2001 Fiscal Year Final Research Report Summary
Effect of occlusal interferences on dopamine release of prefrontal cortex in rats
| Project/Area Number |
12671915
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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 |
補綴理工系歯学
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| Research Institution | Osaka Dental University |
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Principal Investigator |
INOUE Hiroshi Osaka Dental University, Dentistry, Professor, 歯学部, 教授 (30067053)
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| Co-Investigator(Kenkyū-buntansha) |
KUREMOTO Koichi Osaka Dental University, Dentistry, Lecturer, 歯学部, 助手 (90319583)
UEDA Yutaka Osaka Dental University, Dentistry, Professor, 歯学部, 教授 (10067001)
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| Project Period (FY) |
2000 – 2001
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| Keywords | occlusal interference / dopamine / microdialysis method / stress / feeding / benzodiazepine / prefrontal cortex / rat |
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| Research Abstract |
We measured dopamine release from the prefrontal cortex of rats with occlusal interferences in order to clarify the relation between the occlusal interferences and psychiatric stress. Changes in the activity of the dopaminergic neuron system of the prefrontal cortex have been found to be an index of stress responses involved in anxiety and so on. We used benzodiazepine (diazepam) in this experiment to show whether increased dopamine release was caused by psychiatric stress.
Dopamine release was measured using microdialysis in three experiments. In each experiment, a control group comprised 6 rats and an occlusal interference group comprised 6 rats. The level of dopamine release was measured for each experiment : We measured it before and after feeding pellets in experiment 1. Diazepam was intraperitoneally administered before the rats were fed pellets in experiment 2. Physiological saline was given to the rats before they Were fed pellets in experiment 3.
Experiment 1: In the occlusal interference group only, the amount of dopamine release significantly increased after feeding, Experiment 2 : The amount of dopamine release did not significantly increase in either group. Experiment 3 : In the occlusal interference group only, the amount of dopamine release significantly increased after feeding.
The amount of dopamine release increased by occlusal interference when rats had been fed. Diazepam suppressed this increase, but physiological saline did not. These results proved statistically that occlusal interferences related to psychiatric stress involved in anxiety.
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