology* / Q000503:physiopathology; D002455:Cell Division; D006984:Hypertrophy; D007150:Immunohistochemistry; D051379:Mice; D008813:Mice, Inbred ICR; D008854:Microscopy, Electron; D009418:S100 Proteins / Q000378:metabolism*; D013997:Time Factors
D009418:S100 Proteins