Related Experiment Video
Updated: Aug 4, 2026
10:06
Cell Type-specific Gene Expression Profiling in the Mouse Liver
Published on: September 17, 2019
Galactose metabolism in regenerating rat liver
The Biochemical Journal
|January 15, 1976
Summary
Liver regeneration involves increased enzyme activity, specifically UDP-galactose 4-epimerase and UDP-galactose-glycoprotein galactosyltransferase. This rise is due to new enzyme protein synthesis, confirmed by actinomycin D blocking the effect.
Area of Science:
- Biochemistry
- Molecular Biology
- Hepatology
Background:
- Partial hepatectomy triggers liver regeneration.
- Enzyme activity changes are crucial indicators of regenerative processes.
Purpose of the Study:
- To investigate the changes in specific enzyme activities during liver regeneration in rats.
- To determine the mechanism behind the observed enzyme activity increases.
Main Methods:
- Rats underwent partial hepatectomy or sham operation under controlled conditions.
- Enzyme activities (UDP-galactose 4-epimerase, UDP-galactose-glycoprotein galactosyltransferase) were measured post-surgery.
- The effect of actinomycin D on enzyme activity was assessed.
Main Results:
- UDP-galactose 4-epimerase activity increased threefold, peaking at 4 days post-hepatectomy.
- UDP-galactose-glycoprotein galactosyltransferase showed biphasic activity peaks at 20h and 72h.
- Actinomycin D blocked the rise in enzyme activities, suggesting de novo protein synthesis.
Conclusions:
- Liver regeneration involves a significant increase in key glycosylation enzyme activities.
- The observed increase in enzyme activity is a result of newly synthesized enzyme proteins.
- This study elucidates the molecular mechanisms underlying enzyme regulation during hepatic regeneration.
Related Concept Videos
01:27Glucose Transporters
Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
01:24Liver Regeneration
The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...
01:19Overview of Carbohydrate Metabolism
Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...