Neurochemical Research

, Volume 32, Issue 3, pp 489–495

Pyrroloquinoline Quinone is a Potent Neuroprotective Nutrient Against 6-Hydroxydopamine-Induced Neurotoxicity

Authors

    • Department of Clinical PharmaceuticsGifu Pharmaceutical University
  • Hideaki Hiramatsu
    • Department of Clinical PharmaceuticsGifu Pharmaceutical University
  • Tetsuo Adachi
    • Department of Clinical PharmaceuticsGifu Pharmaceutical University
Original Paper

DOI: 10.1007/s11064-006-9257-x

Cite this article as:
Hara, H., Hiramatsu, H. & Adachi, T. Neurochem Res (2007) 32: 489. doi:10.1007/s11064-006-9257-x

Abstract

Pyrroloquinoline quinone (PQQ), which is an essential nutrient, has been shown to act as an antioxidant. Reactive oxygen species (ROS) are thought to be responsible for neurotoxicity caused by the neurotoxin 6-hydroxydopamine (6-OHDA). In this study, we investigated the ability of PQQ to protect against 6-OHDA-induced neurotoxicity using human neuroblastoma SH-SY5Y. When SH-SY5Y cells were exposed to 6-OHDA in the presence of PQQ, PQQ prevented 6-OHDA-induced cell death and DNA fragmentation. Flow cytometry analysis using the ROS-sensitive fluorescence probe, dihydroethidium, revealed that PQQ reduced elevation of 6-OHDA-induced intracellular ROS. In contrast to PQQ, antioxidant vitamins, ascorbic acid and α-tocopherol, had no protective effect. Moreover, we showed that PQQ effectively scavenged superoxide, compared to the antioxidant vitamins. Therefore, our results suggest the protective effect of PQQ on 6-OHDA-induced neurotoxicity is involved, at least in part, in its function as a scavenger of ROS, especially superoxide.

Keywords

Pyrroloquinoline quinoneAntioxidant6-HydroxydopamineOxidative stressNeuroprotection

Copyright information

© Springer Science+Business Media, LLC 2007