Related Experiment Video
Updated: Aug 12, 2026
09:01
Metabolomic Analysis of Rat Brain by High Resolution Nuclear Magnetic Resonance Spectroscopy of Tissue Extracts
Published on: September 21, 2014
The origin of free brain malonate
K M Riley1, A C Dickson, A H Koeppen
1Research Service, Veterans Administration Medical Center, Albany, N.Y. 12208.
Neurochemical Research
|February 1, 1991
Summary
Free malonate in rat brains originates from acetyl-CoA, likely produced by fatty acid oxidation. This pathway is most active in young rats, suggesting developmental regulation of malonate synthesis.
Area of Science:
- Neurochemistry
- Metabolic Biochemistry
- Developmental Neuroscience
Background:
- Free malonate is abundant in rat brains, but its origin and function remain unclear.
- Dietary intake has been ruled out as a source.
- Malonic aciduria, linked to malonyl-CoA decarboxylase deficiency, causes intellectual disability.
Purpose of the Study:
- To investigate the metabolic origins of free malonate in the rat brain.
- To identify precursors that contribute to malonate biosynthesis.
- To understand the developmental aspects of malonate production.
Main Methods:
- Intracerebral injection of radiolabeled acetyl-CoA precursors (acetate, butyrate, pyruvate, citrate, beta-alanine) into rat brains.
- Analysis of radioactivity in glutamate and malonate.
- Comparison of precursor effectiveness at different developmental ages.
Main Results:
- Acetate and butyrate, but not pyruvate or citrate, effectively labeled brain malonate.
- The labeling pattern supports a pathway from acetyl-CoA to malonyl-CoA to malonate.
- Malonate labeling from acetate was most efficient in 7-day-old rats, when brain malonate levels are low.
- Butyrate was a more effective precursor than acetate in young rats.
Conclusions:
- Fatty acid oxidation is proposed as the primary source of acetyl-CoA for free brain malonate synthesis.
- Compartmentation likely explains why citrate and pyruvate are ineffective precursors.
- Developmental regulation and potential compartmentation influence malonate biosynthesis in the brain.
More Related Videos
Related Concept Videos
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
01:35Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives
Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
01:20Inborn Errors of Metabolism
Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
01:29Hepatic Encephalopathy
DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...