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Related Experiment Videos

Control of integrin expression by extracellular matrix

M Delcommenne1, C H Streuli

  • 1School of Biological Sciences, University of Manchester, United Kingdom.

The Journal of Biological Chemistry
|November 10, 1995
PubMed
Summary
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Extracellular matrix influences cell behavior by altering integrin expression. This study reveals that the extracellular matrix controls beta 1 integrin subunit expression at both transcriptional and post-transcriptional levels.

Area of Science:

  • Cell Biology
  • Extracellular Matrix Research
  • Integrin Signaling

Background:

  • Integrin-mediated cell-extracellular matrix interactions are crucial for tissue development and function.
  • These interactions trigger intracellular signals that regulate gene expression.
  • Understanding integrin regulation is key to comprehending cellular processes.

Purpose of the Study:

  • To investigate how extracellular matrix composition affects integrin subunit expression in mouse mammary epithelial cells and other cell lines.
  • To determine the regulatory mechanisms (transcriptional vs. post-transcriptional) controlling integrin expression in response to the extracellular matrix.
  • To compare integrin expression patterns in cells cultured on different substrates (tissue culture plastic vs. basement membrane) and in vivo.

Main Methods:

Related Experiment Videos

  • Culturing mouse mammary epithelial cells (including CID-9 and MMTE strains) and K1735-M2 melanoma cells on tissue culture plastic and basement membrane matrices.
  • Measuring steady-state mRNA levels of various integrin subunits (alpha 1, 2, 3, 5, 6, 7, alpha v, beta 1).
  • Analyzing gene transcription rates, mRNA stability, protein levels, and protein turnover rates.

Main Results:

  • Cells cultured on plastic showed significantly higher mRNA levels for multiple integrin subunits compared to cells on basement membrane or in vivo.
  • This upregulation pattern was consistent across different mouse cell lines.
  • Regulation occurred at transcriptional levels in melanoma cells and at both transcriptional and post-transcriptional levels in mammary epithelial cells, with similar protein turnover rates observed on both substrates.

Conclusions:

  • The extracellular matrix composition critically controls the expression of beta 1 integrin subunits.
  • Integrin expression is regulated by the extracellular matrix through both transcriptional and post-transcriptional mechanisms.
  • These findings highlight the dynamic interplay between cells and their matrix environment in modulating integrin function.