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Long-term Depression

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.

Long-term Depression

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...

Depression: Overview

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...

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Depressive Disorders: Etiology

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Related Experiment Video

Updated: May 9, 2026

Animal Models of Depression - Chronic Despair Model CDM

Animal Models of Depression - Chronic Despair Model CDM

Published on: September 23, 2021

Rafting toward a depression biomarker.

Mark M Rasenick¹

¹Psychiatry and Physiology, University ofIllinois College of Medicine, Jesse Brown VAMC, Chicago, IL, 60612, USA. raz@uic.edu.

European Archives of Psychiatry and Clinical Neuroscience

|August 19, 2025

Summary

Researchers are developing a blood test for depression and predicting antidepressant response by studying cytoskeleton and G protein signaling pathways. This biomarker-driven tool aims for objective assessment of depressed mood neurobiology.

Keywords:

Antidepressant G protein GPCR Llipid raft cAMP

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Area of Science:

Neurobiology
Cellular Signaling
Biomarker Discovery

Background:

Depression diagnosis and treatment prediction remain challenging.
Current assessment tools for depressed mood lack objectivity.
Understanding the neurobiological underpinnings is crucial for diagnostic advancement.

Purpose of the Study:

To outline progress towards a simple blood diagnostic for depression.
To identify biomarkers for predicting individual antidepressant response.
To develop a quantitative, objective assessment tool for depressed mood.

Main Methods:

Investigating the roles of the cytoskeleton in depression.
Exploring G protein signaling pathways relevant to mood disorders.
Developing a biomarker-driven framework for assessment.

Main Results:

Significant progress has been made in linking cellular mechanisms to depression.
A potential framework for a depression blood test is emerging.
Early findings suggest biomarkers can predict treatment response.

Conclusions:

The research journey, though complex, is yielding promising results.
A quantitative, biomarker-driven tool for depression assessment is attainable.
This approach could revolutionize depression diagnosis and treatment selection.