Document Detail

Cell-cycle-related metabolic and enzymatic events in proliferating rat thymocytes.
MedLine Citation:
PMID:  3258238     Owner:  NLM     Status:  MEDLINE    
Cell-cycle progression of rat thymocytes stimulated with concanavalin A and interleukin 2 was monitored at 12-h intervals by pulse labeling aliquots of the cell culture with [3H]thymidine, by measuring cellular DNA and protein content and by counting the number of cells in the cultures. The cell cycle was completed after 96 h of culture with the S phase peaking at 48 h. Early events in thymocyte activation were enhanced phosphatidylinositol turnover and the induction of ornithine decarboxylase. Concomitant changes were observed in the rates of DNA synthesis and glycolysis accompanied by a 20-fold increase in glucose uptake 48 h after stimulation. However, the maximal increment in the glycolytic rate preceded that of DNA synthesis by 12 h. Apart from the quantitative changes which occurred during the cell-cycle progression, there was also a change from partial aerobic glucose degradation to CO2 (26%) to almost complete anaerobic conversion of glucose to lactate (85%) and less than 3% to CO2. Glycolytic enzyme levels increased fourfold to tenfold and reached their maxima 48 h after mitogenic stimulation. Maximal increments of glycolytic enzyme activities preceded or coincided with the maximal increments of the glycolytic rate. Actinomycin D (1.5 ng/ml) completely inhibited DNA and RNA synthesis but did not show any inhibitory effect either on glycolytic enzyme induction or on enhanced glycolysis. During mitosis and return of the cells to the non-proliferative state, all of the enhanced metabolic rates returned to their initial levels and the elevated enzyme activities were decreased also. The marked changes of metabolic rates and enzyme activities observed at the various phases of the cell cycle suggest that these biochemical events may also serve as suitable parameters for evaluating the response of lymphocytes towards mitogens and lymphokines.
K Brand; S Aichinger; S Forster; S Kupper; B Neumann; W Nürnberg; G Ohrisch
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of biochemistry / FEBS     Volume:  172     ISSN:  0014-2956     ISO Abbreviation:  Eur. J. Biochem.     Publication Date:  1988 Mar 
Date Detail:
Created Date:  1988-05-11     Completed Date:  1988-05-11     Revised Date:  2007-07-23    
Medline Journal Info:
Nlm Unique ID:  0107600     Medline TA:  Eur J Biochem     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  695-702     Citation Subset:  IM    
Institute of Biochemistry, Faculty of Medicine, University of Erlangen-Nürnberg, Federal Republic of Germany.
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MeSH Terms
Cell Cycle / drug effects*
Cells, Cultured
Concanavalin A / pharmacology
DNA / analysis
Dactinomycin / pharmacology
Energy Metabolism
Glucose / metabolism
Interleukin-2 / pharmacology
Lymphocyte Activation
Ornithine Decarboxylase / metabolism
Phosphatidylinositols / metabolism
Proteins / analysis
Rats, Inbred Strains
Thymus Gland / drug effects,  enzymology,  metabolism*
Reg. No./Substance:
0/Interleukin-2; 0/Phosphatidylinositols; 0/Proteins; 11028-71-0/Concanavalin A; 50-76-0/Dactinomycin; 50-99-7/Glucose; 9007-49-2/DNA; EC Decarboxylase

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