Injection of galanin into the dorsal hippocampus impairs emotional memory independent of 5-HT1A receptor activation
| Autor: | Sven Ove Ögren, Eugenia Kuteeva, Tomas Hökfelt, Oliver Stiedl |
|---|---|
| Přispěvatelé: | Center for Neurogenomics and Cognitive Research |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Agonist
medicine.medical_specialty endocrine system Serotonin medicine.drug_class Hippocampus Neuropeptide Neurotransmission Serotonergic 03 medical and health sciences Behavioral Neuroscience 0302 clinical medicine SDG 3 - Good Health and Well-being Internal medicine medicine Learning Galanin Receptor 030304 developmental biology 0303 health sciences Chemistry digestive oral and skin physiology Fear Emotional memory Endocrinology nervous system 5-HT1A receptor 030217 neurology & neurosurgery hormones hormone substitutes and hormone antagonists |
| Zdroj: | Stiedl, O, Kuteeva, E, Hökfelt, T & Ögren, S O 2021, ' Injection of galanin into the dorsal hippocampus impairs emotional memory independent of 5-HT 1A receptor activation ', Behavioural Brain Research, vol. 405, 113178, pp. 1-9 . https://doi.org/10.1016/j.bbr.2021.113178 Behavioural Brain Research, 405:113178, 1-9. Elsevier |
| ISSN: | 0166-4328 |
| Popis: | There is evidence that interaction between the neuropeptide galanin and the 5-HT1A receptor represents an integrative mechanism in the regulation of serotonergic neurotransmission. Thus, in rats intracerebroventricular (i.c.v.) galanin did not impair retention in the passive avoidance (PA) test 24 h after training, but attenuated the retention deficit caused by subcutaneous (s.c.) administration of the 5-HT1A receptor agonist 8-OH-DPAT. This impairment has been linked to postsynaptic 5-HT1A receptor activation. To confirm these results in mice, galanin was infused i.c.v. (1 nmol/mouse) in C57BL/6/Bkl mice 30 min prior to training followed by s.c. injection (0.3 mg/kg) of 8-OH-DPAT or saline 15 min before PA training. In line with previous results, i.c.v. galanin significantly attenuated the PA impairment caused by 5-HT1A receptor activation in mice. To study if the galanin 5-HT1A receptor interaction involved the dorsal hippocampus, galanin (1 nmol/mouse) was directly infused into this brain region alone or in combination with s.c. 8-OH-DPAT. However, unlike i.c.v. galanin, galanin infusion into the dorsal hippocampus alone impaired PA retention and failed to attenuate the 8-OH-DPAT-mediated PA impairment. These results indicate that the ability of i.c.v. galanin to modify 5-HT1A receptor activation is not directly mediated via receptor interactions in the dorsal hippocampus. Instead, the galanin-mediated PA impairment suggests an important inhibitory role of galanin receptors in the dorsal hippocampus for acquisition (encoding) and/or consolidation of emotional memory. In addition, the interaction between galanin and 5-HT1A receptors probably involves a wide serotonergic network that is important for the integration of emotional and cognitive behaviors. |
| Databáze: | OpenAIRE |
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