Hsp70 and NF-kB Mediated Control of Innate Inflammatory Responses in a Canine Macrophage Cell Line.
The pathogenesis of many inflammatory diseases is associated with the uncontrolled activation of nuclear factor kappa B (NF-κB) in macrophages. Previous studies have shown that in various cell types, heat shock protein 70 (Hsp70) plays a crucial role in controlling NF-κB activity. So far, little is known about the role of Hsp70 in canine inflammatory processes. In this study we investigated the potential anti-inflammatory effects of Hsp70 in canine macrophages as well as the mechanisms underlying these effects. To this end, a canine macrophage cell line was stressed with arsenite, a chemical stressor, which upregulated Hsp70 expression as detected by flow cytometry and qPCR. A gene-edited version of this macrophage cell line lacking inducible Hsp70 was generated using CRISPR-Cas9 technology. To determine the effects of Hsp70 on macrophage inflammatory properties, arsenite-stressed wild-type and Hsp70 knockout macrophages were exposed to lipopolysaccharide (LPS), and the expression of the inflammatory cytokines IL-6, IL-1β and tumor necrosis factor-α (TNF-α) and levels of phosphorylated NF-κB were determined by qPCR and Western Blotting, respectively. Our results show that non-toxic concentrations of arsenite induced Hsp70 expression in canine macrophages; Hsp70 upregulation significantly inhibited the LPS-induced expression of the pro-inflammatory mediators TNF-α and IL-6, as well as NF-κB activation in canine macrophages. Furthermore, the gene editing of inducible Hsp70 by CRISPR-Cas9-mediated gene editing neutralized this inhibitory effect of cell stress on NF-κB activation and pro-inflammatory cytokine expression. Collectively, our study reveals that Hsp70 may regulate inflammatory responses through NF-κB activation and cytokine expression in canine macrophages.
['Lyu|Qingkang|Q|', 'Wawrzyniuk|Magdalena|M|', 'Rutten|Victor P M G|VPMG|0000-0002-6171-1805', 'van Eden|Willem|W|', 'Sijts|Alice J A M|AJAM|', 'Broere|Femke|F|']
D000818:Animals D018053:Arsenites D002460:Cell Line D016207:Cytokines D004285:Dogs D018840:HSP70 Heat-Shock Proteins D020672:I-kappa B Proteins D007249:Inflammation D015850:Interleukin-6 D008070:Lipopolysaccharides D008264:Macrophages D000072000:NF-KappaB Inhibitor alpha D016328:NF-kappa B D009569:Nitric Oxide D010766:Phosphorylation D015398:Signal Transduction D014409:Tumor Necrosis Factor-alpha
macrophages NF-κB heat shock protein cytokines