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The effect of statin therapy withdrawal on monocyte subsets
Author(s) -
Jaipersad Anthony S.,
Shantsila Eduard,
Blann Andrew,
Lip Gregory Y. H.
Publication year - 2013
Publication title -
european journal of clinical investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.164
H-Index - 107
eISSN - 1365-2362
pISSN - 0014-2972
DOI - 10.1111/eci.12183
Subject(s) - monocyte , receptor , angiogenesis , inflammation , downregulation and upregulation , statin , medicine , tissue factor , immunology , receptor expression , cancer research , endocrinology , biology , biochemistry , coagulation , gene
Background Three functionally distinct monocyte subsets have been identified. Statins are of undoubted effect in atherosclerosis and have numerous pleiotropic effects that contribute to their clinical success, but the effect of these drugs on monocyte subsets is unclear. We hypothesised a beneficial effect of statins on key receptor expression by monocyte subsets. Material and methods Effects of temporal (2 weeks) cessation of statin therapy by 66 patients with stable coronary artery disease on monocyte subsets [ CD 14++ CD 16‐ CCR 2+ ( M on1), CD 14++ CD 16+ CCR 2+ ( M on2) and CD 14+ CD 16++ CCR 2− ( M on3)], their aggregates with platelets and their expression of a number of receptors involved in inflammation ( IL ‐6 receptor), adhesion [vascular cell adhesion molecule ( VCAM )], angiogenesis [vascular endothelial growth factor ( VEGF )] and repair were assessed by flow cytometry. Results Statin cessation did not lead to any significant changes in absolute numbers of monocyte subsets or the degree of their aggregation with platelets. All monocyte subsets showed significant downregulation of expression of vascular endothelial factor receptor 2, T ie2 and Toll‐like receptor‐4 ( TLR 4; all changes P < 0·01). Expression of CXCR 4 was only reduced in Mon1 cells ( P = 0·013). There was no significant change in the expression of CD 14, CD 16, CCR 4, IL 6 receptor and VCAM (all P = NS). Conclusions Statin withdrawal does not affect counts of any of monocyte subsets, but leads to downregulation of expression of TLR 4 and receptors related to angiogenesis on all subsets, as well as a decrease in density of CXCR 4 expression on ‘classical’ Mon1. These data provide further support of pleiotropic effects of statins and their effects on monocyte pro‐angiogenic and proreparative characteristics.