Phenotype Changes of Circulating Monocytes in a Hypercholesterolemic Swine Model of Coronary Artery DiseaseSilverio Sbrana1*, Gualtiero Pelosi2, Maria Rita Puntoni3, Federica Viglione2, Maria Giovanna Trivella2 and Oberdan Parodi2
- *Corresponding Author:
- Silverio Sbrana
Flow Cytometry Laboratory, CNR Institute of Clinical Physiology
“G. Pasquinucci” Heart Hospital, 54100 Massa (MS), Italy
E-mail: [email protected]
Received Date: June 16, 2014; Accepted Date: August 21, 2014; Published Date: August 23, 2014
Citation: Sbrana S, Pelosi G, Puntoni MR, Viglione F, Trivella MG, et al. (2014) Phenotype Changes of Circulating Monocytes in a Hypercholesterolemic Swine Model of Coronary Artery Disease. J Cytol Histol 5:270. doi:10.4172/2157-7099.1000270
Copyright: © 2014 Sbrana S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Objective: Inflammation and immunity activation play a key role in atherosclerosis (ATS) onset and progression. Aim of this study was to investigate the relationships between phenotype of circulating monocytes and coronary artery disease (CAD) development in a histologically well-characterized swine model of ATS.
Methods: Blood samples were obtained from 6 animals at baseline and after 16 weeks high fat cholesterolenriched diet. Flow cytometry monocyte identification was performed (CD172a marker). Adhesion (CD18a, CD11a, CD11R3, CD49d, CD29), differentiation (CD14) and activation receptors (SLA-DR, CD16, CD163) were quantified as percentage of positivity (%) and Relative Fluorescence Intensity (RFI). Lipid parameters (LDL, oxLDL, HDL) and soluble endothelial ICAM-1 were measured and histologic quantitative assessment of coronary ATS was performed.
Results: Flow cytometry analysis demonstrated a significant post-diet decrease of CD14 RFI and an increment of % SLA-DR. Pre-diet values of ICAM-1 and % SLA-DR correlated reciprocally (P=0.0191) and with several CAD severity indexes (P≤0.02). Positive correlations between RFI changes of CD29 (P=0.0213) and CD18a (P=0.0341) and morphometric indexes of coronary ATS were found. Post-diet RFI values of CD29, CD18a and CD16 were also closely related to morphometric parameters (P<0.03). A cumulative post-diet tendency to increase of CD14low/ CD163high monocyte fraction (45.07 ± 2.27 vs. 40.14 ± 3.16) and a tight correlation between changes of this monocyte subset and corresponding HDL variations (P=0.0100) were also observed.
Conclusions: Blood monocyte orientation towards a macrophage-like phenotype, similar to a HDL-induced maturation, and a close association between markers changes and severity of diet induced coronary ATS could provide new insights into plaque growth and progression in CAD.