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Ventral Midbrain NMDA Receptor Blockade: From Enhanced Reward and Dopamine Inactivation.

Author(s): Hernandez G, Cossette MP, Shizgal P, Rompré PP

Front Behav Neurosci. 2016;10:161 Authors: Hernandez G, Cossette MP, Shizgal P, Rompré PP

Article GUID: 27616984
17β-estradiol locally increases phasic dopamine release in the dorsal striatum.

Author(s): Shams WM, Cossette MP, Shizgal P, Brake WG

Neurosci Lett. 2018 02 05;665:29-32 Authors: Shams WM, Cossette MP, Shizgal P, Brake WG

Article GUID: 29175028
Early Adolescence is a Critical Period for the Maturation of Inhibitory Behavior.

Author(s): Reynolds LM, Yetnikoff L, Pokinko M, Wodzinski M, Epelbaum JG, Lambert LC, Cossette MP, Arvanitogiannis A, Flores C

Cereb Cortex. 2018 Oct 06;: Authors: Reynolds LM, Yetnikoff L, Pokinko M, Wodzinski M, Epelbaum JG, Lambert LC, Cossette MP, Arvanitogiannis A, Flores C

Article GUID: 30295713
The neural substrates for the rewarding and dopamine-releasing effects of medial forebrain bundle stimulation have partially discrepant frequency responses.

Author(s): Cossette MP, Conover K, Shizgal P

Behav Brain Res. 2016 Jan 15;297:345-58 Authors: Cossette MP, Conover K, Shizgal P

Article GUID: 26477378
High Oestradiol Replacement Reverses Response Memory Bias in Ovariectomised Female Rats Regardless of Dopamine Levels in the Dorsal Striatum.

Author(s): Hussain D, Cossette MP, Brake WG

J Neuroendocrinol. 2016 05;28(5): Authors: Hussain D, Cossette MP, Brake WG

Article GUID: 26929121
Title:The neural substrates for the rewarding and dopamine-releasing effects of medial forebrain bundle stimulation have partially discrepant frequency responses.
Authors:Cossette MP,  Conover K,  Shizgal P
Link:https://www.ncbi.nlm.nih.gov/pubmed/26477378?dopt=Abstract
Category:Behav Brain Res
PMID:26477378
Dept Affiliation: CSBN
1 Center for Studies in Behavioral Neurobiology/Groupe de Recherche en Neurobiologie Comportementale, Concordia University, 7141 Sherbrooke Street West, SP-244, Montréal, Québec H4B 1R6, Canada. Electronic address: mpy_cossette@hotmail.com.
2 Center for Studies in Behavioral Neurobiology/Groupe de Recherche en Neurobiologie Comportementale, Concordia University, 7141 Sherbrooke Street West, SP-244, Montréal, Québec H4B 1R6, Canada. Electronic address: kent.conover@gmail.com.
3 Center for Studies in Behavioral Neurobiology/Groupe de Recherche en Neurobiologie Comportementale, Concordia University, 7141 Sherbrooke Street West, SP-244, Montréal, Québec H4B 1R6, Canada. Electronic address: peter.shizgal@concordia.ca.

Description:

The neural substrates for the rewarding and dopamine-releasing effects of medial forebrain bundle stimulation have partially discrepant frequency responses.

Behav Brain Res. 2016 Jan 15;297:345-58

Authors: Cossette MP, Conover K, Shizgal P

Abstract

Midbrain dopamine neurons have long been implicated in the rewarding effect produced by electrical brain stimulation of the medial forebrain bundle (MFB). These neurons are excited trans-synaptically, but their precise role in intracranial self-stimulation (ICSS) has yet to be determined. This study assessed the hypothesis that midbrain dopamine neurons are in series with the directly stimulated substrate for self-stimulation of the MFB and either perform spatio-temporal integration of synaptic input from directly activated MFB fibers or relay the results of such integration to efferent stages of the reward circuitry. Psychometric current-frequency trade-off functions were derived from ICSS performance, and chemometric trade-off functions were derived from stimulation-induced dopamine transients in the nucleus accumbens (NAc) shell, measured by means of fast-scan cyclic voltammetry. Whereas the psychometric functions decline monotonically over a broad range of pulse frequencies and level off only at high frequencies, the chemometric functions obtained with the same rats and electrodes are either U-shaped or level off at lower pulse frequencies. This discrepancy was observed when the dopamine transients were recorded in either anesthetized or awake subjects. The lack of correspondence between the psychometric and chemometric functions is inconsistent with the hypothesis that dopamine neurons projecting to the NAc shell constitute an entire series stage of the neural circuit subserving self-stimulation of the MFB.

PMID: 26477378 [PubMed - indexed for MEDLINE]