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Early Elevation of α1-Fetoprotein in N-2-Fluorenylacetamide Hepatocarcinogenesis

Frederick F. Becker and Stewart Sell
Frederick F. Becker
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Stewart Sell
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DOI:  Published October 1974
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Summary

Utilizing a radioimmunoassay capable of detecting ng quantities of circulating rat α1-fetoprotein, we examined the induction of this protein by N-2-fluorenylacetamide. Extremely small quantities of N-2-fluroenylacetamide, approximately 1% of a carcinogenic dose, caused a rapid and significant elevation of α1-fetoprotein that persisted for a considerable period after removal of the carcinogen from the diet. Although the most rapid and often highest elevations were achieved in male rats, comparable elevations were eventually demonstrated in female rats of strains that had selective defects in the metabolic activation of the carcinogen. The elevation in all groups preceded any detectable tissue alteration and was apparently unrelated to cell injury or cell division.

We suggest that the increase in circulating α1-fetoprotein seen after minimal N-2-fluorenylacetamide exposure is the result of a highly selective derepression of protein synthesis that occurs following the formation of a complex between the metabolite(s) of the carcinogen and specific chromatin loci.

Footnotes

  • ↵1 Supported by NIH Research Grant CA-12141 and Contract VO-1-CP-33403.

  • Received April 15, 1974.
  • Accepted June 11, 1974.
  • ©1974 American Association for Cancer Research.
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October 1974
Volume 34, Issue 10
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Early Elevation of α1-Fetoprotein in N-2-Fluorenylacetamide Hepatocarcinogenesis
Frederick F. Becker and Stewart Sell
Cancer Res October 1 1974 (34) (10) 2489-2494;

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Early Elevation of α1-Fetoprotein in N-2-Fluorenylacetamide Hepatocarcinogenesis
Frederick F. Becker and Stewart Sell
Cancer Res October 1 1974 (34) (10) 2489-2494;
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Cancer Research Online ISSN: 1538-7445
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