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The Journal of Immunology, 2003, 171: 1507-1514.
Copyright © 2003 by The American Association of Immunologists

Murine Macrophages Produce Secretory Leukocyte Protease Inhibitor During Clearance of Apoptotic Cells: Implications for Resolution of the Inflammatory Response 1

Chikako Odaka2,*, Toshiaki Mizuochi*, Jingxuan Yang{dagger} and Aihao Ding{dagger}

* Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, Tokyo, Japan; and {dagger} Department of Microbiology and Immunology, Weill Medical College of Cornell University, New York, NY 10021

Macrophage-derived secretory leukocyte protease inhibitor (SLPI) can be induced locally as well as systemically in response to microbial products such as LPS and lipotechoic acid. It is not known whether phagocytosis of apoptotic cells, an essential function of macrophages, can regulate expression and secretion of SLPI. In this study, we report that exposure of peritoneal macrophages of BALB/c mice or murine macrophage cell lines RAW264.7 and J774.1 to apoptotic target cells induced an elevation in SLPI secretion. Secreted SLPI retained its antichymotrypsin activity. SLPI expression in thymuses from BALB/c mice that had been injected with anti-CD3 Ab to induce apoptosis of thymocytes was also elevated both at the mRNA and protein levels. Colchicine, a microtubular inhibitor, blocked the internalization of apoptotic cells by macrophages but not SLPI secretion, suggesting that surface recognition of apoptotic cells is sufficient for the induction of SLPI. Exposure of RAW264.7 cells to apoptotic CTLL-2 cells induced both SLPI and TNF-{alpha}, and addition of IFN-{gamma} inhibited SLPI but augmented TNF-{alpha} production. Transfection of either the secreted or a nonsecreted form of SLPI into RAW264.7 cells led to suppression of TNF-{alpha} production in response to apoptotic cells. Thus, macrophages secrete an increased amount of SLPI when encountering apoptotic cells, which may help to attenuate potential inflammation during clearance of these cells.




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