Summary: Exploring systemwide intracellular metabolic cooperation as a mechanism for learning offers promise for a better understanding of how memory and learning occur in the brain.
Source: HSE
Exploring the predictive properties of neuronal metabolism can contribute to our understanding of how humans learn and remember.
This key finding from a consideration of molecular mechanisms of learning and memory conducted by scientists from Russia and the U.S. has beenpublishedinNeuroscience & Biobehavioral Reviews.
The emerging trend in neuroscience is to consider the work of neurons as anticipatory and future oriented, although this approach is not yet mainstream and features in just a few publications.
In a paper entitled Neuronal metabolism in learning and memory: The anticipatory activity perspective, Yuri I. Alexandrov, HSE Professor and Head of the V.B. Shvyrkov Laboratory of Psychophysiology at the Russian Academy of Sciences Institute of Psychology, and Mikhail V. Pletnikov, Professor of the Department of Physiology at the State University of New York, University at Buffalo, argue that neurons behave proactively because they strive to survivejust as all living organisms.
Neurons use microenvironmental metabolites as food, and neuronal impulse activity is aimed at obtaining these metabolites. Rather than responding to an incoming signal, neurons proactively trigger an influx of needed substances to the cell, such as neurotransmitters.
Yuri Alexandrov, Professor at HSESchool of Psychology said, When a specialized set of our neurons fire together, we act to obtain a behavioral outcome, while the neurons also obtain their own micro-outcome in the form of needed metabolites.
This process can be described as metabolic cooperation of cells, involving not only neurons but also glial, somatic, glandular, muscle and other cells throughout the body.
This principle of how cells work is central to learning, which essentially means creating systemwide groups of metabolically cooperating cells that drive human behavior.
The researchers note that for a long time, the stimulus-response paradigm was dominant in the study of molecular mechanisms of learning and memory; it was assumed that just as the entire human body responds to environmental stimuli, neurons respond to incoming impulses which cause excitation of certain parts of the neurons membrane. The neuron either fires or does not fire, depending on whether or not the excitation reaches a certain threshold.
Back in 1930s1970s, the Russian physiologist Peter Anokhin developed his theory of functional systems, including the concept of integrative activity of neurons, according to which a neurons excitation causes intraneuronal chemical processesrather than a summation of local excitations on the membrane. These chemical processes lead to a neuronal spike.
Building on Anokhins theory, his student Vyacheslav Shvyrkov and colleagues developed a systems-oriented approach to the study of neurons. However, Anokhins understanding of the sequence of events was traditional: excitation of a neuron comes first, followed by a response.
An important recent step in understanding how neurons work has been the idea that a neurons anticipatory activity, rather than an external impulse, is what comes first. The neuron does not respond to incoming excitation but proactively triggers an influx of activity, Alexandrov explains.
The authors argue that exploring systemwide intercellular metabolic cooperation as a learning mechanism could be a promising area of focus for further experimental research.
This approach, they believe, could lead to breakthroughs in studying the behavior of malignant cells and in developing new cancer treatments.
Malignancies consist of cells that metabolically cooperate not only with their immediate environment but also with other cells in the body. We plan to conduct experimental studies to explore tumor cell responses to diametrically opposed individual behaviors, such as striving towards a desirable event or avoiding an undesirable or dangerous one. This can give us insight into how various systemwide cellular integrations impact tumor cells survival.
As a result, we hope to propose an effective approach to influencing tumor cells through human behavior, Alexandrov concludes.
Author: Ksenia BregadzeSource: HSEContact: Ksenia Bregadze HSEImage: The image is in the public domain
Original Research: Closed access.Neuronal metabolism in learning and memory: The anticipatory activity perspective by Yuri Alexandrov et al. Neuroscience and Biobehavioral Review
Abstract
Neuronal metabolism in learning and memory: The anticipatory activity perspective
Current research on the molecular mechanisms oflearning and memoryis based on the stimulus-response paradigm, in which the neural circuits connecting environmental events with behavioral responses are strengthened.
By contrast, cognitive and systemsneuroscienceemphasize the intrinsic activity of the brain that integrates information, establishes anticipatory actions, executes adaptive actions, and assesses the outcome via regulatory feedback mechanisms.
We believe that the difference in the perspectives of systems and molecular studies is a major roadblock to further progress toward understanding the mechanisms of learning and memory.
Here, we briefly overview the current studies in molecular mechanisms of learning and memory and propose that studying the predictive properties of neuronal metabolism will significantly advance our knowledge of how intrinsic, predictive activity of neurons shapes a new learning event.
We further suggest that predictive metabolic changes in the brain may also take place in non-neuronal cells, including those of peripheral tissues.
Finally, we present a path forward toward more in-depth studies of the role of cell metabolism in learning and memory.
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