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Related Experiment Videos

Interaction between Chlamydia spp. and human polymorphonuclear leukocytes in vitro.

K B Register, P A Morgan, P B Wyrick

    Infection and Immunity
    |June 1, 1986
    PubMed
    Summary
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    Chlamydia psittaci and Chlamydia trachomatis elementary bodies (EB) trigger human polymorphonuclear leukocytes (PMN) chemotaxis. These chlamydiae efficiently enter and survive within PMN, potentially leading to subsequent tissue infection.

    Area of Science:

    • Immunology
    • Microbiology
    • Cell Biology

    Background:

    • Chlamydia psittaci and Chlamydia trachomatis are obligate intracellular bacteria.
    • Polymorphonuclear leukocytes (PMN) are key immune cells involved in pathogen clearance.

    Purpose of the Study:

    • To investigate the interaction between Chlamydia elementary bodies (EB) and human PMN.
    • To determine if Chlamydia EB can induce PMN chemotaxis and be internalized by these cells.

    Main Methods:

    • In vitro chemotaxis assays using human PMN and C. psittaci/C. trachomatis EB.
    • Measurement of 3H-labeled EB association and inclusion-forming units (IFUs) to quantify internalization.
    • Assessment of chlamydial infectivity and viability within PMN over time.

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    Main Results:

    • Chlamydia EB, but not reticulate bodies or supernatants, induced PMN chemotaxis.
    • Both C. psittaci and C. trachomatis EB were efficiently internalized by PMN via a nonopsonin-dependent mechanism.
    • A significant portion of internalized chlamydiae lost infectivity within 1 hour, but a small percentage remained infectious for up to 10 hours, capable of infecting secondary cells.

    Conclusions:

    • Chlamydia EB can modulate PMN function and evade initial intracellular killing.
    • PMN can serve as a transient reservoir for Chlamydia, facilitating dissemination to other host cells.
    • The ability of Chlamydia to persist in PMN may contribute to establishing productive infections in target tissues.