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The Role of Complement in Angiogenesis.

Maciej M Markiewski1, Elizabeth Daugherity1, Britney Reese1

  • 1Department of Immunotherapeutics and Biotechnology, Jerry H. Hodge School of Pharmacy, Texas Tech University Health Sciences Center, Abilene, TX 79601, USA.

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The complement system plays a dual role in angiogenesis, promoting or inhibiting blood vessel growth depending on the context. New research highlights its regulation in conditions like age-related macular degeneration and cancer.

Keywords:
angiogenesiscancercomplementocular pathology

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Area of Science:

  • Immunology
  • Vascular Biology
  • Ophthalmology

Background:

  • The role of the complement system in angiogenesis has been largely speculative.
  • Age-related macular degeneration is a key area where complement involvement in neovascularization is suspected.
  • Previous evidence linking complement to blood vessel formation was indirect.

Purpose of the Study:

  • To review recent experimental evidence on the complement system's role in angiogenesis.
  • To discuss context-dependent anti- and proangiogenic functions of complement.
  • To explore therapeutic targeting of complement in angiogenesis-related diseases.

Main Methods:

  • Review of recent experimental studies and literature.
  • Analysis of complement's function in various angiogenesis models (wound healing, retinal regeneration, AMD, cancer).
  • Discussion of context-specific pro- and anti-angiogenic mechanisms.

Main Results:

  • Direct experimental evidence confirms complement system regulation of physiological and pathological angiogenesis.
  • Complement's function in angiogenesis is context-dependent, exhibiting both pro- and anti-angiogenic effects.
  • Age-related macular degeneration serves as a clinically relevant example of pathological neovascularization influenced by complement.

Conclusions:

  • The complement system is an important regulator of both homeostatic and pathological angiogenesis.
  • Newly discovered complement functions offer potential therapeutic targets for angiogenesis-related disorders.
  • Understanding the context-specific roles of complement is crucial for developing effective therapies.