Effets de la protéine C-réactive sur la biologie du monocyte humain dans l'athériosclérose à travers une analyse du transcriptome

Abstract : Object : Inflammation plays an important role in the pathophysiology of atherosclerosis. Non specific inflammation biomarkers, such as C-Reactive Protein (CRP), are associated with a higher risk of developing atherosclerosis or other acute complications. By its capacity to differentiate into macrophages and to interact with other cells monocytes play a key role in atherogenesis. In order to better understand the causal link between CRP and atherosclerosis, we studied the effects of CRP on several aspects of human monocyte biology. Material and methods : Monocytes isolated from peripheral blood of healthy men (n=9) and healthy premenopausal women (n=9), were purified by Ficoll and CD14 positive selection, cultured over night then exposed to purified CRP (25 µg/ml) for 12 or 24h. A custom-made oligonucleotide array of 250 genes was used to analyse gene expression profiles of monocytes exposed or not to CRP. Changes in gene expression were confirmed by quantitative PCR and western blot. Results and Discussion : Our results show CRP increased pro-inflammatory cytokine (IL-1 and IL-6) and chemokine (IL-8 and Gro-beta) expression. In contrast, CRP decreased MIP-1 alpha, MIP-1 beta and alpha-2 macro-globuline expression. Furthermore, we were able to report, for the first time, that CRP increased gene expression of Liver X receptor (LXR) alpha, a transcription factor whose role in atherosclerosis has only recently been shown. Using western blot, we showed that the increased LXR alpha gene expression was followed by its nuclear translocation. In conclusion, this thesis suggests that CRP may have both pro and anti-inflammatory effects on the human monocyte ex-vivo. Our results argue in favor of an anti-atherogenic role of CRP, at least in part by its new effect on LXR alpha.
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Didier Hanriot. Effets de la protéine C-réactive sur la biologie du monocyte humain dans l'athériosclérose à travers une analyse du transcriptome. Médecine humaine et pathologie. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10119⟩. ⟨tel-01777273⟩

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