[Alzheimer disease and calcium]

Area of Science:

• Neuroscience
• Biochemistry
• Gerontology

Context:

• Calcium homeostasis is crucial for neuronal function.
• Disruptions in calcium regulation are implicated in neurodegenerative diseases like Alzheimer's.
• Aging and chronic renal failure can exacerbate calcium-related neurological issues.

Purpose:

• To explore the role of calcium dysregulation in neuronal dysfunction and Alzheimer's disease.
• To investigate the mechanisms linking intracellular calcium increase to amyloid beta production and oxidative stress.
• To evaluate the potential of calcium and vitamin D supplementation in Alzheimer's disease prevention and treatment.

Summary:

• Elevated intracellular free calcium (Ca i) in nerve cells is linked to neuronal dysfunction and cell death, observed in conditions such as dialysis encephalopathy and Alzheimer's disease.
• Increased Ca i in Alzheimer's disease facilitates presenilin mutation, augmenting amyloid beta production, which in turn promotes peroxide radical generation and lipid peroxidation, further damaging cell membranes and increasing Ca i.
• The neurotoxic effects of apolipoprotein E(4) and the protective role of estrogen in Alzheimer's disease may be mediated by lipid peroxidation and calcium levels, suggesting therapeutic potential for calcium and vitamin D.

Impact:

• Understanding the intricate relationship between calcium, amyloid beta, and oxidative stress provides new insights into Alzheimer's pathogenesis.
• This research highlights the potential of calcium and vitamin D supplementation as a preventative or therapeutic strategy for Alzheimer's disease.
• The findings suggest a novel approach to managing neurodegenerative conditions by targeting calcium homeostasis.