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Reorganization of the host cytoskeleton by the intracellular pathogen Chlamydia trachomatis

Yadunanda Kumar1, Raphael H Valdivia

  • 1Center for Microbial Pathogenesis and Department of Molecular Genetics and Microbiology; Duke University Medical Center; Durham, North Carolina USA.

Communicative & Integrative Biology
|August 26, 2009
PubMed

Insights

Chlamydia bacteria remodel host cell structures, using F-actin and intermediate filaments to stabilize their niche. A bacterial protease modifies these structures, potentially aiding pathogen survival and immune evasion.

Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogenesis

Background:

  • Chlamydiae are obligate intracellular bacteria causing significant human diseases.
  • These pathogens reside within a host-derived vacuole called an inclusion, which expands during replication.
  • The host cytoskeleton plays a crucial role in maintaining the integrity of the inclusion.

Purpose of the Study:

  • To investigate how Chlamydia manipulates host cytoskeletal components for its intracellular niche.
  • To explore the role of a secreted chlamydial protease in modifying the inclusion scaffold.
  • To discuss the implications of altered host cytoskeletal dynamics in chlamydial infection pathogenesis.

Main Methods:

  • Analysis of host cell-pathogen interactions using advanced microscopy techniques.
  • Investigating the recruitment and remodeling of F-actin and intermediate filaments around the inclusion.
  • Characterizing the activity and function of a chlamydial protease in modifying the inclusion scaffold.

Main Results:

  • Chlamydia recruits and remodels host F-actin and intermediate filaments to create a stable scaffold for the inclusion.
  • A secreted chlamydial protease progressively modifies the intermediate filament scaffold as the inclusion expands.
  • This modification likely enhances inclusion flexibility, accommodating increased bacterial load and potentially aiding immune evasion.

Conclusions:

  • Chlamydia actively remodels the host cytoskeleton to support its intracellular lifestyle.
  • Bacterial protease activity on the inclusion scaffold is a unique mechanism for pathogen survival.
  • Alterations in host cytoskeletal dynamics by Chlamydia are critical factors in chlamydial pathogenesis and immune evasion.
Keywords:
ChlamydiaRho GTPasescell motilityinflammationintermediate filaments

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