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Integrins regulate epithelial cell differentiation by modulating Notch activity

M Jesús Gómez-Lamarca1, Laura Cobreros-Reguera1, Beatriz Ibáñez-Jiménez1

  • 1Centro Andaluz de Biología del Desarrollo CSIC-University Pablo de Olavide, Sevilla 41013, Spain.

Journal of Cell Science
|September 3, 2014
PubMed

Insights

Integrin signaling controls cell cycle exit and differentiation during development. This pathway regulates the switch from mitosis to endocycle and impacts Notch signaling in Drosophila follicle cells.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Epithelial Biology

Background:

  • Coordinating cell cycle exit with differentiation is vital for development and tissue homeostasis.
  • Dysregulation of this process can lead to organogenesis defects and cancer.
  • Known regulators include Notch, Salvador-Warts-Hippo (SWH) pathways, and myosin activity.

Purpose of the Study:

  • To identify novel developmental signals regulating the switch from cell cycle exit to differentiation.
  • To investigate the role of integrin signaling in this developmental switch.
  • To elucidate the mechanisms by which integrins influence cell cycle and differentiation.

Main Methods:

  • Utilized Drosophila ovary follicle cell development as a model system.
  • Generated and analyzed integrin loss-of-function mutants.
  • Assessed cell cycle status, differentiation markers, and signaling pathway activity (Notch, SWH).

Main Results:

  • Integrin signaling disruption blocked the mitosis-to-endocycle switch and differentiation in posterior follicle cells (PFCs).
  • Integrin function regulates the cyclin-dependent kinase inhibitor (CKI) dacapo.
  • Integrin mutants exhibited impaired Notch signaling and endocytosis, which were rescued by modulating Notch pathway components.

Conclusions:

  • Integrin signaling is a novel, critical regulator of epithelial cell differentiation during development.
  • Integrins directly modulate the Notch pathway's activity to control cell cycle exit and differentiation timing.
  • Findings reveal integrin's role in the spatial and temporal regulation of developmental processes.
Keywords:
DifferentiationIntegrinsProliferation

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