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Processing by the thymus is not required for cells that cure and populate W/WV recipients

DE Harrison, CM Astle and JA DeLaittre

Adult marrow, fetal liver or nu/nu mouse marrow from histocompatible donors was grafted into genetically anemic W/WV recipients, and all three types of grafts cured thymectomized as well as intact W-anemic recipients. With the latter two types of graft, the genetic anemia was cured by cells that could not have been processed in a mature thymus, since the adult recipients were thymectomized before receiving the grafts, the nu/nu donors were congenitally thymusless, and the fetal donors were used at 16 days of gestation. Chromosome-marked marrow grafts were used to show that immune systems were populated to similar degrees in thymectomized and intact W/WV recipients. Therefore, the cells derived from the donor marrow graft that partially populate the immune systems of W-anemic recipients do not require thymus processing. Small numbers of liver rudiment or yolk sac cells from fetal donors less than 12 days old failed to cure W/WV recipients, even when mixed with adult thymus cells. Therefore, the lack of adequately developed thymic helper cells appears not to be the reason why early fetal hemopoietic stem cells fail to cure W/WV recipients.

Volume 54, Issue 5, pp. 1152-1157, 11/01/1979
Copyright © 1979 by The American Society of Hematology


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