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Complement, a key part of innate immunity, is now known to function within cells. It regulates metabolic pathways impacting cell survival, proliferation, and autophagy, with implications for disease.

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Area of Science:

  • Immunology
  • Cell Biology
  • Metabolic Regulation

Background:

  • Complement system is a critical component of innate immunity, essential for pathogen clearance.
  • Traditionally viewed as extracellular, complement activation also occurs intracellularly.
  • Emerging evidence highlights complement's role beyond pathogen defense.

Purpose of the Study:

  • To review the intracellular functions of the complement system.
  • To explore the integration of complement activation with cellular metabolic pathways.
  • To discuss the implications of these roles in infection and disease.

Main Methods:

  • Literature review of recent research on complement's intracellular functions.
  • Analysis of studies investigating complement's role in cellular metabolism.
  • Synthesis of findings on complement's interactions with other cellular networks.

Main Results:

  • Complement activation regulates key metabolic pathways influencing cell survival, proliferation, and autophagy.
  • Complement plays a role in metabolic reprogramming crucial for T cell effector differentiation.
  • Complement acts as a nexus, interacting with inflammasome and Notch signaling pathways.

Conclusions:

  • Intracellular complement functions significantly impact fundamental cellular processes.
  • The interplay between complement and cellular metabolism has broad implications for health and disease.
  • Further research into complement's intracellular roles is warranted for therapeutic development.