Abstract
Inhibition of nitric oxide synthases (NOSs) shows promise to halt the progression of neurodegenerative diseases. The present study was designed to explore whether botanical isoflavone puerarin could attenuate nitric oxide (NO)-mediated neurotoxicity via modulating the enzymes in the L-arginine–NO pathway. Neurotoxin 6-hydroxydopamine (6-OHDA) is well known to induce neurodegeneration via a NO-dependent mechanism. We first validated that puerarin protected rat dopamingeric PC12 cells against 6-OHDA-induced neurotoxicity in a concentration-dependent manner. We subsequently profiled the cellular responses to puerarin by a proteomic response fingerprinting approach. A total of 16 protein spots with >1.5-fold change of intensity were selected and identified by mass spectrometry. As one of puerarin-upregulated proteins, mitochondrial arginase-2 hydrolyzes L-arginine to L-ornithine, thereby competing with neuronal NOS for substrate L-arginine in mitochondria. Thus, we hypothesize that puerain may attenuate nitric oxide (NO)-mediated mitochondrial injury via increasing arginase-2 expression. Western blot and reverse transcription polymerase chain reaction (RT-PCR) analyses confirmed that puerarin increased arginase-2 expression in a concentration- and time-dependent manner. Accordingly, puerarin suppressed 6-OHDA-induced NO production and neurotoxicity in PC12 cells and primary rat midbrain neurons. Arginase inhibitor BEC diminished the effect of puerarin on 6-OHDA-induced NO production and neurotoxicity. The activation of arginase-2 by puerarin represents an endogenous mechanism for specific control of NO-mediated mitochondrial damage. Thus, puerarin is a useful lead for suppressing NO-mediated neurotoxicity in neurodegenerative diseases.
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Acknowledgments
The authors are grateful to Miss Zhaohui Liang for her excellent technical assistance. This work was supported by General Research Fund (GRF) (HKU 775812 M) from the Research Grants Council of Hong Kong and the Seed Funding for Basic Research Programme, The University of Hong Kong.
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The authors declare that there is no conflict of interest.
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Zhao, J., Cheng, Y., Yang, C. et al. Botanical Drug Puerarin Attenuates 6-Hydroxydopamine (6-OHDA)-Induced Neurotoxicity via Upregulating Mitochondrial Enzyme Arginase-2. Mol Neurobiol 53, 2200–2211 (2016). https://doi.org/10.1007/s12035-015-9195-1
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DOI: https://doi.org/10.1007/s12035-015-9195-1