Cancer-associated fibroblasts produce matrix-bound vesicles that influence endothelial cell function

Area of Science:

• Oncology
• Cell Biology
• Immunology

Background:

• Intercellular communication is crucial for tumor progression and metastasis.
• Cancer-associated fibroblasts (CAFs) significantly influence tumor microenvironment through their secretome.
• Understanding CAF-secreted factors and their targets is vital for developing anti-cancer therapies.

Purpose of the Study:

• To investigate the role of extracellular vesicles (EVs) released by CAFs in intercellular communication.
• To identify proteins transferred from CAFs to endothelial cells (ECs) and their functional impact.
• To elucidate the mechanism of protein transfer via matrix-bound EVs.

Main Methods:

• Proteomic analysis of proteins transferred from human mammary CAFs to ECs.
• Characterization of extracellular vesicles (EVs) produced by CAFs.
• Functional assays to assess the impact of transferred proteins on cell adhesion.

Main Results:

• CAFs release EVs containing plasma membrane receptors that are transferred to ECs.
• Proteins transferred from CAFs, exemplified by THY1, enhance monocyte adhesion to ECs.
• Matrix-bound EVs are identified as the primary mediators of protein transfer from CAFs.

Conclusions:

• CAF-derived EVs mediate intercellular communication by transferring functional proteins to ECs.
• This transfer influences immune cell interactions, potentially impacting tumor immunity.
• CAF-derived matrix-bound EVs represent a novel therapeutic target for modulating tumor pathology.