title: In Vitro and in Vivo Neuroprotective Effects of Walnut (Juglandis Semen) in Models of Parkinson's Disease.
abstract: Monoamine oxidase (MAO) catalyzes the oxidative deamination of monoamines including dopamine (DA). MAO expression is elevated in Parkinson's disease (PD). An increase in MAO activity is closely related to age, and this may induce neuronal degeneration in the brain due to oxidative stress. MAO (and particularly monoamine oxidase B (MAO-B)) participates in the generation of reactive oxygen species (ROS), such as hydrogen peroxide that are toxic to dopaminergic cells and their surroundings. Although the polyphenol-rich aqueous walnut extract (JSE; an extract of Juglandis Semen) has been shown to have various beneficial bioactivities, no study has been dedicated to see if JSE is capable to protect dopaminergic neurons against neurotoxic insults in models of PD. In the present study we investigated the neuroprotective potential of JSE against 1-methyl-4-phenylpyridinium (MPP⁺)- or 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced neurotoxicities in primary mesencephalic cells and in a mouse model of PD. Here we show that JSE treatment suppressed ROS and nitric oxide productions triggered by MPP⁺ in primary mesencephalic cells. JSE also inhibited depletion of striatal DA and its metabolites in vivo that resulted in significant improvement in PD-like movement impairment. Altogether our results indicate that JSE has neuroprotective effects in PD models and may have potential for the prevention or treatment of PD.
authors.affiliation: Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. choijg2002@khu.ac.kr.
authors.forename: Jin Gyu
authors.initials: JG
authors.lastname: Choi
authors.affiliation: Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. uranos5@kiom.re.kr.
authors.forename: Gunhyuk
authors.initials: G
authors.lastname: Park
authors.affiliation: Department of Oriental Pharmaceutical Science, College of Pharmacy and Kyung Hee East-West Pharmaceutical Research Institute, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. kimhyogeun@khu.ac.kr.
authors.forename: Hyo Geun
authors.initials: HG
authors.lastname: Kim
authors.affiliation: Division for Medical Research, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon 34054, Korea. dsoh@kiom.re.kr.
authors.forename: Dal-Seok
authors.initials: DS
authors.lastname: Oh
authors.affiliation: Department of Herbal Pharmacology, College of Korean Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. hckim@khu.ac.kr.
authors.forename: Hocheol
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. msohok@khu.ac.kr.|Department of Oriental Pharmaceutical Science, College of Pharmacy and Kyung Hee East-West Pharmaceutical Research Institute, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Korea. msohok@khu.ac.kr.
authors.forename: Myung Sook
authors.initials: MS
authors.lastname: Oh
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use*; D002478:Cells, Cultured; D004298:Dopamine / Q000378:metabolism; D059290:Dopaminergic Neurons / Q000187:drug effects / Q000378:metabolism; D005260:Female; D031324:Juglans / Q000737:chemistry; D020267:MPTP Poisoning / Q000188:drug therapy*; D008297:Male; D008636:Mesencephalon / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D008995:Monoamine Oxidase / Q000378:metabolism; D018696:Neuroprotective Agents / Q000494:pharmacology / Q000627:therapeutic use*; D009569:Nitric Oxide / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology / Q000627:therapeutic use*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000975:Antioxidants; D018696:Neuroprotective Agents; D010936:Plant Extracts; D009569:Nitric Oxide; D008995:Monoamine Oxidase; D004298:Dopamine
keywords: Juglandis Semen; Parkinson’s disease; dopaminergic neuron; monoamine oxidase; neuroprotection; walnut