Abstract：
:Previous pharmacological experiments provide conflicting findings that describe both facilitatory and inhibitory effects of neuronal histamine on learning and memory. Here, we examined learning and memory and synaptic plasticity in mice with a null mutation of gene coding histamine H1 or H2 receptor in order to clarify the role of these receptors in learning and memory processes. Learning and memory were evaluated by several behavioral tasks including object recognition, Barnes maze and fear conditioning. These behavioral tasks are highly dependent on the function of prefrontal cortex, hippocampus or amygdala. Object recognition and Barnes maze performance were significantly impaired in both H1 receptor gene knockout (H1KO) and H2 receptor gene knockout (H2KO) mice when compared to the respective wild-type (WT) mice. Conversely, both H1KO and H2KO mice showed better auditory and contextual freezing acquisition than their respective WT mice. Furthermore, we also examined long-term potentiation (LTP) in the CA1 area of hippocampus in H1KO and H2KO mice and their respective WT mice. LTP in the CA1 area of hippocampus was significantly reduced in both H1KO and H2KO mice when compared with their respective WT mice. In conclusion, our results demonstrate that both H1 and H2 receptors are involved in learning and memory processes for which the frontal cortex, amygdala and hippocampus interact.
journal_name
Neurosci Resjournal_title
Neuroscience researchauthors
Dai H,Kaneko K,Kato H,Fujii S,Jing Y,Xu A,Sakurai E,Kato M,Okamura N,Kuramasu A,Yanai Kdoi
10.1016/j.neures.2006.10.020subject
Has Abstractpub_date
2007-02-01 00:00:00pages
306-13issue
2eissn
0168-0102issn
1872-8111pii
S0168-0102(06)00294-Xjournal_volume
57pub_type
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