RGD Reference Report - PECAM-1 dampens cytokine levels during LPS-induced endotoxemia by regulating leukocyte trafficking. - Rat Genome Database

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PECAM-1 dampens cytokine levels during LPS-induced endotoxemia by regulating leukocyte trafficking.

Authors: Privratsky, JR  Tilkens, SB  Newman, DK  Newman, PJ 
Citation: Privratsky JR, etal., Life Sci. 2012 Jan 30;90(5-6):177-84. Epub 2011 Nov 18.
RGD ID: 6771174
Pubmed: PMID:22119535   (View Abstract at PubMed)
PMCID: PMC3264774   (View Article at PubMed Central)
DOI: DOI:10.1016/j.lfs.2011.11.002   (Journal Full-text)

AIMS: To investigate the mechanism by which platelet endothelial cell adhesion molecule 1 (PECAM-1/CD31), an immunoglobulin (Ig)-superfamily cell adhesion and signaling receptor, regulates pro-inflammatory cytokine levels. The purpose of the present investigation was to test the hypothesis that PECAM-1 influences circulating cytokine levels by regulating the trafficking of activated, cytokine-producing leukocytes to sites of inflammation. MAIN METHODS: PECAM-1+/+ and PECAM-1-/- mice were subjected to lipopolysaccharide (LPS)-induced endotoxemia, and systemic cytokine levels were measured by Bioplex multiplex cytokine assays. Flow cytometry was employed to enumerate leukocytes at inflammatory sites and to measure cytokine synthesis in leukocyte sub-populations. Enzyme-linked immunosorbent assay (ELISA) was used to measure cytokine levels in tissue samples and in supernatants of in vitro-stimulated leukocytes. KEY FINDINGS: We confirmed earlier reports that mice deficient in PECAM-1 had greater systemic levels of pro-inflammatory cytokines following intraperitoneal (IP) LPS administration. Interestingly, expression of PECAM-1, in mice, had negligible effects on the level of cytokine synthesis by leukocytes stimulated in vitro with LPS and in peritoneal macrophages isolated from LPS-injected mice. There was, however, excessive accumulation of macrophages and neutrophils in the lungs of PECAM-1-deficient, compared with wild-type, mice--an event that correlated with a prolonged increase in lung pro-inflammatory cytokine levels. SIGNIFICANCE: Our results demonstrate that PECAM-1 normally functions to dampen systemic cytokine levels during LPS-induced endotoxemia by diminishing the accumulation of cytokine-producing leukocytes at sites of inflammation, rather than by modulating cytokine synthesis by leukocytes.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Endotoxemia  ISOPecam1 (Mus musculus)6771174; 6771174 RGD 
Endotoxemia  IMP 6771174 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Pecam1  (platelet and endothelial cell adhesion molecule 1)

Genes (Mus musculus)
Pecam1  (platelet/endothelial cell adhesion molecule 1)

Genes (Homo sapiens)
PECAM1  (platelet and endothelial cell adhesion molecule 1)


Additional Information