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VIP Inhibits Porphyromonas gingivalis LPS-induced Immune Responses in Human Monocytes
N. Foster*,
J. Cheetham,
J.J. Taylor and
P.M. Preshaw
Oral Microbiology and Host Responses Group, School of Dental Sciences, University of Newcastle Upon Tyne, NE2 4BW, UK;
Correspondence: * corresponding author, neil.foster{at}ncl.ac.uk
Lipopolysaccharide (LPS) from the Gram-negative pathogen Porphyromonas gingivalis (Pg) stimulates cytokine secretion in immune cells, and thereby initiates the inflammation associated with periodontitis. Modulation of pro-inflammatory cytokine activity is a plausible therapeutic target in periodontal disease. Vasoactive intestinal peptide (VIP) has a role in immunoregulation, and has been identified as a molecule with therapeutically beneficial immunosuppressive effects in inflammatory and autoimmune conditions. We aimed to investigate the effect of VIP on immune responses induced by Pg LPS in vitro. VIP (10–8 M) significantly (P < 0.05) inhibits TNF- production by human monocytic THP1 cells stimulated with Pg LPS. In parallel, we showed that VIP inhibits nuclear translocation of NF B and c-Jun in a time-dependent manner, but does not decrease the expression of CD14 receptors. This is the first report to show the potential of VIP as an immunomodulator of Pg-stimulated inflammatory pathways in human monocytes.
Key Words: monocyte VIP Porphyromonas gingivalis LPS
Journal of Dental Research, Vol. 84, No. 11,
999-1004 (2005)
DOI: 10.1177/154405910508401106

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