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J. Exp. Med.,
Volume 188, Number 5, September 7, 1998 887-896
By
From the Department of Ophthalmology and Visual Sciences and the Department of Pathology,
Washington University School of Medicine, St. Louis, Missouri 63110
Apoptosis is critical to homeostasis of multicellular organisms. In immune privileged sites such as
the eye, CD95 ligand (FasL)-induced apoptosis controls dangerous inflammatory reactions that
can cause blindness. Recently, we demonstrated that apoptotic cell death of inflammatory cells
was a prerequisite for the induction of immune deviation after antigen presentation in the eye. In
this report, we examine the mechanism by which this takes place. Our results show that Fas-
mediated apoptosis of lymphoid cells leads to rapid production of interleukin (IL)-10 in these
cells. The apoptotic cells containing IL-10 are responsible for the activation of immune deviation
through interaction with antigen-presenting cells (APC). In support of this, we found that apoptotic cells from IL-10+/+ animals fed to APC in vitro promote Th2 cell differentiation, whereas
apoptotic IL-10
/
cells, as well as nonapoptotic cells, favor Th1 induction. Thus, apoptotic cell
death and tolerance are linked through the production of an antiinflammatory cytokine to prevent dangerous and unwanted immune responses that might compromise organ integrity.
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