Memantine reduces hematoma expansion in experimental intracerebral hemorrhage, resulting in functional improvement

J Cereb Blood Flow Metab. 2006 Apr;26(4):536-44. doi: 10.1038/sj.jcbfm.9600213.

Abstract

Glutamate is accumulated in abundance during the early period of experimental hematoma, and the activation of N-methyl-D-aspartate (NMDA) receptors by glutamate can result in an influx of calcium and neuronal death in cases of intracerebral hemorrhage (ICH). Memantine, which is known to be a moderate-affinity, uncompetitive, NMDA receptor antagonist, was investigated with regard to its ability to block the glutamate overstimulation and tissue plasminogen activator (tPA)/urokinase plasminogen activator (uPA)/matrix metalloproteinase (MMP)-9 modulation in experimental ICH. Intracerebral hemorrhage was induced via the infusion of collagenase into the left basal ganglia of adult rats. Either memantine (20 mg/kg/day) or PBS was intraperitoneally administered 30 min after the induction of ICH, and, at daily intervals afterwards, for either 3 or 14 days. Hemorrhage volume decreased by 47% in the memantine group, as compared with the ICH-only group. In the memantine group, the numbers of TUNEL+, myeloperoxidase (MPO)+, and OX42+ cells decreased in the periphery of the hematoma. Memantine resulted in an upregulation of bcl-2 expression and an inhibition of caspase-3 activation. Memantine also exerted a profound inhibitory effect on the upregulation of tPA/uPA mRNA, and finally decreased the MMP-9 level in the hemorrhagic brain. In modified limb-placing test, the memantine-treated rats exhibited lower scores initially, and recovered more quickly and thoroughly throughout the 35 days of the study. Here, we show that memantine causes a reduction of hematoma expansion, coupled with an inhibitory effect on the tPA/uPA and MMP-9 level. Subsequently, memantine was found to reduce inflammatory infiltration and apoptosis, and was also determined to induce functional recovery after ICH.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cerebral Hemorrhage / drug therapy*
  • Disease Models, Animal
  • Gene Expression Regulation / drug effects
  • Hematoma / drug therapy*
  • Male
  • Matrix Metalloproteinases / analysis
  • Memantine / administration & dosage
  • Memantine / pharmacology*
  • RNA, Messenger / genetics
  • Rats
  • Rats, Sprague-Dawley
  • Tissue Plasminogen Activator / genetics
  • Treatment Outcome
  • Urokinase-Type Plasminogen Activator / genetics

Substances

  • RNA, Messenger
  • Tissue Plasminogen Activator
  • Urokinase-Type Plasminogen Activator
  • Matrix Metalloproteinases
  • Memantine