Xixing Zhao

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CXC chemokine receptor 2 (CXCR2) antagonism alone can reduce neutrophil infiltration of some inflammatory sites, but the CXCR1 and CXCR2 critically regulate neutrophil responses to Glu-Leu-Arg-CXC chemokines. Herein, we assessed a combined CXCR1/CXCR2 antagonist, CXC chemokine ligand 8(3-74) [CXCL8(3-74)]K11R/G31P, for its ability to blunt neutrophil-influx(More)
BACKGROUND Neutrophil sequestration plays an important role in mediating local and remote organ injury induced by ischemia and reperfusion (I/R). The Glu-Leu-Arg (ELR)-CXC subfamily of chemokines, all CXCR1 or CXCR2 ligands, are primary agonists for such neutrophil recruitment. Herein, we assessed the effects of a combined CXCR1/CXCR2 antagonist,(More)
The ELR-CXC chemokines play important roles in neutrophilic inflammation. We report in this study that a fully human ELR-CXC chemokine antagonist that we have generated, CXCL8((3-72))K11R/G31P (G31P), has potent anti-inflammatory effects that arise through its actions at multiple levels. G31P inhibited CXCL8-induced chemotactic responses and intracellular(More)
Glu-Leu-Arg (ELR)-CXC chemokines are important in acute responses to bacterial infections, wherein neutrophils are often critical to pathogen clearance. However, excessive neutrophil recruitment augments the pathology of many diseases. We have shown that bovine CXCL8((3-74))K11R/G31P (bG31P) is a highly effective ELR-CXC chemokine and neutrophil antagonist(More)
Pneumonia associated with aspiration of bacterial-laden gastric contents is characterized by Glu-Leu-Arg (ELR)-CXC chemokine (e.g., CXC2L1, CXCL8) expression leading to local neutrophil sequestration. This neutrophil response is designed to be protective, but overly aggressive responses can be pathogenic in themselves. Herein we assessed whether blocking(More)
Although NF-κB1 p50/p105 has critical roles in immunity, the mechanism by which NF-κB1 regulates inflammatory responses is unclear. In this study, we analyzed the gene expression profile of LPS-stimulated Nfkb1(-/-) macrophages that lack both p50 and p105. Deficiency of p50/p105 selectively increased the expression of IFN-responsive genes, which correlated(More)
Airborne organic dusts in swine confinement facilities have detrimental effects on workers health. Bacterial endotoxins (i.e., lipopolysaccharides [LPS]) that contaminate these dusts have been implicated in their pro-inflammatory effects in the airways. Exposure to such dusts induces expression of ELR-CXC chemokines (e.g., interleukin [IL]-8), prototypical(More)
BACKGROUND Nfkb1-deficient murine macrophages express higher levels of IFN-β and IL-12 p40 following LPS stimulation than control macrophages, but the molecular basis for this phenomenon has not been completely defined. Nfkb1 encodes several gene products including the NF-κB subunit p50 and its precursor p105. p50 is derived from the N-terminal of 105, and(More)
The ELR-CXC chemokines are important to neutrophil inflammation in many acute and chronic diseases. Among them, CXCL8 (interleukin-8, IL-8), binds to both the CXCR1 and CXCR2 receptors with high affinity and the expression levels of CXCL8 are elevated in many inflammatory diseases. Recently, an analogue of human CXCL8, CXCL8((3-72))K11R/G31P (hG31P) has(More)
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