Endomorphin‐2 but not Leu‐enkephalin modulates spatial learning when microinjected in the CA3 region of the rat hippocampus
作者:
Johan Sandin,
Sven Ögren,
Lars Terenius,
期刊:
NeuroReport
(OVID Available online 2000)
卷期:
Volume 11,
issue 17
页码: 3659-3662
ISSN:0959-4965
年代: 2000
出版商: OVID
关键词: δ-receptor;Endomorphin-2;Learning;Leu-enkephalin;μ-receptor
数据来源: OVID
摘要:
The recently discovered endogenous δ-selective opioid peptide, endomorphin-2, and the endogenous δ-selective opioid peptide, Leu-enkephalin, were tested for their ability to affect spatial learning in the Morris water task. It was found that microinjection of 10 nmol endomorphin-2 into the CA3 region of the rat hippocampus significantly impaired spatial learning. However, the two lower doses tested, 3.3 and 1 nmol, had no effect in this test. Leu-enkephalin did not have any effect on spatial learning at the two doses tested (10 and 3.3 nmol). Neither peptide had any effect on motor performance as measured by swim speed. The results indicate that δ-receptors in the CA3 region of the rat hippocampus are more relevant than δ-receptors for spatial learning.
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