Relative chemokine and adhesion molecule expression in Mediterranean spotted fever and African tick bite fever - 07/08/11
, Giovanni Davì g, Mogens Jensenius e, Francesca Santilli g, Kari Otterdal a, Thor Ueland a, c, Trude H. Flo f, Egil Lien i, Terje Espevik f, Stig S. Frøland a, b, d, Giustina Vitale h, Didier Raoult j, Pål Aukrust a, b, d
Corresponding author. Department of Infectious Diseases, St. Olavs Hospital, Olav Kyrres gt. 17, 7006 Trondheim, Norway. Tel.: +47 91112046; fax: +47 23073630.Summary |
Objectives |
Mediterranean spotted fever (MSF) caused by Rickettsia conorii (R. conorii) is a potential lethal disease while African tick bite fever (ATBF) caused by Rickettsia africae is a self-limiting flu-like illness. We hypothesized that different inflammatory potential in endothelial cells could contribute to the different clinical features in these rickettsioses.
Methods |
We analyzed the effect of heat-inactivated R. africae and R. conorii on the mRNA and protein levels of monocyte chemoattractant protein (MCP)-1, interleukin (IL)-8 and adhesion molecules in endothelial cells. Serum samples from patients with MSF (n=16) and ATBF (n=15) were collected before and after therapy.
Results |
R. conorii induced a marked increase in MCP-1, IL-8, and adhesion molecules in endothelial cells, involving toll-like receptor 4 activation. In contrast, R. africae induced MCP-1 expression, but only modest or no responses were seen on IL-8 and adhesion molecules. Comparable to the in vitro response, levels of IL-8 and adhesion molecules showed no or only a modest increase in ATBF patients while these inflammatory markers were markedly elevated during MSF.
Conclusions |
Our findings suggest a superior inflammatory potential of R. conorii as compared to R. africae in endothelial cells, potentially related to the more severe inflammation in MSF comparing ATBF.
Le texte complet de cet article est disponible en PDF.Keywords : Rickettsia, Chemokines, Adhesion molecules, Toll-like receptors, Endothelial cells
Plan
Vol 58 - N° 1
P. 68-75 - janvier 2009 Retour au numéro
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