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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Cancer Research

Background:

  • The small GTPase Rac is crucial for cell shape, migration, and phagocytosis.
  • Constitutively active Rac (Rac^G12V) can induce cannibalism of nurse cells by border cells in Drosophila.
  • Engineered mammalian Rac-enhanced chimeric-antigen-receptor macrophages (RaceCAR-Ms) show potential for cancer cell killing.

Purpose of the Study:

  • Investigate the cellular and molecular mechanisms of border cell-mediated nurse cell killing in Drosophila.
  • Understand how hyperactivated Rac leads to the destruction of larger cells by smaller ones.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism.
  • Employed genetic manipulation to express constitutively active Rac (Rac^G12V) in border cells.
  • Performed clonal analysis and assessed cell death markers like caspase activation and germline shrinkage.
  • Investigated the roles of the Rac GTPase and the Draper engulfment receptor.

Main Results:

  • Wild type border cells exhibit sublethal 'nibbling' of nurse cells, while Rac^G12V induces lethal phagocytosis with larger bites.
  • Lethal bites trigger rapid germline shrinkage, nuclear damage, and caspase activation spreading through the nurse cell syncytium.
  • Somatic follicle cells participate in engulfing the dying germline.
  • Rac and Draper are essential for both nibbling and lethal phagocytosis.
  • Clonal analysis revealed dose-dependent effects of Rac^G12V on cell death.
  • Increased Draper expression or JNK activity in border cells induced germline death independently of Rac.

Conclusions:

  • Hyperactivated Rac in a few border cells can trigger the destruction of a much larger cell mass.
  • Border cells employ multiple mechanisms, including Rac-dependent and Rac-independent pathways involving Draper and JNK, to induce germline death.
  • This study elucidates the process by which localized cellular activation leads to the demise of a larger cellular structure.