Curcumin Mechanisms in Alzheimer's Disease Management

Curcumin, the principal polyphenol of the spice turmeric, exerts multifaceted actions against key pathological features of Alzheimer's disease. Its planar phenolic structure enables direct binding to amyloid-β (Aβ) species, inhibiting oligomerisation and fibril formation while promoting disaggregation of existing plaques. Alongside anti-amyloidogenic actions, curcumin displays potent antioxidant activity by scavenging reactive oxygen species and upregulating endogenous antioxidant programmes. It modulates neuroinflammatory cascades through suppression of NF-κB signalling and activation of peroxisome proliferator-activated receptor gamma (PPARγ), thereby reducing microglial and astrocytic activation. Curcumin further influences amyloid precursor protein (APP) processing, attenuating its maturation in the secretory pathway to lower Aβ production. Evidence also points to enhancement of neurotrophic support via upregulation of brain-derived neurotrophic factor and downstream ERK signalling, as well as promotion of neurogenesis and synaptic plasticity. Despite promising preclinical data, clinical translation has been hampered by low oral bioavailability and rapid metabolism; current efforts focus on novel formulations and analogues to overcome these limitations. Collectively, curcumin represents a multitargeted approach with potential for disease modification and symptomatic improvement in Alzheimer's disease.

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Curcumin Mechanisms in Alzheimer's Disease Management publication trend

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Technical terms

Amyloid beta (Aβ) oligomers: Soluble aggregates of Aβ peptides implicated in synaptic dysfunction and early neurotoxicity.

Amyloid fibrils: Insoluble, β-sheet–rich assemblies of Aβ that deposit extracellularly as senile plaques.

Amyloid precursor protein (APP): Transmembrane protein cleaved by secretases to generate Aβ peptides.

Peroxisome proliferator-activated receptor gamma (PPARγ): Nuclear receptor regulating genes involved in inflammation and metabolism.

Neuroinflammation: Immune response within the central nervous system characterised by glial activation and cytokine release.

Bioavailability: Proportion of administered compound that reaches systemic circulation and target tissues.

Blood–brain barrier (BBB): Selective endothelial interface controlling molecular passage between blood and brain.

References

1. Curcumin Inhibits Formation of Amyloid β Oligomers and Fibrils, Binds Plaques, and Reduces Amyloid in Vivo *. Journal of Biological Chemistry (2004).
2. Curcumin Decreases Amyloid-β Peptide Levels by Attenuating the Maturation of Amyloid-β Precursor Protein*. Journal of Biological Chemistry (2010).
3. The Curry Spice Curcumin Reduces Oxidative Damage and Amyloid Pathology in an Alzheimer Transgenic Mouse. Journal of Neuroscience (2001).
4. Curcumin Attenuates Beta-Amyloid-Induced Neuroinflammation via Activation of Peroxisome Proliferator-Activated Receptor-Gamma Function in a Rat Model of Alzheimer's Disease. Frontiers in Pharmacology (2016).
5. Curcumin Improves Amyloid β-Peptide (1-42) Induced Spatial Memory Deficits through BDNF-ERK Signaling Pathway. PLOS ONE (2015).
6. Curcumin Enhances Neurogenesis and Cognition in Aged Rats: Implications for Transcriptional Interactions Related to Growth and Synaptic Plasticity. PLOS ONE (2012).
7. Synergistic Effects of Curcumin and Piperine as Potent Acetylcholine and Amyloidogenic Inhibitors With Significant Neuroprotective Activity in SH-SY5Y Cells via Computational Molecular Modeling and in vitro Assay. Frontiers in Aging Neuroscience (2019).
8. Curcumin in Health and Diseases: Alzheimer’s Disease and Curcumin Analogues, Derivatives, and Hybrids. International Journal of Molecular Sciences (2020).