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Area of Science:

  • Immunology
  • Oncology
  • Systems Biology

Background:

  • Inflammation is linked to tumor development, but the complement system's role is unclear.
  • The membrane attack complex (MAC), a complement component, affects cell behavior but its role in cancer is understudied.

Purpose of the Study:

  • To investigate the role of the membrane attack complex (MAC) in tumor development.
  • To elucidate the mechanisms by which MAC influences tumor cells and their microenvironment.

Main Methods:

  • Global gene expression profiling was employed.
  • Systems biology and network analysis were used to analyze MAC-responsive gene expression changes.

Main Results:

  • A cluster of co-regulated genes impacting the extracellular space and tumor stroma was identified.
  • Network analysis revealed EGF receptor activation as a key mediator of MAC-induced responses.
  • A gene expression signature implicating MAC in tumor progression was uncovered.

Conclusions:

  • Sublytic MAC exposure induces tumor cell responses and promotes tumor progression.
  • Findings highlight the complement system's MAC as a potential driver of cancer.
  • Results may inform future cancer therapeutic strategies targeting complement.