Abstract
Alzheimer's disease (AD) is a multifactorial neurological disorder associated with neuropathological and neurobehavioral changes, like cognition and memory loss. Pathological hallmarks of AD comprise oxidative stress, formation of insoluble β-amyloid (Aβ) plaques, intracellular neurofibrillary tangles constituted by hyperphosphorylated tau protein (P-tau), neurotransmitters dysbalanced (DA, NE, 5-HT, GABA and Glutamate) and metal deposition. Chronic exposure to metals like aluminium and copper causes accumulation of Aβ plaques, promotes oxidative stress, neuro-inflammation, and degeneration of cholinergic neurons results in AD-like symptoms. In the present study, rats were administered with aluminium chloride (200 mg/kg p.o) and copper sulfate (0.5 mg/kg p.o) alone and in combination for 28 days. Allicin (10 and 20 mg/kg i.p) was administered from day 7 to day 28. Spatial and recognition memory impairment analysis was performed using Morris water maze, Probe trial, and Novel Object Recognition test. Animals were sacrificed on day 29, brain tissue was isolated, and its homogenate was used for biochemical (lipid peroxidation, nitrite, and glutathione), neuro-inflammatory (IL-1β, IL-6 and TNF- α), neurotransmitters (DA, NE, 5-HT, GABA and Glutamate), Aβ(1–42) level, Al concentration estimation, and Na+/K+-ATPase activity. In the present study, aluminium chloride and copper sulfate administration increased oxidative stress, inflammatory cytokines release, imbalanced neurotransmitters’ concentration, and promoted β-amyloid accumulation and Na+/K+-ATPase activity. Treatment with allicin dose-dependently attenuated these pathological events via restoration of antioxidants, neurotransmitters concentration, and inhibiting cytokine release and β-amyloid accumulation. Moreover, allicin exhibited the neuroprotective effect through antioxidant, anti-inflammatory, neurotransmitters restoration, attenuation of neuro-inflammation and β-amyloid-induced neurotoxicity.
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Abbreviations
- AD:
-
Alzheimer’s disease
- NORT:
-
Novel object recognition test
- IL:
-
Interleukin
- TNF-α:
-
Tumor necrosis factor-alpha
- LPO:
-
Lipid peroxidation
- GR:
-
Glutathione reductase
- OPA:
-
O-phthalaldehyde
- MDA:
-
Malondialdehyde
- DA:
-
Dopamine
- NE:
-
Norepinephrine
- AChE:
-
Acetylcholinesterase
- 5-HT:
-
5-Hydroxytryptamine
- GABA:
-
Gamma-aminobutyric acid
- SP:
-
Senile plaques
- NFTs:
-
Neurofibrillary tangles
- Aβ:
-
Amyloid-β peptide
- BBB:
-
Blood–brain barrier
- CNS:
-
Central nervous system
- AGE:
-
Aged garlic extract
- AlCl3 :
-
Aluminium chloride
- CuSO4 :
-
Copper sulfate
- Ach:
-
Acetylcholine
- CPCSEA:
-
Committee for the purpose of control and supervision of experiments on animals
- MWM:
-
Morris water maze
- ELISA:
-
Enzyme-linked immunosorbent assay
- HPLC:
-
High-performance liquid chromatography
- ECD:
-
Electrochemical detection
- AAS:
-
Atomic absorption spectrophotometer
- EDTA:
-
Ethylene diamine-tetra-acetic acid
- RNS:
-
Reactive nitrogen species
- THB:
-
Tetrahydrobiopterin
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Acknowledgements
All authors are thankful to Shri Praveen Garg, chairman ISF College of Pharmacy, Moga, Punjab for providing research platform.
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SK: Conducted the experiment and writing the manuscript. KR: Collected data and analyzed by taking the help of Dr. SS. Dr. SS and YKG: Designed, reviewing, and editing.
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The experimental protocol was reviewed and approved by the Institutional Animal Ethics Committee (ISFCP/IAEC/CPCSEA/Meeting No. 2018/352) and experiments were conducted in compliance with the guidelines of the Indian National Science Academy (INSA) for the use and care of experimental animals.
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Kaur, S., Raj, K., Gupta, Y.K. et al. Allicin ameliorates aluminium- and copper-induced cognitive dysfunction in Wistar rats: relevance to neuro-inflammation, neurotransmitters and Aβ(1–42) analysis. J Biol Inorg Chem 26, 495–510 (2021). https://doi.org/10.1007/s00775-021-01866-8
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DOI: https://doi.org/10.1007/s00775-021-01866-8