Proteome of Monocyte Priming by Lipopolysaccharide, Including Changes in Interleukin-1beta and Leukocyte Elastase Inhibitor

Overview

Journal Proteome Sci

Publisher Biomed Central

Date 2008 May 22

PMID 18492268

Citations 11

Authors

Michael J Pabst

Karen M Pabst

David B Handsman

Sarka Beranova-Giorgianni

Francesco Giorgianni

Affiliations

Soon will be listed here.

Abstract

Background: Monocytes can be primed in vitro by lipopolysaccharide (LPS) for release of cytokines, for enhanced killing of cancer cells, and for enhanced release of microbicidal oxygen radicals like superoxide and peroxide. We investigated the proteins involved in regulating priming, using 2D gel proteomics.

Results: Monocytes from 4 normal donors were cultured for 16 h in chemically defined medium in Teflon bags +/- LPS and +/- 4-(2-aminoethyl)-benzenesulfonyl fluoride (AEBSF), a serine protease inhibitor. LPS-primed monocytes released inflammatory cytokines, and produced increased amounts of superoxide. AEBSF blocked priming for enhanced superoxide, but did not affect cytokine release, showing that AEBSF was not toxic. After staining large-format 2D gels with Sypro ruby, we compared the monocyte proteome under the four conditions for each donor. We found 30 protein spots that differed significantly in response to LPS or AEBSF, and these proteins were identified by ion trap mass spectrometry.

Conclusion: We identified 19 separate proteins that changed in response to LPS or AEBSF, including ATP synthase, coagulation factor XIII, ferritin, coronin, HN ribonuclear proteins, integrin alpha IIb, pyruvate kinase, ras suppressor protein, superoxide dismutase, transketolase, tropomyosin, vimentin, and others. Interestingly, in response to LPS, precursor proteins for interleukin-1beta appeared; and in response to AEBSF, there was an increase in elastase inhibitor. The increase in elastase inhibitor provides support for our hypothesis that priming requires an endogenous serine protease.

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