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Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay
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Published on: March 1, 2011

Meprin A and meprin alpha generate biologically functional IL-1beta from pro-IL-1beta

Christian Herzog1, Randy S Haun, Varsha Kaushal

  • 1Central Arkansas Veterans Healthcare System, 4300 W. 7th Street, 111D, Little Rock, AR 72205, USA.

Biochemical and Biophysical Research Communications
|January 13, 2009
PubMed

Insights

Meprin A and meprin alpha generate active interleukin-1beta (IL-1beta) by cleaving its precursor. This process is crucial for inflammation and tissue injury, as shown in a sepsis model.

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Interleukin-1beta (IL-1beta) is a key inflammatory cytokine.
  • Its precursor, pro-IL-1beta, requires specific cleavage for biological activity.
  • Meprin metalloendopeptidases are implicated in various biological processes.

Purpose of the Study:

  • To investigate the role of meprin A and meprin alpha in pro-IL-1beta processing.
  • To compare the biological activity of IL-1beta generated by meprins versus other proteases.
  • To assess the in vivo relevance of meprin-mediated IL-1beta production in a sepsis model.

Main Methods:

  • Purification of meprin A and expression of recombinant meprin alpha.
  • Amino-acid sequencing to identify cleavage sites on pro-IL-1beta.
  • Assay of IL-1beta biological activity using helper T-cell proliferation.
  • Induction of sepsis in mice via cecal ligation puncture and administration of meprin inhibitor actinonin.

Main Results:

  • Meprin A and meprin alpha cleave pro-IL-1beta at the His(115)-Asp(116) bond, generating active IL-1beta.
  • IL-1beta produced by meprin A exhibited 3-fold higher biological activity than that from meprin beta or caspase-1.
  • In a mouse sepsis model, the meprin inhibitor actinonin significantly reduced serum IL-1beta levels.

Conclusions:

  • Meprin A and meprin alpha are potent producers of biologically active IL-1beta.
  • These enzymes cleave pro-IL-1beta at a site distinct from, but near, the caspase-1 site.
  • Meprin A and meprin alpha play a significant role in IL-1beta production during inflammation and tissue injury.

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