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Using Drosophila melanogaster to Dissect the Roles of the mTOR Signaling Pathway in Cell Growth

Anna Frappaolo1, Maria Grazia Giansanti1

  • 1Istituto di Biologia e Patologia Molecolari del CNR, c/o Dipartimento di Biologia e Biotecnologie, Sapienza Università di Roma, 00185 Roma, Italy.

Cells
|November 24, 2023
PubMed

Insights

The target of rapamycin (TOR) pathway regulates cell growth and metabolism. Studies in Drosophila revealed key components of mTORC1 and mTORC2 signaling, crucial for understanding growth and disease.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The target of rapamycin (TOR) kinase is a central regulator of cell growth, metabolism, and survival in eukaryotes.
  • TOR functions within two distinct complexes, mTORC1 and mTORC2, which control different cellular processes.
  • Dysregulation of TOR signaling is implicated in diseases like cancer and diabetes.

Purpose of the Study:

  • To elucidate the roles of mTORC1 and mTORC2 signaling components in cellular growth.
  • To understand the coordination between TOR signaling and insulin signaling.
  • To review the function of Drosophila Golgi phosphoprotein 3 in organ growth regulation.

Main Methods:

  • Genetic studies in *Drosophila melanogaster*.
  • Biochemical analyses of signaling pathways.
  • Investigating the role of Golgi phosphoprotein 3 in mTORC1 activation.

Main Results:

  • Identification of key mTORC1 and mTORC2 signaling components using *Drosophila*.
  • Dissection of their functions in cellular growth, coordinated with insulin signaling.
  • Demonstration of Drosophila Golgi phosphoprotein 3's role in organ growth via Rheb-mediated mTORC1 activation.

Conclusions:

  • *Drosophila* is a powerful model for dissecting TOR signaling pathways.
  • mTORC1 and mTORC2 play critical roles in cellular and organ growth.
  • The Golgi apparatus is emerging as a significant signaling hub for mTORC1.
Keywords:
DrosophilaGOLPH3GolgimTOR signaling

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