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Proteolytic Processing of Neuregulin 2.

Maria Czarnek1, Joanna Bereta2

  • 1Department of Cell Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Kraków, Gronostajowa 7, 30-387, Kraków, Poland. maria.czarnek@doctoral.uj.edu.pl.

Molecular Neurobiology
|December 16, 2019
PubMed
Summary

Proteases ADAM10 and BACE2 release Neuregulin 2 (NRG2) ectodomain, crucial for neurogenesis and psychiatric disorder research. This processing is essential for NRG2 function and further cleavage.

Keywords:
ADAM10BACEBACE2Neuregulin 2NeuregulinsShedding

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Area of Science:

  • Molecular and Cellular Neuroscience
  • Protease Biology
  • Neurotrophic Factor Signaling

Background:

  • Neuregulin 2 (NRG2) is an EGF family growth factor implicated in neurogenesis and psychiatric disorders.
  • Proteolytic processing is essential for ectodomain shedding and receptor activation of neuregulins, with NRG1 extensively studied.
  • The specific proteases involved in NRG2 processing remain largely uncharacterized.

Purpose of the Study:

  • To identify the key proteases responsible for the proteolytic processing of murine Neuregulin 2 (NRG2).
  • To investigate the role of specific proteases in releasing the NRG2 ectodomain and generating its C-terminal fragment.
  • To confirm the co-expression of NRG2 and identified proteases in relevant neuronal populations.

Main Methods:

  • Utilized genetic engineering techniques to identify proteases involved in NRG2 processing.
  • Employed non-neuronal cell lines and primary hippocampal neuron cultures for experimental analysis.
  • Performed immunohistochemical staining to confirm co-localization of NRG2 and proteases in brain tissues.

Main Results:

  • Demonstrated that ADAM10 and BACE2 are the primary proteases responsible for releasing the NRG2 ectodomain.
  • Confirmed that NRG2 cleavage by ADAM10 or BACE2 yields a C-terminal fragment, a substrate for γ-secretase.
  • Showcased co-expression of NRG2 and BACE2 in specific brain regions, including the medulla oblongata and cerebellar deep nuclei.

Conclusions:

  • ADAM10 and BACE2 are key enzymes mediating the ectodomain shedding of Neuregulin 2.
  • The proteolytic processing of NRG2 by these proteases is critical for generating functional fragments and receptor activation.
  • NRG2 undergoes significant post-translational modifications, including glycosylation and phosphorylation, influencing its function.