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Determination of zeta-potential in rat organotypic hippocampal cultures.
- Guy, Yifat (author)
-
- Sandberg, Mats, 1953 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi,Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology
- Weber, Stephen G (author)
- (creator_code:org_t)
- Elsevier BV, 2008
- 2008
- English.
- In: Biophysical journal. - : Elsevier BV. - 1542-0086 .- 0006-3495. ; 94:11, s. 4561-9
- Journal article (peer-reviewed)
Abstract
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- zeta-potentials of entities such as cells and synaptosomes have been determined, but zeta of brain tissue has never been measured. Electroosmotic flow, and the resulting transport of neuroactive substances, would result from naturally occurring and experimentally or clinically induced electric fields if zeta is significant. We have developed a simple method for determining zeta in tissue. An electric field applied across a rat organotypic hippocampal slice culture (OHSC) drives fluorescent molecules through the tissue by both electroosmotic flow and electrophoresis. Fluorescence microscopy is used to determine each molecule's velocity. Independently, capillary electrophoresis is used to measure the molecules' electrophoretic mobilities. The experiment yields zeta-potential and average tissue tortuosity. The zeta-potential of OHSCs is -22 +/- 2 mV, and the average tortuosity is 1.83 +/- 0.06. In a refined experiment, zeta-potential is measured in various subregions. The zeta-potentials of the CA1 stratum pyramidale, CA3 stratum pyramidal, and dentate gyrus are -25.1 +/- 1.6 mV, -20.3 +/- 1.7 mV, and -25.4 +/- 1.0 mV, respectively. Simple dimensional arguments show that electroosmotic flow is potentially as important as diffusion in molecular transport.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Cell- och molekylärbiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Cell and Molecular Biology (hsv//eng)
Keyword
- Animals
- Biological Transport
- Active
- physiology
- Cells
- Cultured
- Diffusion
- Electromagnetic Fields
- Hippocampus
- chemistry
- physiology
- Microscopy
- Fluorescence
- methods
- Rats
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- ref (subject category)
- art (subject category)
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