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J Clin Invest. 2007 Jul;117(7):1902-13.

MFG-E8-mediated uptake of apoptotic cells by APCs links the pro- and antiinflammatory activities of GM-CSF.

Author information

1
Department of Medical Oncology and Cancer Vaccine Center, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

Abstract

Granulocyte-macrophage colony-stimulating factor (GM-CSF) enhances protection against tumors and infections, but GM-CSF-deficient mice develop inflammatory disease. Here we show that GM-CSF is required for the expression of milk fat globule EGF 8 (MFG-E8) in antigen-presenting cells, and that MFG-E8-mediated uptake of apoptotic cells is a key determinant of GM-CSF-triggered tolerance and immunity. Upon exposure to apoptotic cells, GM-CSF-deficient antigen-presenting cells (APCs) produce an altered cytokine profile that results in decreased Tregs and increased Th1 cells, whereas concurrent ablation of IFN-gamma promotes Th17 cells. In wild-type mice, MFG-E8 attenuates the vaccination activity of GM-CSF-secreting tumor cells through Treg induction, whereas a dominant-negative MFG-E8 mutant potentiates GM-CSF-stimulated tumor destruction through Treg inhibition. These findings clarify the immunoregulatory effects of apoptotic cells and suggest new therapeutic strategies to modulate CD4(+) T cell subsets in cancer and autoimmunity.

PMID:
17557120
PMCID:
PMC1884688
DOI:
10.1172/JCI30966
[Indexed for MEDLINE]
Free PMC Article

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