Nuclear DAMP complex-mediated RAGE-dependent macrophage cell death

作者：Chen, Ruochan; Fu, Sha; Fan, Xue-Gong; Lotze, Michael T.; Zeh, Herbert J., III; Tang, Daolin^*; Kang, Rui

来源：Biochemical and Biophysical Research Communications, 2015, 458(3): 650-655.

DOI：10.1016/j.bbrc.2015.01.159

• HMGB1
• Histone
• DNA
• RAGE
• TNF alpha
• Akt

High mobility group box 1 (HMGB1), histone, and DNA are essential nuclear components involved in the regulation of chromosome structure and function. In addition to their nuclear function, these molecules act as damage-associated molecular patterns (DAMPs) alone or together when released extracellularly. The synergistic effect of these nuclear DNA-HMGB1-histone complexes as DAMP complexes (nDCs) on immune cells remains largely unexplored. Here, we demonstrate that nDCs limit survival of macrophages (e.g., RAW264.7 and peritoneal macrophages) but not cancer cells (e.g., HCT116, HepG2 and Hepa1-6). nDCs promote production of inflammatory tumor necrosis factor alpha (TNF alpha) release, triggering reactive oxygen species-dependent apoptosis and necrosis. Moreover, the receptor for advanced glycation end products (RAGE), but not toll-like receptor (TLR)-4 and TLR-2, was required for Akt-dependent TNF alpha release and subsequent cell death following treatment with nDCs. Genetic depletion of RAGE by RNAi, antioxidant N-Acetyl-L-cysteine, and TNF alpha neutralizing antibody significantly attenuated nDC-induced cell death. These findings provide evidence supporting novel signaling mechanisms linking nDCs and inflammation in macrophage cell death.

• 出版日期2015-3-13
• 单位中南大学