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Related Experiment Video

Updated: May 2, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
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Autocrine effects of tumor-derived complement.

Min Soon Cho1, Hernan G Vasquez1, Rajesha Rupaimoole2

  • 1Department of Benign Hematology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA.

Cell Reports
|March 12, 2014
PubMed
Summary
This summary is machine-generated.

Cancer cells use the complement system to fuel their growth. This study reveals how complement proteins like C3a and C5a promote tumor progression, impacting patient survival and offering new therapeutic targets.

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Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • The complement system, a part of innate immunity, plays a complex role in cancer.
  • Emerging evidence suggests complement activation within the tumor microenvironment can influence cancer progression.

Purpose of the Study:

  • To investigate the role of tumor-derived complement proteins in promoting cancer growth.
  • To elucidate the signaling pathways involved in complement-mediated tumor growth.
  • To assess the prognostic significance of complement components in cancer patients.

Main Methods:

  • Analysis of complement protein secretion by cancer cells.
  • Investigating the autocrine signaling of complement activation products (C3a, C5a) via their receptors (C3aR, C5aR).
  • Utilizing gene silencing (PI3K/AKT) in cancer cells to assess pathway involvement.
  • Correlating tumoral mRNA levels of C3 and C5aR with patient survival data in ovarian and lung cancer cohorts.

Main Results:

  • Cancer cells secrete complement proteins that, upon activation, stimulate tumor growth.
  • Complement-mediated tumor growth occurs via an autocrine mechanism, partly independent of cytotoxic T cells.
  • Activated C5aR and C3aR signal through the PI3K/AKT pathway in cancer cells.
  • Silencing PI3K or AKT abrogated the progrowth effects of C5aR and C3aR.
  • Elevated tumoral C3 or C5aR mRNA levels in ovarian and lung cancer patients correlated with poorer overall survival.

Conclusions:

  • Tumor-derived complement proteins actively promote cancer growth through autocrine signaling.
  • The PI3K/AKT pathway is a critical mediator of complement-driven tumor cell proliferation.
  • Complement component levels serve as potential biomarkers for predicting patient outcomes in certain cancers.
  • Targeting tumor-derived complement represents a promising therapeutic strategy in oncology.