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Related Experiment Videos

Post-translational processing of the murine third component of complement.

J L Bednarczyk1, J D Capra

  • 1Department of Microbiology, University of Texas Health Science Center, Dallas 75235-9048.

Scandinavian Journal of Immunology
|January 1, 1988
PubMed
Summary
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The study reveals that carboxylic ionophores inhibit the processing of pro-C3 (complement component 3 precursor) in macrophages. This inhibition is not due to pH changes but suggests the involved enzymes function at neutral pH or a broad pH range.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The third component of complement (C3) is crucial for immune responses.
  • C3 is synthesized as a pro-C3 precursor and processed into alpha and beta chains.
  • Murine C3 alpha chains are glycosylated, unlike human C3.

Purpose of the Study:

  • To investigate the biosynthesis and secretion of C3 in the J774.2 macrophage cell line.
  • To determine the mechanism by which carboxylic ionophores affect C3 processing.

Main Methods:

  • Utilized the J774.2 macrophage cell line.
  • Employed pulse-chase experiments to track C3 processing.
  • Applied carboxylic ionophores (monensin, nigericin) and other cellular perturbants.

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Main Results:

  • Pro-C3 is processed intracellularly into disulfide-linked alpha (110-115 kDa) and beta (55-60 kDa) chains.
  • Monensin and nigericin inhibited pro-C3 processing at ~10(-6) M.
  • Inhibition was independent of intracellular pH changes, suggesting enzymes function at neutral or broad pH ranges.

Conclusions:

  • Carboxylic ionophores block C3 proteolytic processing in macrophages.
  • The processing enzymes are likely located in a neutral pH compartment or are broadly active proteases.
  • This provides insight into the intracellular trafficking and enzymatic regulation of C3 biosynthesis.