Ketamine for a Boost of Neural Plasticity: How, but Also When?

Summary & key facts

This paper looks at how a low dose of ketamine can quickly make the brain more able to change, and why the timing of that temporary “open” period might matter for treatment. The authors review lab and human studies that show ketamine triggers a fast burst of brain signals and a protein that help form new connections. They suggest that if therapy or learning happens while the brain is in that open state, the treatment might be stronger. But they also say we do not yet know exactly how long the window lasts, who it helps most, or the best way to combine ketamine with therapy, and more research is needed.

Key facts:

• Ketamine can produce fast antidepressant effects in hours to days, unlike most standard antidepressants that take weeks.
• In animals and human studies, a single low dose of ketamine causes a quick increase in brain activity and in a growth-related protein called BDNF, which help form new connections between nerve cells.
• Researchers think ketamine creates a temporary window of increased brain plasticity — meaning the brain is more able to change — that could make psychotherapy or learning more effective if given at the right time.
• The biological steps linked to ketamine’s effects include boosting fast glutamate signaling and activating pathways that promote formation and strengthening of synapses, which are the links between brain cells.
• The timing of the plasticity window is unclear. It may start within hours and last for days, but researchers do not agree on the precise length or whether repeated doses change that window.
• There are still important unknowns and risks: we do not yet know the best way to combine ketamine with psychological treatments, which patients will benefit most, or the long-term safety and misuse risks.

Topics

Neuroscience and Neuropharmacology Research Treatment of Major Depression Tryptophan and brain disorders

Categories

Health Sciences Medicine Pharmacology

Tags

Antidepressant Cognition Dendritic spine Depression (economics) Dopamine Dopaminergic Economics Hippocampal formation Hippocampus Ketamine Macroeconomics Neuroplasticity Neuroscience Prefrontal cortex Psychology

Substances

Ketamine

Conditions & symptoms

Depression PTSD Feeling disconnected from others Lack of energy or motivation Poor sleep Sadness or low mood