FATE OF THYMOCYTES: STUDIES WITH 125I-IODODEOXYURIDINE AND 3H-THYMIDINE IN MICE |
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Authors: | D. D. Joel A. D. Chanana H. Cottier E. P. Cronkite J. A. Laissue |
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Affiliation: | Medical Research Center, Brookhaven National Laboratory, Upton, L.I., New York, and Institute of Pathology, University of Bern, Switzerland |
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Abstract: | Cortical thymocytes of young adult mice were labeled in situ with radioactive DNA precursors. As a result of cell emigration and cell death, total thymic radioactivity decreased within 8 days to 10% or less of that present on day 1. Accumulation of thymic migrants in peripheral lymphoid organs was estimated by computing the net thymus-derived radioactivity in these tissues. Thymic cell death was assessed by comparing values obtained with 125I-UdR to those acquired with 3H-TdR. The results indicate that cortical thymocytes migrate to the spleen, mesenteric lymph node, femurs and intestine; nevertheless, only a small fraction of the activity originally present in the thymus was recovered in these organs; the vast majority of newly formed cortical thymocytes apparently die after a relatively short life span. Exclusive of the fraction which dies in situ, evidence for thymocyte death is seen in bone marrow; however, most migrants appear to terminate in the intestine. |
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