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Interleukin-17A contributes to the development of post-operative atrial fibrillation by regulating inflammation and fibrosis in rats with sterile pericarditis.

Fu XX, Zhao N, Dong Q, Du LL, Chen XJ, Wu QF, Cheng X, Du YM, Liao YH - Int. J. Mol. Med. (2015)

Bottom Line: Western blot analysis was applied to quantify the expression of IL-17A.Quantitative PCR was used to detect the mRNA expression of IL-17A, IL-6, IL-1β, transforming growth factor-β1 (TGF-β1), collagen type 1 (Col-1), collagen type 3 (Col-3) and α-smooth muscle actin (α-SMA).Gelatin zymography and reverse gelatin zymography were used to quantify the levels of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs).

View Article: PubMed Central - PubMed

Affiliation: Research Center of Ion Channelopathy, Institute of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China.

ABSTRACT
Post-operative atrial fibrillation (AF) remains a common cause of morbidity. Increasing evidence indicates that inflammation and atrial fibrosis contribute to the pathogenesis of this condition. Interleukin (IL)-17A, a potent pro-inflammatory cytokine, has been implicated in the development of a number of cardiovascular diseases. However, its role in post-operative AF remains unknown. In the present study, sterile pericarditis (SP) was induced in rats by the epicardial application of sterile talc. AF was induced by transesophageal burst pacing. Western blot analysis was applied to quantify the expression of IL-17A. Quantitative PCR was used to detect the mRNA expression of IL-17A, IL-6, IL-1β, transforming growth factor-β1 (TGF-β1), collagen type 1 (Col-1), collagen type 3 (Col-3) and α-smooth muscle actin (α-SMA). Gelatin zymography and reverse gelatin zymography were used to quantify the levels of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs). Histological analyses were performed to determine the extent of tissue inflammation and fibrosis. The rats with SP presented with a shorter refractoriness, a higher incidence and duration of AF, an enhanced susceptibility to developing AF, increased mRNA levels of AF-related pro-inflammatory cytokines (IL-6, IL-1β and TGF-β1), as well as marked atrial inflammation and fibrosis. The atrial IL-17A levels were elevated and correlated with the probability of developing AF. Treatment with anti-IL-17A monoclonal antibody decreased the levels of atrial IL-17A, prolonged refraction and markedly suppressed the development of AF. Simultaneously, inflammation and fibrosis were alleviated, which was further demonstrated by a decreased expression of AF-related pro-inflammatory cytokines, a downregulation in fibrosis-related mRNA expression (Col-1, Col-3 and α-SMA) and by the decreased activity of MMP-2/9 and TIMPs. Thus, the findings of our study indicate that IL-17A may play a pathogenic role in post-operative AF by inducing inflammation and fibrosis in rats with SP.

No MeSH data available.


Related in: MedlinePlus

Effect of the neutralization of endogenous interleukin-17A (IL-17A) on the development of atrial fibrillation (AF) at 4 days after surgery in the rats with sterile pericarditis (SP). (A) Number of AF episodes. (B) Duration of AF episodes. (C) Probability of developing AF. (D) Atrial nodal refractory period (ARP). (E) Atrioventricular (AV) nodal refractory period (AVNRP). #P<0.05 and ##P<0.01 vs. IgG2a control group.
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f4-ijmm-36-01-0083: Effect of the neutralization of endogenous interleukin-17A (IL-17A) on the development of atrial fibrillation (AF) at 4 days after surgery in the rats with sterile pericarditis (SP). (A) Number of AF episodes. (B) Duration of AF episodes. (C) Probability of developing AF. (D) Atrial nodal refractory period (ARP). (E) Atrioventricular (AV) nodal refractory period (AVNRP). #P<0.05 and ##P<0.01 vs. IgG2a control group.

Mentions: To further investigate the role of IL-17A in post-operative AF, we treated the rats with SP systemically with neutralizing anti-IL-17A mAb 5 min prior to surgery. Our results revealed that the incidence and duration of AF episodes, as well as the probability of developing AF were significantly lower in the rats treated with anti-IL-17A mAb compared with those treated with the isotype control IgG2a (Fig. 4A–C). At the same time, treatment with anti-IL-17A mAb significantly increased the ARPs and AVNRPs to values comparable with those of the IgG2a control-treated group (Fig. 4D and E).


