Abstract
Rationale
Clinical studies suggest that the prevalence of psychiatric disorders is higher in diabetic patients than in the general population. It has been reported that central serotonin2A (5-HT2A) receptors may be involved in the pathogenesis and treatment of psychiatric disorders.
Objectives
We examined the effect of streptozotocin-induced diabetes on the function of central 5-HT2A receptors in mice.
Methods
Male ICR mice were rendered diabetic by an injection of streptozotocin (200 mg/kg, i.v.). The experiments were conducted 2 weeks after the injection of streptozotocin. To evaluate the central 5-HT2A receptor function, head-twitch responses were measured for 15 min immediately after the treatment with (±)-2,5-dimethoxy-4-iodoamphetamine (DOI) (0.1–1 mg/kg, s.c.), a selective 5-HT2 receptor agonist.
Results
Significantly fewer head-twitch responses were induced by DOI in diabetic mice than in non-diabetic mice. The number and affinity of 5-HT2A receptors in the mouse frontal cortex were not affected by diabetes. The corticosterone response to DOI (1 mg/kg and 3 mg/kg, s.c.) was not different between non-diabetic and diabetic mice, although the baseline of plasma corticosterone levels was significantly higher in diabetic than in non-diabetic mice.
Conclusions
Our results suggest that a neuronal network that causes head-twitch responses by triggering by the activation of 5-HT2A receptors may be altered by type-1 diabetes in mice.
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Miyata, S., Hirano, S. & Kamei, J. Diabetes inhibits the DOI-induced head-twitch response in mice. Psychopharmacology 177, 224–229 (2004). https://doi.org/10.1007/s00213-004-1942-3
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DOI: https://doi.org/10.1007/s00213-004-1942-3