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Updated: Feb 28, 2026

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
Published on: June 15, 2019
C1q: A fresh look upon an old molecule
Nicole M Thielens1, Francesco Tedesco2, Suzanne S Bohlson3
1Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
C1q, initially known for complement activation, plays crucial roles in immunity, tissue repair, and brain function. This review explores its diverse functions beyond the classical complement pathway.
Area of Science:
- Immunology
- Molecular Biology
- Neuroscience
Background:
- C1q is a glycoprotein initiating the classical complement pathway.
- It comprises 18 polypeptide chains with distinct functional regions.
- C1q regulates cellular processes independently of complement activation.
Purpose of the Study:
- To summarize classical C1q functions.
- To review novel discoveries regarding C1q's roles.
- To highlight C1q's involvement in diverse physiological and pathological processes.
Main Methods:
- Literature review of classical and recent C1q research.
- Analysis of C1q's molecular structure and function.
- Synthesis of findings across immunology, tissue repair, and neuroscience.
Main Results:
- C1q enhances phagocytosis and regulates cytokine production and T-lymphocyte maturation.
- C1q is implicated in pregnancy, tissue repair, and cancer.
- C1q is vital for neuronal network refinement and CNS homeostasis.
Conclusions:
- C1q possesses multifaceted functions extending beyond complement initiation.
- Emerging roles in autoimmunity prevention, tissue homeostasis, and neurological function are significant.
- C1q represents a key target for understanding and potentially treating various diseases.
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