Calcium-permeable AMPA receptors in the VTA and nucleus accumbens after cocaine exposure

When, how, and why?

Marina Wolf, Kuei Y. Tseng

Research output: Contribution to journalReview article

102 Citations (Scopus)

Abstract

In animal models of drug addiction, cocaine exposure has been shown to increase levels of calcium-permeable AMPA receptors (CP-AMPARs) in two brain regions that are critical for motivation and reward-the ventral tegmental area (VTA) and the nucleus accumbens (NAc). This review compares CP-AMPAR plasticity in the two brain regions and addresses its functional significance. In VTA dopamine neurons, cocaine exposure results in synaptic insertion of high conductance CP-AMPARs in exchange for lower conductance calcium-impermeable AMPARs (CI-AMPARs). This plasticity is rapid in onset (hours), GluA2-dependent, and can be observed with a single cocaine injection. Whereas it is short-lived after experimenter-administered cocaine, it persists for months after cocaine self-administration. In addition to strengthening synapses and altering C a2+ signaling, CP-AMPAR insertion alters subsequent induction of plasticity at VTA synapses. However, CP-AMPAR insertion is unlikely to mediate the increased DA cell activity that occurs during early withdrawal from cocaine exposure. Metabotropic glutamate receptor 1 (mGluR1) exerts a negative influence on CP-AMPAR accumulation in the VTA. Acutely, mGluR1 stimulation elicits a form of LTD resulting from CP-AMPAR removal and CI-AMPAR insertion. In medium spiny neurons (MSNs) of the NAc, extended access cocaine self-administration is required to increase CP-AMPAR levels. This is first detected after approximately a month of withdrawal and then persists. Once present in NAc synapses, CP-AMPARs mediate the expression of incubation of cue-induced cocaine craving. The mechanism of their accumulation may be GluA1-dependent, which differs from that observed in the VTA. However, similar to VTA, mGluR1 stimulation removes CP-AMPARs from MSN synapses. Loss of mGluR1 tone during cocaine withdrawal may contribute to CP-AMPAR accumulation in the NAc. Thus, results in both brain regions point to the possibility of using positive modulators of mGluR1 as treatments for cocaine addiction.

Original languageEnglish (US)
JournalFrontiers in Molecular Neuroscience
Issue numberJUNE 2012
DOIs
StatePublished - Jun 27 2012
Externally publishedYes

Fingerprint

Tegmentum Mesencephali
Ventral Tegmental Area
AMPA Receptors
Nucleus Accumbens
Cocaine
Calcium
Synapses
Self Administration
Brain
Neurons
Cocaine-Related Disorders
Calcium Signaling
Dopaminergic Neurons
Reward

Keywords

  • Addiction
  • Calcium-permeable AMPA receptor
  • Cocaine
  • Nucleus accumbens
  • Ventral tegmental area

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience

Cite this

Calcium-permeable AMPA receptors in the VTA and nucleus accumbens after cocaine exposure : When, how, and why? / Wolf, Marina; Tseng, Kuei Y.

In: Frontiers in Molecular Neuroscience, No. JUNE 2012, 27.06.2012.

Research output: Contribution to journalReview article

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