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RECK isoforms have opposing effects on cell migration.

Ha Neul Lee1, Mithun Mitra2,3, Oye Bosompra2

  • 1Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095.

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|June 7, 2018
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Summary
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Alternative splicing of the RECK gene produces two isoforms with opposing effects on cell migration. A short RECK isoform promotes migration, while the canonical isoform inhibits it, offering new insights into cell motility regulation.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cell migration is crucial for development and disease, involving cytoskeletal changes and extracellular matrix remodeling.
  • Mechanisms of cell motility are well-studied, but the role of alternative isoform expression remains largely unexplored.
  • Reversion-inducing-cysteine-rich protein with Kazal motifs (RECK) is a known inhibitor of cell migration.

Purpose of the Study:

  • To investigate the impact of alternative RECK isoform expression on cell migration.
  • To elucidate the molecular mechanisms by which RECK isoforms regulate cell motility.

Main Methods:

  • Analysis of RECK isoform expression in proliferating and differentiated cells, TGF-β-treated fibroblasts, and tumor tissues.
  • RNA interference (RNAi) to knockdown specific RECK isoforms.
  • Cell migration assays using Matrigel.
  • Co-immunoprecipitation to study protein-protein interactions.

Main Results:

  • A shorter RECK isoform is upregulated in proliferating fibroblasts, TGF-β-treated fibroblasts, and tumors.
  • Knockdown of the short RECK isoform decreases fibroblast migration.
  • The short RECK isoform competes with matrix metalloprotease 9 (MMP9) for binding to the canonical RECK isoform.
  • This competition liberates MMP9, suggesting a novel regulatory mechanism.

Conclusions:

  • Alternative splicing and polyadenylation generate RECK isoforms with opposing functions in cell migration.
  • The short RECK isoform promotes cell migration by interfering with canonical RECK-MMP9 interactions.
  • This study reveals a new paradigm for how alternative splicing regulates cell motility from a single gene locus.