Baicalein Protects 6-OHDA-induced Neuronal Damage by Suppressing Oxidative Stress.
- Author:
Heh In IM
1
;
Eunjoo NAM
;
Eun sun LEE
;
Yu jin HWANG
;
Yong Sik KIM
Author Information
1. Department of Pharmacology, Seoul National University College of Medicine, Neuroscience Research Institute Medical Research Center, Seoul, Korea. kimysu@plaza.snu.ac.kr
- Publication Type:Original Article
- Keywords:
6-OHDA;
Baicalein;
Tyrosine hydroxylase;
Dopamine;
Oxidative stress;
Antioxidant
- MeSH:
Animals;
Apomorphine;
Dopamine;
Flavonoids;
Humans;
Immunohistochemistry;
Lipid Peroxidation;
Mice;
Neuroblastoma;
Neurons*;
Oxidative Stress*;
Oxidopamine;
Reactive Oxygen Species;
Scutellaria baicalensis;
Substantia Nigra;
Tyrosine 3-Monooxygenase
- From:The Korean Journal of Physiology and Pharmacology
2006;10(6):309-315
- CountryRepublic of Korea
- Language:English
-
Abstract:
The protective effects of baicalein, one of the flavonoids in Scutellaria baicalensis Georgi, were evaluated against 6-hydroxydopamine (6-OHDA)-induced neuronal damage in mice and cultured human neuroblastoma cells. Nigrostriatal damage was induced by stereotaxically injecting 6-OHDA into the right striatum. Baicalein was administered intraperitoneally 30 min before and 90 min after lesion induction. Animals received a further daily injection of baicalein for 3 consecutive days. Two weeks after 6-OHDA injection, contralateral rotational asymmetry was observed by apomorphine challenge in lesioned mice. Tyrosine hydroxylase (TH) immunohistochemistry revealed a significant loss of terminals in lesioned striatum and the reduction of the numbers of TH-positive cell in the ipsilateral substantia nigra (SN). In addition, the levels of dopamine (DA) and DA metabolites were reduced and lipid peroxidation was increased in lesioned striatum. However, baicalein treatment reduced apomorphine-induced rotational behavior in 6-OHDA-lesioned mice, and increased TH immunoreactivity in the striatum and SN, and DA levels in lesioned striatum. Lipid peroxidation induced by 6-OHDA was also inhibited by baicalein treatment. Furthermore, when SH-SY5Y human neuroblastoma cells were treated with baicalein, 6-OHDA-induced cytotoxicity and reactive oxygen species (ROS) production were significantly reduced. These results indicate that baicalein effectively protects 6-OHDA-induced neuronal damage through antioxidant action.
