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 Blood, 1 October 2007, Vol. 110, No. 7, pp. 2565-2568.
Prepublished online as a Blood First Edition Paper on July 9, 2007; DOI 10.1182/blood-2006-11-058800.

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IMMUNOBIOLOGY

Brief Report

TIM-1 and TIM-3 enhancement of Th2 cytokine production by mast cells

Susumu Nakae1,3, Motoyasu Iikura1, Hajime Suto1,3, Hisaya Akiba4, Dale T. Umetsu5, Rosemarie H. DeKruyff5, Hirohisa Saito2, and Stephen J. Galli1

1 Department of Pathology, Stanford University School of Medicine, Stanford, CA; 2 Department of Allergy and Immunology, National Research Institute for Child Health and Development, Tokyo, Japan; 3 Atopy Research Center, Juntendo University, Tokyo, Japan; 4 Department of Immunology, Juntendo University, Tokyo, Japan; and 5 Division of Immunology, Children's Hospital Boston, Harvard Medical School, Boston, MA

Members of the T-cell immunoglobulin– and mucin-domain–containing molecule (TIM) family have roles in T-cell–mediated immune responses. TIM-1 and TIM-2 are predominantly expressed on T helper type 2 (Th2) cells, whereas TIM-3 is preferentially expressed on Th1 and Th17 cells. We found that TIM-1 and TIM-3, but neither TIM-2 nor TIM-4, were constitutively expressed on mouse peritoneal mast cells and bone marrow–derived cultured mast cells (BMCMCs). After IgE + Ag stimulation, TIM-1 expression was down-regulated on BMCMCs, whereas TIM-3 expression was up-regulated. We also found that recombinant mouse TIM-4 (rmTIM-4), which is a ligand for TIM-1, as well as an anti–TIM-3 polyclonal Ab, can promote interleukin-4 (IL-4), IL-6, and IL-13 production without enhancing degranulation in BMCMCs stimulated with IgE + Ag. Moreover, the anti–TIM-3 Ab, but neither anti–TIM-1 Ab nor rmTIM-4, suppressed mast-cell apoptosis. These observations suggest that TIM-1 and TIM-3 may be able to influence T-cell–mediated immune responses in part through effects on mast cells.


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