Dominguez-Lopez 2023 Neuropharmacology

From Bioblast
Publications in the MiPMap
Dominguez-Lopez S, Ahn B, Sataranatarajan K, Ranjit R, Premkumar P, Van Remmen H, Beckstead MJ (2023) Long-term methamphetamine self-administration increases mesolimbic mitochondrial oxygen consumption and decreases striatal glutathione.

Β» Neuropharmacology 227:109436. PMID: 36693561 Open Access

Dominguez-Lopez Sergio, Ahn Bumsoo, Sataranatarajan Kavithalakshmi, Ranjit Rojina, Premkumar Pavithra, Van Remmen Holly, Beckstead Michael J (2023) Neuropharmacology

Abstract: Neurotoxic regimens of methamphetamine (METH) are known to increase reactive oxygen species (ROS), affect redox homeostasis, and lead to damage in dopamine neurons. Functional changes induced by long-term METH self-administration on mitochondrial respiratory metabolism and redox homeostasis are less known. To fill this gap, we implanted a jugular catheter into adult male mice and trained them to nose poke for METH infusions. After several weeks of METH exposure, we collected samples of the ventral striatum (vST) and the ventral midbrain (vMB). We used HPLC to determine the levels of the ROS scavenger glutathione in its reduced (GSH) and oxidized forms. Then, we used high-resolution respirometry to determine the oxygen consumption rate (OCR) of mitochondrial complexes. Finally, using in vivo electrophysiology, we assessed changes in dopamine neuron firing activity in the VTA. METH self-administration produced a decrease of the GSH pool in vST, correlating with lifetime METH intake. We observed increased mitochondrial respiration across the two mesolimbic regions. METH self-administration decreases firing rate and burst activity but increases the number of spontaneously active dopamine neurons per track. We conclude that METH self-administration progressively decreased the antioxidant pool in sites of higher dopamine release and produced an increase in mitochondrial metabolism in the mesolimbic areas, probably derived from the increased number of dopamine neurons actively firing. However, dopamine neuron firing activity is decreased by METH self-administration, reflecting a new basal level of dopamine neurotransmission. β€’ Keywords: Dopaminem, Drug use, Glutathione, Methamphetamine, Mitochondria, Self-administration β€’ Bioblast editor: Plangger M β€’ O2k-Network Lab: US NC Winston-Salem Ahn B, US OK Oklahoma City Van Remmen H

Labels: MiParea: Respiration, Pharmacology;toxicology 

Organism: Mouse  Tissue;cell: Nervous system  Preparation: Permeabilized tissue 

Coupling state: LEAK, OXPHOS  Pathway: N, S, CIV, NS, ROX  HRR: Oxygraph-2k, O2k-Fluorometer 

2023-01, AmR 

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