title: Heterogeneity of human monocytes: an optimized four-color flow cytometry protocol for analysis of monocyte subsets.
abstract: Monocytes are central mediators in the development of atherosclerotic plaques. They circulate in blood and eventually migrate into tissue including the vessel wall where they give rise to macrophages and dendritic cells. The existence of monocyte subsets with distinct roles in homeostasis and inflammation suggests specialization of function. These subsets are identified based on expression of the CD14 and CD16 markers. Routinely applicable protocols remain elusive, however. Here, we present an optimized four-color flow cytometry protocol for analysis of human blood monocyte subsets using a specific PE-Cy5-conjugated monoclonal antibody (mAb) to HLA-DR, a PE-Cy7-conjugated mAb to CD14, a FITC-conjugated mAb to CD16, and PE-conjugated mAbs to additional markers relevant to monocyte function. Classical CD14(+)CD16(-) monocytes (here termed "Mo1" subset) expressed high CCR2, CD36, CD64, and CD62L, but low CX(3)CR1, whereas "nonclassical" CD14(lo)CD16(+) monocytes (Mo3) essentially showed the inverse expression pattern. CD14(+)CD16(+) monocytes (Mo2) expressed high HLA-DR, CD36, and CD64. In patients with stable coronary artery disease (n = 13), classical monocytes were decreased, whereas "nonclassical" monocytes were increased 90% compared with healthy subjects with angiographically normal coronary arteries (n = 14). Classical monocytes from CAD patients expressed higher CX(3)CR1 and CCR2 than controls. Thus, stable CAD is associated with expansion of the nonclassical monocyte subset and increased expression of inflammatory markers on monocytes. Flow cytometric analysis of monocyte subsets and marker expression may provide valuable information on vascular inflammation. This may translate into the identification of monocyte subsets as selective therapeutic targets, thus avoiding adverse events associated with indiscriminate monocyte inhibition.
authors.affiliation: Swiss Stem Cells Foundation and Fondazione Cardiocentro Ticino, Via Tesserete 48, Lugano, Switzerland. tiziano.tallone@cardiocentro.org
authors.forename: Tiziano
authors.initials: T
authors.lastname: Tallone
authors.forename: Giovanna
authors.initials: G
authors.lastname: Turconi
authors.forename: Gianni
authors.initials: G
authors.lastname: Soldati
authors.forename: Giovanni
authors.initials: G
authors.lastname: Pedrazzini
authors.forename: Tiziano
authors.initials: T
authors.lastname: Moccetti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Vassalli
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000097:blood / Q000000981:diagnostic imaging / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping / Q000379:methods*; D018836:Inflammation Mediators / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000276:immunology*
chemical_list: D015415:Biomarkers; D018836:Inflammation Mediators