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    Circulating CD14+ and CD14highCD16− classical monocytes are reduced in patients with signs of plaque neovascularization in the carotid artery

    Access Status
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    Authors
    Ammirati, E.
    Moroni, F.
    Magnoni, M.
    Di Terlizzi, S.
    Villa, C.
    Sizzano, F.
    Palini, A.
    Garlaschelli, K.
    Tripiciano, F.
    Scotti, I.
    Catapano, A.
    Manfredi, A.
    Norata, Giuseppe
    Camici, P.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Ammirati, E. and Moroni, F. and Magnoni, M. and Di Terlizzi, S. and Villa, C. and Sizzano, F. and Palini, A. et al. 2016. Circulating CD14+ and CD14highCD16− classical monocytes are reduced in patients with signs of plaque neovascularization in the carotid artery. Atherosclerosis. 255: pp. 171-178.
    Source Title
    Atherosclerosis
    DOI
    10.1016/j.atherosclerosis.2016.10.004
    ISSN
    0021-9150
    School
    School of Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/43415
    Collection
    • Curtin Research Publications
    Abstract

    Background and aims: Monocytes are known to play a key role in the initiation and progression of atherosclerosis and contribute to plaque destabilization through the generation of signals that promote inflammation and neoangiogenesis. In humans, studies investigating the features of circulating monocytes in advanced atherosclerotic lesions are lacking. Methods: Patients (mean age 69 years, 56% males) with intermediate asymptomatic carotid stenosis (40–70% in diameter) were evaluated for maximal stenosis in common carotid artery, carotid bulb and internal carotid artery, overall disease burden as estimated with total plaque area (TPA), greyscale and neovascularization in 244 advanced carotid plaques. Absolute counts of circulating CD14+ monocytes, of classical (CD14highCD16-), intermediate (CD14highCD16+) and non-classical (CD14lowCD16+) monocytes and HLA-DR+ median fluorescence intensity for each subset were evaluated with flow cytometry. Results: No correlation was found between monocytes and overall atherosclerotic burden, nor with high sensitivity C-reactive protein (hsCRP) or interleukin-6 (IL-6). In contrast, plaque signs of neovascularization were associated with significantly lower counts of circulating CD14+ monocytes (297 versus 350 cells/mm3, p = 0.039) and of classical monocytes (255 versus 310 cells/mm3, p = 0.029). Conclusions: Neovascularized atherosclerotic lesions selectively associate with lower blood levels of CD14+ and CD14highCD16- monocytes independently of systemic inflammatory activity, as indicated by normal hsCRP levels. Whether the reduction of circulating CD14+ and CD14highCD16- monocytes is due to a potential redistribution of these cell types into active lesions remains to be explored.

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