Abstract
Rationale
We have proposed rewarded T-maze alternation as a model of obsessive–compulsive disorder (OCD): the serotonin agonist m-chlorophenylpiperazine (mCPP) increments persistence therein, while chronic pretreatment with selective serotonin reuptake inhibitor (SSRI fluoxetine) but not benzodiazepine or desipramine abolishes mCPP effects. However, we noted that acute SSRI administration also causes transient persistence increase, counteracted by mCPP pretreatment.
Objectives
This study (a) further explores the cross-tolerance between fluoxetine and mCPP and (b) extends the model by investigating its sensitivity to dopaminergic manipulations (D2, 3 agonism—quinpirole).
Materials and methods
In both experiments, baseline and drug testing were carried out under daily T-maze alternation training. Exp. 1: Matched group (n = 8) pairs of rats received one of the following 20-day pretreatments (daily intraperitoneal administration): (1) saline, (2) low-dose fluoxetine (2.5 mg/kg), (3) low-dose mCPP (0.5 mg/kg) or (4) combined fluoxetine + mCPP. One group per pretreatment then received a 4-day challenge with high-dose fluoxetine (10 mg/kg), the other with high-dose mCPP (2.5 mg/kg). Exp. 2: One group (n = 12) of rats received 20-day treatment with saline, another with quinpirole (0.5 mg/kg).
Results
Exp. 1: Saline and low-dose mCPP- or fluoxetine-pretreated animals showed significant persistence increases under both challenges, while combined low-dose fluoxetine + mCPP pretreatment afforded full protection from either challenge. Exp. 2: Quinpirole significantly increased directional persistence after 13 administration days.
Conclusions
These results establish the sensitivity of the rewarded alternation OCD model to D2, 3 receptor activation, thereby extending its profile of pharmacological isomorphism with OCD. Furthermore, they suggest a common mechanism of action of an SSRI and a serotonin agonist in the control of directional persistence.
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Acknowledgements
This work was supported by Grant 70/4/9100 from the Special Account for Research Grants, National and Kapodistrian University of Athens to Dr E. Tsaltas
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We would like to thank Pharmacerb-Lilly AEBE (Athens, Greece) for supplying the fluoxetine hydrochloride.
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Kontis, D., Boulougouris, V., Papakosta, V.M. et al. Dopaminergic and serotonergic modulation of persistent behaviour in the reinforced spatial alternation model of obsessive–compulsive disorder. Psychopharmacology 200, 597–610 (2008). https://doi.org/10.1007/s00213-008-1241-5
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DOI: https://doi.org/10.1007/s00213-008-1241-5