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Intrinsic Cell-Class-Specific Modulation of Intracellular Chloride Levels and Inhibitory Function, in Cortical

Laura Alberio1, Amy Marshall1, Robert T Graham1

  • 1Faculty of Medical Science, Biosciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom.

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Summary
This summary is machine-generated.

Daily changes in brain cell chloride levels vary between neuron types. Parvalbumin interneurons show out-of-phase chloride shifts compared to pyramidal cells, suggesting cell-intrinsic regulation influences brain states.

Keywords:
chlorideinterneuronneocortexparvalbuminpyramidal cellsomatostatin

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Area of Science:

  • Neuroscience
  • Cellular Physiology

Background:

  • Recent studies reveal significant daily fluctuations in intracellular chloride concentration ([Cl-]in) in cortical pyramidal cells.
  • These [Cl-]in variations impact GABAergic function and neuronal network excitability.
  • A key hypothesis suggests these changes stem from variations in presynaptic drive, predicting correlated ionic shifts in neurons with similar inputs.

Purpose of the Study:

  • To investigate the daily modulation of intracellular chloride concentration ([Cl-]in) in parvalbumin (PV) and somatostatin (SST) interneurons.
  • To compare the [Cl-]in dynamics of these interneurons with those of cortical pyramidal cells in vivo.
  • To determine the relative contributions of activity-dependent versus cell-intrinsic factors in regulating daily ionic redistribution patterns.

Main Methods:

  • In vivo LSSm-ClopHensor imaging was used to measure [Cl-]in and intracellular pH (pHin) in Layer 2/3 cortical interneurons of adult mice.
  • Measurements were taken at two distinct time points: Zeitgeber time (ZT)5 and ZT17, corresponding to maximal divergence in pyramidal cell [Cl-]in.
  • In vitro assays assessed GABAergic inhibition mediated by PV and SST interneurons at ZT5 and ZT17.

Main Results:

  • PV interneurons exhibited substantial daily [Cl-]in modulation, distinct from pyramidal cells, showing higher levels at ZT5 and lower levels at ZT17.
  • SST interneurons displayed less [Cl-]in modulation, with greater variance and a temporal pattern similar to pyramidal cells.
  • In vitro inhibition assays revealed significant differences between ZT5 and ZT17 for both PV and SST interneurons.

Conclusions:

  • The distinct and out-of-phase [Cl-]in dynamics in PV interneurons compared to pyramidal cells challenge the presynaptic drive hypothesis.
  • The persistence of time-of-day effects in vitro and differing dynamics in vivo suggest cell-intrinsic regulation is a primary driver of these daily ionic shifts.
  • These findings highlight the complex, cell-type-specific regulation of brain states through daily ionic redistribution.