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Working memory failure by stimulation of hippocampal adenosine A1 receptors in rats
1Department of Pharmocology, Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan.
Insights
Activating adenosine A1 receptors in the hippocampus impairs working memory. Blocking these receptors prevents this impairment, suggesting a key role for adenosine A1 receptors in memory function.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- The hippocampus plays a crucial role in working memory.
- Adenosine receptors are involved in modulating neuronal activity and cognitive functions.
Purpose of the Study:
- To investigate the role of hippocampal adenosine A1 and A2 receptors in working memory.
- To determine if selective activation or antagonism of adenosine receptors affects working memory performance.
Main Methods:
- Intrahippocampal administration of selective adenosine A1 receptor agonist N6-cyclohexyladenosine (CHA) and antagonist 1,3-dipropyl-8-cyclopentylxanthine (DPCPX).
- Intrahippocampal administration of selective adenosine A2 receptor agonist CGS-21680.
- Assessment of working memory performance using a spatial task with a three-panel runway setup.
Main Results:
- N6-cyclohexyladenosine (CHA) significantly increased working memory errors at doses of 0.3 and 1.0 microgram per side.
- Pretreatment with 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) blocked the memory-impairing effects of CHA.
- CGS-21680, an adenosine A2 receptor agonist, had no significant effect on working memory errors.
Conclusions:
- Activation of hippocampal adenosine A1 receptors negatively impacts working memory function.
- Adenosine A1 receptors are critically involved in the neural processes underlying working memory.
- Selective modulation of adenosine A1 receptors represents a potential therapeutic target for cognitive disorders.
Abstract:
THE highly selective adenosine A1 receptor agonist N6-cyclohexyladenosine (CHA) significantly increased the number of errors (attempts to pass through two incorrect panels of the three panel-gates at four choice points) in the working memory task with a three-panel runway setup, when injected bilaterally at 0.3 and 1.0 microgram per side into the dorsal hippocampus. Pretreatment with the selective adenosine A1 receptor antagonist 1,3-dipropyl-8-cyclopentylxanthine (DPCPX; 1 mg kg-1, i.p.) prevented the increase in working memory errors induced by intrahippocampal administration of CHA (1.0 microgram per side). CGS-21680, a highly selective agonist for adenosine A2 receptors, had no effect on the number of working memory errors, when administered intrahippocampally at a dose of 1.0 microgram per side. These results suggest that activation of hippocampal adenosine A1 receptors interferes with neural processes involved in working memory function.