Exogenous carbon monoxide inhibits neutrophil infiltration in LPS-induced sepsis by interfering with FPR1 via p38 MAPK but not GRK2.

Exogenous carbon monoxide inhibits neutrophil infiltration in LPS-induced sepsis by interfering with FPR1 via p38 MAPK but not GRK2.
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外源性一氧化碳通过 p38 MAPK 但不干扰 GRK2 干扰 FPR1,从而抑制 LPS 诱导的脓毒症中的中性粒细胞浸润

DOI:
10.18632/oncotarget.9084
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发表时间:
2016-06-07
期刊:
影响因子:
--
通讯作者:
Sun B
Sun B
中科院分区:
其他
文献类型:
--
作者:
Wang X;Qin W;Song M;Zhang Y;Sun B

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重要器官中的过度中性粒细胞浸润对患有脓毒症的患者是威胁生命的。我们确定了外源性一氧化碳(CO)在抑制中性粒细胞浸润在脂多糖(LPS)诱导的脓毒症的关键作用。CORM-2释放的CO显著提高了C57 BL/6小鼠在LPS刺激下的存活率。CORM-2显著抑制肝和肺中的中性粒细胞浸润以及炎症反应的标志物。亲和素基因芯片分析显示,趋化因子受体甲酰肽受体1(FPR 1)的表达增加可能有助于过度的中性粒细胞浸润。琼脂糖凝胶下迁移实验表明,LPS刺激可促进细胞向FPR 1的配体N-甲酰基-Met-Leu-Phe(fMLP)的迁移,而CORM-2处理可抑制这种迁移。进一步的研究表明CORM-2通过抑制p38丝裂原活化蛋白激酶(MAPK)而非G蛋白偶联受体激酶2(GRK 2)内化FPR 1,这可能解释了CORM-2对LPS刺激的中性粒细胞的抑制作用。总之,我们的研究表明,外源性CO抑制脓毒症诱导的中性粒细胞浸润通过干扰FPR 1通过p38 MAPK,而不是GRK 2。
Excessive neutrophil infiltration in vital organs is life-threatening to patients who suffer from sepsis. We identified a critical role of exogenous carbon monoxide (CO) in the inhibition of neutrophil infiltration during lipopolysaccharide (LPS)-induced sepsis. CO delivered from carbon monoxide-releasing molecule 2 (CORM-2) dramatically increased the survival rate of C57BL/6 mice subjected to LPS in vivo. CORM-2 significantly suppressed neutrophil infiltration in liver and lung as well as markers of inflammatory responses. Affymetrix GeneChip array analysis revealed that the increased expression of chemoattractant receptor formyl peptide receptor 1 (FPR1) may contribute to the excessive neutrophil infiltration. The under agarose migration assay demonstrated that LPS stimulation promoted migration to the ligand of FPR1, N-Formyl-Met-Leu-Phe (fMLP) but that CORM-2 treatment inhibited this promotion. Further studies demonstrated that CORM-2 internalized FPR1 by inhibiting p38 mitogen-activated protein kinase (MAPK) but not G protein-coupled receptor kinase 2 (GRK2), which may explain the inhibitory effect of CORM-2 on LPS-stimulated neutrophils. In summary, our study demonstrates that exogenous CO inhibits sepsis-induced neutrophil infiltration by interfering with FPR1 via p38 MAPK but not GRK2.
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