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Nonclassical Monocytes in Health and Disease

Authors
  • Narasimhan, Prakash Babu
  • Marcovecchio, Paola
  • Hamers, Anouk A.J.
  • Hedrick, Catherine C.
Type
Published Article
Journal
Annual Review of Immunology
Publisher
Annual Reviews
Publication Date
Apr 26, 2019
Volume
37
Pages
439–456
Identifiers
DOI: 10.1146/annurev-immunol-042617-053119
Source
Annual Reviews
Keywords
License
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Abstract

Monocytes are innate blood cells that maintain vascular homeostasis and are early responders to pathogens in acute infections. There are three well-characterized classes of monocytes: classical (CD14+CD16− in humans and Ly6Chi in mice), intermediate (CD14+CD16+ in humans and Ly6C+Treml4+ in mice), and nonclassical (CD14−CD16+ in humans and Ly6Clo in mice). Classical monocytes are critical for the initial inflammatory response. Classical monocytes can differentiate into macrophages in tissue and can contribute to chronic disease. Nonclassical monocytes have been widely viewed as anti-inflammatory, as they maintain vascular homeostasis. They are a first line of defense in recognition and clearance of pathogens. However, their roles in chronic disease are less clear. They have been shown to be protective as well as positively associated with disease burden. This review focuses on the state of the monocyte biology field and the functions of monocytes, particularly nonclassical monocytes, in health and disease.

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