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Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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Immunomodulation of C3H/HeJ cells by endotoxin associated protein and lipopolysaccharide endotoxin

B M Sultzer1, J Bandekar, R Castagna

  • 1State University of New York, Health Science Center, Brooklyn 11203.

Advances in Experimental Medicine and Biology
|January 1, 1992
PubMed

Insights

Protein kinase C (PKC) is crucial for activating B lymphocytes by endotoxin-associated protein (EP). Lipopolysaccharide (LPS) suppresses this activation by downregulating PKC, inhibiting cell cycle progression and RNA synthesis.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Endotoxin-associated protein (EP) activates C3H/HeJ B lymphocytes.
  • Protein kinase C (PKC) is implicated in this activation pathway.
  • The role of G proteins in early EP signaling is uncertain.

Purpose of the Study:

  • To investigate the role of PKC in EP-stimulated B lymphocyte activation.
  • To determine the effect of lipopolysaccharide (LPS) on EP-induced B cell responses.
  • To elucidate the mechanisms by which LPS inhibits B cell proliferation and function.

Main Methods:

  • Stimulation of C3H/HeJ B lymphocytes with EP.
  • Assessment of PKC activity and its role in signaling.
  • Analysis of cell cycle progression and DNA synthesis.
  • Evaluation of RNA synthesis and arachidonic acid metabolism.

Main Results:

  • PKC is vital for EP-induced C3H/HeJ B lymphocyte activation.
  • G proteins are unlikely to be involved in early EP signaling.
  • LPS suppresses EP-induced B cell DNA synthesis, potentially via PKC downregulation.
  • LPS inhibits B cell progression through G1 phase and RNA synthesis within 12 hours.
  • LPS also inhibits arachidonic acid metabolism in macrophages and T cell proliferation.

Conclusions:

  • PKC activation is a key early event in EP-mediated B lymphocyte activation.
  • LPS exerts inhibitory effects on B cell activation and proliferation by interfering with PKC signaling and cell cycle progression.
  • The findings highlight a complex interplay between EP, LPS, and B cell signaling pathways.

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