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Related Experiment Videos

Radiation-induced clastogenic plasma factors.

G B Faguet, S M Reichard, D A Welter

    Cancer Genetics and Cytogenetics
    |May 1, 1984
    PubMed
    Summary

    Ionizing radiation exposure creates plasma factors that damage chromosomes in cells. This radiation-induced clastogenic activity in plasma persists for weeks and originates from irradiated cells.

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    Area of Science:

    • Radiation biology
    • Genetics
    • Toxicology

    Background:

    • Ionizing radiation causes chromosomal damage, with mutagenic and carcinogenic potential.
    • The role of radiation-induced plasma factors in clastogenicity is not fully understood.

    Purpose of the Study:

    • To investigate if radiation-induced plasma factors contribute to the clastogenic effects of irradiation.
    • To characterize the nature and persistence of these plasma factors.

    Main Methods:

    • Rats underwent total body irradiation (250 R or 400 R).
    • Plasma and cells were collected at various time points post-irradiation.
    • Nonirradiated cells were exposed to irradiated serum in vitro.
    • Cytogenetic analysis of metaphases was performed to assess chromosomal aberrations.

    Main Results:

    • Irradiated rat serum induced significant hyperdiploidy and chromatid breaks in nonirradiated cells.
    • This clastogenic activity appeared promptly and persisted for 10 weeks.
    • In vitro irradiation of serum did not induce clastogenic effects.
    • The activity stemmed from circulating factors released by irradiated cells, not plasma component changes.

    Conclusions:

    • Irradiation of rats leads to the rapid emergence of plasma-borne clastogenic factors.
    • These factors, originating from irradiated cells, contribute to chromosomal damage and persist in circulation.

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