Abstract:
:Antigen-specific regulatory CD4(+) T cells have been described but there are few reports on regulatory CD8(+) T cells. We generated islet-specific glucose-6-phosphatase catalytic subunit-related protein (IGRP)-specific regulatory CD8(+) T cells from 8.3-NOD transgenic mice. CD8(+) T cells from 8.3-NOD splenocytes were cultured with IGRP, splenic dendritic cells (SpDCs), TGF-beta, and all-trans retinoic acid (ATRA) for 5days. CD8(+) T cells cultured with either IGRP alone or IGRP and SpDCs in the absence of TGF-beta and ATRA had low Foxp3(+) expression (1.7+/-0.9% and 3.2+/-4.5%, respectively). In contrast, CD8(+) T cells induced by exposure to IGRP, SpDCs, TGF-beta, and ATRA showed the highest expression of Foxp3(+) in IGRP-reactive CD8(+) T cells (36.1+/-10.6%), which was approximately 40-fold increase compared with that before induction culture. CD25 expression on CD8(+) T cells cultured with IGRP, SpDCs, TGF-beta, and ATRA was only 7.42%, whereas CD103 expression was greater than 90%. These CD8(+) T cells suppressed the proliferation of diabetogenic CD8(+) T cells from 8.3-NOD splenocytes in vitro and completely prevented diabetes onset in NOD-scid mice in cotransfer experiments with diabetogenic splenocytes from NOD mice in vivo. Here we show that exposure to ATRA and TGF-beta induces CD8(+)Foxp3(+) T cells ex vivo, which suppress diabetogenic T cells in vitro and in vivo.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Kishi M,Yasuda H,Abe Y,Sasaki H,Shimizu M,Arai T,Okumachi Y,Moriyama H,Hara K,Yokono K,Nagata Mdoi
10.1016/j.bbrc.2010.02.176subject
Has Abstractpub_date
2010-03-26 00:00:00pages
228-32issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(10)00420-1journal_volume
394pub_type
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