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Therapeutic Effects of Geranium Oil in MPTP-Induced Parkinsonian Mouse Model

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Abstract

Parkinson’s disease (PD) is an incurable neurodegenerative disease characterized by motor and non-motor disabilities resulting from neuronal cell death in the substantia nigra and striatum. Microglial activation and oxidative stress are two of the primary mechanisms driving that neuronal death. Here, we evaluated the effects of geranium oil on 1-methyl-4-phenyl-1,2,3,6-tetra-hydropyridine (MPTP) mouse model for PD, on microglial activation, and oxidative stress. We demonstrate that oral treatment with geranium oil improved motor performance in this model. The therapeutic effects of geranium oil were observed as a significant increase in rotarod latency and distance among the mice treated with geranium oil, as compared to vehicle-treated MPTP mice. Geranium oil also prevented dopaminergic neuron death in the substantia nigra of the treated mice. These therapeutic effects can be partially attributed to the antioxidant and anti-inflammatory properties of geranium oil, which were observed as attenuated accumulation of reactive oxygen species and inhibition of the secretion of proinflammatory cytokines from geranium oil-treated activated microglial cells. A repeated-dose oral toxicity study showed that geranium oil is not toxic to mice. In light of that finding and since geranium oil is defined by the FDA as generally recognized as safe (GRAS), we do not foresee any toxicity problems in the future and suggest that geranium oil may be a safe and effective oral treatment for PD. Since the MPTP model is only one of the preclinical models for PD, further studies are needed to confirm that geranium oil can be used to prevent or treat PD.

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Data Availability

Data will be made available upon request.

Abbreviations

ABAP:

2,2’-azobis(amidinopropane)

DAT:

Dopamine transporter

DCF-DA:

2’7’-dichlorofluorescein diacetate

IL-1β:

Interleukin 1β

IL-6:

Interleukin 6

GC-MS:

Gas chromatography-mass spectrometry

GRAS:

Generally recognized as safe

LPS:

Lipopolysaccharide

MCT:

Medium-chain triglyceride

MPTP:

1-methyl-4-phenyl-1,2,3,6-tetra-hydropyridine

MTT:

3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

MW:

Molecular weight

PD:

Parkinson’s disease

ROS:

Reactive oxygen species

SNc:

Substantia nigra zona compacta

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Funding

This work was supported by the Chief Scientist of the Ministry of Agriculture, Israel (grant No. 421-0135-09).

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Authors and Affiliations

Authors

Contributions

Anat Elmann: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing - original draft, Writing - review & editing. Alona Telerman: Formal analysis, Investigation. Nativ Dudai: Funding acquisition, Formal analysis, Supervision. Uzi Ravid: Funding acquisition, Formal analysis, Supervision.

Corresponding author

Correspondence to Anat Elmann.

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The authors declare no competing interests.

Ethics Approval

1. Preparation of primary cultures: The research was conducted in accordance with the US National Institute of Health (NIH) guidelines for the care and use of laboratory animals and was approved by the National Permit Committee for Animal Science (IL-135/07). 2. In vivo experiments: All animal experiments were carried out in accordance with the US National Institute of Health (NIH) Guidelines for the Care and Use of Laboratory Animals and were approved by the National Permit Committee for Animal Science (IL-10-12-111 and IL-12-12-223).

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Telerman, A., Ravid, U., Dudai, N. et al. Therapeutic Effects of Geranium Oil in MPTP-Induced Parkinsonian Mouse Model. Plant Foods Hum Nutr 78, 768–775 (2023). https://doi.org/10.1007/s11130-023-01112-3

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