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Dynamic changes in Mcl-1 expression regulate macrophage viability or commitment to apoptosis during bacterial

Helen M Marriott1, Colin D Bingle, Robert C Read

  • 1Division of Genomic Medicine, University of Sheffield, Sheffield, United Kingdom.

The Journal of Clinical Investigation
|January 15, 2005
PubMed
Summary

Macrophages initially resist apoptosis by upregulating Mcl-1 protein, crucial for bacterial clearance. Later, Mcl-1 changes regulate programmed cell death, aiding infection resolution.

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Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • Macrophages are vital for clearing bacterial infections.
  • Macrophage apoptosis (programmed cell death) is essential for resolving infections.
  • Mcl-1 regulates macrophage lifespan and the transition to apoptosis.

Purpose of the Study:

  • Investigate the role of Mcl-1 in pneumococcal-induced macrophage apoptosis.
  • Understand how Mcl-1 expression changes impact macrophage viability and bacterial clearance.

Main Methods:

  • Studied pneumococcal-associated macrophage apoptosis.
  • Analyzed Mcl-1 protein expression and its isoforms.
  • Utilized Mcl-1 transgenic macrophages and mice.

Main Results:

  • Macrophages upregulate Mcl-1 upon pneumococcal exposure, maintaining viability.
  • Mcl-1 expression shifts to a novel splice variant, Mcl-1(Exon-1), preceding apoptosis.
  • Altered Mcl-1 expression delayed apoptosis, impaired bacterial killing, and reduced bacterial clearance in mice.

Conclusions:

  • Dynamic regulation of Mcl-1 is critical for macrophage viability during infection.
  • Mcl-1 expression changes orchestrate the switch from resistance to susceptibility to apoptosis.
  • Mcl-1 plays a key role in antibacterial host defense and infection resolution.