Effects of acute and sub-chronic administrations of guanfacine on catecholaminergic transmissions in the orbitofrontal cortex

Neuropharmacology
Motohiro OkadaYuto Ueda

Abstract

The selective α2A adrenoceptor agonist guanfacine reduces hyperactivity and improves cognitive impairment in patients with attention-deficit/hyperactivity disorder (ADHD). The major mechanisms of guanfacine have been considered to involve activation of postsynaptic α2A adrenoceptor in frontal pyramidal neurons. However, the effects of chronic guanfacine administration on catecholaminergic transmissions associated with the orbitofrontal cortex (OFC) remain unclear. To explore the mechanisms of action of guanfacine on catecholaminergic transmission, the effects of its acute local or sub-chronic systemic administration on catecholamine release within pathways from locus coeruleus (LC) to OFC and reticular thalamic nucleus (RTN), from RTN to mediodorsal thalamic nucleus (MDTN), and from MDTN to OFC were determined using multi-probe microdialysis with ultra-high performance liquid chromatography. Acute OFC local administration of guanfacine did not affect catecholamine release in OFC. Acute LC local and sub-chronic systemic administrations of guanfacine reduced norepinephrine release in LC, OFC and RTN, and also reduced GABA release in MDTN, whereas AMPA-induced (perfusion with AMPA into NDTN) releases of l-glutamate, norepinephrine...Continue Reading

Citations

Feb 20, 2020·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Rafael E PerezDanny G Winder
Nov 5, 2020·International Journal of Molecular Sciences·Kouji Fukuyama, Motohiro Okada
Jan 6, 2021·International Journal of Molecular Sciences·Motohiro OkadaTakashi Shiroyama
Mar 3, 2021·Psychopharmacology·Chloe S ChernoffCatharine A Winstanley
May 1, 2021·International Journal of Molecular Sciences·Kouji FukuyamaMotohiro Okada
Mar 11, 2021·British Journal of Pharmacology·Motohiro Okada
Jun 3, 2021·International Journal of Molecular Sciences·Kouji Fukuyama, Motohiro Okada

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