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Capturing T Lymphocytes' Dynamic Interactions With Human Neural Cells Using Time-Lapse Microscopy.

Florent Lemaître1,2, Ana Carmena Moratalla1,2, Negar Farzam-Kia1,2

  • 1Department of Neurosciences, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada.

Frontiers in Immunology
|May 10, 2021
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Summary

Activated CD8+ T lymphocytes exhibit distinct behaviors when interacting with CNS cells. Inflammation increases their motility and exploratory actions, revealing new insights into neuroimmune interactions.

Keywords:
MHC class Iastrocytesinflammationlive imagingneurons

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Area of Science:

  • Neuroimmunology
  • Cellular Biology
  • Immunology

Background:

  • T lymphocyte infiltration into the central nervous system (CNS) is implicated in neurodegenerative diseases.
  • Understanding T cell interactions with neural cells is crucial for deciphering CNS immune responses.

Purpose of the Study:

  • To investigate the spatiotemporal interactions between human CD8+ T lymphocytes and CNS cells (astrocytes, neurons) in vitro.
  • To characterize T lymphocyte behavior in response to neural cells and inflammatory conditions.

Main Methods:

  • Established an in vitro co-culture model of human CD8+ T lymphocytes, astrocytes, and neurons.
  • Utilized time-lapse microscopy and individual cell tracking to analyze T cell behavior.
  • Quantified T cell motility and identified distinct behavioral patterns (scanning, dancing, poking, round).

Main Results:

  • CD8+ T lymphocytes showed increased motility and exploratory behavior with astrocytes compared to neurons.
  • IL-1β pretreatment (mimicking inflammation) significantly enhanced T cell motility and scanning behavior.
  • Blocking MHC class I on astrocytes reduced synapse-like (poking) interactions of T cells.
  • Identified and quantified four distinct T lymphocyte behaviors: scanning, dancing, poking, and round.

Conclusions:

  • The developed co-culture model effectively characterizes T lymphocyte interactions with CNS cells.
  • Inflammatory signals modulate T cell behavior, promoting active exploration within the CNS.
  • Specific interactions, like MHC class I-mediated poking, are identified, offering targets for therapeutic strategies in neuroinflammation.