Document Detail

Autoradiographic investigations of glial proliferation in the brain of adult mice. II. Cycle time and mode of proliferation of neuroglia and endothelial cells.
MedLine Citation:
PMID:  1123464     Owner:  NLM     Status:  MEDLINE    
The cycle time of the proliferating glial cells outside the subependymal layer of the lateral ventricle as well as that of endothelial cells was studied autoradiographically in the brains of adult and untreated mice. To determine the mean cycle time two independent methods were used. A mean cycle time of about 20 hours was obtained for glial and endothelial cells from the decrease of the mean grain number/nucleus as a function of time after tritiated thymidine (3H-TdR) injection. Another group of experiments utilized the "method of labeled S phases". With this method the passage of labeled cells through successive S phases is observed. Passing through S phase following 3H-TdR injection the 3H-labeled cells are double labeled by an additional 14C-TdR injection. This method again resulted in a cycle time of 20 hours for glial and endothelial cells. From the present work and a former study (Korr et al., '73) the following cell cycle parameters were derived: Cycle time 20 hours; S phase 9.4 hours; G2 less than three hours; (G2+M) five hours; G1 five hours. The growth fraction of glial cells related to all glial cells is only 0.004. Furthermore, the present experiments show that in the case of glial cells 17% of the daughter cells after mitosis become pyknotic and are eliminated from the glial cell population. Apart from this cell loss, after mitosis about one-fourth of the daughter cells do not enter the next S phase. These cells leave the growth fraction and are replaced by a corresponding number of non-proliferating glial cells. There is a relatively extensive permanent exchange of cells between the growth fraction and non-growth fraction of glial cell.
H Korr; B Schultze; W Maurer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  160     ISSN:  0021-9967     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  1975 Apr 
Date Detail:
Created Date:  1975-07-07     Completed Date:  1975-07-07     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  477-90     Citation Subset:  IM    
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MeSH Terms
Brain / metabolism,  physiology*
Cell Division*
Endothelium / physiology*
Neuroglia / metabolism,  physiology*
Thymidine / metabolism
Time Factors
Reg. No./Substance:
10028-17-8/Tritium; 50-89-5/Thymidine

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