Voltage sensitive dye imaging of transient neuronal assemblies in brain slices under hyperbaric conditions.
We have developed a high pressure optical cell to study large-scale transient neuronal coalitions--"assemblies" using voltage sensitive dye (VSD) fluorescence combined with fast CCD imaging of brain slices under hyperbaric conditions. The new cell has been tested at pressures up to P = 150...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2008
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| Summary: | We have developed a high pressure optical cell to study large-scale transient neuronal coalitions--"assemblies" using voltage sensitive dye (VSD) fluorescence combined with fast CCD imaging of brain slices under hyperbaric conditions. The new cell has been tested at pressures up to P = 150-200 atm, corresponding to the range over which effects such as "pressure-reversal" of anaesthesia have been described previously. Brain slices were maintained in a flow of artificial cerebrospinal fluid (aCSF) and hyperbaric conditions were controlled to within +/- 0.2 atm using a back-pressure regulator placed in the pumping system. Preliminary VSD imaging experiments were carried out on rat hippocampal slices at pressures up to P approximately 50 atm. An electrode placed in the CA3 region was used to stimulate a signal along the Schaffer collateral towards CA1. First results indicate that good VSD data can be obtained that can be analysed to provide a new view on how hydrostatic pressurisation affects the dynamic propagation of neuronal assemblies. |
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