Abstract:
:Natural killer T (NKT) cells are innate-like T cells that recognize specific microbial antigens and also display autoreactivity to self-antigens. The nature of NKT-cell autoreactive activation remains poorly understood. We show here that the mitogen-activated protein kinase (MAPK) pathway is operative during human NKT-cell autoreactive activation, but calcium signaling is severely impaired. This results in a response that is biased toward granulocyte macrophage colony-stimulating factor (GM-CSF) secretion because this cytokine requires extracellular signal-regulated kinase (ERK) signaling but is not highly calcium dependent, whereas interferon-gamma (IFN-gamma), interleukin (IL)-4, and IL-2 production are minimal. Autoreactive activation was associated with reduced migration velocity but did not induce arrest; thus, NKT cells retained the ability to survey antigen presenting cells (APCs). IL-12 and IL-18 stimulated autoreactively activated NKT cells to secrete IFN-gamma, and this was mediated by Janus kinase-signal transducers and activators of transcription (JAK-STAT)-dependent signaling without induction of calcium flux. This pathway did not require concurrent contact with CD1d(+) APCs but was strictly dependent on preceding autoreactive stimulation that induced ERK activation. In contrast, NKT-cell responses to the glycolipid antigen alpha-galactosyl ceramide (alpha-GalCer) were dampened by prior autoreactive activation. These results show that NKT-cell autoreactivity induces restricted cytokine secretion and leads to altered basal activation that potentiates innate responsiveness to costimulatory cytokines while modulating sensitivity to foreign antigens.
journal_name
Bloodjournal_title
Bloodauthors
Wang X,Chen X,Rodenkirch L,Simonson W,Wernimont S,Ndonye RM,Veerapen N,Gibson D,Howell AR,Besra GS,Painter GF,Huttenlocher A,Gumperz JEdoi
10.1182/blood-2008-05-157529subject
Has Abstractpub_date
2008-11-15 00:00:00pages
4128-38issue
10eissn
0006-4971issn
1528-0020pii
blood-2008-05-157529journal_volume
112pub_type
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