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Neuroprotective mechanism of trans,trans-Farnesol in an ICV-STZ-induced rat model of Alzheimer’s pathology

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Abstract

Background

Alzheimer’s disease (AD) is a prominent cause of dementia, resulting in neurodegeneration and memory impairment. This condition imposes a considerable public health burden on both patients and their families due to the patients’ functional impairments as well as the psychological and financial constraints. It has been well demonstrated that its aetiology involves proteinopathy, mitochondriopathies, and enhanced reactive oxygen species (ROS) generation, which are some of the key features of AD brains that further result in oxidative stress, excitotoxicity, autophagy, and mitochondrial dysfunction.

Objective

The current investigation was created with the aim of elucidating the neurological defence mechanism of trans,trans-Farnesol (TF) against intracerebroventricular-streptozotocin (ICV-STZ)-induced Alzheimer-like symptoms and related pathologies in rodents.

Materials and methods

The current investigation involved male SD rats receiving TF (25–100 mg/kg, per oral) consecutively for 21 days in ICV-STZ-treated animals. An in silico study was carried out to explore the possible interaction between TF and NADH dehydrogenase and succinate dehydrogenase. Further, various behavioural (Morris water maze and novel object recognition test), biochemical (oxidants and anti-oxidant markers), activities of mitochondrial enzyme complexes and acetylcholinesterase (AChE), pro-inflammatory (tumor necrosis factor-alpha; TNF-α) levels, and histopathological studies were evaluated in specific brain regions.

Results

Rats administered ICV-STZ followed by treatment with TF (25, 50, and 100 mg/kg) for 21 days had significantly better mental performance (reduced escape latency to access platform, extended time spent in target quadrant, and improved differential index) in the Morris water maze test and new object recognition test models when compared to control (ICV-STZ)-treated groups. Further, TF treatment significantly restored redox proportion, anti-oxidant levels, regained mitochondrial capacities, attenuated altered AChE action, levels of TNF-α, and histopathological alterations in certain brain regions in comparison with control. In in silico analysis, TF caused greater interaction with NADH dehydrogenase and succinate dehydrogenase.

Conclusion

The current work demonstrates the neuroprotective ability of TF in an experimental model with AD-like pathologies. The study further suggests that the neuroprotective impacts of TF may be related to its effects on TNF-α levels, oxidative stress pathways, and mitochondrial complex capabilities.

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Data availability

Data will be made available on request.

Abbreviations

5XTC:

Cryo-EM structure of human respiratory complex I transmembrane arm

4YTP:

Crystal structure of porcine heart mitochondrial complex II bound with N-[(4-tert-butylphenyl)methyl]-2-(trifluoromethyl)benzamide

AChE:

Acetylcholinesterase

ACSF:

Artificial cerebrospinal fluid

AD:

Alzheimer’s disease

ANOVA:

Analysis of variance

APP:

Amyloid-protein precursor

ATP:

Adenosine triphosphate

BSA:

Bovine serum albumin

Bw:

Body weight

CPCSEA:

Committee for purpose of control and supervision of experiments on animals

DCFH-DA:

2′, 7′ -Dichlorofluorescin diacetate

DG:

Dentate gyrus

DPX:

Distrene plasticizer xylene

EGTA:

Ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid

ELISA:

Enzyme-linked immunosorbent assay

ETC:

Electron transport chain

FAD:

Familial Alzheimer’s disease

Gala:

Galantamine

GSH:

Reduced glutathione

H2O2:

Hydrogen peroxide

HEPES:

(4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid)

IAEC:

Institutional Animal Ethics Committee

ICV-STZ:

Intracerebroventricular-streptozotocin

IL-6:

Interleukin-6

KOH:

Potassium hydroxide solution

LPO:

Lipid peroxidation

MDA:

Malondialdehyde

mtDNA:

Mitochondrial DNA

MTT:

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl-H-tetrazolium bromide

MWM:

Morris water maze

NADH:

Nicotinamide adenine dinucleotide

NOR or NORT:

Novel object recognition test

OH•:

Hydroxyl radicals

ONOO :

Peroxynitrite

OXPHOS:

Oxidative phosphorylation

PLIP:

Protein–Ligand Interaction Profiler

PMS:

Post mitochondrial supernatant

PNS:

Post nuclear supernatant

PS 1 or 2:

Presenilin 1 or 2

RNS:

Reactive nitrogen species

ROS:

Reactive oxygen species

SAD:

Sporadic Alzheimer’s disease

SD:

Sprague–Dawley

SDH:

Succinate dehydrogenase

SEM:

Standard error of the mean

SOD:

Superoxide dismutase

TBA:

Thiobarbituric acid

TBARS:

Thiobarbituric-acid reactive substance

TF:

Trans,trans-Farnesol

TNF-α:

Tumor necrosis factor- alpha

TSTQ:

Time spent in target quadrant

UV–Vis:

Ultraviolet–visible

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Acknowledgements

We sincerely appreciate the help provided by the ICMR-SRF and RA grants (No. 45/35/2018-PHA/BMS and 3/1/3/5/M/2022-NCD-II) from the Indian Council of Medical Research (ICMR), New Delhi, India.

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Authors

Contributions

MK: design and creation of the research; planning, and executing behavioral investigations; carrying out the surgery; assessing the outcomes; performing outcomes analysis; and writing the manuscript. NS: executing experiments (ROS and protein carbonyls estimation), evaluating the results, statistical analysis. AK: carrying out experiments (ROS, protein carbonyls and TNF-alpha estimation), evaluating the results. AK: design and creation of the research; creating and directing all of the experiments; evaluating and analysing the results; writing, reviewing, and editing the manuscript.

Corresponding author

Correspondence to Anil Kumar.

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Kadian, M., Saini, N., Khera, A. et al. Neuroprotective mechanism of trans,trans-Farnesol in an ICV-STZ-induced rat model of Alzheimer’s pathology. Inflammopharmacol 32, 1545–1573 (2024). https://doi.org/10.1007/s10787-023-01413-8

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  • DOI: https://doi.org/10.1007/s10787-023-01413-8

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