Interleukin-17A contributes to the development of post-operative atrial fibrillation by regulating inflammation and fibrosis in rats with sterile pericarditis.

Fu XX, Zhao N, Dong Q, Du LL, Chen XJ, Wu QF, Cheng X, Du YM, Liao YH - Int. J. Mol. Med. (2015)

Effect of the neutralization of endogenous interleukin-17A (IL-17A) on the development of atrial fibrillation (AF) at 4 days after surgery in the rats with sterile pericarditis (SP). (A) Number of AF episodes. (B) Duration of AF episodes. (C) Probability of developing AF. (D) Atrial nodal refractory period (ARP). (E) Atrioventricular (AV) nodal refractory period (AVNRP). #P<0.05 and ##P<0.01 vs. IgG2a control group.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494571&req=5

f4-ijmm-36-01-0083: Effect of the neutralization of endogenous interleukin-17A (IL-17A) on the development of atrial fibrillation (AF) at 4 days after surgery in the rats with sterile pericarditis (SP). (A) Number of AF episodes. (B) Duration of AF episodes. (C) Probability of developing AF. (D) Atrial nodal refractory period (ARP). (E) Atrioventricular (AV) nodal refractory period (AVNRP). #P<0.05 and ##P<0.01 vs. IgG2a control group.
Mentions: To further investigate the role of IL-17A in post-operative AF, we treated the rats with SP systemically with neutralizing anti-IL-17A mAb 5 min prior to surgery. Our results revealed that the incidence and duration of AF episodes, as well as the probability of developing AF were significantly lower in the rats treated with anti-IL-17A mAb compared with those treated with the isotype control IgG2a (Fig. 4A–C). At the same time, treatment with anti-IL-17A mAb significantly increased the ARPs and AVNRPs to values comparable with those of the IgG2a control-treated group (Fig. 4D and E).

Bottom Line: Western blot analysis was applied to quantify the expression of IL-17A.Quantitative PCR was used to detect the mRNA expression of IL-17A, IL-6, IL-1β, transforming growth factor-β1 (TGF-β1), collagen type 1 (Col-1), collagen type 3 (Col-3) and α-smooth muscle actin (α-SMA).Gelatin zymography and reverse gelatin zymography were used to quantify the levels of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs).

View Article: PubMed Central - PubMed

Affiliation: Research Center of Ion Channelopathy, Institute of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China.

ABSTRACT
Post-operative atrial fibrillation (AF) remains a common cause of morbidity. Increasing evidence indicates that inflammation and atrial fibrosis contribute to the pathogenesis of this condition. Interleukin (IL)-17A, a potent pro-inflammatory cytokine, has been implicated in the development of a number of cardiovascular diseases. However, its role in post-operative AF remains unknown. In the present study, sterile pericarditis (SP) was induced in rats by the epicardial application of sterile talc. AF was induced by transesophageal burst pacing. Western blot analysis was applied to quantify the expression of IL-17A. Quantitative PCR was used to detect the mRNA expression of IL-17A, IL-6, IL-1β, transforming growth factor-β1 (TGF-β1), collagen type 1 (Col-1), collagen type 3 (Col-3) and α-smooth muscle actin (α-SMA). Gelatin zymography and reverse gelatin zymography were used to quantify the levels of matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs). Histological analyses were performed to determine the extent of tissue inflammation and fibrosis. The rats with SP presented with a shorter refractoriness, a higher incidence and duration of AF, an enhanced susceptibility to developing AF, increased mRNA levels of AF-related pro-inflammatory cytokines (IL-6, IL-1β and TGF-β1), as well as marked atrial inflammation and fibrosis. The atrial IL-17A levels were elevated and correlated with the probability of developing AF. Treatment with anti-IL-17A monoclonal antibody decreased the levels of atrial IL-17A, prolonged refraction and markedly suppressed the development of AF. Simultaneously, inflammation and fibrosis were alleviated, which was further demonstrated by a decreased expression of AF-related pro-inflammatory cytokines, a downregulation in fibrosis-related mRNA expression (Col-1, Col-3 and α-SMA) and by the decreased activity of MMP-2/9 and TIMPs. Thus, the findings of our study indicate that IL-17A may play a pathogenic role in post-operative AF by inducing inflammation and fibrosis in rats with SP.

No MeSH data available.


Related in: MedlinePlus