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Intracellular mechanisms underlying aluminum-induced apoptosis in rabbit brain
John Savory1, Mary M Herman, Othman Ghribi
1Department of Pathology, University of Virginia, Charlottesville, VA, USA. jsr2@virginia.edu
Abstract:
Loss of neurons is a hallmark of neurodegenerative disorders and there is increasing evidence suggesting that apoptosis is a key mechanism by which neurons die in these diseases. Mitochondrial dysfunction has been implicated in this process of neuronal cell death, but there is a growing body of evidence suggesting also an active role for the endoplasmic reticulum in regulating apoptosis, either independent of mitochondria, or in concert with mitochondrial-initiated pathways. Investigations in our laboratory have focused on neuronal injury resulting from the administration of aluminum maltolate, via the intracisternal route, to New Zealand white rabbits. This treatment induces both mitochondrial and endoplasmic reticulum stress. Agents such as lithium or glial cell-line derived neurotrophic factor (GDNF) have the ability to prevent aluminum-induced neuronal death by interfering with the mitochondrial and/or the endoplasmic reticulum-mediated apoptosis cascade. Cytochrome c release from mitochondria and binding to Apaf-1 initiates the aluminum-induced apoptosis cascade; this is prevented by lithium treatment. GDNF also protects against aluminum-induced apoptosis but by upregulation of Bcl-X(L), thereby preventing the binding of cytochrome c to Apaf-1. This animal model system involving neurotoxicity induced by an aluminum compound provides new information on mechanisms of neurodegeneration and neuroprotection.
Insights
Aluminum maltolate induces neurodegeneration via apoptosis, affecting mitochondria and endoplasmic reticulum. Lithium and GDNF protect neurons by modulating these pathways, offering insights into neuroprotection strategies for neurodegenerative disorders.
Area of Science:
- Neuroscience
- Cell Biology
- Toxicology
Background:
- Neuronal loss is central to neurodegenerative disorders, with apoptosis as a key cell death mechanism.
- Both mitochondrial dysfunction and endoplasmic reticulum stress are implicated in neuronal apoptosis.
- Aluminum compounds can induce neurotoxicity, highlighting the need to understand underlying mechanisms.
Purpose of the Study:
- To investigate the roles of mitochondria and endoplasmic reticulum in aluminum-induced neuronal apoptosis.
- To explore the neuroprotective effects of lithium and glial cell-derived neurotrophic factor (GDNF) in an aluminum neurotoxicity model.
- To elucidate the specific molecular pathways targeted by these neuroprotective agents.
Main Methods:
- Induction of neurotoxicity in New Zealand white rabbits via intracisternal administration of aluminum maltolate.
- Assessment of mitochondrial and endoplasmic reticulum stress markers following aluminum treatment.
- Evaluation of the protective effects of lithium and GDNF on neuronal survival.
- Analysis of apoptosis-related proteins, including cytochrome c, Apaf-1, and Bcl-X(L).
Main Results:
- Aluminum maltolate administration induced significant mitochondrial and endoplasmic reticulum stress, leading to neuronal death.
- Lithium treatment prevented aluminum-induced apoptosis by inhibiting cytochrome c release and Apaf-1 binding.
- GDNF protected neurons by upregulating Bcl-X(L), which prevented cytochrome c-Apaf-1 interaction.
- The study established a rabbit model for studying aluminum-induced neurodegeneration and neuroprotection.
Conclusions:
- Aluminum-induced neurotoxicity involves both mitochondrial and endoplasmic reticulum-mediated apoptosis.
- Lithium and GDNF offer neuroprotection through distinct but effective modulation of apoptotic pathways.
- This research provides valuable insights into the mechanisms of neurodegeneration and potential therapeutic strategies.
