Related Experiment Video
Updated: May 9, 2026
08:37
Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer
Published on: November 15, 2024
Gene specific modifications unravel ethanol and acetaldehyde actions
Yedy Israel1, Mario Rivera-Meza, Eduardo Karahanian
1Faculty of Medicine, Molecular and Clinical Pharmacology Program, University of Chile Santiago, Chile ; Department of Pharmacological and Toxicological Chemistry, University of Chile Santiago, Chile.
Frontiers in Behavioral Neuroscience
|July 13, 2013
Summary
Ethanol metabolism creates acetaldehyde, which has opposite effects depending on its location. Increased acetaldehyde in the liver causes aversion to alcohol, but in the brain, it enhances alcohol
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Ethanol (alcohol) is metabolized into acetaldehyde, a toxic compound, primarily in the liver and brain.
- Acetaldehyde is further metabolized into acetate by aldehyde dehydrogenase-2 (ALDH2).
- The location of acetaldehyde generation influences its physiological effects.
Purpose of the Study:
- To investigate the divergent roles of acetaldehyde generation in the liver versus the brain.
- To determine how manipulating acetaldehyde levels in specific organs affects ethanol's reinforcing properties.
- To explore the therapeutic potential of targeting ethanol metabolism pathways.
Main Methods:
- Gene-specific modifications were used to alter acetaldehyde generation in animal models.
- Transduction of genes for high-activity alcohol dehydrogenase (ADH1(*)B2) increased liver acetaldehyde.
- Inhibition of aldehyde dehydrogenase-2 (ALDH2) synthesis and catalase synthesis was achieved using antisense and shRNA techniques.
Main Results:
- Increased acetaldehyde generation in the liver led to higher blood acetaldehyde levels and ethanol aversion.
- Inhibition of liver ALDH2 also resulted in aversive effects.
- Conversely, increased acetaldehyde generation in the brain's ventral tegmental area (VTA) enhanced ethanol's reinforcing effects.
- Inhibition of brain catalase abolished ethanol's reinforcing effects and ethanol intake in high-drinking rats.
Conclusions:
- Acetaldehyde exhibits opposing effects based on its site of generation: aversive in the periphery (liver) but reinforcing in the brain.
- Targeting ethanol metabolism in the brain offers a potential strategy for managing alcohol consumption.
- Understanding organ-specific ethanol metabolism is crucial for developing effective treatments for alcohol use disorder.
Related Concept Videos
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:22Bioreactor Controls-III
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
01:19Aldehydes and Ketones with Alcohols: Hemiacetal Formation
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
01:37Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
01:46Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
01:24Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...