Amyloid β Oligomers Increase ER-Mitochondria Ca2+ Cross Talk in Young Hippocampal Neurons and Exacerbate Aging-Induced Intracellular Ca2+ Remodeling

Frontiers in Cellular Neuroscience
María Calvo-RodríguezCarlos Villalobos

Abstract

Alzheimer's disease (AD) is the most common neurodegenerative disorder and strongly associated to aging. AD has been related to excess of neurotoxic oligomers of amyloid β peptide (Aβo), loss of intracellular Ca2+ homeostasis and mitochondrial damage. However, the intimate mechanisms underlying the pathology remain obscure. We have reported recently that long-term cultures of rat hippocampal neurons resembling aging neurons are prone to damage induced by Aβ oligomers (Aβo) while short-term cultured cells resembling young neurons are not. In addition, we have also shown that aging neurons display critical changes in intracellular Ca2+ homeostasis including increased Ca2+ store content and Ca2+ transfer from the endoplasmic reticulum (ER) to mitochondria. Aging also promotes the partial loss of store-operated Ca2+ entry (SOCE), a Ca2+ entry pathway involved in memory storage. Here, we have addressed whether Aβo treatment influences differentially intracellular Ca2+ homeostasis in young and aged neurons. We found that Aβo exacerbate the remodeling of intracellular Ca2+ induced by aging. Specifically, Aβo exacerbate the loss of SOCE observed in aged neurons. Aβo also exacerbate the increased resting cytosolic Ca2+ concentration, Ca...Continue Reading

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Methods Mentioned

BETA
transgenic
fluorescence microscopy
fluorescence imaging

Software Mentioned

LAS AF Lite
ImageJ
Origin Lab

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