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Cytoplasmic tail of MT1-MMP regulates macrophage motility independently from its protease activity

Takeharu Sakamoto1, Motoharu Seiki

  • 1Division of Cancer Cell Research, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan.

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|April 18, 2009
PubMed

Insights

Membrane type-1 matrix metalloproteinase (MT1-MMP) regulates macrophage invasion and migration. MT1-MMP uses both protease activity and cytoplasmic tail-dependent non-proteolytic functions to control macrophage behavior.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Membrane type-1 matrix metalloproteinase (MT1-MMP) is a key regulator of cellular functions.
  • MT1-MMP deficiency in mice (MT1(-/-)) leads to various cellular and tissue defects.
  • Macrophages play critical roles in inflammatory responses and tissue remodeling.

Purpose of the Study:

  • To investigate the role of MT1-MMP in macrophage infiltration and migration during inflammation.
  • To elucidate the mechanisms by which MT1-MMP influences macrophage invasion and migration.

Main Methods:

  • Comparison of macrophage behavior between wild-type (WT) and MT1-MMP-deficient (MT1(-/-)) mice.
  • Assessment of macrophage invasion through reconstituted basement membrane (Matrigel).
  • Analysis of macrophage migration rates and the impact of MT1-MMP mutations and inhibitors.

Main Results:

  • MT1(-/-) mice showed reduced macrophage infiltration into inflammatory sites.
  • MT1(-/-) macrophages exhibited impaired invasion and migration compared to WT macrophages.
  • MT1-MMP's migration-boosting activity was dependent on its cytoplasmic tail but not its catalytic domains.

Conclusions:

  • MT1-MMP promotes macrophage invasion through its protease activity.
  • MT1-MMP enhances macrophage migration via a non-proteolytic mechanism involving its cytoplasmic tail.
  • MT1-MMP plays a dual role in regulating macrophage functions critical for inflammatory responses.

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