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Related Experiment Videos

Flow threshold for enhanced phorbol ester binding in the ischemic gerbil brain

K Tanaka1, Y Fukuuchi, S Gomi

  • 1Department of Neurology, School of Medicine, Keio University, Tokyo, Japan.

Neurochemical Research
|September 1, 1995
PubMed
Summary

Reduced cerebral blood flow (CBF) during ischemia triggers protein kinase C (PKC) translocation in vulnerable brain regions like the hippocampus. This PKC activation occurs when CBF drops below 35-40 ml/100 g/min.

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Area of Science:

  • Neuroscience
  • Cerebrovascular Research
  • Molecular Biology

Background:

  • Ischemia-induced brain damage involves complex molecular signaling pathways.
  • Protein Kinase C (PKC) is implicated in cellular responses to stress, including ischemia.
  • Understanding regional changes in PKC activity during cerebral ischemia is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the correlation between regional cerebral blood flow (CBF) and phorbol ester binding, a marker for PKC translocation, in a gerbil model of ischemic stroke.
  • To identify specific brain regions exhibiting altered PKC activity in response to reduced CBF.
  • To determine the threshold of CBF reduction that initiates PKC translocation.

Main Methods:

  • Utilized a 2-hour unilateral common carotid artery occlusion model in gerbils.

Related Experiment Videos

  • Employed quantitative autoradiography for concurrent measurement of [3H]phorbol 12,13-dibutyrate (PDBu) binding and [14C]iodoantipyrine to assess CBF.
  • Analyzed PDBu binding and CBF in various brain regions, including the hippocampus, caudate-putamen, thalamus, and cerebral cortices.

    • Main Results:

    • A significant inverse correlation between CBF and PDBu binding was observed in the hippocampus, caudate-putamen, and lateral thalamic nuclei.
    • PDBu binding increased progressively in these vulnerable regions as CBF decreased below 35-40 ml/100 g/min.
    • Cerebral cortical PDBu binding remained unchanged even with CBF reductions below 35 ml/100 g/min.

    Conclusions:

    • PKC translocation in response to ischemia is regionally specific, occurring in areas highly susceptible to blood flow reduction.
    • The identified CBF threshold of 35-40 ml/100 g/min suggests a critical point for PKC activation in vulnerable brain regions during early ischemic phases.
    • These findings highlight the regional sensitivity of PKC signaling to ischemic conditions and provide insights into early molecular events in stroke pathophysiology.