Abstract
Cardiac hypertrophy is an adaptive response triggered by many physiological and pathological conditions and will lead to heart failure eventually. Sestrin 2, which is a stress-responsive protein, was reported to protect heart from ischemia reperfusion injury. However, the role of Sestrin 2 in cardiac hypertrophy remains unknown. In our present study, we aimed to explore the effects of Sestrin 2 on cardiomyocyte hypertrophy. We found that knockdown of Sestrin 2 protein aggravated cardiomyocyte hypertrophy induced by phenylephrine (PE), featured by increased hypertrophic marker ANP and cell surface area. During this process, ERK1/2 cascade was further activated, while p38, JNK1/2, and mTOR signaling pathways were not affected by downregulation of Sestrin 2. Moreover, overexpression of Sestrin 2 protein protected cardiomyocytes from PE-induced hypertrophy and ERK1/2 cascade was suppressed correspondingly. Importantly, pharmacological inhibition of ERK1/2 eliminated the exacerbated hypertrophic phenotype due to Sestrin 2 protein knockdown. In conclusion, we discovered that Sestrin 2 protected against cardiomyocyte hypertrophy induced by PE via inhibiting ERK1/2 signaling.
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Abbreviations
- PE:
-
Phenylephrine
- Hi 95:
-
Hypoxia-inducible gene 95
- MAPK:
-
Mitogen-activated protein kinase
- ERK1/2:
-
Extracellular signal-regulated protein kinase
- JNK1/2:
-
c-Jun N-terminal protein kinase
- mTOR:
-
Mammalian target of rapamycin
- mTORC1:
-
mTOR complex 1
- mTORC2:
-
mTOR complex 2
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Nos. 81200173, 81370338, 81470511 and 81570354), Guangdong Natural Science Foundation (Nos. S2013020012578 and 2015A030313111), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20120171110074), and Guangdong Scientific Program Foundation (No. 2012B031800300).
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Our ethical approval number is “[2014]A-176” (approved by ethical committee of Sun Yat-sen University). All of the experimental protocols complied with the guide for the care and use of laboratory animals published by the Animal Care and Use Committees of the Sun Yat-Sen University and guide for the care and use of laboratory animals published by the US National Institutes of Health.
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Dong, B., Xue, R., Sun, Y. et al. Sestrin 2 attenuates neonatal rat cardiomyocyte hypertrophy induced by phenylephrine via inhibiting ERK1/2. Mol Cell Biochem 433, 113–123 (2017). https://doi.org/10.1007/s11010-017-3020-2
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DOI: https://doi.org/10.1007/s11010-017-3020-2