Quercetin and sesamin protect dopaminergic cells from MPP+-induced neuroinflammation in a microglial (N9)-neuronal (PC12) coculture system.
A growing body of evidence indicates that the majority of Parkinson's disease (PD) cases are associated with microglia activation with resultant elevation of various inflammatory mediators and neuroinflammation. In this study, we investigated the effects of 2 natural molecules, quercetin and sesamin, on neuroinflammation induced by the Parkinsonian toxin 1-methyl-4-phenylpyridinium (MPP(+)) in a glial-neuronal system. We first established that quercetin and sesamin defend microglial cells against MPP(+)-induced increases in the mRNA or protein levels of 3 pro-inflammatory cytokines (interleukin-6, IL-1β and tumor necrosis factor-alpha), as revealed by real time-quantitative polymerase chain reaction and enzyme-linked immunoabsorbent assay, respectively. Quercetin and sesamin also decrease MPP(+)-induced oxidative stress in microglial cells by reducing inducible nitric oxide synthase protein expression as well as mitochondrial superoxide radicals. We then measured neuronal cell death and apoptosis after MPP(+) activation of microglia, in a microglial (N9)-neuronal (PC12) coculture system. Our results revealed that quercetin and sesamin rescued neuronal PC12 cells from apoptotic death induced by MPP(+) activation of microglial cells. Altogether, our data demonstrate that the phytoestrogen quercetin and the lignan sesamin diminish MPP(+)-evoked microglial activation and suggest that both these molecules may be regarded as potent, natural, anti-inflammatory compounds.
Department of Biochemistry, Université du Québec, Trois-Rivières, Québec, Canada.
Julie
J
Bournival
Marilyn
M
Plouffe
Justine
J
Renaud
Cindy
C
Provencher
Maria-Grazia
MG
Martinoli
D015655:1-Methyl-4-phenylpyridinium / Q000633:toxicity; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D018920:Coculture Techniques; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D019610:Cytoprotection / Q000187:drug effects*; D004149:Dioxoles / Q000494:pharmacology*; D059290:Dopaminergic Neurons / Q000187:drug effects / Q000378:metabolism / Q000473:pathology*; D005786:Gene Expression Regulation / Q000187:drug effects; D007249:Inflammation / Q000473:pathology*; D007700:Kinetics; D017705:Lignans / Q000494:pharmacology*; D051379:Mice; D017628:Microglia / Q000187:drug effects / Q000201:enzymology / Q000473:pathology*; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D009474:Neurons / Q000187:drug effects / Q000201:enzymology / Q000473:pathology*; D018696:Neuroprotective Agents / Q000494:pharmacology; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D016716:PC12 Cells; D011794:Quercetin / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D013481:Superoxides / Q000378:metabolism
D016207:Cytokines; D004149:Dioxoles; D017705:Lignans; D018696:Neuroprotective Agents; D012333:RNA, Messenger; D013481:Superoxides; D011794:Quercetin; D052247:Nitric Oxide Synthase Type II; D015655:1-Methyl-4-phenylpyridinium; C054125:sesamin