Mechanical stress induces tumor necrosis factor-α production through Ca2+ release-dependent TLR2 signaling

被引:20
作者
Kim, Han Geun [1 ,2 ]
Kim, Joo Yun [1 ,2 ,3 ,4 ]
Gim, Min Geun [1 ,2 ]
Lee, Jung Min [1 ,2 ]
Chung, Dae Kyun [1 ,2 ]
机构
[1] Kyung Hee Univ, Grad Sch Biotechnol, Yongin 449701, South Korea
[2] Kyung Hee Univ, Inst Life Sci & Resources, Yongin 449701, South Korea
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Cardiol, Seoul, South Korea
[4] Sungkyunkwan Univ, Sch Med, Samsung Biomed Res Inst, Seoul, South Korea
来源
AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY | 2008年 / 295卷 / 02期
关键词
centrifugation; Toll-like receptor; THP-1; cells;
D O I
10.1152/ajpcell.00085.2008
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
We studied centrifugation-mediated mechanical stress-induced tumor necrosis factor-alpha (TNF-alpha) production in the monocyte-like cell line THP-1. The induction of TNF-alpha by mechanical stress was dependent on the centrifugation speed and produced the highest level of TNF-alpha after 1 h of stimulation. TNF-alpha production returned to normal levels after 24 h of stimulation. Mechanical stress also induced Toll-like receptor-2 (TLR2) mRNA in proportion to the expression of TNF-alpha. The inhibition of TLR2 signaling by dominant negative myeloid differentiation factor 88 (MyD88) blocked TNF-alpha expression response to mechanical stress. After transient overexpression of TLR2 in HEK-293 cells, mechanical stress induced TNF-alpha mRNA production. Interestingly, mechanical stress activated the c-Src-dependent TLR2 phosphorylation, which is necessary to induce Ca2+ fluxes. When THP-1 cells were pretreated with BAPTA-AM, thapsigargin, and NiCl2 center dot 6H(2)O, followed by mechanical stimulation, both TLR2 and TNF-alpha production were inhibited, indicating that centrifugation-mediated mechanical stress induces both TLR2 and TNF-alpha production through Ca2+ releases from intracellular Ca2+ stores following TLR2 phosphorylation. In addition, TNF-alpha treatment in THP-1 cells induced TLR2 production in response to mechanical stress, whereas the preincubation of anti-TNF-alpha antibody scarcely induced the mechanical stress-mediated production of TLR2, indicating that TNF-alpha produced by mechanically stimulated THP-1 cells affected TLR2 production. We concluded that TNF-alpha production induced by centrifugation-mediated mechanical stress is dependent on MyD88-dependent TLR2 signaling that is associated with Ca2+ release and that TNF-alpha production induced by mechanical stress affects TLR2 production.
引用
收藏
页码:C432 / C439
页数:8
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