The healthy development of an organism depends on its tissues and organs growing to the right size, stopping when they need to, and maintaining stability in their form and function. Correct development depends on the availability of nutrients to the cells in their environment, a process that is tightly controlled by signaling mechanisms that occur within and between the cells that form these structures. Disruptions in this signaling can lead to unbalanced growth within a tissue or organ, and can give rise to conditions such as cancer.
The TOR and PI3K signaling pathways regulate tissue growth according to nutrient availability, and are frequently over-activated in human cancer. In the study published recently, Institute for Research in Biomedicine (Institute for Research in Biomedicine (IRB) Barcelona) PhD student Ana Ferreira and Group Leader and Catalan Institution for Research and Advanced Studies (ICREA) Research Professor Marco Milán report that the over-activation of these two pathways not only causes the excess growth of cells and tissues, but also restrict the growth of neighboring cell populations.
They present evidence that the proteoglycan Dally, a protein that is known to modulate the spreading, stability, and activity of the growth-promoting signaling molecule called Dpp (in flies) or TGF-β (in humans), is regulated by these two pathways and mediates the effects on neighboring populations. “They do so by competing for Dpp,” says Ana Ferreira, first author of the paper and funded by a PhD fellowship from Portugal's Fundação para a Ciência e a Tecnologia.
"PTEN, a gene that negatively regulates the PI3K pathway, is one of the most commonly lost tumor suppressors in human cancer. Understanding whether this pathway also affects TGF-β spreading in mammals may help us to gain insight into the early events of tumorigenesis and the selection of the tumor-initiating cells," she confirms.
"Tumor initiating cells might be selected by their ability to compete for limiting growth factors and their capacity to restrict the growth of neighboring cell populations," says Marco Milán, head of the Development and Growth Control Laboratory at IRB Barcelona. "Seventy percent of men with prostate cancer are estimated to have lost a copy of the PTEN gene at the time of diagnosis. It will be interesting to determine whether this mechanism, identified in fruit flies, is also active in humans."
Illustration: Depletion of the PTEN tumor suppressor gene induces tissue overgrowth and reduces the growth of the neighboring cell population in Drosophila wing primordia. –Marco Milán’s Lab.
Institute for Research in Biomedicine Barcelona News Release (08/28/15)
Science Daily (08/28/15)
Abstract (Public Library of Science Biology; 13(8) (08/27/15))