Source Paper
Chronic Stress Induces Impairment of Spatial Working Memory Because of Prefrontal Dopaminergic Dysfunction
Kazushige Mizoguchi, Mitsutoshi Yuzurihara, Atsushi Ishige, Hiroshi Sasaki, De-Hua Chui et al.
Journal of Neuroscience • 2000
Chronic Stress Protocol
Objective: Examine whether chronically stressed and recovered rats show working memory impairment caused by reduced dopamine transmission in the prefrontal cortex, and evaluate the role of D1 receptor-mediated mechanisms
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Protocol Steps
Chronic stress administration
Administer chronic stress to rats through water immersion and restraint procedures
Note: This stress protocol has been previously reported to induce organic disorder such as hippocampal neuronal degeneration
View evidence from paper
“chronic stress administered by water immersion and restraint for 4 weeks induces a organic disorder such as hippocampal neuronal degeneration”
Recovery period
Allow chronically stressed rats to recover without further stress administration
Note: Recovery period follows the 4-week chronic stress period
View evidence from paper
“chronically stressed (4 weeks) and recovered (10 d) rats show a working memory impairment”
Spatial working memory evaluation
Evaluate spatial working memory in chronically stressed and recovered rats using T-maze task
Note: This assessment measures the effects of chronic stress on cognitive function
View evidence from paper
“The stress impaired the spatial working memory evaluated by T-maze task”
Intra-PFC infusion of D1 receptor agonist
Administer SKF 81297 directly into the prefrontal cortex to test D1 receptor-mediated dopaminergic function
Note: This treatment ameliorates the working memory impairment induced by chronic stress
View evidence from paper
“working memory impairment was sufficiently ameliorated by intra-PFC infusion of 10 ng SKF 81297, a D1 receptor-specific agonist”
Pretreatment with D1 receptor antagonist
Administer SCH 23390 via intraperitoneal injection prior to SKF 81297 infusion to block D1 receptor effects
Note: This pretreatment reverses the ameliorative effects of SKF 81297, confirming D1 receptor involvement
View evidence from paper
“Pretreatment with intraperitoneal injection of 20 μg/kg SCH 23390, a D1 receptor antagonist, reversed the SKF 81297 response”