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Outcomes of Glycolysis01:13

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Nearly all the energy used by cells comes from the bonds that make up complex organic compounds. These organic compounds are broken down into simpler molecules, such as glucose. As a result, cells extract energy from glucose over many chemical reactions—a process called cellular respiration.
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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...
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Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...
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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Deriving the Time Course of Glutamate Clearance with a Deconvolution Analysis of Astrocytic Transporter Currents
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Glycolysis-Derived Compounds From Astrocytes That Modulate Synaptic Communication.

Carlos-Alberto Gonçalves1, Letícia Rodrigues1, Larissa D Bobermin1

  • 1Department of Biochemistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.

Frontiers in Neuroscience
|February 8, 2019
PubMed
Summary

Astroglial cells utilize glucose through various pathways, producing compounds like lactate and glutathione that modulate neuronal function and synaptic plasticity. These glucose metabolites play crucial roles in brain energy and neurotransmission.

Keywords:
GSHastrocyteglycolysislactatemethylglyoxalneurotransmission

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Area of Science:

  • Neuroscience
  • Cellular Metabolism
  • Astrocyte Biology

Background:

  • The tripartite synapse involves astrocytes in regulating neuronal function.
  • Glucose metabolism in astrocytes is vital for providing energy and substrates for brain activity.
  • Astrocyte-derived metabolites influence neuronal communication.

Purpose of the Study:

  • To review the role of glucose-derived compounds in astroglial glycolytic pathways.
  • To elucidate how glucose metabolism in astrocytes impacts synaptic communication.
  • To describe the four main destinations of glucose in neural cells and their regulatory mechanisms.

Main Methods:

  • Conceptual review based on the tripartite synapse model.
  • Analysis of glucose metabolic pathways in astroglial cells.
  • Examination of astrocyte-secreted metabolites and their neuronal targets.

Main Results:

  • Glucose metabolism yields lactate, methylglyoxal, and glutathione, affecting neuronal receptors and channels.
  • Four key glucose destinations are identified: glycogen synthesis, pentose phosphate pathway, glycolysis, and hexosamine pathway.
  • Extracellular L-lactate, methylglyoxal, and glutathione modulate synaptic plasticity and neurotransmission via specific receptors (e.g., HCAR1, GABAA).

Conclusions:

  • Astroglial glucose metabolism is a critical determinant of synaptic function and plasticity.
  • Metabolites like lactate and glutathione released by astrocytes act as signaling molecules.
  • Understanding these pathways offers insights into brain energy homeostasis and neurological disorders.