Title
Neurocysticercal antigens stimulate chemokine secretion from human monocytes via an NF-κB-dependent pathway
Date Issued
01 June 2006
Access level
metadata only access
Resource Type
journal article
Publisher(s)
Elsevier
Abstract
Neurocysticercosis, infection with larval Taenia solium, is a common, serious neuroparasitic infection. Larval degeneration results in inflammatory cell influx and granuloma formation which leads to clinical symptomatology. The role of chemokines in such cell influx is unknown. We demonstrate that monocyte stimulation by T. solium larval antigen (TsAg) results in a differential profile of CXCL8/IL-8 (146.5 ± 8.5 ng/ml after 24 h), CCL2/MCP-1 (267 ± 4 ng/ml after 48 h) and CCL3/MIP-1α (1.72 ± 0.43 ng/ml after 8 h) secretion. There was coordinate mRNA accumulation reaching maximum at 1 h for CCL3 and 2 h for CXCL8 and CCL2. TsAg induced maximal nuclear binding of p65, p50 and c-rel subunits of the transcriptional regulator NF-κB by 2 h. IκBα but not IκBβ was degraded within 10 min before resynthesis by 2 h. Pre-treatment with the broad-spectrum NF-κB inhibitor pyrrolidine dithiocarbamate caused complete abrogation of TsAg-induced CCL2 secretion (p = 0.005) and 91% reduction of CXCL8 secretion (p = 0.0003). TsAg was unable to induce CXCL8 promoter activity in Toll-like receptor (TLR)-2 or TLR-4/MD-2 transfected HeLa cells in the absence of lectins or other adaptor molecules. In summary, our data demonstrate that TsAg induces chemokine secretion via specific pathways dependent on NF-κB but not TLR-4/TLR-2, and indicate a potential mechanism whereby larval degeneration results in brain inflammation. © 2006 Elsevier SAS. All rights reserved.
Start page
1732
End page
1740
Volume
8
Issue
7
Language
English
OCDE Knowledge area
Enfermedades infecciosas Neurociencias
Scopus EID
2-s2.0-33746607306
PubMed ID
Source
Microbes and Infection
ISSN of the container
1769714X
Sponsor(s)
We thank Dr. José A. Chabalgoity for critical reading and helpful comments. This work was supported by grant numbers AI-42037-01 and AI-35894 from the National Institutes of Health, USA, the ITREID training grant TW00910 and by The Wellcome Trust.
Sources of information: Directorio de Producción Científica Scopus