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01 April 2004

Synergistic efficacy of magnesium sulfate and FK506 on cerebral ischemia-induced infarct volume in gerbil

Shu-Ying Chung, Jing-Ying Lin, Ming-Cheng Lin, Hui-Ming Liu, Ming-Fu Wang, Fu-Chou Cheng

Med Sci Monit 2004; 10(4): BR105-108 :: ID: 11617

Abstract

Background: In this study, we administered intraperitoneal magnesium sulfate (90 mg/kg), either alone or in combination with FK506 (0.5 mg/kg) in order to investigate the neuroprotective synergetic effects of both, 30 min before permanent occlusion of the middle cerebral artery (MCA) in gerbil.
Material/Methods: Postmortem infarct volume was determined by quantitative image analysis of triphenyltetrazolium-stained brain sections, collected at 1h, 3h and 24h after initiation of cerebral ischemia, to measure consistent infarct volumes of the post -ischemic gerbil brain. Twenty-four male gerbils were intraperitoneally injected with MgSO[sub]4[/sub] (n=7), FK506 (n=8), or MgSO[sub]4[/sub] +FK506 (n=9), 30 min before permanent MCA occlusion. The brains of the treated groups were stained at 24h after initiation of cerebral ischemia.
Results: Significant and consistent infarct volumes (78.3I3.6 mm3) were observed in the 24 H control group. The infarct volume in the MgSO[sub]4[/sub] + FK506 group was significantly reduced at each slice, compared to the untreated 24H control group (P<0.05). Magnesium sulfate reduced total infarct volume by 25.4% (P<0.05), FK506 by 41% (P<0.05), and MgSO4 +FK506 by 50.5% (P<0.05). Also, the infarct volume (38.7I5.2 mm3) in the MgSO4 + FK506 group was the smallest in all the treated groups, near the volumes seen in the untreated 3H group.
Conclusions: Acute administration of a combination of Mg SO4 and FK506 has a synergetic efficacy against brain damage by permanent focal cerebral ischemia.

Keywords: Cerebellum - drug effects, Cerebellum - pathology, Cerebral Infarction - drug therapy, Cerebral Infarction - pathology, Drug Synergism, Gerbillinae, Immunosuppressive Agents - pharmacology, Magnesium Sulfate - pharmacology, Tacrolimus - pharmacology, Cerebellum - pathology, Cerebral Infarction - pathology, Drug Synergism, Gerbillinae, Immunosuppressive Agents - pharmacology, Magnesium Sulfate - pharmacology, Tacrolimus - pharmacology

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750