Abstract
Thymocytes from NZB and DBA/2 mice were injected into lethally irradiated C57 B1/6 recipients. DNA synthesis in spleen and lymph node was measured as the incorporation of radioactive 5-iodo-2-deoxyuridine. The generation of cytotoxic effector cells was also studied in an in vitro cytotoxicity assay, with EL-4 lymphoma target cells. The kinetics of DNA synthesis were similar for 2- and 8-week-old DBA/2 donors and for 2-week-old NZB donors with a peak on day 4. Thymocytes from 8-week-old and 9-month-old NZB donors showed a delayed onset of DNA synthesis which was still increasing on day 6. When NZB donor thymocytes from 2- and 8-week-old mice were mixed together before injections, as few as 25% of 8-week-old cells gave a DNA synthetic response characteristic of this aged population. These results suggest an abnormal thymocyte development in NZB mice which may relate to the subsequent emergence of autoimmune disease.
MeSH Terms
Age Factors
Animals
Cell Line
Chromium Radioisotopes
Cytotoxicity Tests, Immunologic
DNA/biosynthesis
Histocompatibility
Idoxuridine/metabolism
Iodine Radioisotopes
Lymphocyte Activation
Lymphoma/immunology
Mice
Mice, Inbred C57BL
Mice, Inbred NZB/immunology
Radiation Chimera
T-Lymphocytes/immunology,metabolism,transplantation
Transplantation, Homologous
Chemicals
Chromium Radioisotopes
Iodine Radioisotopes
DNA
Idoxuridine
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Dauphinee M J
Talal N
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