Transient synaptic potentiation in nucleus accumbens shell during refraining from cocaine seeking.
| Autor: | Roberts-Wolfe DJ; Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina, USA., Heinsbroek JA; Department of Anesthesiology, University of Denver Medical School, Denver, Colorado, USA., Spencer SM; Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota, USA., Bobadilla AC; Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina, USA., Smith ACW; Department of Neuroscience, Mt Sinai School of Medicine, New York, New York, USA., Gipson CD; Department of Psychology, Arizona State University, Tempe, Arizona, USA., Kalivas PW; Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina, USA. |
|---|---|
| Jazyk: | angličtina |
| Zdroj: | Addiction biology [Addict Biol] 2020 May; Vol. 25 (3), pp. e12759. Date of Electronic Publication: 2019 May 06. |
| DOI: | 10.1111/adb.12759 |
| Abstrakt: | Repeated exposure to drug-associated cues without reward (extinction) leads to refraining from drug seeking in rodents. We determined if refraining is associated with transient synaptic plasticity (t-SP) in nucleus accumbens shell (NAshell), akin to the t-SP measured in the NAcore during cue-induced reinstatement of drug seeking. Using whole cell patch electrophysiology, we found that medium spiny neurons (MSNs) in NAshell expressed increased ratio of AMPA to NMDA glutamate receptor currents during refraining, which normalized to baseline levels by the end of the 2-hour extinction session. Unlike t-SP observed in NAcore during reinstated drug seeking, neither dendrite spine head enlargement nor activation of matrix metalloproteases (MMP2/9) accompanied the increased AMPA:NMDA in NAshell during refraining. Refraining was also not associated with changes in paired pulse ratio, NMDA receptor current decay time, or AMPA receptor rectification index in NAshell MSNs. Our preliminary data in transgenic mice suggest that t-SP may increase D2-MSN inputs relative to D1-MSN inputs. (© 2019 Society for the Study of Addiction.) |
| Databáze: | MEDLINE |
| Externí odkaz: |
|