Abstract：
:T cell clones reactive to beta-cell antigens prepared from different species were established in order to identify putative pathogenic T cells in human IDDM. We were able to generate T cell clones from patients, but not from controls, reactive specifically to the insulin secretory enriched fraction (ISG) of a rat insulinoma RIN cell line. This finding is suggestive of an in vivo priming by the antigen(s). To examine the relevance of these T cell clones in the pathogenesis of IDDM, we studied their cytokine profile. T cell clones from the newly onset patients had a Th1 cytokine profile, while those from the prediabetic patient were of the Th2 subtype. This segregation suggests that RIN-ISG contains antigen(s) involved in the pathogenesis of this disease, since IDDM is considered a cell-mediated or Th1 disease. Since two of these clones also responded to a hamster insulinoma cell line HIT, at least two antigens in RIN-ISG could be defined by this panel of T cell clones. Examination of CDR3 sequences confirmed the clonality of the dual-reactive T cell clones. The finding of HIT-reactive cells in IDDM patients may be useful in efforts to identify prediabetic patients for immune intervention. Dual reactivity may provide a better prognosis than single reactivity. In contrast to T cell clones reactive to insulinomas, T cell clones reactive to normal human ISG were not found after over 200 clones were screened. In addition, RIN-ISG specific clones did not respond to either normal human or rat ISG, suggesting that IDDM antigens are below detectable levels in normal beta cells.
journal_name
J Autoimmunjournal_title
Journal of autoimmunityauthors
Chang JC,Linarelli LG,Laxer JA,Froning KJ,Caralli LL,Brostoff SW,Carlo DJdoi
10.1006/jaut.1995.0017subject
Has Abstractpub_date
1995-04-01 00:00:00pages
221-34issue
2eissn
0896-8411issn
1095-9157pii
S0896-8411(85)70017-0journal_volume
8pub_type
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