Epithelial membrane protein 2 modulates infectivity of Chlamydia muridarum (MoPn)

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Cell-Free Scaled Production and Adjuvant Addition to a Recombinant Major Outer Membrane Protein from Chlamydia muridarum for Vaccine Development
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Cell-Free Scaled Production and Adjuvant Addition to a Recombinant Major Outer Membrane Protein from Chlamydia muridarum for Vaccine Development

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Kaori Shimazaki1, Madhuri Wadehra, Ashley Forbes

  • 1Molecular Biology Institute, Los Angeles, CA 90095, USA.

Microbes and Infection
|June 5, 2007
PubMed

Insights

Epithelial membrane protein-2 (EMP2) facilitates Chlamydia muridarum infection of host cells. Reducing EMP2 levels impairs bacterial entry, while increasing EMP2 enhances it, identifying EMP2 as a key host factor in chlamydial pathogenesis.

Area of Science:

  • Microbiology
  • Cell Biology
  • Infectious Diseases

Background:

  • Chlamydiae are significant bacterial pathogens causing acute and chronic diseases.
  • Host cell entry mechanisms for Chlamydia remain incompletely understood.
  • Epithelial membrane protein-2 (EMP2) is upregulated in epithelial cells during chlamydial infections.

Purpose of the Study:

  • To investigate the role of Epithelial membrane protein-2 (EMP2) in the infectivity of Chlamydia muridarum (MoPn).
  • To determine if EMP2 expression levels influence MoPn entry and survival in host epithelial cells.

Main Methods:

  • Assessing MoPn infectivity in cell lines with manipulated EMP2 expression (knockdown and overexpression).
  • Utilizing an epithelial cell line lacking native EMP2 and reintroducing EMP2 recombinantly.
  • Blocking surface EMP2 with a specific antibody to evaluate its impact on infection.
  • Analyzing MoPn infectivity in EMP2-overexpressing cells for heparin dependency.

Main Results:

  • MoPn infectivity correlated directly with host cell EMP2 expression levels.
  • EMP2 knockdown significantly impaired MoPn infectivity.
  • EMP2 overexpression markedly increased MoPn infectivity.
  • Blocking surface EMP2 with an antibody reduced chlamydial infection efficiency.
  • MoPn infection in EMP2-overexpressing cells was not heparin-dependent, suggesting EMP2's role in early, potentially irreversible infection stages.

Conclusions:

  • Epithelial membrane protein-2 (EMP2) is a critical host factor supporting Chlamydia muridarum (MoPn) infection.
  • EMP2 expression levels directly modulate the efficiency of MoPn entry into epithelial cells.
  • EMP2 represents a potential therapeutic target for mitigating chlamydial infections.

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