All-optical reporting of inhibitory receptor driving force in the nervous system

Joshua S. Selfe, Teresa J. S. Steyn, Eran F. Shorer, Richard J. Burman, Kira M. Düsterwald, Ariel Z. Kraitzick, Ahmed S. Abdelfattah, Eric R. Schreiter, Sarah E. Newey, Colin J. Akerman and Joseph V. Raimondo ()
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Joshua S. Selfe: University of Cape Town
Teresa J. S. Steyn: University of Cape Town
Eran F. Shorer: University of Cape Town
Richard J. Burman: University of Oxford
Kira M. Düsterwald: University of Cape Town
Ariel Z. Kraitzick: University of Cape Town
Ahmed S. Abdelfattah: Brown University
Eric R. Schreiter: Howard Hughes Medical Institute
Sarah E. Newey: University of Oxford
Colin J. Akerman: University of Oxford
Joseph V. Raimondo: University of Cape Town

Nature Communications, 2024, vol. 15, issue 1, 1-18

Abstract: Abstract Ionic driving forces provide the net electromotive force for ion movement across receptors, channels, and transporters, and are a fundamental property of all cells. In the nervous system, fast synaptic inhibition is mediated by chloride permeable GABAA and glycine receptors, and single-cell intracellular recordings have been the only method for estimating driving forces across these receptors (DFGABAA). Here we present a tool for quantifying inhibitory receptor driving force named ORCHID: all-Optical Reporting of CHloride Ion Driving force. We demonstrate ORCHID’s ability to provide accurate, high-throughput measurements of resting and dynamic DFGABAA from genetically targeted cell types over multiple timescales. ORCHID confirms theoretical predictions about the biophysical mechanisms that establish DFGABAA, reveals differences in DFGABAA between neurons and astrocytes, and affords the first in vivo measurements of intact DFGABAA. This work extends our understanding of inhibitory synaptic transmission and demonstrates the potential for all-optical methods to assess ionic driving forces.

Date: 2024
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DOI: 10.1038/s41467-024-53074-y

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