Background: In patients with coronary artery disease (CAD), a well grown collateral circulation has been shown to be important. The aim of this prospective study using peripheral blood monocytes was to identify marker genes for an extensively grown coronary collateral circulation.
Methods: Collateral flow index (CFI) was obtained invasively by angioplasty pressure sensor guidewire in 160 individuals (110 patients with CAD, and 50 individuals without CAD). RNA was extracted from monocytes followed by microarray-based gene-expression analysis. 76 selected genes were analysed by real-time polymerase chain reaction (PCR). ROC analysis based on differential gene expression was then performed to separate individuals with poor (CFI<0.21) and well developed collaterals (CFI³0.21) Thereafter, the influence of the chemokine MCP-1 on the expression of six selected genes was tested by PCR.
Results: The expression of 203 genes significantly correlated with CFI (p=0.000002-0.00267) in patients with CAD and 56 genes in individuals without CAD (p=00079-0.0430). Biological pathway analysis revealed 76 of those genes belonging to 4 different pathways: angiogenesis, integrin-, platelet derived growth factor-, and transforming growth factor b-signalling. Three genes in each subgroup differentiated with high specificity among individuals with low and high CFI (³0.21). Two out of these genes showed pronounced differential expression between the two groups after cell stimulation with MCP-1.
Conclusions: Genetic factors play a role in the formation and the pre-formation of the coronary collateral circulation. Gene expression analysis in peripheral blood monocytes can be used for non-invasive differentiation between individuals with poorly and with well grown collaterals. MCP-1 can influence the arteriogenic potential of monocytes.
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