Related Experiment Video
Updated: Jun 14, 2025
08:16
Stereotaxic Infusion of Oligomeric Amyloid-beta into the Mouse Hippocampus
Published on: June 17, 2015
18.1K
Polyunsaturated fatty acids in lipid membranes regulate human neuronal function and amyloid-β production
Satoshi Morita1,2,3, Takayuki Kondo1,3,4, Hisanori Tokuda2
1iPSC-based Drug Discovery and Development Team, RIKEN BioResource Research Center (BRC), Kyoto, Japan.
Iscience
|June 12, 2025
Summary
Polyunsaturated fatty acids (PUFAs) impact Alzheimer's disease (AD) by regulating amyloid-beta (Aβ) production. Adjusting PUFA levels and ratios in neuronal membranes influences Aβ levels and neuronal function.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Alzheimer's disease (AD) is linked to amyloid-beta (Aβ) peptide accumulation.
- Polyunsaturated fatty acids (PUFAs), including docosahexaenoic acid (DHA) and arachidonic acid (ARA), are crucial components of neuronal membranes.
- The precise role of PUFAs in regulating Aβ production and neuronal function in AD remains incompletely understood.
Purpose of the Study:
- To investigate the effects of polyunsaturated fatty acids (PUFAs) on amyloid-beta (Aβ) production in human neurons.
- To elucidate the mechanisms by which PUFA composition in neuronal lipid membranes influences Aβ generation and neuronal pathophysiology.
- To determine how altering specific ratios of DHA and ARA impacts neuronal activity and morphology.
Main Methods:
- Cultured human cortical neurons derived from induced pluripotent stem cells (iPSCs).
- Manipulated cellular PUFA deficiency and progressively alleviated these conditions.
- Analyzed changes in lipid membrane composition, membrane fluidity, Aβ production, neuronal synchronicity, and cell morphology.
Main Results:
- Under PUFA-deficient conditions, increased total PUFA content in neuronal membranes enhanced fluidity and reduced Aβ production.
- When overall PUFA deficiency was resolved, specific alterations in DHA and ARA ratios promoted neuronal synchronous activity and morphological complexity.
- Neuronal membrane fluidity was maintained consistently across different DHA/ARA ratios.
Conclusions:
- The overall PUFA composition of the neuronal lipid membrane is a key regulator of Aβ production.
- Specific ratios of DHA and ARA within the total PUFA content modulate neuronal function, including synchronous activity and morphology.
- These findings highlight the critical role of neuronal lipid membrane composition in Alzheimer's disease pathogenesis and neuronal health.
More Related Videos
00:15Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
Published on: September 28, 2019
5.9K
10:19Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps
Published on: August 14, 2016
9.3K
Related Concept Videos
03:03Amyloid Fibrils
9.3K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.3K
01:37Neural Regulation
39.2K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
39.2K
01:31Lipid-derived Compounds in the Human Body
4.3K
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
4.3K
01:32Membrane Lipids
23.0K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
23.0K
03:38Structure of Lipids
87.4K
Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
87.4K
01:23Role of Neurotransmitters in Memory
482
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
482