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Imaging of Biological Tissues by Desorption Electrospray Ionization Mass Spectrometry
Published on: July 12, 2013
Investigation of Phospholipid Differences in Valproic Acid-Induced Autistic Mouse Model Brain Using Mass Spectrometry
Hyun Jun Jang1, Kyoung Ja Kwon2, Chan Young Shin3
1Center for Cognition and Sociality, Institute for Basic Science, 55 Expo-ro, Yuseong-gu, Daejeon 34126, Republic of Korea.
Insights
Autism spectrum disorder (ASD) is linked to altered lipid metabolism. Researchers used MALDI-MSI to find differences in brain phospholipids, including those with crucial polyunsaturated fatty acids (PUFAs), in an ASD mouse model.
Area of Science:
- Neuroscience
- Biochemistry
- Metabolomics
Background:
- Autism spectrum disorder (ASD) is a complex neurodevelopmental condition with unknown causes and treatments.
- Altered levels of polyunsaturated fatty acids (PUFAs) in biological fluids suggest a connection between lipid metabolism and ASD.
- Changes in cell membrane phospholipid distribution may underlie ASD pathophysiology.
Purpose of the Study:
- To investigate phospholipid distribution in the brain tissue of a valproic acid-induced mouse model of ASD.
- To identify specific phospholipids and their alterations in different brain regions of the ASD model.
- To explore the role of lipid metabolism changes in ASD pathogenesis.
Main Methods:
- Utilized matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) to analyze brain tissue.
- Examined phospholipid profiles in various brain regions of valproic acid-induced autistic mice and control groups.
- Identified key phospholipids, including phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine.
Main Results:
- Significant differences in phospholipid distribution were observed between the ASD model and control groups.
- Specific phospholipids containing docosahexaenoic acid and arachidonic acid were identified.
- Alterations in these PUFA-containing phospholipids suggest a disruption in lipid metabolism within the ASD brain.
Conclusions:
- MALDI-MSI revealed distinct alterations in brain phospholipid profiles in an ASD mouse model.
- These findings highlight the importance of lipid metabolism and specific PUFAs in ASD.
- Combining MALDI-MSI with conventional analyses can advance understanding of ASD-associated metabolic changes.
Abstract:
Autism is a neurodevelopmental disorder for which the cause and treatment have yet not been determined. The polyunsaturated fatty acid (PUFA) levels change rapidly in the blood or cerebrospinal fluid of autistic children and PUFAs are closely related to autism spectrum disorder (ASD). This finding suggests that changes in lipid metabolism are associated with ASD and result in an altered distribution of phospholipids in cell membranes. To further understand ASD, it is necessary to analyze phospholipids in organs consisting of nerve cells, such as the brain. In this study, we investigated the phospholipid distribution in the brain tissue of valproic acid-induced autistic mice using matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI). Phospholipids including phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine were identified in each brain region and exhibited differences between the ASD and control groups. These phospholipids contain docosahexaenoic acid and arachidonic acid, which are important PUFAs for cell signaling and brain growth. We expect that the differences in phospholipids identified in the brain tissue of the ASD model with MALDI-MSI, in conjunction with conventional biological fluid analysis, will help to better understand changes in lipid metabolism in ASD.
