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We are analyzing https://link.springer.com/article/10.1007/s00395-016-0584-z.

Title:
Cross-talk between macrophages and atrial myocytes in atrial fibrillation | Basic Research in Cardiology
Description:
Increased macrophage accumulation occurs in the atria of patients with atrial fibrillation (AF). However, the phenotype and functions of the macrophages in AF remain unclear. We investigated the macrophage-atrial myocyte interaction in AF patients and found that the increased macrophages were mainly pro-inflammatory macrophages (iNOS+, Arg1−). Tachypacing of HL-1 atrial myocytes also led to pro-inflammatory macrophage polarization. In addition, lipopolysaccharide (LPS)-stimulated pro-inflammatory macrophages-induced atrial electrical remodeling, evidenced by increased AF incidence and decreased atrial effective refractory period and L-type calcium currents (I Ca-L) in both canine and mouse AF models. Depletion of macrophages relieved LPS-induced atrial electrical remodeling, confirming the role of pro-inflammatory macrophages in the pathogenesis of AF. We also found that the effect of LPS-stimulated macrophages on atrial myocytes was mediated by secretion of interleukin 1 beta (IL-1β), which inhibited atrial myocyte quaking protein (QKI) expression. IL-1β knockout in macrophages restored the LPS-stimulated macrophage-induced inhibition of QKI and CACNA1C (α1C subunit of L-type calcium channel) in atrial myocytes. Meanwhile, QKI overexpression in atrial myocytes restored the LPS-stimulated macrophage-induced electrical remodeling through enhanced binding of QKI to CACNA1C mRNA, which upregulated the expression of CACNA1C as well as I Ca-L. In contrast, QKI knockout inhibited CACNA1C expression. Finally, using transcription factor activation profiling plate array and chromatin immunoprecipitation, we revealed that special AT-rich sequence binding protein 1 activated QKI transcription. Taken together, our study uncovered the functional interaction between macrophages and atrial myocytes in AF. AF induced pro-inflammatory macrophage polarization while pro-inflammatory macrophages exacerbated atrial electrical remodeling by secreting IL-1β, further inhibiting QKI expression in atrial myocytes, which contributed to I Ca-L downregulation. Our study demonstrates a novel molecular mechanism underlying the pathogenesis and progression of AF and suggests that QKI is a potential therapeutic target.
Website Age:
28 years and 1 months (reg. 1997-05-29).

Matching Content Categories {📚}

  • Education
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Custom-built

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🌠 Phenomenal Traffic: 5M - 10M visitors per month


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Keywords {🔍}

atrial, macrophages, qki, pubmed, article, expression, google, scholar, cells, proinflammatory, cas, macrophage, fig, remodeling, increased, cacnac, ilβ, fibrillation, electrical, lpsstimulated, patients, control, myocytes, lps, protein, inflammation, statistical, mice, result, found, medium, satb, inhibited, performed, study, heart, model, group, cardiol, central, polarization, chen, antiinflammatory, cardiomyocytes, overexpression, tnfα, rna, role, mediated, mrna,

Topics {✒️}

prophylactic high-dose oral-n-acetylcysteine lps-stimulated macrophage-induced inhibition l-type calcium channel macrophage-induced electrical remodeling c-kit+/cd45− stem cell l-type calcium currents transcription factor-dna complex tumor necrosis factor-alpha tumor necrosis factor-{alpha} pro-inflammatory/anti-inflammatory macrophages [58] pro-inflammatory/anti-inflammatory macrophages pro-inflammatory macrophage polarization m1/m2 macrophage polarization tumor necrosis factor-α ubiquitin-dependent degradation steady-state channel inactivation article download pdf lps-stimulated macrophage medium macrophage-atrial myocyte interaction stimulate pro-inflammatory macrophage tumor growth factor-β1 lps-triggered electrical disorder phenol–chloroform–isoamyl alcohol c-reactive protein concentrations electrical remodeling induced pro-inflammatory cytokines secreted stimulate pro-inflammatory macrophages lps-stimulated macrophages led longest s1–s2 interval rna-binding protein qki5 increased pro-inflammatory macrophages alternatively activated monocytes/macrophages anti-inflammatory cytokines secreted apolipoprotein e-deficient mice rapidly-activated atrial cells tumor necrosis factor cas9-il1β-puro electrical remodeling compared develop pro-inflammatory macrophages increased il-1β expression atrial electrical remodeling cas9-qki-puro vector pro-inflammatory marker inos reduced infarct size full access cas9-qki-gfp vector qki-positive atrial cardiomyocyte microrna-155-deficient dendritic cells 50 μl jetpei-macrophage solution enhancing anti-inflammatory

Questions {❓}

  • Boos CJ, Anderson RA, Lip GY (2006) Is atrial fibrillation an inflammatory disorder?
  • First, which macrophage phenotype is increased in the atria?
  • Jansen MF, Hollander MR, van Royen N, Horrevoets AJ, Lutgens E (2016) CD40 in coronary artery disease: a matter of macrophages?

