Effect of citronellol on oxidative stress, neuroinflammation and autophagy pathways in an
Apoptosis
Citronellol
Dopaminergic neurons
Neuroprotection
Rotenone
Journal
Heliyon
ISSN: 2405-8440
Titre abrégé: Heliyon
Pays: England
ID NLM: 101672560
Informations de publication
Date de publication:
Nov 2022
Nov 2022
Historique:
received:
27
10
2021
revised:
23
02
2022
accepted:
31
10
2022
entrez:
17
11
2022
pubmed:
18
11
2022
medline:
18
11
2022
Statut:
epublish
Résumé
Citronellol, a monoterpene found in the essential oils of Cymbopogo plants has been reported to possess various biological properties. In the present study, we investigated the neuroprotective mechanisms of citronellol against rotenone induced neurodegeneration by using rat model of Parkinson's disease (PD). Our results demonstrated that oral administration of citronellol prevented rotenone induced reactive oxygen species production, lipid peroxidation and enhanced Nrf2 expression, catalase, glutathione peroxidase and superoxide dismutase levels in the brain. Enzyme-linked immunosorbent assays showed that citronellol reduced secretion of TNF-α, IL-1β, IL-6 and decreased MMP-9 expression levels. Further, citronellol prevented rotenone induced microglia (Iba-1 staining) and astrocyte (GFAP staining) activation. Western blot analysis showed that citronellol significantly decreased the expression of cyclooxygenase-2 and inducible nitric oxide synthase-2 that are key markers of neuroinflammation. We further evaluated the effect of citronellol on dopaminergic neurons in substantia nigra pars compacta (SNpc) and striatum (ST) which are key anatomical structures in PD. Tyrosine hydroxylase (TH) immunoreactivity showed that citronellol preserved Tyrosine hydroxylase (TH) positive dopaminergic neurons and enhanced TH striatal expression levels significantly compared to rotenone alone group. Further, to understand the effect of citronellol on apoptosis and proteotoxicity, we evaluated apoptotic markers (Bax, Bcl-2), growth regulator (mTOR) and α-synuclein expression. Citronellol attenuated rotenone induced expression of pro-apoptotic protein Bax, reduced α-synuclein expression and enhanced Bcl-2 and mTOR levels. In addition, citronellol modulated autophagy pathway by decreasing LC-3 (Microtubule-associated proteins) and p62 levels. Taken together, our results demonstrate that citronellol protected dopaminergic neurons through its antioxidant, anti-inflammatory, anti-apoptotic and autophagy modulating properties.
Identifiants
pubmed: 36387498
doi: 10.1016/j.heliyon.2022.e11434
pii: S2405-8440(22)02722-0
pmc: PMC9663872
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e11434Informations de copyright
© 2022 The Author(s).
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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