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Integrins and epithelial cell polarity.

Jessica L Lee1, Charles H Streuli2

  • 1Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK.

Journal of Cell Science
|July 5, 2014
PubMed
Summary

Cell polarity is the process by which cells develop distinct regions with different functions. In epithelial cells, this leads to apical and basal membrane domains. Integrins, which are cell surface receptors, may play a role in this process. The study reviews evidence that integrins may regulate basement membrane assembly and microtubule orientation. The authors propose a model in which both inside-out and outside-in signals are needed for polarity. Integrins may also influence vesicular trafficking and cancer progression. This work highlights the need for further research into integrin signaling in epithelial cells.

Keywords:
+TIPSBasement membraneBreastEndocytosisEpitheliumILKIntegrinLamininMammaryMicrotubulePolaritycell polarityintegrin signalingepithelial cell organizationcancer progression

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Area of Science:

  • Cell biology
  • Epithelial cell development
  • Cancer biology

Background:

Cell polarity involves distinct structural and functional regions within a cell. Epithelial cells exhibit apical and basal membrane domains. It was already known that cell-matrix interactions influence cell polarity. Integrins have been proposed to contribute to epithelial cell polarity. This gap motivated further investigation into integrin signaling mechanisms. No prior work had resolved the full role of integrins in polarity establishment. The relevance of integrins to cancer progression remains unclear. This paper aims to clarify integrin roles in epithelial cell polarity.

Purpose Of The Study:

The aim is to review evidence for integrin roles in epithelial cell polarity. The study focuses on inside-out and outside-in signaling mechanisms. The researchers propose a model of integrin-dependent polarity. They examine how integrins influence basement membrane and microtubule orientation. The purpose includes linking integrin polarity to cancer. The authors suggest integrins may regulate vesicular trafficking. This work addresses unresolved questions in polarity formation. The study seeks to clarify integrin contributions to epithelial organization.

Main Methods:

The authors synthesized findings from prior studies on integrin signaling. They examined how integrins interact with the extracellular matrix. Inside-out signaling was analyzed for basement membrane assembly. Outside-in signaling was studied for microtubule organization. The researchers reviewed evidence on vesicular trafficking regulation. They proposed a model integrating both signaling pathways. The study also evaluated integrin roles in cancer progression. The approach combined literature review with mechanistic modeling.

Main Results:

Integrins may regulate basement membrane assembly at the basal surface. Outside-in signals may control microtubule orientation and trafficking. Both signaling types appear necessary for polarity establishment. Integrins may influence apical-basal axis orientation. Vesicular trafficking is suggested to be regulated by integrin signaling. The basal integrin axis may be relevant to cancer progression. Integrin signaling may coordinate polarity and basement membrane formation. This model proposes integrins as central to epithelial organization.

Conclusions:

The authors suggest integrins may regulate epithelial cell polarity. Inside-out signaling may assemble basement membranes at the basal surface. Outside-in signals may control microtubule orientation and trafficking. Integrins may coordinate both signaling pathways for polarity. The study proposes integrins as key to epithelial organization. The basal integrin axis may influence cancer progression. The findings suggest integrins may be central to polarity formation. This work highlights the need for further integrin signaling research.

The authors propose integrins may regulate basement membrane assembly and microtubule orientation.

Outside-in signals may control apical-basal microtubule orientation and vesicular trafficking.

The basal surface is where basement membrane assembly and integrin signaling may occur.

The basal integrin axis may be relevant to cancer progression, according to the authors.

The model suggests both inside-out and outside-in signals are required for polarity establishment.

Integrins may coordinate basement membrane assembly and microtubule orientation for polarity.