Abstract:
:A minor subset of murine MHC class I-restricted T cells which express both the alphabeta form of the T cell receptor and a NK lineage marker, termed NKT cells, is capable of secreting significant amounts of Interleukin-4 and Interferon-y upon activation. As such NKT cells may play a role in development of Th1 and Th2 cells during T cell ontogeny or expansion of T cells expressing a dominant cytokine pattern in the effector phase. We have studied the role of NKT cells in a murine model of disease multidose streptozotocin induced diabetes mellitus (MDSDM). In MDSDM thymic and splenic NKT cells are present at normal levels but have greatly reduced capacity to secrete Interleukin-4 upon stimulation with anti-TCR antibody compared to control mice; conversely, Interferon-y secretion is maintained. By analysis of cytokine RNA production we found that treatment of several strains of mice with streptozotocin changes the peripheral helper T cell phenotype elicited after immunization with Keyhole Limpet Hemocyanin from a mixed Th1- and Th2-type cytokine pattern (characterized by IFN-gamma and IL-4 and IL-5 expressions, respectively) to predominately Th1-type. Furthermore, susceptibility to MDSDM is significantly enhanced when NKT cells are selectively eliminated in vivo by administration of depleting anti-CD122 antibody TMbeta-1. In addition, antibody depletion of NKT cells from non-obese diabetic mice significantly accelerates onset of disease. Collectively these data support a model for development of murine diabetes mellitus in which NKT cell cytokine expression influences the development of Th1-type diabetogenic T cells.
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Frey AB,Rao TDdoi
10.3109/08916939908998535subject
Has Abstractpub_date
1999-01-01 00:00:00pages
201-14issue
3eissn
0891-6934issn
1607-842Xjournal_volume
29pub_type
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