In vitro assays for the extracellular matrix protein-regulated extravasation process

Area of Science:

• Oncology
• Cell Biology
• Biochemistry

Background:

• Extravasation, the movement of circulating tumor cells through blood vessel walls, is a crucial step in metastasis.
• Extracellular matrix (ECM) proteins secreted by cancer cells are implicated in the dynamic interactions between cancer and endothelial cells during extravasation.

Purpose of the Study:

• To describe two in vitro assays for demonstrating the involvement of ECM proteins in cancer cell extravasation.
• To investigate the role of ECM proteins in cancer cell migration and endothelial barrier function.

Main Methods:

• Development of two in vitro assays: transendothelial cell migration (TEM) assay and vascular permeability assay.
• Utilizing primary human umbilical vein endothelial cells (HUVEC) to form a HUVEC monolayer on a porous filter membrane in a Transwell chamber.
• TEM assay: Co-culturing cancer cells with the HUVEC monolayer to assess cancer cell migration efficiency.
• Vascular permeability assay: Applying conditioned medium from cancer cells to the HUVEC monolayer to study the impact of secreted ECM proteins on vessel wall permeability.

Main Results:

• The described assays provide a framework for studying the role of ECM proteins in cancer cell extravasation.
• These methods allow for the quantitative assessment of cancer cell migration through endothelial monolayers.
• The vascular permeability assay enables the evaluation of how cancer cell-secreted ECM proteins affect endothelial barrier integrity.

Conclusions:

• The developed in vitro assays are valuable tools for dissecting the molecular mechanisms of cancer cell extravasation.
• Understanding the contribution of ECM proteins to extravasation can inform the development of novel anti-metastatic therapies.
• These assays facilitate research into the complex interactions governing cancer cell dissemination and metastasis.