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Related Concept Videos

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Complement and Chlamydia psittaci: Early Complement-Dependent Events Are Important for DC Migration and Protection

Martin Kohn1, Christian Lanfermann1, Robert Laudeley1

  • 1Medical School Hannover, Institute of Medical Microbiology and Hospital Epidemiology, Hannover, Germany.

Frontiers in Immunology
|March 26, 2021
PubMed
Summary
This summary is machine-generated.

Complement factor C3 is vital for fighting Chlamydia psittaci pneumonia in mice. This study shows C3 is needed early and late in infection, aiding dendritic cell migration for effective immune responses.

Keywords:
C3aChlamydiaadaptive immunitycobra venom factorcomplementdendritic cellsintracellular

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Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • * *Chlamydia psittaci* is a zoonotic bacterium causing severe pneumonia in humans.
  • * Complement factor C3 and its anaphylatoxin C3a enhance protection against *C. psittaci* lung infection in mice via an unclear mechanism.

Purpose of the Study:

  • * To elucidate the role of complement in early innate and late specific immune responses to *C. psittaci*.
  • * To determine the required C3 concentration, timing of its action, mediating receptors, and its effect on dendritic cell migration.

Main Methods:

  • * Infection of various complement C3 knockout (KO) mice with *C. psittaci*.
  • * Pharmacological transient decomplementation and analysis of *in vivo* dendritic cell migration.
  • * Assessment of C3 levels, timing of requirement, and receptor involvement (C3aR, C5aR).

Main Results:

  • * Near wildtype C3 levels are necessary for complete protection against *C. psittaci*.
  • * Heterozygous C3+/- mice showed delayed but improved recovery compared to C3-/- mice.
  • * Complement, particularly C3, is crucial during the initial days of infection and also supports later stages.
  • * Migration of CD103+ dendritic cells to lymph nodes depends on C3 and its receptors (C3aR and/or C5aR).

Conclusions:

  • * C3 is essential for effective early and late immune responses against *C. psittaci* lung infection.
  • * C3-mediated dendritic cell migration is critical for antigen presentation and adaptive immunity.
  • * This study provides mechanistic insights into complement's role in intracellular bacterial infections.