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Specific protein 1 inhibitor mithramycin A protects cardiomyocytes from myocardial infarction via interacting with PARP

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Abstract

Specific protein 1 (SP1) might act as a critical transcription regulator in myocardial infarction (MI), but little evidence about its function in regulating cardiac apoptosis, a major cause of MI development, has been revealed. This study tried to investigate the role of SP1 in MI and its interaction with poly-ADP-ribose polymerase (PARP)-1 by using SP1 inhibitor, mithramycin A (mithA). Primary mouse cardiomyocytes and commercial mouse cardiomyocytes were subjected to mithA treatment under hypoxia conditions, while cell viability, Nix promoter activity, and its expression were detected correspondingly. PARP overexpression and knockdown were conducted, respectively, in mithA-treated and SP1-overexpressing cells. Co-immunoprecipitation was used to verify the interaction between PARP and SP1. For in vivo experiments, mithA administration was performed after the injections of adenovirus for PARP overexpression, and then, MI introduction was carried out. Infarct size and lactate dehydrogenase level were measured to assess MI injury. SP1 inhibitor mithA attenuated hypoxia-induced decrease of cell viability and Nix transcriptional activation, which could be inhibited by PARP overexpression. Knockdown of PARP prevented SP1-induced transcription of Nix and cell viability change, and PARP showed direct interaction with SP1. Furthermore, mithA administration reduced MI injuries, while PARP overexpression could suppress the improvement. The cardioprotective role of SP1 inhibitor mithA was demonstrated here expanding the role of SP1 in MI development involving hypoxia-induced cardiac apoptosis. Moreover, PARP acted as a transcriptional coactivator in Nix transcription involving its interaction with SP1.

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Funding

This study was supported by the Nantong Applied Research Project (Grant No. MS12018039).

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Authors and Affiliations

  1. Department of Cardiology, Affiliated Hospital of Nantong University, No. 20 Xisi Rd, Nantong, 226001, Jiangsu, China

    Haihua Geng, Yamin Su, Rong Huang, Mengkang Fan, Xiaofei Li, Xiaochen Lu & Hongzhuan Sheng

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  1. Haihua Geng
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  2. Yamin Su
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  7. Hongzhuan Sheng
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Correspondence to Hongzhuan Sheng.

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Editor: Tetsuji Okamoto

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Geng, H., Su, Y., Huang, R. et al. Specific protein 1 inhibitor mithramycin A protects cardiomyocytes from myocardial infarction via interacting with PARP. In Vitro Cell.Dev.Biol.-Animal 57, 315–323 (2021). https://doi.org/10.1007/s11626-021-00543-z

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