Therapeutic time window and dose dependence of neuroprotective effects of sodium orthovanadate following transient middle cerebral artery occlusion in rats

Yu Hasegawa, Motohiro Morioka, Shu Hasegawa, Jun Matsumoto, Takayuki Kawano, Yutaka Kai, Shigetoshi Yano, Kohji Fukunaga, Jun Ichi Kuratsu

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Vanadium is widely distributed in the environment and exhibits various biological and physiological effects in the human body. We previously documented the neuroprotective effect of sodium orthovanadate (SOV) against in rodents i.v. injected with 2 ml/kg 50 mM SOV just after the induction of middle cerebral artery occlusion (MCAO; 0 min post-MCAO). To evaluate its potential clinical use, we determined here therapeutic time window (0, 45, and 90 min post-MCAO) and the neuroprotective dose (2 ml/kg, 12.5, 25, 37.5, and 50 mM) of SOV in rats. A single injection of 50 mM SOV at 0 or 45 min post-MCAO produced similar neuroprotective effects, and even 50 mM delivered 90 min post-MCAO exerted significant neuroprotection. Although the maximal neuroprotective effect was obtained at 50 mM SOV, 25 mM injected once and 12.5 mM delivered at 0 and 45 min post-MCAO significantly reduced the infarct volume. We also documented that SOV treatment ameliorates ischemic neuronal cell injury via the activation of both protein kinase B (Akt) and extracellular signal-regulated kinase (ERK), inhibits serum glucose, and elicits the gradual recovery of regional cerebral blood flow (rCBF) after transient MCAO in rats. To elucidate the important factor(s) involved in the neuronal protection afforded by SOV, we measured Akt and ERK activity, physiological parameters, blood glucose levels, and rCBF following various SOV treatments. In conclusion, Akt activation was the most important factor in SOV-induced neuroprotection; ERK activation, the gradual recovery of rCBF, and decreased blood glucose were weak contributors.

本文言語English
ページ(範囲)875-881
ページ数7
ジャーナルJournal of Pharmacology and Experimental Therapeutics
317
2
DOI
出版ステータスPublished - 2006 5 1

ASJC Scopus subject areas

  • 分子医療
  • 薬理学

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