Neuropharmacology of light-induced locomotor activation

Amato D, Pum ME, Groos D, Lauber AC, Huston JP, Carey RJ, Silva MADS, Müller C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Neuropharmacology Elsevier

Book Volume: 95

Pages Range: 243-51

DOI: 10.1016/j.neuropharm.2015.03.023

Abstract

Presentation of non-aversive light stimuli for several seconds was found to reliably induce locomotor activation and exploratory-like activity. Light-induced locomotor activity (LIA) can be considered a convenient simple model to study sensory-motor activation. LIA was previously shown to coincide with serotonergic and dopaminergic activation in specific cortical areas in freely moving and anesthetized animals. In the present study we explore the neuropharmacology of LIA using a receptor antagonist/agonist approach in rats. The non-selective 5-HT2-receptor antagonist ritanserin (1.5-6 mg/kg, i.p.) dose-dependently reduced LIA. Selective antagonism of either the 5-HT2A-receptor by MDL 11,939 (0.1-0.4 mg/kg, i.p.), or the 5-HT2C-receptor by SDZ SER 082 (0.125-0.5 mg/kg, i.p.), alone or in combination, had no significant influence on LIA. Also the selective 5-HT1A-receptor antagonist, WAY 100635 (0.4 mg/kg, i.p.) did not affect LIA. Neither did the preferential dopamine D2-receptor antagonist, haloperidol (0.025-0.1 mg/kg, i.p.) nor the D2/D3-receptor agonist, quinpirole (0.025-0.5 mg/kg, i.p.) affect the expression of LIA. However, blocking the glutamatergic NMDA-receptor with phencyclidine (PCP, 1.5-6 mg/kg, i.p.) dose-dependently reduced LIA. This effect was also observed with ketamine (10 mg/kg, i.p.). These findings suggest that serotonin and dopamine receptors abundantly expressed in the cortex do not mediate light-stimulus triggered locomotor activity. PCP and ketamine effects, however, suggest an important role of NMDA receptors in LIA.

Authors with CRIS profile

Davide Amato Department of Psychiatry and Psychotherapy Christiane Müller Medizinische Fakultät

Involved external institutions

Heinrich-Heine-Universität Düsseldorf DE Germany (DE) Syracuse VA Medical Center US United States (USA) (US)

How to cite

APA:

Amato, D., Pum, M.E., Groos, D., Lauber, A.C., Huston, J.P., Carey, R.J.,... Müller, C. (2015). Neuropharmacology of light-induced locomotor activation. Neuropharmacology, 95, 243-51. https://dx.doi.org/10.1016/j.neuropharm.2015.03.023

MLA:

Amato, Davide, et al. "Neuropharmacology of light-induced locomotor activation." Neuropharmacology 95 (2015): 243-51.

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