Gene expression profiling reveals the defining features of the classical, intermediate, and nonclassical human monocyte subsets

Blood - Tập 118 - Trang e16-e31 - 2011
Kok Loon Wong1, June Jing-Yi Tai1, Wing-Cheong Wong2, Hao Han2, Xiaohui Sem1, Wei-Hseun Yeap1, Philippe Kourilsky1, Siew-Cheng Wong1
1Singapore Immunology Network and
2Bioinformatics Institute, Agency for Science, Technology and Research, Singapore

Tóm tắt

AbstractNew official nomenclature subdivides human monocytes into 3 subsets: the classical (CD14++CD16−), intermediate (CD14++CD16+), and nonclassical (CD14+CD16++) monocytes. This introduces new challenges, as monocyte heterogeneity is mostly understood based on 2 subsets, the CD16− and CD16+ monocytes. Here, we comprehensively defined the 3 circulating human monocyte subsets using microarray, flow cytometry, and cytokine production analysis. We find that intermediate monocytes expressed a large majority (87%) of genes and surface proteins at levels between classical and nonclassical monocytes. This establishes their intermediary nature at the molecular level. We unveil the close relationship between the intermediate and nonclassic monocytes, along with features that separate them. Intermediate monocytes expressed highest levels of major histocompatibility complex class II, GFRα2 and CLEC10A, whereas nonclassic monocytes were distinguished by cytoskeleton rearrangement genes, inflammatory cytokine production, and CD294 and Siglec10 surface expression. In addition, we identify new features for classic monocytes, including AP-1 transcription factor genes, CLEC4D and IL-13Rα1 surface expression. We also find circumstantial evidence supporting the developmental relationship between the 3 subsets, including gradual changes in maturation genes and surface markers. By comprehensively defining the 3 monocyte subsets during healthy conditions, we facilitate target identification and detailed analyses of aberrations that may occur to monocyte subsets during diseases.

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