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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Polarized SOS activity orchestrates FGF-directed cell migration in vivo.

Theresa V Gibney1, Laila Y Latifi1, Jacob I Mardick2

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Directed cell migration relies on receptor tyrosine kinase (RTK) signaling. In C. elegans, fibroblast growth factor receptor (FGFR) and Ras signaling pathways guide cell movement independently of canonical effectors, revealing novel migration mechanisms.

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C. elegansERKFGFRTKRasSOSSon of Sevenlesscell migrationextracellular signal-regulated kinasefibroblast growth factorreceptor tyrosine kinasesex myoblast

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Directed cell migration is crucial for animal development and tissue homeostasis.
  • Receptor tyrosine kinase (RTK) signaling pathways are vital for interpreting extracellular cues and guiding cell movement.
  • Dysregulated RTK activity is linked to various cancers, but in vivo mechanisms remain incompletely understood.

Purpose of the Study:

  • To elucidate the in vivo mechanisms by which RTK signaling directs cell migration.
  • To dissect the spatial and temporal requirements of key signaling and cytoskeletal proteins in migrating cells.

Main Methods:

  • Systematic dissection of signaling and cytoskeletal proteins in migrating C. elegans muscle progenitors.
  • Utilized cell-type-specific depletion of endogenous proteins.
  • Employed genetic analysis, including intragenic revertants, to uncouple signaling pathways.

Main Results:

  • Fibroblast growth factor receptor (FGFR), GRB2, SOS, and Ras homologs control cell migration independently of canonical ERK, PI3K, and PLCγ effectors.
  • SOS polarity serves as an intracellular compass for directed migration, with mislocalization disrupting movement.
  • Activated Ras facilitates anterior migration, and specific Ras mutations uncouple migration signaling from Ras-ERK pathways.

Conclusions:

  • Identified a novel mechanism for RTK-directed cell migration, emphasizing pathway independence from canonical effectors.
  • Demonstrated the critical role of SOS polarity in interpreting directional cues.
  • Highlighted the utility of cell-type-specific approaches and genetic tools for studying signaling dynamics in vivo.