Abstract:
:The effects of histamine H(1) receptor antagonists (promethazine, diphenhydramine, chlorphenilamine and triprolidine) on hippocampal theta rhythm during eight-arm radial maze performance were investigated using rats. Promethazine showed a significant increase in the number of total errors and working memory errors at doses of 10 and 20 mg/kg, and a significant increase was also observed in reference memory errors at a dose of 20 mg/kg. Diphenhydramine and chlorphenilamine at a dose of 20 mg/kg and triprolidine at a dose of 35 mg/kg also caused significant increases in the number of total, reference memory and working memory errors. Promethazine, diphenhydramine and chlorphenilamine, having potent anti-muscarinic receptor properties, increased hippocampal theta power during radial maze performance at a dose of 20 mg/kg. On the other hand, triprolidine, which has weak anti-muscarinic receptor properties compared with other histamine H(1) receptor antagonists, decreased theta power at a dose of 35 mg/kg. These results suggest that anti-muscarinic receptor properties rather than anti-histamine H(1) receptor properties may affect hippocampal theta power during spatial memory deficit induced by promethazine, diphenhydramine and chlorphenilamine.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Masuoka T,Mikami A,Yasuda M,Shinomiya K,Kamei Cdoi
10.1016/j.ejphar.2007.08.020subject
Has Abstractpub_date
2007-12-08 00:00:00pages
77-82issue
1-3eissn
0014-2999issn
1879-0712pii
S0014-2999(07)00928-4journal_volume
576pub_type
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