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Toxicol Lett. 2015 Nov 4;238(3):70-82. doi: 10.1016/j.toxlet.2015.08.011. Epub 2015 Aug 11.

Pyrroloquinoline quinone-conferred neuroprotection in rotenone models of Parkinson's disease.

Author information

1
Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong JS 226001, PR China.
2
Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong JS 226001, PR China; Medical School, Nantong University, 19 Qixiu Road, Nantong JS 226001, PR China.
3
Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong JS 226001, PR China. Electronic address: zhangqi@ntu.edu.cn.
4
Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong JS 226001, PR China. Electronic address: dingfei@ntu.edu.cn.

Abstract

Pyrroloquinoline quinone (PQQ), a redox cofactor in the mitochondrial respiratory chain, has proven to protect neurons against glutamate-induced damage both in vitro and in vivo. This study was aimed to investigate the possible neuroprotective effects of PQQ in rotenone-induced Parkinson's disease (PD) model. Pre-treatment with PQQ prevented cultured SH-SY5Y cells from rotenone-induced apoptosis, accompanied by modulation of apoptosis-related proteins (Bcl-2, Bax and Smac), restoration of the mitochondrial membrane potential, inhibition of intracellular reactive oxygen species (ROS) production, suppression of tyrosine residues nitration, and dopamine redistribution. PQQ also exerted protective effects in an in vivo PD model, which was created by rotenone injection into the medial forebrain bundle of rats. Co-injection with PQQ and rotenone improved the apomorphine-evoked rotation, decreased neuronal loss, increased the ROS-scavenging ability, regulated intracellular expressions of mitochondrial complex subunits (Ndufs1-4), tyrosine hydroxylase, and vesicular monoamine transporter 2. Taken together, our results collectively suggest that PQQ confers neuroprotection in rotenone-induced PD model probably through complex and multifaceted mechanisms, at least involving oxidative stress, mitochondrial integrity, and dopamine functions.

KEYWORDS:

Dopamine; Neuroprotection; Parkinson’s disease (PD); Pyrroloquinoline quinone (PQQ); Reactive oxygen species (ROS); Rotenone

PMID:
26276080
DOI:
10.1016/j.toxlet.2015.08.011
[Indexed for MEDLINE]

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