Blocking histamine H(1) improves learning and mnemonic dysfunction in mice with social isolation plus repeated methamphetamine injection.
The aim of this study was to investigate the effects of histamine H(1) and H(3) antagonists on learning and mnemonic dysfunction in mice. Two H(1) antagonists, pyrilamine and clozapine, and the prototypic H(3) antagonist thioperamide were used to study the role of histamine in mice with social isolation and repeated methamphetamine administration. Mice with social isolation and repeated methamphetamine administration showed significant disruption of prepulse inhibition as compared to both the socially-housed mice and isolation-housing mice. Furthermore, social isolation and repeated methamphetamine administration caused significant learning and mnemonic dysfunctions. Treatment with clozapine improved learning and mnemonic ability in all of the tasks. Pyrilamine treatment ameliorated performance in all the tests examined except for the passive avoidance test. Thioperamide, however, did not change the learning and mnemonic ability. Donepezil, an acetylcholinesterase inhibitor, reversed the learning and mnemonic dysfunction in all four tasks. The present study has shown that blockade of histamine H(1) receptor improved the learning and mnemonic ability in mice, raising the possibility that treatment with clozapine or pyrilamine may improve learning and mnemonic performance in certain patients with psychiatric diseases such as schizophrenic patients with cognitive dysfunction.
Jia
Feiyong
F
Department of Pharmacology, Tohoku University School of Medicine, Sendai, Japan.
Mobarakeh
Jalal Izadi
JI
Dai
Hongmei
H
Kato
Motohisa
M
Xu
Ajing
A
Okuda
Tomohiro
T
Sakurai
Eiko
E
Okamura
Nobuyuki
N
Takahashi
Kazuhiro
K
Yanai
Kazuhiko
K
D000818:Animals; D001362:Avoidance Learning; D005239:Fear; D006634:Histamine H1 Antagonists / Q000627:therapeutic use*; D007859:Learning Disabilities / Q000188:drug therapy* / Q000209:etiology; D008297:Male; D018782:Maze Learning; D008569:Memory Disorders / Q000188:drug therapy* / Q000209:etiology; D008694:Methamphetamine / Q000633:toxicity*; D051379:Mice; D008813:Mice, Inbred ICR; D013216:Reflex, Startle; D012934:Social Isolation
D006634:Histamine H1 Antagonists; D008694:Methamphetamine