Document Detail

Quantitative study of deoxycytidine incorporation in large and small lymphocytes of the mouse.
MedLine Citation:
PMID:  6605195     Owner:  NLM     Status:  MEDLINE    
Using radioautographic smear preparations of thymocytes and mesenteric lymph node (MLN) cells labelled with three different tritiated pyrimidine deoxyribonucleosides, the incorporation of DNA precursors was studied separately on large lymphocytes and small lymphocytes. Radioautographic reaction due to generally tritiated deoxycytidine ( [G-3H]CdR) labelling in vivo in large lymphocytes was more intense than that in small lymphocytes. When mice were sacrificed 6 hr after the administration of tritiated thymidine ( [3H]TdR), small lymphocytes were labelled more heavily than large lymphocytes. However, labelling intensity with [3H]TdR in large lymphocytes was greatly enhanced by the administration of 5-fluoro-deoxyuridine, whereas in small lymphocytes labelling intensity was only fairly enhanced by the same treatment. When cells were incubated in vitro with 5-tritium labelled deoxycytidine [( 5-3H]CdR) for 10 min, there was no significant difference in labelling intensities between large and small lymphocytes. In the case of [G-3H]CdR incorporation, the labelling intensity in large lymphocytes was found to be significantly stronger than that in small lymphocytes. Large as well as small lymphocytes incorporated [3H]TdR very well in vitro. However, addition of 5 X 0 X 10(-5) M of non-radioactive CdR to the medium greatly decreased the incorporation of [3H]TdR by large lymphocytes, whereas the effect of non-radioactive CdR in small lymphocytes was not so marked as that in large lymphocytes. Furthermore, the [3H]TdR-labelling percentages were decreased at the same rate by the addition of non-radioactive CdR in both large and small lymphocytes. These results indicate that large lymphocytes and a proportion of small lymphocytes have a strong tendency to convert CdR to thymidine mono-phosphate, which is utilized for DNA synthesis, whereas this ability is relatively weak in the rest of small lymphocytes. Thus, it is probably that this metabolic ability changes during the transition of the large lymphocyte to the small lymphocyte.
K Hamatani; A Kawahara; M Amano
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Cell and tissue kinetics     Volume:  16     ISSN:  0008-8730     ISO Abbreviation:  Cell Tissue Kinet     Publication Date:  1983 Nov 
Date Detail:
Created Date:  1983-12-17     Completed Date:  1983-12-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0174107     Medline TA:  Cell Tissue Kinet     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  557-70     Citation Subset:  IM    
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MeSH Terms
DNA / biosynthesis
Deoxycytidine / metabolism*
Lymph Nodes / cytology
Lymphocytes / cytology,  metabolism*
Mice, Inbred ICR
T-Lymphocytes / metabolism*
Thymidine / metabolism
Thymidine Monophosphate / metabolism
Reg. No./Substance:
365-07-1/Thymidine Monophosphate; 50-89-5/Thymidine; 9007-49-2/DNA; 951-77-9/Deoxycytidine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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