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Microglial CD74 Expression Is Regulated by TGFβ Signaling.

Jannik Jahn1, Antonia Bollensdorf1, Christopher Kalischer1

  • 1Institute of Anatomy, University Medicine Rostock, University of Rostock, 18051 Rostock, Germany.

International Journal of Molecular Sciences
|September 23, 2022
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Summary

Transforming growth factor beta 1 (TGFβ1) regulates CD74 expression in microglia, a key cell in the central nervous system. This finding highlights TGFβ1

Keywords:
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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglia are crucial immune cells in the central nervous system (CNS), involved in both normal function and disease states.
  • Previous studies indicated CD74 (also known as invariant chain) expression in aged and disease-associated microglia.

Purpose of the Study:

  • To investigate the role of transforming growth factor beta 1 (TGFβ1) in regulating CD74 expression in microglia.
  • To elucidate the functional significance of microglial TGFβ1 signaling in the context of microglial activation.

Main Methods:

  • Utilized BV2 cell lines and primary microglia cultures for in vitro experiments.
  • Employed Cx3cr1-reporter mice for in vivo studies.
  • Applied quantitative real-time PCR (qPCR), flow cytometry, and immunohistochemistry for molecular and cellular analyses.

Main Results:

  • TGFβ1 significantly inhibited the lipopolysaccharide (LPS)-induced upregulation of CD74 in microglia, both in vitro and in vivo.
  • TGFβ1 alone mediated the downregulation of CD74 expression in microglia cultures.
  • Inhibition of TGFβ signaling in vivo led to a notable increase in CD74 expression, confirming TGFβ1's regulatory role.

Conclusions:

  • CD74 serves as a reliable marker for activated microglia.
  • Microglial TGFβ signaling is a critical regulator of CD74 expression during microglial activation processes.