All-optical reporting of chloride ion driving force in the nervous system

janelia7_blocks-janelia7_biblio_header | block

bioRxiv. 2023 Sep 01;. doi: 10.1101/2023.08.30.555464

All-optical reporting of chloride ion driving force in the nervous system Schreiter Lab

Selfe Joshua, Steyn Teresa, Shorer Eran, Burman Richard, Düsterwald Kira, Abdelfattah Ahmed, Schreiter Eric, Newey Sarah, Akerman Colin, Raimondo Joseph

janelia7_blocks-janelia7_biblio_abstract | block

Abstract

Ionic driving forces provide the net electromotive force for ion movement across membranes and are therefore a fundamental property of all cells. In the nervous system, chloride driving force (DFCl) determines inhibitory signaling, as fast synaptic inhibition is mediated by chloride-permeable GABAA and glycine receptors. Here we present a new tool for all-Optical Reporting of CHloride Ion Driving force (ORCHID). We demonstrate ORCHID’s ability to provide accurate, high-throughput measurements of resting and dynamic DFCl from genetically targeted cell types over a range of timescales. ORCHID confirms theoretical predictions about the biophysical mechanisms that establish DFCl, reveals novel differences in DFCl between neurons and astrocytes under different network conditions, and affords the first in vivo measurements of intact DFCl in mouse cortical neurons. This work extends our understanding of chloride homeostasis and inhibitory synaptic transmission and establishes a precedent for utilizing all-optical methods to assess ionic driving force.

node:body | entity_field

bioRxiv PrePrint https://doi.org/10.1101/2023.08.30.555464

Main Menu (Mobile)- Block

Main Menu - Block

All-optical reporting of chloride ion driving force in the nervous system

Abstract

Janelia Authors