Diabetes, Vol 37, Issue 8 1108-1112, Copyright © 1988 by American Diabetes Association
Progression from insulitis to beta-cell destruction in NOD mouse requires L3T4+ T-lymphocytes
B Charlton and TE Mandel
Transplantation Unit, Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Parkville, Victoria, Australia.
The identity of the cells responsible for beta-cell destruction in type I
(insulin-dependent) diabetes is still uncertain. L3T4+ T-lymphocytes have a
role in the initiation of insulitis and in damaging transplanted allogeneic
islets in nonobese diabetic (NOD) mice. The role of L3T4+ T-lymphocytes in
destruction of beta-cells of the NOD mouse was studied in cyclophosphamide
(CY)-induced diabetic NOD mice with a rat anti-L3T4 monoclonal antibody
(MoAb). After administration of CY, most untreated animals became diabetic,
whereas all antibody-treated animals remained normoglycemic. Insulitis was
still present in MoAb-treated animals, but immunocytochemical staining
showed rat antibody blocking the L3T4 antigen on T-lymphocytes. This study
provides further evidence that L3T4+ T-lymphocytes are critical to the
process of beta-cell destruction in NOD mice. The means by which L3T4+
cells exert their effect remains to be clarified.