Modulation of multiple memory systems: from neurotransmitters to metabolic substrates

Area of Science:

• Neuroscience
• Neurobiology
• Cognitive Science

Background:

• The hippocampus and striatum are key brain regions involved in learning and memory.
• Neurochemical modulators, such as acetylcholine, play a crucial role in regulating the activity of these regions.
• Brain glucose levels are dynamically altered during learning and influence neurochemical release.

Purpose of the Study:

• To review evidence on how neurochemical modulators and brain glucose impact hippocampal and striatal function in memory.
• To explore the role of astrocytes in providing energy substrates during learning.
• To integrate peripheral and central energy substrate availability in regulating memory processing.

Main Methods:

• Review of existing scientific literature and evidence.
• Analysis of studies examining neurochemical release (e.g., acetylcholine) in the hippocampus and striatum.
• Investigation of the relationship between brain glucose levels, astrocyte function, and neuronal energy supply.

Main Results:

• Relative release of acetylcholine in the hippocampus and striatum correlates with engagement in specific learning tasks.
• Brain glucose levels, influenced by hormones like epinephrine, regulate acetylcholine release.
• Astrocytes supply neurons with lactate derived from glucose and glycogen, serving as an energy substrate during learning.

Conclusions:

• Peripheral and central energy substrates, including glucose and lactate, are critical for regulating learning and memory across neural systems.
• Dysregulation of these physiological pathways may contribute to cognitive impairments in aging and neurodegenerative diseases.