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American Journal of Pathology, Vol 89, 367-378, Copyright © 1977 by American Society for Investigative Pathology

REGULAR ARTICLES

Radiosensitivity of T and B lymphocytes. V. Effects of whole-body irradiation on numbers of recirculating T cells and sensitization to primary skin grafts in mice

RE Anderson and WL Williams

Whole-body exposure of mice to 50, 100, 300, or 500 rads results in an acute dose-related decrease in the number of viable recirculating T cells. The magnitude of this decrement becomes more pronounced with the passage of time. The dose-response relationship over this range of dosages appears to consist of three components: a steep drop between 0 and 50 rads, a plateau between 50 and 500 rads, and a second drop between 300 and 500 rads. The residual radioresistant cells are able to recognize a histoincompatible skin graft during the initial 5 days after irradiation. Low to moderate doses (50 to 300 rads) abrogate the partial tolerance noted in nonirradiated recipients exposed to the skin graft for 5 days and then regrafted from the same donor source 25 days after complete removal of the primary graft. A large (500 rads) dose results in prolonged graft survival in comparison with the nonirradiated group. It is suggested that the subpopulation fo recirculating T cells which develops partial tolerance during a 5-day exposure to a homograft is more radiosensitive than the effector subpopulation which is involved in graft rejection.


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Copyright © 1977 by the American Society for Investigative Pathology.