Drug delivery to macrophages: A review of targeting drugs and drug carriers to macrophages for inflammatory diseases

Adv Drug Deliv Rev. 2020:165-166:15-40. doi: 10.1016/j.addr.2019.12.001. Epub 2019 Dec 6.

Abstract

Macrophages play a key role in defending against foreign pathogens, healing wounds, and regulating tissue homeostasis. Driving this versatility is their phenotypic plasticity, which enables macrophages to respond to subtle cues in tightly coordinated ways. However, when this coordination is disrupted, macrophages can aid the progression of numerous diseases, including cancer, cardiovascular disease, and autoimmune disease. The central link between these disorders is aberrant macrophage polarization, which misguides their functional programs, secretory products, and regulation of the surrounding tissue microenvironment. As a result of their important and deterministic roles in both health and disease, macrophages have gained considerable attention as targets for drug delivery. Here, we discuss the role of macrophages in the initiation and progression of various inflammatory diseases, summarize the leading drugs used to regulate macrophages, and review drug delivery systems designed to target macrophages. We emphasize strategies that are approved for clinical use or are poised for clinical investigation. Finally, we provide a prospectus of the future of macrophage-targeted drug delivery systems.

Keywords: Autoimmune disease; Cardiovascular disease; Drug delivery; Inflammation; Macrophages; Solid tumors.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Systematic Review

MeSH terms

  • Autoimmune Diseases / drug therapy
  • Autoimmune Diseases / physiopathology
  • Cytokines / biosynthesis
  • Drug Carriers
  • Drug Delivery Systems / methods*
  • Humans
  • Inflammation / drug therapy*
  • Inflammation / physiopathology*
  • Inflammation Mediators / immunology*
  • Macrophages / immunology*
  • Monocytes / metabolism
  • Neoplasms / drug therapy
  • Neoplasms / physiopathology
  • Tumor Microenvironment
  • Tumor-Associated Macrophages / immunology

Substances

  • Cytokines
  • Drug Carriers
  • Inflammation Mediators