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Related Experiment Video

Updated: May 26, 2026

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions

Published on: October 21, 2017

Lactate produced by glycogenolysis in astrocytes regulates memory processing.

Lori A Newman¹, Donna L Korol, Paul E Gold

¹Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America. lanewman@illinois.edu

|December 20, 2011

Summary

Glucose enhances memory by fueling brain cells with lactate, derived from astrocyte glycogen stores. This process is crucial for memory formation and cognitive function.

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Area of Science:

Neuroscience
Cellular Metabolism
Cognitive Science

Background:

Glucose administration enhances memory, but the underlying mechanisms remain incompletely understood.
Brain glucose levels dynamically change during memory tasks, suggesting active metabolic regulation.
Astrocytes play a key role in brain energy metabolism and neuronal support.

Purpose of the Study:

To investigate the hypothesis that glucose enhances memory via astrocyte glycogen metabolism to lactate.
To elucidate the role of astrocyte-derived lactate in neuronal energy supply during memory tasks.
To determine the contribution of lactate transport into neurons for memory enhancement.

Main Methods:

Utilized sensitive bioprobes for real-time measurement of brain glucose and lactate levels in rats.
Administered glucose, lactate, and pharmacological agents to manipulate astrocytic glycogenolysis and lactate transport.
Assessed memory performance in rats using a spatial working memory task.

Main Results:

Observed decreased extracellular glucose and increased lactate in the hippocampus during spatial working memory tasks.
Demonstrated that intrahippocampal lactate infusion enhanced memory performance.
Showed that inhibiting astrocytic glycogenolysis impaired memory, an effect reversed by lactate or glucose.
Found that blocking lactate uptake into neurons impaired memory, irrespective of glucose or lactate availability.

Conclusions:

Astrocytes regulate memory formation by controlling the supply of lactate to neurons.
Lactate, derived from astrocyte glycogen, serves as a critical energy substrate for neuronal function during memory tasks.
Efficient lactate transport into neurons is essential for memory enhancement by glucose and lactate.