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The Journal of Immunology, 2001, 166: 747-753.
Copyright © 2001 by The American Association of Immunologists

Regulation of the CTL Response by Macrophage Migration Inhibitory Factor

Riichiro Abe*, Tina Peng*, Joseph Sailors*, Richard Bucala{dagger} and Christine N. Metz1,*

Laboratories of * Vascular Biology and {dagger} Medical Biochemistry, The Picower Institute for Medical Research, Manhasset, NY 11030

Macrophage migration inhibitory factor (MIF) has been shown to be a pivotal cytokine that mediates host inflammatory and immune responses. Recently, immunoneutralization of MIF has been found to inhibit tumor growth in mice; however, the contributing mechanisms underlying this effect have not been well defined. We investigated whether MIF plays a regulatory role in the expression of CTL activity. In a mouse model of the CTL response using the OVA-transfected tumor cell line EL4 (EG.7), we found that cultures of splenocytes obtained from EG.7-primed mice secrete high levels of MIF following Ag stimulation in vitro. Notably, parallel splenocyte cultures treated with neutralizing anti-MIF mAb showed a significant increase in the CTL response directed against EG.7 cells compared with control mAb-treated cultures. This effect was accompanied by elevated expression of IFN-{gamma}. Histological examination of the EG.7 tumors from anti-MIF-treated animals showed a prominent increase in both CD4+ and CD8+ T cells as well as apoptotic tumor cells, consistent with the observed augmentation of CTL activity in vivo by anti-MIF. This increased CTL activity was associated with enhanced expression of the common {gamma}c-chain of the IL-2R that mediates CD8+ T cell survival. Finally, CD8+ T lymphocytes obtained from the spleens of anti-MIF-treated EG.7 tumor-bearing mice, when transferred into recipient tumor-bearing mice, showed increased accumulation in the tumor tissue. These data provide the first evidence of an important role for MIF in the regulation and trafficking of anti-tumor T lymphocytes in vivo.




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