Features of hippocampal astrocytic domains and their spatial relation to excitatory and inhibitory neurons

Ron Refaeli, Adi Doron, Aviya Benmelech-Chovav, Maya Groysman, Tirzah Kreisel, Yonatan Loewenstein, Inbal Goshen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The mounting evidence for the involvement of astrocytes in neuronal circuits function and behavior stands in stark contrast to the lack of detailed anatomical description of these cells and the neurons in their domains. To fill this void, we imaged >30,000 astrocytes in hippocampi made transparent by CLARITY, and determined the elaborate structure, distribution, and neuronal content of astrocytic domains. First, we characterized the spatial distribution of >19,000 astrocytes across CA1 lamina, and analyzed the morphology of thousands of reconstructed domains. We then determined the excitatory somatic content of CA1 astrocytes, and measured the distance between inhibitory neuronal somata to the nearest astrocyte soma. We find that on average, there are almost 14 pyramidal neurons per domain in the CA1, increasing toward the pyramidal layer midline, compared to only five excitatory neurons per domain in the amygdala. Finally, we discovered that somatostatin neurons are found in close proximity to astrocytes, compared to parvalbumin and VIP inhibitory neurons. This work provides a comprehensive large-scale quantitative foundation for studying neuron-astrocyte interactions.

Original languageAmerican English
Pages (from-to)2378-2390
Number of pages13
JournalGLIA
Volume69
Issue number10
DOIs
StatePublished - Oct 2021

Bibliographical note

Publisher Copyright:
© 2021 Wiley Periodicals LLC.

Keywords

  • CLARITY
  • VIP
  • amygdala
  • hippocampus
  • parvalbumin
  • pyramidal neurons
  • somatostatin neurons

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