Summary
A series of bone marrow irradiation chimeras were constructed in an attempt to determine the site of the defect(s) leading to diabetes and/or lymphopoenia in the BB rat. In BB rats that were lethally irradiated and reconstituted with T-cell-depleted Wistar-Furth (WF) rat bone marrow, the incidence of diabetes was reduced, and in animals treated with WF bone marrow at < 44 days of age, the disease was completely prevented. Such animals demonstrated normal lymphocyte counts in peripheral blood, and normal lymphocyte function (as indicated by mixed lymphocyte response), but retained an abnormal T-cell subset distribution only partially improved above that of diabetes-prone BB rats. The incidence of diabetes in these irradiated chimeras was significantly reduced compared to the indicence in BB rats irradiated at the same age but reconstituted with bone marrow from BB rats. In WF rats that were lethally irradiated and reconstituted with T-cell-depleted bone marrow from overtly diabetic BB rats, no diabetes was induced. Such animals demonstrated normal lymphocyte counts in peripheral blood, normal lymphocyte function, and normal T-cell subset distributions. Overall, these results suggest two defects leading to diabetes and/or lymphopoenia in the BB rat. One of these occurs at the level of the bone marrow stem cell while the other resides in the T-cell differentiative environment.
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Scott, J., Engelhard, V.H. & Benjamin, D.C. Bone marrow irradiation chimeras in the BB rat: evidence suggesting two defects leading to diabetes and lymphopoenia. Diabetologia 30, 774–781 (1987). https://doi.org/10.1007/BF00275743
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DOI: https://doi.org/10.1007/BF00275743