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Zebrafish Mib Promotes Long-Distance Transport of Jagged2 Via Extracellular Vesicles.

Ji Yeon Hong1, Sang-Yeon Won2, Jung Jin Lee1

  • 1Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Korea.

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Summary

Mib regulates Jagged2 stability and Notch signaling during neural development. Extracellular vesicles containing Jagged2 and Mib may mediate long-range Notch signaling in the developing nervous system.

Keywords:
Extracellular vesicles (EVs)Jagged2MibUbiquitinZebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Signaling

Background:

  • Kolmer-Agduhr (KA) neurons differentiate from ventral spinal cord progenitors.
  • Jagged2-mediated Notch signaling controls KA neuron differentiation during late neurogenesis.
  • Mib also regulates KA neuron numbers via Notch signaling, but its interaction with Jagged2 is unclear.

Purpose of the Study:

  • To investigate the role of Mib in regulating Jagged2 and Notch signaling during late neurogenesis.
  • To elucidate the relationship between Jagged2 and Mib in neural development.

Main Methods:

  • Ubiquitination assays in P19 cells (undifferentiated and retinoic acid-differentiated).
  • Co-immunoprecipitation (Co-IP) to assess protein interactions.
  • Cell transplantation experiments to study extracellular vesicle formation.

Main Results:

  • Mib-mediated ubiquitination of Jagged2 promotes its proteasomal degradation in undifferentiated cells.
  • Mib physically interacts with Jagged2, but not its intracellular domain.
  • Mib co-expression enhances the formation of Jagged2-containing extracellular vesicles (EVs).

Conclusions:

  • Mib regulates Jagged2 protein levels and stability.
  • EVs containing Jagged2 and Mib may function in long-range Notch signaling.
  • This mechanism is potentially crucial for vertebrate nervous system development.