Calcium-regulated signaling pathways: role in amyloid beta-induced synaptic dysfunction
1Department of Psychiatry and Biobehavioral Sciences, Neuropsychiatric Institute, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA 90095-1761, USA. cxie@mednet.ucla.edu
Amyloid beta peptides disrupt synaptic plasticity in Alzheimer's disease (AD) models by altering calcium signaling. These disruptions in calcium-regulated pathways contribute to early synaptic dysfunction in AD.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Amyloid beta (Abeta) peptides are implicated in Alzheimer's disease (AD) pathogenesis.
- Synaptic dysfunction, particularly impaired long-term potentiation (LTP), is an early feature of AD.
Purpose of the Study:
- To investigate the role of Abeta peptides in synaptic dysfunction.
- To elucidate the mechanisms of Abeta-induced alterations in calcium (Ca2+) signaling and downstream pathways.
Main Methods:
- Studies in transgenic mouse models of AD and acute hippocampal preparations.
- Analysis of Abeta's effects on intracellular Ca2+ concentrations.
- Investigation of Abeta's impact on Ca2+-regulated protein kinase and phosphatase pathways.
Main Results:
- Abeta peptides impair hippocampal LTP in AD models.
- Abeta alters neuronal Ca2+ signaling by modulating Ca2+ influx and release.
- Abeta affects key Ca2+-regulated signaling pathways, including protein kinases and calcineurin.
Conclusions:
- Abeta-induced synaptic dysfunction in early AD is mediated by dysregulated Ca2+ signaling.
- Malfunction of multiple Ca2+-regulated pathways contributes to synaptic deficits in AD.
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