Metal ion homeostasis is a critical pathological mechanism in Alzheimer's disease (AD), where dysregulation of transition metals contributes to amyloid-beta (Aβ) aggregation, oxidative stress, and neuronal death[@tao2024][@williams2024].
Overview
Transition metals are essential for normal brain function:
Copper: Enzyme cofactor for cytochrome c oxidase, SOD, dopamine β-hydroxylase
Zinc: Synaptic signaling, enzyme cofactor, DNA binding
In AD, metal homeostasis is disrupted, leading to[@squitti2011][@milller2024][@squitti2005][@atwood1998][@bush1994][@loeffler1995][@lee2009][@bush2024][@huang1997][@zhang2008][@lyubartseva2010][@zhang2024][@kumar2024][@markesbery1997][@smith2000][@butterfield2001][@pratic2008][@faller2009][@rauk2009][@huang1999][@bush2003][@yoshiike2001][@rasi2025][@laferla2002][@stutzmann2005][@cali2010][@bezprozvanny2008][@okonkwo2025][@liu2024][@crapper1991][@lannfelt2008][@mecocci2012][@mandel2008][@conner1992][@smith1997][@zheng2012][@honda2004]:
Accumulation in amyloid plaques
Increased oxidative stress
Altered amyloid processing
Synaptic dysfunction
Key Mechanisms
1. Iron Accumulation in AD Brain
Iron is the most abundant metal in the brain[@tao2024][@williams2024][@conner1992][@smith1997][@zheng2012][@honda2004]:
...
Metal Ion Homeostasis in Alzheimer's Disease
Introduction
Metal ion homeostasis is a critical pathological mechanism in Alzheimer's disease (AD), where dysregulation of transition metals contributes to amyloid-beta (Aβ) aggregation, oxidative stress, and neuronal death[@tao2024][@williams2024].
Overview
Transition metals are essential for normal brain function:
Copper: Enzyme cofactor for cytochrome c oxidase, SOD, dopamine β-hydroxylase
Zinc: Synaptic signaling, enzyme cofactor, DNA binding
In AD, metal homeostasis is disrupted, leading to[@squitti2011][@milller2024][@squitti2005][@atwood1998][@bush1994][@loeffler1995][@lee2009][@bush2024][@huang1997][@zhang2008][@lyubartseva2010][@zhang2024][@kumar2024][@markesbery1997][@smith2000][@butterfield2001][@pratic2008][@faller2009][@rauk2009][@huang1999][@bush2003][@yoshiike2001][@rasi2025][@laferla2002][@stutzmann2005][@cali2010][@bezprozvanny2008][@okonkwo2025][@liu2024][@crapper1991][@lannfelt2008][@mecocci2012][@mandel2008][@conner1992][@smith1997][@zheng2012][@honda2004]:
Accumulation in amyloid plaques
Increased oxidative stress
Altered amyloid processing
Synaptic dysfunction
Key Mechanisms
1. Iron Accumulation in AD Brain
Iron is the most abundant metal in the brain[@tao2024][@williams2024][@conner1992][@smith1997][@zheng2012][@honda2004]:
Ferritin levels increase in AD neurons
Iron accumulates in amyloid plaques
DMT1 (Divalent Metal Transporter 1) expression is altered
Contributes to oxidative damage through Fenton chemistry
2. Copper Dysregulation
Copper plays roles in multiple enzymatic reactions[@squitti2011][@milller2024][@squitti2005][@atwood1998][@bush1994][@loeffler1995]:
Ceruloplasmin levels are altered in AD
Aβ binds copper with high affinity
Copper accelerates Aβ aggregation
Cytochrome c oxidase activity decreases
3. Zinc Homeostasis Disruption
Zinc is crucial for synaptic transmission[@lee2009][@bush2024][@huang1997][@zhang2008][@lyubartseva2010]:
Natural chelators: Green tea polyphenols[@mandel2008]
Summary
Metal ion dysregulation is both a cause and consequence of AD pathogenesis. Metal-Aβ interactions promote aggregation, while metal-induced oxidative stress accelerates neuronal damage. Restoring metal homeostasis remains a therapeutic challenge but offers disease-modifying potential.
See Also
[Oxidative Stress in Neurodegeneration](/mechanisms/oxidative-stress)