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Calcium compartments in brain.

George C Newman1, Frank E Hospod, Clifford S Patlak

  • 1Department of Neurology, State University of New York, Stony Brook, New York 11794-8121, USA.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|March 29, 2002
PubMed
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This study quantifies brain calcium compartments using advanced methods, revealing at least five distinct pools crucial for understanding calcium buffering in the hippocampus.

Area of Science:

  • Neuroscience
  • Cellular Physiology
  • Biochemistry

Background:

  • Understanding brain calcium kinetics is crucial for cellular processes.
  • Previous studies lacked an integrated view of brain calcium compartments.

Purpose of the Study:

  • To determine the size and binding properties of brain calcium compartments.
  • To provide an integrated view of brain calcium kinetics.

Main Methods:

  • Experiments on hippocampal brain slices exposed to varying extracellular calcium levels (0.001 to 4.5 mmol/L).
  • Analysis of slice calcium content using 45Ca exchange equilibrium, synchrotron-radiation-induced x-ray emission, and inductively coupled plasma.
  • Data analysis with a model based on a Langmuir isotherm for independent sites, extracellular, and bound compartments.

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Main Results:

  • Identified at least five kinetically distinct calcium compartments: free extracellular, loosely associated extracellular plasma membrane, intracellular moderate avidity, tightly bound intracellular, and free cytoplasmic.
  • Calculated buffering ratios of approximately 2,700:1 (including compartment 3) or 13,000:1 (including compartments 2 and 3).
  • Observed minimal effects of altered low calcium on slice histology and adenylates.

Conclusions:

  • The diverse calcium compartments and high buffering capacity may explain varied estimates from fluorescent probe studies.
  • This detailed kinetic model enhances understanding of brain calcium dynamics.
  • Provides a quantitative framework for brain calcium compartment analysis.