Schema {🗺️}

WebPage:
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         headline:Cross-talk between macrophages and atrial myocytes in atrial fibrillation
         description:Increased macrophage accumulation occurs in the atria of patients with atrial fibrillation (AF). However, the phenotype and functions of the macrophages in AF remain unclear. We investigated the macrophage-atrial myocyte interaction in AF patients and found that the increased macrophages were mainly pro-inflammatory macrophages (iNOS+, Arg1−). Tachypacing of HL-1 atrial myocytes also led to pro-inflammatory macrophage polarization. In addition, lipopolysaccharide (LPS)-stimulated pro-inflammatory macrophages-induced atrial electrical remodeling, evidenced by increased AF incidence and decreased atrial effective refractory period and L-type calcium currents (I Ca-L) in both canine and mouse AF models. Depletion of macrophages relieved LPS-induced atrial electrical remodeling, confirming the role of pro-inflammatory macrophages in the pathogenesis of AF. We also found that the effect of LPS-stimulated macrophages on atrial myocytes was mediated by secretion of interleukin 1 beta (IL-1β), which inhibited atrial myocyte quaking protein (QKI) expression. IL-1β knockout in macrophages restored the LPS-stimulated macrophage-induced inhibition of QKI and CACNA1C (α1C subunit of L-type calcium channel) in atrial myocytes. Meanwhile, QKI overexpression in atrial myocytes restored the LPS-stimulated macrophage-induced electrical remodeling through enhanced binding of QKI to CACNA1C mRNA, which upregulated the expression of CACNA1C as well as I Ca-L. In contrast, QKI knockout inhibited CACNA1C expression. Finally, using transcription factor activation profiling plate array and chromatin immunoprecipitation, we revealed that special AT-rich sequence binding protein 1 activated QKI transcription. Taken together, our study uncovered the functional interaction between macrophages and atrial myocytes in AF. AF induced pro-inflammatory macrophage polarization while pro-inflammatory macrophages exacerbated atrial electrical remodeling by secreting IL-1β, further inhibiting QKI expression in atrial myocytes, which contributed to I Ca-L downregulation. Our study demonstrates a novel molecular mechanism underlying the pathogenesis and progression of AF and suggests that QKI is a potential therapeutic target.
         datePublished:2016-09-22T00:00:00Z
         dateModified:2016-09-22T00:00:00Z
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            Atrial fibrillation
            Macrophage-atrial myocyte interaction
            Interleukin 1 beta
            Quaking protein
            Cardiology
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ScholarlyArticle:
      headline:Cross-talk between macrophages and atrial myocytes in atrial fibrillation
      description:Increased macrophage accumulation occurs in the atria of patients with atrial fibrillation (AF). However, the phenotype and functions of the macrophages in AF remain unclear. We investigated the macrophage-atrial myocyte interaction in AF patients and found that the increased macrophages were mainly pro-inflammatory macrophages (iNOS+, Arg1−). Tachypacing of HL-1 atrial myocytes also led to pro-inflammatory macrophage polarization. In addition, lipopolysaccharide (LPS)-stimulated pro-inflammatory macrophages-induced atrial electrical remodeling, evidenced by increased AF incidence and decreased atrial effective refractory period and L-type calcium currents (I Ca-L) in both canine and mouse AF models. Depletion of macrophages relieved LPS-induced atrial electrical remodeling, confirming the role of pro-inflammatory macrophages in the pathogenesis of AF. We also found that the effect of LPS-stimulated macrophages on atrial myocytes was mediated by secretion of interleukin 1 beta (IL-1β), which inhibited atrial myocyte quaking protein (QKI) expression. IL-1β knockout in macrophages restored the LPS-stimulated macrophage-induced inhibition of QKI and CACNA1C (α1C subunit of L-type calcium channel) in atrial myocytes. Meanwhile, QKI overexpression in atrial myocytes restored the LPS-stimulated macrophage-induced electrical remodeling through enhanced binding of QKI to CACNA1C mRNA, which upregulated the expression of CACNA1C as well as I Ca-L. In contrast, QKI knockout inhibited CACNA1C expression. Finally, using transcription factor activation profiling plate array and chromatin immunoprecipitation, we revealed that special AT-rich sequence binding protein 1 activated QKI transcription. Taken together, our study uncovered the functional interaction between macrophages and atrial myocytes in AF. AF induced pro-inflammatory macrophage polarization while pro-inflammatory macrophages exacerbated atrial electrical remodeling by secreting IL-1β, further inhibiting QKI expression in atrial myocytes, which contributed to I Ca-L downregulation. Our study demonstrates a novel molecular mechanism underlying the pathogenesis and progression of AF and suggests that QKI is a potential therapeutic target.
      datePublished:2016-09-22T00:00:00Z
      dateModified:2016-09-22T00:00:00Z
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         Atrial fibrillation
         Macrophage-atrial myocyte interaction
         Interleukin 1 beta
         Quaking protein
         Cardiology
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      name:Hongfei Xu
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            address:
               name:Department of Cardiothoracic Surgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
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      name:Liangrong Zheng
      affiliation:
            name:Zhejiang University
            address:
               name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
               type:PostalAddress
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      email:[email protected]
PostalAddress:
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiothoracic Surgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
      name:Department of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China

External Links {🔗}(307)

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