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In vitro neutralization of Chlamydia trachomatis by monovalent Fab antibody specific to the major outer membrane

H Su1, H D Caldwell

  • 1Laboratory of Intracellular Parasites, National Institute of Allergy and Infectious Diseases, Hamilton, Montana 59840.

Infection and Immunity
|August 1, 1991
PubMed

Insights

Monovalent Fab antibodies targeting specific sites on Chlamydia trachomatis major outer membrane protein (MOMP) blocked bacterial attachment and infection. This supports MOMP

Area of Science:

  • Microbiology
  • Immunology
  • Cell Biology

Background:

  • Chlamydia trachomatis is a significant human pathogen.
  • The major outer membrane protein (MOMP) is a key surface antigen.
  • Understanding MOMP's role in infection is crucial for developing interventions.

Purpose of the Study:

  • To investigate the role of specific epitopes on Chlamydia trachomatis MOMP.
  • To determine the mechanism by which anti-MOMP antibodies neutralize infectivity.
  • To assess MOMP's function as a chlamydial adhesin.

Main Methods:

  • Production of monovalent Fab antibodies targeting specific MOMP epitopes.
  • In vitro infectivity assays using hamster kidney cells.
  • Microscopy and biochemical assays to analyze chlamydial attachment and aggregation.

Main Results:

  • Monovalent Fab antibodies against serovar- and subspecies-specific MOMP epitopes neutralized C. trachomatis infectivity.
  • Antibody-mediated neutralization occurred by preventing chlamydial attachment to host cells.
  • Evidence suggests MOMP functions as a chlamydial adhesin.

Conclusions:

  • Specific epitopes of C. trachomatis MOMP are critical for infectivity.
  • Anti-MOMP antibodies can block infection by inhibiting bacterial attachment.
  • These findings reinforce the role of MOMP as a crucial chlamydial adhesin.

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