Abstract
Rationale
Attention-deficit hyperactivity disorder (ADHD) is the most frequently diagnosed neuropsychiatric disorder in childhood. Currently available ADHD drugs include the psychostimulants methylphenidate (MPH) and d-amphetamine (D-AMP), acting on norepinephrine and dopamine transporters/release, and atomoxetine (ATX), a selective norepinephrine uptake inhibitor. Recent evidence suggests an involvement of glutamate neurotransmission in the pathology and treatment of ADHD, via mechanisms to be clarified.
Objective
We have investigated how ADHD drugs could modulate, through interaction with catecholamine receptors, basal and glutamate-induced excitability of pyramidal neurons in the prefrontal cortex (PFC), a region which plays a major role in control of attention and impulsivity.
Methods
We have used the technique of extracellular single-unit recording in anaesthetised rats coupled with microiontophoresis.
Results
Both MPH (1–3 mg/kg) and d-AMP (1–9 mg/kg) increased the firing activity of PFC neurons in a dopamine D1 receptor-dependent manner. ATX administration (1–6 mg/kg) also increased the firing of neurons, but this effect is not significantly reversed by D1 (SCH 23390) or alpha1 (prazosin) receptor antagonists but potentiated by alpha2 antagonist (yohimbine). All drugs induced a clear potentiation of the excitatory response of PFC neurons to the microiontophoretic application of the glutamate agonist N-methyl-d-aspartate (NMDA), but not to the glutamate agonist α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA). The potentiating effect of d-AMP on NMDA-induced activation of PFC neurons was partially reversed or prevented by dopamine D1 receptor blockade.
Conclusion
Our data shows that increase in excitability of PFC neurons in basal conditions and via NMDA receptor activation may be involved in the therapeutic response to ADHD drugs.
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Abbreviations
- ATX:
-
Atomoxetine
- D-AMP:
-
d-Amphetamine
- DAT:
-
Dopamine transporter
- MPH:
-
Methylphenidate
- NET:
-
Norepinephrine transporter
- NMDA:
-
N-Methyl-d-aspartate
- PFC:
-
Prefrontal cortex
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Acknowledgments
This study was supported by internal DMU funds. The authors thank Mrs Anita O’Donoghue for excellent technical support and Dr. Florence Serres (Oxford University) for carefully reading the manuscript.
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Di Miceli, M., Gronier, B. Psychostimulants and atomoxetine alter the electrophysiological activity of prefrontal cortex neurons, interaction with catecholamine and glutamate NMDA receptors. Psychopharmacology 232, 2191–2205 (2015). https://doi.org/10.1007/s00213-014-3849-y
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DOI: https://doi.org/10.1007/s00213-014-3849-y