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Amelioration of oxidative stress and neuroinflammation in lipopolysaccharide-induced memory impairment using Rosmarinic acid in mice

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Abstract

Oxidative stress plays a pivotal part in the manifestation of neuroinflammation, which further leads to neurodegenerative diseases like Alzheimer’s disease (AD). Systemic administration of lipopolysaccharide (LPS) induces neuroinflammation resulting in memory impairment (MI) and cognitive decline. In this study, we evaluated whether prophylactic administration of Rosmarinic acid (RA), a naturally occurring compound, exerts a neuroprotective effect in LPS-induced MI and cognitive decline. Herein, Swiss albino mice were pre-treated with RA (0.5 mg/kg and 1 mg/kg i.p.) for 28 days and were intermittently exposed to LPS (0.25 mg/kg i.p.) for 7 days. LPS caused poor memory retention and increased cognitive decline in Morris water maze (MWM) and Y maze paradigms respectively. Additionally, LPS increased oxidative stress which was denoted by a decrease in superoxide dismutase (SOD) activity, decrease in reduced glutathione (GSH) levels, and increased lipid peroxidation in the brain. Imbalance in the cholinergic system was analyzed by measuring the acetylcholinesterase (AChE) activity. Pre-treatment with RA improved memory and behavioral disturbances by alleviating oxidative stress and AChE activity. LPS augmented levels of tumor necrosis factor (TNF-α), interleukin (IL)-6, caspase-3, and c-Jun. Pre-treatment with RA revitalized the elevated levels of proinflammatory cytokines and apoptotic proteins. In conclusion, this study showcases the amelioration of MI by RA in LPS-challenged memory and cognitive decline, which could be credited to its anti-oxidant effect, inhibitory effect on both proinflammatory cytokines and apoptotic regulators, and reduction in AChE activity.

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Abbreviations

AChE:

Acetylcholinesterase

AcSCh:

Acetyl thio-choline iodide

AD:

Alzheimer’s disease

ANOVA:

Analysis of variance

DTNB:

5, 5’- dithiobis (2- nitrobenzoic acid)

IL:

Interleukin

IAEC:

Institutional Animal Ethics Committee

JNK:

c-Jun N-terminal kinase (JNK)

LPO:

Lipid peroxidation

LPS:

Lipopolysaccharide

MI:

Memory impairment

MWM:

Morris water maze test

NFTs:

Neurofibrillary tangles

NSAIDs:

Non-steroidal anti-inflammatory drugs

Nrf2:

Nuclear factor erythroid 2-related factor 2

NIBS:

National Institute of Biosciences

PBS:

Phosphate buffer saline

ROS:

Reactive oxygen species

GSH:

Reduced glutathione

RVS:

Rivastigmine

RA:

Rosmarinic acid

SOD:

Superoxide dismutase

SAB:

Spontaneous alteration behaviours

TBA:

Thiobarbituric acid

TBARS:

Thiobarbituric acid reactive substances

TCA:

Trichloroacetic acid

TNF:

Tumor necrotic factor

WHO:

World Health Organization

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Acknowledgements

This study has been funded by All India Council of Technical Education (AICTE), India.

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Correspondence to Archana Juvekar.

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The authors declare no conflict of interest.

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Thingore, C., Kshirsagar, V. & Juvekar, A. Amelioration of oxidative stress and neuroinflammation in lipopolysaccharide-induced memory impairment using Rosmarinic acid in mice. Metab Brain Dis 36, 299–313 (2021). https://doi.org/10.1007/s11011-020-00629-9

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  • DOI: https://doi.org/10.1007/s11011-020-00629-9

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