Angiotensin AT(2) receptor stimulation inhibits activation of NADPH oxidase and ameliorates oxidative stress in rotenone model of Parkinson's disease in CATH.a cells

作者：Lu Jie; Wu Liang; Jiang Teng; Wang Yao; Zhao Hongrui; Gao Qing; Pan Yang; Tian Youyong; Zhang Yingdong^*

来源：Neurotoxicology and Teratology, 2015, 47: 16-24.

DOI：10.1016/j.ntt.2014.11.004

• Parkinson's disease
• CGP42112
• Oxidative stress
• Rotenone
• CATH.a neurons

Oxidative stress has long been considered as a major contributing factor in the pathogenesis of Parkinson's disease (PD). The brain has an independent local renin-angiotensin system (RAS). Angiotensin II (Ang II) activates NADPH-dependent oxidases, which are a major source of superoxide and are upregulated in major aging-related diseases such as hypertension and neurodegenerative disease. In this study, we firstly examined whether CGP42112, an AT(2) receptor (AT(2)R) agonist, may exert direct protective effects on the rotenoneinduced CATH.a cell injury in vitro. We used CATH.a cell line to evaluate changes in cultured dopaminergic neuron levels of superoxide dismutase (SOD), glutathione (GSH) and reactive oxygen species (ROS). We also evaluated expression of NADPH oxidase, AT(1) and AT(2) receptors in treated with phosphate buffer saline (PBS), rotenone, Ang II, AT(2)R agonist CGP42112, or AT(2)R antagonist PD123319, alone and combined (n = 6, each group). Quantitative reverse transcriptase PCR (qRT-PCR) and western blot were used to determine messenger RNA (mRNA) and protein levels of the AT(1), AT(2) receptors and NADPH oxidase. ROS generation was determined by the dichlorodihydrofluorescein diacetate fluorescent probe assay. The levels of SOD and GSH were measured by using available kits. In our study, CGP42112 (100 nM) significantly reduced rotenone-induced oxidative stress and elevated the total SOD activity and GSH level. In addition, CGP42112 significantly increased AT(2)R expression and attenuated Ang II-induced NADPH oxidase activation, and these effects were completely abolished by the AT(2)R antagonist, PD123319 (1 mu M). Our results suggest that CGP42112 attenuates rotenone-induced oxidative stress in CATH.a neuron via activating AT(2)R and suppressing NADPH oxidase expression.

• 出版日期2015-2
• 单位南京医科大学