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Related Experiment Videos

Neuroprotection by MK-801 in temperature maintained gerbils

C A Hoffman1, C A Boast

  • 1Wyeth-Ayerst Research, Princeton, NJ 08543, USA.

Brain Research Bulletin
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Hypothermia confounds drug effects on brain injury. MK-801 shows neuroprotection in gerbils, but only when body temperature is normothermic (36.5°C), not hyperthermic (38.5°C).

Area of Science:

  • Neuroscience
  • Pharmacology
  • Ischemic Stroke Research

Background:

  • Hypothermia is known to reduce ischemic brain damage.
  • The neuroprotective drug MK-801 can induce hypothermia, complicating the assessment of its effects.
  • Conflicting studies exist on whether MK-801's neuroprotective properties persist when body temperature is controlled.

Purpose of the Study:

  • To evaluate the neuroprotective effects of MK-801 in gerbils under controlled body temperature conditions.
  • To determine if MK-801 confers neuroprotection independently of its hypothermic effects.
  • To investigate the dose-dependency and temperature-sensitivity of MK-801's neuroprotective actions.

Main Methods:

  • Gerbils underwent bilateral carotid occlusion for 5 or 10 minutes.

Related Experiment Videos

  • MK-801 was administered intraperitoneally at various doses (3-10 mg/kg).
  • Body temperature was either free-regulating or maintained at hyperthermic (38.5°C) or normothermic (36.5°C) levels.

    • Main Results:

    • In free-regulating animals, MK-801 (3 mg/kg) showed neuroprotection after 10 min of ischemia, coinciding with significant hypothermia.
    • No neuroprotection was observed with MK-801 (up to 10 mg/kg) at hyperthermic temperatures (38.5°C), even with reduced ischemia.
    • MK-801 (10 mg/kg) significantly reduced brain damage at normothermic temperatures (36.5°C) after 5 min of ischemia.

    Conclusions:

    • MK-801 can reduce ischemic brain damage independently of hypothermia, but requires higher doses.
    • The findings suggest that mechanisms beyond NMDA receptor antagonism may contribute to MK-801's neuroprotective effects.
    • Controlled temperature is crucial for accurately assessing drug efficacy in models of ischemic brain injury.