Effect of nilvadipine on the cerebral ischemia-induced impairment of spatial memory and hippocampal apoptosis in rats

Katsunori Iwasaki, Kenichi Mishima, Nobuaki Egashira, Izzettin Hatip Al-Khatib, Daisuke Ishibashi, Keiichi Irie, Hirotoshi Kobayashi, Takashi Egawa, Michihiro Fujiwara

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Abstract

We investigated the effects of nilvadipine and amlodipine on the cerebral ischemia-induced impairment of spatial memory in 8-arm radial maze performance and hippocampal CA1 apoptosis in rats. Single cerebral ischemia impaired memory without inducing apoptosis. In these rats, neither nilvadipine nor amlodipine at 3.2 mg/kg, i.p. improved the impaired memory. On the other hand, repeated cerebral ischemia (10 min ischemia × 2, 1 h interval) impaired spatial memory and induced hippocampal apoptosis 7 days after the final occlusion/reperfusion. Moreover, repeated ischemia increased the apoptotic cell number, an effect observed after 3 days and peaked after 7 days. However, mRNA expression of the apoptosis-related early oncogene bax and CPP 32 (caspase-3) was observed after 24 h. In these rats, nilvadipine, but not amlodipine, significantly improved memory, concomitantly decreased hippocampal apoptosis, and suppressed both bax and CPP 32 expression. These results suggest that nilvadipine improved the memory impairment in repeated ischemia by reducing bax and CPP 32 expression and suppressing the induction of apoptosis in the hippocampus. Nilvadipine may have a neuro-protective effect and could be a useful pharmacotherapeutic agent for cefebrovascular dementia.

Original languageEnglish
Pages (from-to)188-196
Number of pages9
JournalJournal of Pharmacological Sciences
Volume93
Issue number2
DOIs
Publication statusPublished - Oct 1 2003

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nilvadipine
Brain Ischemia
Apoptosis
Amlodipine
Ischemia
Oncogenes
Caspase 3
Reperfusion
Dementia
Spatial Memory
Hippocampus
Cell Count

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Pharmacology

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Effect of nilvadipine on the cerebral ischemia-induced impairment of spatial memory and hippocampal apoptosis in rats. / Iwasaki, Katsunori; Mishima, Kenichi; Egashira, Nobuaki; Al-Khatib, Izzettin Hatip; Ishibashi, Daisuke; Irie, Keiichi; Kobayashi, Hirotoshi; Egawa, Takashi; Fujiwara, Michihiro.

In: Journal of Pharmacological Sciences, Vol. 93, No. 2, 01.10.2003, p. 188-196.

Research output: Contribution to journalArticle

Iwasaki, K, Mishima, K, Egashira, N, Al-Khatib, IH, Ishibashi, D, Irie, K, Kobayashi, H, Egawa, T & Fujiwara, M 2003, 'Effect of nilvadipine on the cerebral ischemia-induced impairment of spatial memory and hippocampal apoptosis in rats', Journal of Pharmacological Sciences, vol. 93, no. 2, pp. 188-196. https://doi.org/10.1254/jphs.93.188
Iwasaki, Katsunori ; Mishima, Kenichi ; Egashira, Nobuaki ; Al-Khatib, Izzettin Hatip ; Ishibashi, Daisuke ; Irie, Keiichi ; Kobayashi, Hirotoshi ; Egawa, Takashi ; Fujiwara, Michihiro. / Effect of nilvadipine on the cerebral ischemia-induced impairment of spatial memory and hippocampal apoptosis in rats. In: Journal of Pharmacological Sciences. 2003 ; Vol. 93, No. 2. pp. 188-196.
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