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Sacubitril/valsartan reduces endoplasmic reticulum stress in a rat model of doxorubicin-induced cardiotoxicity

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Abstract

The induction of endoplasmic reticulum (ER) stress has been reported as a key contributor to the cardiotoxicity of doxorubicin. Previous in vitro and in vivo studies suggest that sacubitril/valsartan, a novel angiotensin receptor–neprilysin inhibitor, could be effective against doxorubicin-induced cardiotoxicity. However, the precise mechanisms are not fully understood. Therefore, we investigated whether the cardioprotective effects of sacubitril/valsartan are associated with ER stress modulation in a rat model of doxorubicin-induced cardiotoxicity. Male Sprague–Dawley rats were treated with intraperitoneal injections of doxorubicin (15 mg/kg; cumulative) or saline for 3 weeks. From the day before the first treatment, control animals were gavaged daily with water (n = 8), whereas doxorubicin-treated animals were gavaged daily with water (n = 8) or sacubitril/valsartan (60 mg/kg/day; n = 8) for 6 weeks. Echocardiography was performed 6 weeks after the initiation of doxorubicin. In addition, serum troponin I and N-terminal brain natriuretic peptide levels were determined, and the extent of apoptosis and protein levels related to ER stress in the cardiac tissue and doxorubicin-treated H9c2 cardiomyocytes were analyzed. Sacubitril/valsartan significantly reduced doxorubicin-induced cardiac dysfunction and apoptosis in the myocardium. In addition, sacubitril/valsartan significantly downregulated the expression levels of proteins related to apoptosis and ER stress, including BAX, caspase 3, GRP78, PERK, IRE-1α, ATF-6, eIF-2α, ATF-4, and CHOP, in the myocardium of a rat model of doxorubicin-induced cardiotoxicity in vivo and doxorubicin-treated H9c2 cardiomyocytes in vitro. Sacubitril/valsartan significantly alleviated doxorubicin-induced cardiotoxicity, which may be associated with the reduction of ER stress.

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The interpreted and analyzed data from this study are available from the corresponding author upon reasonable request.

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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Conceptualization: JHS and YHL. Methodology: BSK and IHP. Formal analysis: AHL and HJK. Investigation: IHP and AHL. Data curation: BSK and HJK. Writing—original draft preparation: BSK and IHP. Writing—review and editing: JHS and YHL. Supervision: JHS and YHL.

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Correspondence to Young-Hyo Lim or Jeong-Hun Shin.

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The research protocol was approved by the Hanyang University Institutional Animal Care and Use Committee.

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204_2022_3241_MOESM2_ESM.jpg

Supplementary Fig. S1 Effects of Dox and Sac/Val on the viability of H9c2 cardiomyocytes The cells were treated with increasing concentrations of (a) Dox (10 nM to 10 μM) or (b) Sac/Val (1 μM to 20 μM). MTT assay was performed to measure cell viability (JPG 166 KB)

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Kim, B.S., Park, IH., Lee, AH. et al. Sacubitril/valsartan reduces endoplasmic reticulum stress in a rat model of doxorubicin-induced cardiotoxicity. Arch Toxicol 96, 1065–1074 (2022). https://doi.org/10.1007/s00204-022-03241-1

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  • DOI: https://doi.org/10.1007/s00204-022-03241-1

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