In the February 1st issue of Genes & Development, Dr. Johanna Joyce and colleagues at Memorial Sloan Kettering Cancer Center lend new insight into the mechanism by which tumor-associated macrophages promote malignant progression.
Innate immune cells, including macrophages, comprise a large fraction of the cellular environment that infiltrates tumors -- the so-called "tumor microenvironment." Tumors have a dynamic relationship with their microenvironment, communicating via secreted factors to modulate cellular growth and cancer progression.
In their upcoming G&D paper, Dr. Joyce and colleagues delineate how tumor-associated macrophages (TAMs) promote tumor growth and invasion. The researchers found that macrophage cells infiltrating pancreatic, mammary and lung tumors produce high levels of the proteases cathepsin B and S (Cts B and S), which enhances tumor growth and invasion. Interestingly, the researchers discovered that increased Cts B and S activity is stimulated by the tumors, themselves -- through the release of interleukin (IL)-4.
The study is highly anticipated because it provides novel and compelling evidence for the therapeutic targeting of the tumor microenvironment -- specifically TAMs -- to disrupt communication and ultimately impede cancer progression.
Dr. Joyce is optimistic that "the identification of factors that are differentially produced by conscripted cells in the tumor microenvironment provides a strategy to selectively target these cells in combination with targeting the cancer cells, an approach that could have significant therapeutic potential."
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