The Journal of Experimental Medicine
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Published 2 June 2003. doi:10.1084/jem.20021842
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© Rockefeller University Press, 0022-1007/2003/6/1441 $5.00
The Journal of Experimental Medicine, Volume 197, Number 11, 1441-1452

Orphan Nuclear Receptor Nur77 Is Involved in Caspase-independent Macrophage Cell Death

Sung Ouk Kim, Koh Ono, Peter S. Tobias and Jiahuai Han

Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

Address correspondence to Jiahuai Han, Dept. of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037. Phone: (858) 784-8704; Fax: (858) 784-8665; E-mail: jhan{at}scripps.edu

Activation-induced cell death in macrophages has been observed, but the mechanism remains largely unknown. Activation-induced cell death in macrophages can be independent from caspases, and the death of activated macrophages can even be triggered by the pan-caspase inhibitor benzyloxycarbonyl-Val-Ala-Asp-fluoromethyl ketone (zVAD). Here, we show that this type of macrophage death can occur in the septic mouse model and that toll-like receptor (TLR)-2 or TLR4 signaling is required in this process. We conclude that Nur77 is involved in the macrophage death because Nur77 expression correlates with cell death, and cell death is reduced significantly in Nur77-deficient macrophages. The extracellular signal–regulated kinase pathway, which is downstream of TLR2 or TLR4, and myocyte-specific enhancer binding factor 2 (MEF2) transcription factor activity, which is up-regulated by zVAD, are required for Nur77 induction and macrophage death. Reporter gene analysis suggests that Nap, Ets, Rce, and Sp1 sites in the Nur77 promoter are regulated by TLR4 signaling and that MEF2 sites in the Nur77 promoter are regulated by zVAD treatment. MEF2 transcription factors are constitutively expressed and degraded in macrophages, and zVAD increases MEF2 transcription factor activity by preventing the proteolytic cleavage and degradation of MEF2 proteins. This paper delineates the dual signaling pathways that are required for Nur77 induction in macrophages and demonstrates a role of Nur77 in caspase-independent cell death.

Key Words: AICD • LPS • zVAD • MEF2


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