Synaptic changes behind ketamine’s quick relief of stress-related anhedonia
Official title: A synaptic substrate for ketamine-mediated amelioration of stress-induced anhedonia
Funded at Washington University · NIH-11380643 · Data updated 2026-11-12
Researchers are studying how a single low dose of ketamine rapidly eases anhedonia by changing brain connections, aiming to help people with treatment-resistant depression.
Quick facts
| Grant type | R01 grant |
|---|---|
| Study type | NIH-funded research |
| Funding institution | Washington University NIH-funded |
| Lab location | 1 site (Saint Louis, United States) |
| Project start | August 15, 2022 |
| Project end | May 31, 2027 |
| Funding year | 2026 |
| Award (this year) | $388,750 |
| NIH project number | 5R01MH130610-05 |
| Project ID | NIH-11380643 on NIH RePORTER |
Who could benefit from this research
✓Could help
Adults with treatment-resistant depression or prominent anhedonia who may benefit from rapid-acting antidepressant strategies in future trials.
✕Less likely to help
People whose depression does not involve anhedonia or who are not candidates for rapid-acting antidepressant approaches may see little direct benefit.
What this research studies
This project looks at how ketamine affects brain synapses and circuits to produce fast relief from anhedonia, a core symptom of depression. The study focuses on the role of AMPA receptors and new synapse formation to understand why ketamine can improve mood within hours. By using animal models and possibly human data, the work aims to map the neural pathways that underlie this rapid antidepressant effect. The ultimate goal is to inform future treatments that mimic ketamine’s benefits with fewer risks.
Why it matters
Potential benefit: If successful, the work could lead to faster-acting treatments for depression, especially for patients who do not respond to traditional antidepressants.
How similar studies have gone: Prior studies have shown rapid antidepressant effects with ketamine in some patients, but understanding the synaptic mechanisms is ongoing and could enhance future therapies.
Where this research is happening
-
Washington University
Saint Louis, United States Active
Researchers
- Principal investigator: Pignatelli, Marco — Washington University
- Study coordinator: Pignatelli, Marco
Related research
Other NIH-funded projects on the same topics.
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Ketamine's effects on anhedonia and anxiety in depression explored with ultra-high-field brain imaging
Researchers will study how specific brain circuits relate to anhedonia and anxiety in adults with depression using ultra-high-field MRI and ketamine-related insights.
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This work looks at whether stress changes a brain chemical called glutamate in people with depression and whether ketamine can help reverse loss of pleasure.
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This study is looking at how long-term stress can make people lose interest in things they used to enjoy, which is a common issue for those with depression, and it aims to understand how changes in brain chemicals might explain this, so we can find better treatments for everyone affected.
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How ketamine can quickly reverse stress-related loss of pleasure
This work looks at how a single low dose of ketamine can rapidly restore pleasure and motivation for people with stress-related depression.
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Investigating how ketamine affects depression-related symptoms using advanced MRI technology
This study is looking at how ketamine helps people with depression feel better, especially when it comes to feeling joy and managing anxiety, by using advanced brain scans to see how certain parts of the brain work in adults with depression.
-
Investigating how stress affects reward response and treatment with ketamine
This study is looking at how long-term stress can make people with major depressive disorder lose interest in things they used to enjoy, and it aims to understand how a brain chemical called glutamate is involved, especially with the hope that ketamine might help improve these feelings.
About this research
- This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
- Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
- For full project details, budget, and progress reports, visit the official NIH RePORTER page.