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Procalcitonin and calcitonin gene-related peptide decrease LPS-induced tnf production by human circulating blood

G Monneret1, A Pachot, B Laroche

  • 1Immunology Laboratory, Centre Hospitalier Lyon-Sud, Pierre-Bénite, France.

Cytokine
|June 14, 2000
PubMed
Summary
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Procalcitonin (PCT) and calcitonin gene-related peptide (CGRP) were found to inhibit tumor necrosis factor-alpha (TNF-alpha) production in human septic shock models. This study reveals a novel anti-inflammatory role for these peptides in sepsis pathogenesis.

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Septic shock pathogenesis is linked to uncontrolled tumor necrosis factor-alpha (TNF-alpha) production.
  • Procalcitonin (PCT) and calcitonin gene-related peptide (CGRP) are derived from the calcitonin gene.
  • Elevated PCT levels are observed in human sepsis, and CGRP shows anti-inflammatory effects in rats.

Purpose of the Study:

  • To investigate the role of PCT and CGRP in regulating the inflammatory response during septic shock.
  • To determine if PCT and CGRP inhibit TNF-alpha production in a human whole blood model.

Main Methods:

  • Utilized a human whole blood model to assess lipopolysaccharide (LPS)-induced TNF-alpha production.
  • Administered PCT and CGRP at specific concentrations (10(-7) M and 10(-6) M, respectively).

Related Experiment Videos

  • Used CGRP 8-37 (10 microM) as a CGRP receptor antagonist to evaluate CGRP's mechanism of action.

    • Main Results:

    • PCT significantly inhibited TNF-alpha production by 27% (p<0.05).
    • CGRP significantly inhibited TNF-alpha production by 24% (p<0.05).
    • The inhibitory effect of CGRP was reversed by the CGRP receptor antagonist, confirming receptor-mediated action. No significant effects were observed on interleukin-1, -6, or -8 levels.

    Conclusions:

    • This study provides the first evidence of an anti-inflammatory role for PCT and CGRP in humans.
    • PCT and CGRP can modulate the inflammatory response in septic shock by inhibiting TNF-alpha production.
    • These findings suggest potential therapeutic implications for PCT and CGRP in managing septic shock.