Dapansutrile Ameliorates Atrial Inflammation and Vulnerability to Atrial Fibrillation in HFpEF Rats.

Heart Lung Circ

Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China; Cardiovascular Research Institute, Wuhan University, Wuhan, China; Hubei Key Laboratory of Cardiology, Wuhan, China. Electronic address:

Published: January 2024

Background: Numerous studies have demonstrated that NLRP3 inflammasomes are key players in the progression of atrial fibrillation (AF) in heart failure with preserved ejection fraction (HFpEF). This study aimed to analyse the effect of pharmacological inhibition of NLRP3 inflammasomes using dapansutrile (DAPA), an oral NLRP3-specific inhibitor.

Methods: Dahl salt-sensitive rats were fed a high-salt diet (HSD, 8% NaCl) to induce HFpEF. Either DAPA (200 mg/kg/day) or saline was administered daily via gavage for 4 weeks. Electrophysiological studies were performed to assess the AF inducibility. Confocal fluorescence microscopy and western blot analysis were used to study calcium handling.

Results: The DAPA-treated HFpEF rats were less prone to AF induction by programmed electrical stimulation. Atrial fibrosis and inflammation were attenuated in DAPA-treated HFpEF hearts. Dapansutrile treatment showed an increase in the Ca transient sarcoplasmic reticulum-Ca load, and protein expression of SERCA2; NCX1 and phosphorylation of PLB at Thr17 were decreased following DAPA treatment. The increased frequency of spontaneous Ca spark in the HFpEF rats was related to the hyperphosphorylation of RyR2 at Ser2814, which was blunted in DAPA treatment. Dapansutrile treatment also decreased the phosphorylation of CaMKII expression in the HFpEF rats. Mechanistically, DAPA exerts an anti-arrhythmic effect, mainly by inhibiting activation of the NLRP3 inflammasome.

Conclusion: These data provide evidence that the beneficial cardiac effects of DAPA are associated with reduced atrial inflammation and improved CaMKII-dependent Ca-handling abnormalities via blunting activation of the NLRP3 inflammasome, and DAPA may be beneficial in a rat model of HFpEF-induced AF.

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http://dx.doi.org/10.1016/j.hlc.2023.09.017DOI Listing

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