Related Experiment Video
Updated: May 1, 2026
07:59
Spectrophotometric Methods for the Study of Eukaryotic Glycogen Metabolism
Published on: August 19, 2021
4.2K
Astrocytic glycogenolysis: mechanisms and functions
Leif Hertz1, Junnan Xu, Dan Song
1Department of Clinical Pharmacology, China Medical University, No. 92 Beier Road, Heping District, 110001, Shenyang, Peoples' Republic of China.
Metabolic Brain Disease
|April 19, 2014
Summary
Glycogenolysis in astrocytes is crucial for brain cell communication and function, supporting neurotransmitter release and ion balance. This process is activated by various stimuli, with calcium signaling playing a key role.
Area of Science:
- Neuroscience
- Cellular Biology
- Biochemistry
Background:
- Glycogenolysis was previously considered an emergency process.
- Recent findings highlight its critical role in astrocytic functions.
Purpose of the Study:
- To elucidate the role of glycogenolysis in astrocytic functions.
- To investigate the signaling pathways regulating glycogenolysis in astrocytes.
Main Methods:
- Studied glycogenolysis during whisker stimulation.
- Investigated the effects of neurotransmitters and K+ on astrocyte signaling.
- Analyzed the role of Ca(2+) and cyclic AMP in glycogenolysis regulation.
Main Results:
- Glycogenolysis supports glutamate uptake, ATP release, and K+ uptake in astrocytes.
- Elevated K+ and certain transmitters increase cytosolic Ca(2+), activating glycogenolysis.
- Cyclic AMP has a limited, facilitatory role, dependent on Ca(2+) levels.
Conclusions:
- Astrocytic glycogenolysis is vital for neuronal communication and homeostasis.
- Calcium signaling is a primary activator of glycogenolysis, with a minor role for cyclic AMP.
- Glycogenolysis supports essential astrocyte functions beyond direct enzyme activation.
More Related Videos
Related Concept Videos
00:56What is Glycolysis?
148.4K
Overview
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
148.4K
01:23Glycolysis
2.1K
Glycolysis, the Embden-Meyerhof pathway, is a central metabolic pathway involved in glucose catabolism. It is highly conserved across most organisms, reflecting its fundamental role in cellular energy production. This process occurs in the cytoplasm and can function both in the presence and absence of oxygen, making it versatile for various organisms and environmental conditions.Stages of GlycolysisGlycolysis is a ten-step pathway that converts glucose into pyruvate, generating a net gain of...
2.1K
01:19Overview of Carbohydrate Metabolism
4.5K
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...
4.5K
01:22Lysosomal Hydrolases
3.5K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.5K
01:21Glycolysis: Preparatory Phase
10.3K
In cellular metabolism (the complete breakdown of glucose to extract energy), glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
10.3K
01:18Metabolic States of the Body: The Postabsorptive State
1.6K
The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
1.6K