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Archives of Pharmacal Research

, Volume 33, Issue 7, pp 1049–1057 | Cite as

Pharmacological preconditioning by milrinone: Memory preserving and neuroprotective effect in ischemia-reperfusion injury in mice

  • Reetu Saklani
  • Amteshwar Jaggi
  • Nirmal SinghEmail author
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Abstract

We tested the neuroprotective effect of milrinone, a phosphodiesterase III inhibitor, in pharmacological preconditioning. Bilateral carotid artery occlusion for 12 min followed by reperfusion for 24 h produced ischemia-reperfusion (I/R) cerebral injury in male Swiss albino mice. Cerebral infarct size was measured using triphenyltetrazolium chloride staining. Memory was assessed using the Morris water maze test, and motor coordination was evaluated using the inclined beam walking test, rota-rod test, and lateral push test. Milrinone (50 μg/kg & 100 μg/kg i.v.) was administered 24 h before surgery in a separate group of animals to induce pharmacological preconditioning. I/R increased cerebral infarct size and impaired memory and motor coordination. Milrinone treatment significantly decreased cerebral infarct size and reversed I/R-induced impairments in memory and motor coordination. This neuroprotective effect was blocked by ruthenium red (3 mg/kg, s.c.), an intracellular ryanodine receptor blocker. These findings indicate that milrinone preconditioning exerts a marked neuroprotective effect on the ischemic brain, putatively due to increased intracellular calcium levels activating calcium-sensitive signal transduction cascades.

Key words

Milrinone Phosphodiesterase Pharmacological preconditioning Cerebral ischemia Ruthenium red Memory Morris water maze 

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Copyright information

© The Pharmaceutical Society of Korea and Springer Netherlands 2010

Authors and Affiliations

  1. 1.Department of Pharmaceutical Sciences and Drug ResearchPunjabi UniversityPatialaIndia
  2. 2.Department of Pharmaceutical Sciences and Drug ResearchPunjabi UniversityPatialaIndia

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