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PGC-derived migrasomes couple PGC proliferation with migration.

Boqi Liu1,2,3, Zheng Jiang1,2,4, Wenhao Song1,2,3,5

  • 1State Key Laboratory of Membrane Biology, School of Life Sciences, Tsinghua University, Beijing, China.

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|April 9, 2026
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Summary
This summary is machine-generated.

Zebrafish primordial germ cells (PGCs) use migrasomes to deliver growth factors, linking cell migration and proliferation for germline expansion. This novel mechanism ensures sustained signaling during embryonic development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Coordinated cell migration and proliferation are crucial for embryogenesis and tissue maintenance.
  • The classical gradient signaling model cannot fully explain sustained mitogenic signaling in migrating cells.

Purpose of the Study:

  • To investigate the mechanism by which migrating primordial germ cells (PGCs) in zebrafish maintain proliferation.
  • To explore the role of migrasomes in coupling cell migration and proliferation during germline development.

Main Methods:

  • Utilized zebrafish as a model organism.
  • Investigated the biogenesis and function of migrasomes in PGCs.
  • Analyzed the role of tspan7 in migrasome formation and GDF3 delivery.
  • Examined GDF3-mediated activation of the TGF-β receptor (acvr1ba) pathway.

Main Results:

  • PGCs generate migrasomes, which are vesicular organelles formed at retraction fibers.
  • Migrasomes deliver the growth factor GDF3 to neighboring PGCs via contact-dependent interactions.
  • GDF3 activates the acvr1ba receptor, promoting spatiotemporally restricted proliferation.
  • This homocrine signaling mechanism allows migrating PGCs to autonomously sustain proliferation.

Conclusions:

  • Migrasomes act as a novel signaling platform, bridging cell migration and proliferation in zebrafish PGCs.
  • This migrasome-mediated homocrine signaling circumvents signal dilution in the embryonic environment.
  • The findings reveal a new mechanism for collective cell behavior with implications for development and disease.