Since cell dying in heart failure (HF) may vary based on the aetiology, we examined the main forms of regulated necrosis, such as necroptosis and pyroptosis, in the hearts damaged due to myocardial infarction (MI) or pressure overload. We also investigated the effects of a drug inhibiting RIP3, a proposed convergent point for both these necrosis-like cell death modes. In rat hearts, left ventricular function, remodelling, pro-cell death, and pro-inflammatory events were investigated, and the pharmacodynamic action of RIP3 inhibitor (GSK'872) was assessed. Regardless of the HF aetiology, the heart cells were dying due to necroptosis, albeit the upstream signals may be different. Pyroptosis was observed only in post-MI HF. The dysregulated miRNAs in post-MI hearts were accompanied by higher levels of a predicted target, HMGB1, its receptors (TLRs), as well as the exacerbation of inflammation likely originating from macrophages. The RIP3 inhibitor suppressed necroptosis, unlike pyroptosis, normalised the dysregulated miRNAs and tended to decrease collagen content and affect macrophage infiltration without affecting cardiac function or structure. The drug also mitigated the local heart inflammation and normalised the higher circulating HMGB1 in rats with post-MI HF. Elevated serum levels of HMGB1 were also detected in HF patients and positively correlated with C-reactive protein, highlighting pro-inflammatory axis. In conclusion, in MI-, but not pressure overload-induced HF, both necroptosis and pyroptosis operate and might underlie HF pathogenesis. The RIP3-targeting pharmacological intervention might protect the heart by preventing pro-death and pro-inflammatory mechanisms, however, additional strategies targeting multiple pro-death pathways may exhibit greater cardioprotection.

1st Faculty of Medicine Institute of Anatomy Charles University Prague Czech Republic

Centre of Experimental Medicine Institute for Heart Research Slovak Academy of Sciences Bratislava Slovak Republic

Faculty of Medicine Department of Cardiology Comenius University and National Cardiovascular Institute Bratislava Slovak Republic

Faculty of Natural Sciences Department of Animal Physiology and Ethology Comenius University Bratislava Slovak Republic

Faculty of Pharmacy Department of Pharmacology and Toxicology Comenius University Odbojárov 10 832 32 Bratislava Slovak Republic

Institute for Clinical and Experimental Medicine Prague Czech Republic

Institute of Biotechnology Czech Academy of Sciences Prague Czech Republic

Institute of Physiology Czech Academy of Sciences Prague Czech Republic

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