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Published on: August 25, 2014
Linalool reverses neuropathological and behavioral impairments in old triple transgenic Alzheimer's mice
Angélica Maria Sabogal-Guáqueta1, Edison Osorio2, Gloria Patricia Cardona-Gómez1
1Neuroscience Group of Antioquia, Cellular and Molecular Neurobiology Area - School of Medicine, SIU, University of Antioquia UdeA, Calle 70 No, 52-21, Medellin, Colombia.
Abstract:
Alzheimer's disease (AD) is an age-related progressive neurodegenerative disorder. Several types of treatments have been tested to block or delay the onset of the disease, but none have been completely successful. Diet, lifestyle and natural products are currently the main scientific focuses. Here, we evaluate the effects of oral administration of the monoterpene linalool (25 mg/kg), every 48 h for 3 months, on aged (21-24 months old) mice with a triple transgenic model of AD (3xTg-AD) mice. Linalool-treated 3xTg-AD mice showed improved learning and spatial memory and greater risk assessment behavior during the elevated plus maze. Hippocampi and amygdalae from linalool-treated 3xTg-AD mice exhibited a significant reduction in extracellular β-amyloidosis, tauopathy, astrogliosis and microgliosis as well as a significant reduction in the levels of the pro-inflammatory markers p38 MAPK, NOS2, COX2 and IL-1β. Together, our findings suggest that linalool reverses the histopathological hallmarks of AD and restores cognitive and emotional functions via an anti-inflammatory effect. Thus, linalool may be an AD prevention candidate for preclinical studies.
Insights
Linalool, a natural compound, improved cognitive and emotional functions in a mouse model of Alzheimer's disease (AD). It reduced key AD hallmarks and inflammation, suggesting potential for AD prevention.
Area of Science:
- Neuroscience
- Pharmacology
- Gerontology
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder with limited treatment options.
- Research is focusing on lifestyle, diet, and natural products for AD prevention and treatment.
- Natural products offer a promising avenue for managing age-related cognitive decline.
Purpose of the Study:
- To investigate the therapeutic potential of linalool in an Alzheimer's disease mouse model.
- To evaluate the effects of linalool on cognitive function, memory, and emotional behavior.
- To examine the impact of linalool on AD-related neuropathology and neuroinflammation.
Main Methods:
- Oral administration of linalool (25 mg/kg) every 48 hours for 3 months to aged triple transgenic AD mice (3xTg-AD).
- Assessment of learning, spatial memory, and risk assessment behavior using behavioral tests (e.g., elevated plus maze).
- Histopathological analysis of brain tissues (hippocampi and amygdalae) for amyloid-beta, tauopathy, astrogliosis, and microgliosis.
Main Results:
- Linalool treatment significantly improved learning, spatial memory, and risk assessment in 3xTg-AD mice.
- Reduced levels of extracellular beta-amyloidosis, tauopathy, astrogliosis, and microgliosis were observed in the brains of treated mice.
- Linalool administration led to a significant decrease in pro-inflammatory markers, including p38 MAPK, NOS2, COX2, and IL-1β.
Conclusions:
- Linalool effectively reverses key histopathological hallmarks of Alzheimer's disease in a mouse model.
- The compound restores cognitive and emotional functions, likely through its anti-inflammatory effects.
- Linalool shows promise as a potential candidate for Alzheimer's disease prevention in preclinical studies.
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