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Activation of mGlu2 Receptors Rescues Persistent Post-Methamphetamine Deficit in Object-in-Place Recognition Memory
Viktoria Galbava1,2, Lizhen Wu1, Marek Schwendt1,2
1Department of Psychology, University of Florida, Gainesville, FL 32611, USA.
Brain Sciences
|July 28, 2026
Summary
Methamphetamine use disorder causes lasting cognitive deficits, impairing memory and increasing relapse risk. Potentiating metabotropic glutamate receptor 2 (mGlu2) with LY-487379 successfully rescued these memory impairments in rats.
Area of Science:
- Neuroscience
- Pharmacology
- Addiction Research
Background:
- Persistent cognitive impairments are common in methamphetamine (meth) use disorder, leading to poor decision-making and relapse.
- Current treatments for meth-induced cognitive deficits are lacking, and their underlying neurobiology is not fully understood.
Purpose of the Study:
- Investigate the impact of chronic meth self-administration on episodic-like recognition memory.
- Determine if enhancing metabotropic glutamate receptor 2 (mGlu2) activity can reverse these cognitive deficits.
Main Methods:
- Adult male rats underwent extended access to meth self-administration, followed by a withdrawal period.
- Episodic-like recognition memory was assessed using the object-in-place (OIP) task.
- The mGlu2 positive allosteric modulator LY-487379 was administered, and mGlu2/3 protein levels were analyzed.
Main Results:
- Chronic meth self-administration led to escalated intake and persistent deficits in OIP memory.
- Administration of LY-487379 acutely restored OIP memory performance.
- Meth exposure increased surface mGlu2/3 receptor expression without altering total levels.
Conclusions:
- Chronic meth use causes persistent cognitive dysfunction, which can be reversed by potentiating mGlu2 receptors.
- Increased surface mGlu2/3 expression may be a compensatory response but is insufficient to restore function alone.
- These findings support further investigation of mGlu2 in stimulant-associated cognitive deficits.
