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- W2053493344 abstract "Micronucleated erythrocytes are selectively removed from the peripheral circulation of normal rats. Splenectomy prevents this selective removal. In normal rats treated daily for 20 days with 0.2 mg/kg triethylenemelamine (TEM), micronucleated normochromatic (mature) erythrocytes did not accumulate in peripheral blood. In these same animals, the frequencies of micronucleated cells among polychromatic (newly formed) erythrocytes increased from 0.21 to 5.25 per thousand in peripheral blood and from 1.75 to 31.5 per thousand in bone marrow. Since both control and induced frequencies in peripheral blood were approximately 15% of those in bone marrow, the removal appears to be equally efficient for cells containing either spontaneously occurring or clastogen-induced micronuclei. In splenectomized rats treated daily for 11 days with 0.2 mg/kg TEM, the frequency of micronucleated normochromatic erythrocytes (NCEs) in the peripheral blood rose rapidly to 9 times the control value and remained elevated for 50–55 days, indicating a life span approximately equivalent to that of normal erythrocytes. Among splenectomized rats exposed to either 0.15 mg/kg triethylenemelamine, 6.5 mg/kg cyclophosphamide, or 300 mg/kg urethane for periods exceeding the erythrocyte life span, the incidences of micronucleated NCEs in the peripheral blood rose steadily from a control value of 1.0 per thousand to maximum values of 15.0, 12.7 and 8.9 per thousand, respectively. During these extended exposures, the mean frequencies of micro-nucleated polychromatic erythrocytes (PCEs) in peripheral blood increased from a spontaneous value of 0.9 per thousand to 23.0, 13.0 and 6.6 per thousand, respectively, reflecting the frequencies among PCEs in the bone marrow and approximating the maximum values among NCEs in the peripheral blood. Thus, the frequency of micronucleated erythrocytes in the peripheral blood of splenectomized rats can be used as an index of both acute and cumulative chromosomal damage, while in normal rats the use of peripheral blood for cytogenetic monitoring is restricted by the selective removal of these micronucleated cells." @default.
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- W2053493344 date "1984-07-01" @default.
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- W2053493344 title "The persistence of micronucleated erythrocytes in the peripheral circulation of normal and splenectomized Fischer 344 rats: Implications for cytogenetic screening" @default.
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- W2053493344 doi "https://doi.org/10.1016/0027-5107(84)90018-6" @default.
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