In multicellular organisms, cells are constantly moving from one place to another.
This cell migration is essential during development of the organism as well as
maintenance of tissues in the adult. For example, cells of the immune system
migrate out of the blood stream to fight infections and help repair wounds. In
humans, cell migration also contributes to the development of cancer. During
cancer progression, cancer cells invade and migrate through the tissues and enter
and then exit the blood stream to form secondary tumors, known as metastases.
We are investigating how cancer cells attach to the endothelial cells lining blood
vessels, with the long term goal of inhibiting cancer metastasis. I will describe how
we have identified specific proteins inside cells and on the surface of cells that are
needed for cancer cells to interact with endothelial cells, and how reducing the
expression of these proteins can decrease cancer metastasis.