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Related Experiment Videos

Myeloid cell function in MRP-14 (S100A9) null mice.

Josie A R Hobbs1, Richard May, Kiki Tanousis

  • 1Leukocyte Adhesion Laboratory, Cancer Research UK, London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3PX, United Kingdom.

Molecular and Cellular Biology
|March 18, 2003
PubMed
Summary

Myeloid-related protein 14 (MRP-14) is crucial for MRP-8 protein stability but dispensable for myeloid cell functions like chemotaxis and inflammation. MRP-14 knockout mice show normal responses in peritonitis models.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Myeloid-related protein 14 (MRP-14) and MRP-8 are cytosolic calcium-binding proteins abundant in neutrophils and monocytes.
  • Their specific roles in myeloid cell function remain incompletely understood.

Purpose of the Study:

  • To investigate the in vivo function of MRP-14 by creating and analyzing MRP-14 gene-targeted knockout mice.
  • To determine the impact of MRP-14 deficiency on myeloid cell stability, calcium signaling, and inflammatory responses.

Main Methods:

  • Targeted gene disruption of the MRP-14 gene in mice.
  • Analysis of myeloid cell morphology, density, and protein expression (MRP-8).
  • Assessment of calcium (Ca2+) flux, chemotaxis, phagocytosis, superoxide burst, apoptosis, and in vivo peritonitis models.

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Main Results:

  • MRP-14 knockout mice (MRP-14-/-) exhibited normal phenotypes and fertility.
  • MRP-8 protein levels were reduced in MRP-14-/- myeloid cells, indicating dependence on MRP-14 for stability.
  • While maximal Ca2+ responses were unchanged, lower-concentration responses to MIP-2 were reduced in MRP-14-/- neutrophils, without affecting chemotaxis.
  • Myeloid cell functions including phagocytosis, superoxide production, apoptosis, and in vivo inflammatory responses were unaffected.

Conclusions:

  • MRP-14 is essential for MRP-8 protein stability but not for the overall viability or basic functions of myeloid cells.
  • MRP-14 and MRP-8 appear dispensable for many critical myeloid cell functions and inflammatory processes.
  • These findings suggest a non-essential role for MRP-14 in the studied myeloid cell activities and inflammatory responses.