Article

Ganoderic acid A protects neural cells against NO stress injury in vitro via stimulating β adrenergic receptors

Authors: Zi-ru Yu1, Wei-hua Jia1, Chao Liu1, Hong-qing Wang1, Hai-guang Yang1, Guo-rong He1, Ruo-yun Chen1, Guan-hua Du1
1 State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of Drug Target and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
Correspondence to: Guan-hua Du: dugh@imm.ac.cn,
DOI: 10.1038/s41401-020-0356-z
Received: 18 June 2019
Accepted: 1 January 2020
Advance online: 11 February 2020

Abstract

Excessive nitric oxide (NO) causes extensive damage to the nervous system, and the adrenergic system is disordered in many neuropsychiatric diseases. However, the role of the adrenergic system in protection of the nervous system against sodium nitroprusside (SNP) injury remains unclear. In this study, we investigated the effect of ganoderic acid A (GA A) against SNP injury in neural cells and the role of adrenergic receptors in GA A neuroprotection. We found that SNP (0.125−2mM) dose-dependently decreased the viability of both SH-SY5Y and PC12 cells and markedly increased NO contents. Pretreatment with GA A(10μM) significantly attenuated SNP-induced cytotoxicity and NO increase in SH-SY5Y cells, but not in PC12 cells. Furthermore, pretreatment with GA A caused significantly higher adrenaline content in SH-SY5Y cells than in PC12 cells. In order to elucidate the mechanism of GA A-protecting SH-SY5Y cells, we added adrenaline, phentolamine, metoprolol, or ICI 118551 1 h before GA A was added to the culture medium. We found that addition of adrenaline (10 μM) significantly improved GA A protection in PC12 cells. The addition of β1-adrenergic receptor antagonist metoprolol (10 μM) or β2-adrenergic receptor antagonist ICI 118551 (0.1 μM) blocked the protective effect of GA A, whereas the addition of α-adrenergic receptor antagonist phentolamine (0.1 μM) did not affect GA A protection in SH-SY5Y cells. These results suggest that β-adrenergic receptors play an important role in the protection of GA A in SH-SY5Y cells against SNP injuries, and excessive adrenaline system activation caused great damage to the nervous system.
Keywords: β-adrenergic receptors; sodium nitroprusside (SNP); SH-SY5Y cells; PC12 cells; ganoderic acid A; adrenaline; norepinephrine; phentolamine; metoprolol; ICI 118551

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