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CNS & Neurological Disorders - Drug Targets

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ISSN (Print): 1871-5273
ISSN (Online): 1996-3181

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Review Article

Signalling Pathways Involved in Microglial Activation in Alzheimer’s Disease and Potential Neuroprotective Role of Phytoconstituents

Author(s): Mohd Uzair Ali, Laiba Anwar, Mohd Humair Ali, Mohammad Kashif Iqubal, Ashif Iqubal*, Sanjula Baboota and Javed Ali*

Volume 23, Issue 7, 2024

Published on: 13 January, 2023

Page: [819 - 840] Pages: 22

DOI: 10.2174/1871527322666221223091529

Price: $65

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Abstract

Alzheimer’s disease (AD) is a commonly reported neurodegenerative disorder associated with dementia and cognitive impairment. The pathophysiology of AD comprises Aβ, hyperphosphorylated tau protein formation, abrupt cholinergic cascade, oxidative stress, neuronal apoptosis, and neuroinflammation. Recent findings have established the profound role of immunological dysfunction and microglial activation in the pathogenesis of AD. Microglial activation is a multifactorial cascade encompassing various signalling molecules and pathways such as Nrf2/NLRP3/NF-kB/p38 MAPKs/ GSK-3β. Additionally, deposited Aβ or tau protein triggers microglial activation and accelerates its pathogenesis. Currently, the FDA-approved therapeutic regimens are based on the modulation of the cholinergic system, and recently, one more drug, aducanumab, has been approved by the FDA. On the one hand, these drugs only offer symptomatic relief and not a cure for AD. Additionally, no targetedbased microglial medicines are available for treating and managing AD. On the other hand, various natural products have been explored for the possible anti-Alzheimer effect via targeting microglial activation or different targets of microglial activation. Therefore, the present review focuses on exploring the mechanism and associated signalling related to microglial activation and a detailed description of various natural products that have previously been reported with anti-Alzheimer’s effect via mitigation of microglial activation. Additionally, we have discussed the various patents and clinical trials related to managing and treating AD.

Keywords: Microglial activation, neuroinflammation, dementia, amyloid beta, toll-like receptors, immunopathology, natural products.

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