2006 Fiscal Year Final Research Report Summary
Basic study on depressive disorder in diabetes
| Project/Area Number |
17590127
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Medical pharmacy
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| Research Institution | Ehime University |
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Principal Investigator |
ARAKI Hiroaki Ehime University, University Hospital, Professor, 医学部附属病院, 教授 (50294450)
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| Co-Investigator(Kenkyū-buntansha) |
SUEMARU Katsuya Ehime University, University Hospital, Associate Professor, 医学部附属病院, 助教授 (50363239)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Hyperglycemia / Adrenocorticotropic hormone / Depression / Streptozotocin / c-Fos / Serotonin / BDNF / Stress |
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| Research Abstract |
Several epidemiological and clinical studies have indicated that the prevalence of psychiatric disorders is higher in diabetic patients than in the general population. In the present studies, we examined the behavioral changes in streptozotocin-induced diabetic rats, and investigated the effects of physical and psychological stress on the hippocampal BDNF levels and on the serotonin 2A (5-HT2A) receptor-mediated wet-dog shake responses. The streptozotocin (60 mg/kg, i.p.)-induced diabetes had no significant effects on the immobility time in the forced swim test or on locomotor activity in the open-field test Moreover, there was no significant difference in the wet-dog shake responses induced by DOI, a 5-HT2A receptor agonist, between nondiabetic and diabetic rats. Five-day exposure to physical (electric footshock) and psychological (non-footshock) stress had no significant effect on the hippocampal BDNF level in diabetic or nondiabetic rats. The two types of stress had no significant effect on the DOI-induced wet-dog shake responses in nondiabetic rats. In diabetic rats, the repeated exposure to physical stress markedly increased the DOI-induced wet-dog shake responses, but the repeated exposure to psychological stress had no effect These results suggest that exposure to physical stress augmented the susceptibility to the wet-dog shake responses to 5-HT2A receptor stimulation in streptozotocin-induced diabetic rats.
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