Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

The serotonin 1A (5-HT(1A)) receptor is one of the best described receptor subtypes of the serotonergic system. Due to the complex distribution pattern, the pre- and postsynaptic localisation, the impact on various monoamines, as well as the influence on a wide range of physiological functions, the contribution of 5-HT(1A) receptors to behavioural outcomes is difficult to define. In this study, we present a new transgenic mouse model with a prominent over-expression of the 5-HT(1A) receptor in the outer cortical layers (I-III) and the dentate gyrus. Behavioural studies revealed a slight decrease in baseline motor activity of homozygous mice during the open field test. Moreover, core body temperature of male transgenic mice was significantly lower than that of wild-type mice. Pharmacological studies with the 5-HT(1A) receptor agonist 8-OH-DPAT (0.1-2.5 mg/kg, i.p.) revealed an exaggerated drug response in mutant mice. 8-OH-DPAT led to a drastic decrease in motor activity in the open field and elevated plus maze test. This significant effect on motor activity became more apparent by investigating the serotonergic syndrome induced by 8-OH-DPAT. Concentration as low as 0.5 mg/kg 8-OH-DPAT caused immobility in transgenic mice for 30 min, head weaving behaviour, and backward walking, whereas in wild-type animals, typical behaviours of the serotonin syndrome were first observed at concentrations of 1.5 mg/kg and more. In addition, the 8-OH-DPAT induced hypothermia was more pronounced in mutant mice than in wild-type animals. Therefore, these genetically modified mice represent a promising model for further investigations of the role of 5-HT(1A) receptors.

Original publication

DOI

10.1016/j.bbr.2005.09.020

Type

Journal article

Journal

Behav Brain Res

Publication Date

28/02/2006

Volume

167

Pages

328 - 341

Keywords

8-Hydroxy-2-(di-n-propylamino)tetralin, Animals, Cerebral Cortex, Dentate Gyrus, Dose-Response Relationship, Drug, Exploratory Behavior, Female, Hypothermia, Immobility Response, Tonic, Male, Mice, Mice, Transgenic, Motor Activity, Receptor, Serotonin, 5-HT1A, Serotonin Receptor Agonists, Serotonin Syndrome