Document Detail

Long-term persistence of ethyl carbamate-induced sister chromatid exchanges in murine lymphocytes.
MedLine Citation:
PMID:  4028004     Owner:  NLM     Status:  MEDLINE    
Ethyl carbamate-induced sister chromatid exchange (SCE) was evaluated at 20 min and 1, 3, 4.5, 5.5, 7, and 9 h postexposure (acute dose, ethyl carbamate, 3.3 mmol/kg) in concanavalin A (Con A)- and lipopolysaccharide (LPS)-stimulated murine peripheral blood lymphocytes (PBL). In both Con A- and LPS-stimulated PBL, SCE responses peaked between 4.5 and 5.5 h postinjection, a time which corresponds to complete biotransformation of ethyl carbamate. Peak induced SCEs for Con A- and LPS-stimulated PBL were 6.43 and 7.44, respectively. SCE responses were also evaluated in Con A- and LPS-stimulated PBL at 3 and 24 h following the last of a series of two, four, or six i.p. injections of ethyl carbamate (3.3 mmol/kg) given every other day. Dose-related increases (presumably reflecting the accumulation of unrepaired SCE-inducing damage) in SCEs were observed at both times following two and four injections of ethyl carbamate. However, following six injections a decrease in SCE response and increased cytotoxicity were observed. Persistence of SCE-inducing DNA lesions was observed in blood, spleen, and parathymic node lymphocytes following the last of a series of 12 i.p. injections (three times weekly) of ethyl carbamate (2.2 mmol/kg). With the exception of LPS-stimulated blood lymphocytes, exposed blood and spleen Con A- and LPS-stimulated lymphocyte populations contained a significantly higher number of high-frequency cells than did their respective controls at 16 weeks postexposure. The gradual return of SCE levels to base-line values appears to be primarily a consequence of slow population turnover. Parathymic node lymphocytes exhibited elevated SCE responses (2 times base-line levels) for up to 4 weeks postexposure.
R E Neft; M K Conner; T Takeshita
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cancer research     Volume:  45     ISSN:  0008-5472     ISO Abbreviation:  Cancer Res.     Publication Date:  1985 Sep 
Date Detail:
Created Date:  1985-09-30     Completed Date:  1985-09-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2984705R     Medline TA:  Cancer Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  4115-21     Citation Subset:  IM    
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MeSH Terms
Concanavalin A / pharmacology
DNA / biosynthesis
Lipopolysaccharides / pharmacology
Lymphocytes / drug effects*,  ultrastructure
Mice, Inbred C57BL
Mice, Inbred DBA
Sister Chromatid Exchange / drug effects*
Time Factors
Urethane / toxicity*
Grant Support
1 R01 CA 33869-01/CA/NCI NIH HHS
Reg. No./Substance:
0/Carcinogens; 0/Lipopolysaccharides; 11028-71-0/Concanavalin A; 51-79-6/Urethane; 9007-49-2/DNA

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