Effect of the Secretome of Mesenchymal Placenta Stem Cells on the Functional Properties of Lewis Lung Carcinoma Cells In Vitro

This paper concerns the effect produced by the components of a conditioned medium (K‑medium), in which mesenchymal human placenta cells (hP-MSC) are cultivated, on the characteristics of Lewis lung carcinoma (LLC) cells in the culture. It is shown for the first time that the K-medium (secretome) components have a prooncogenic effect on LLC cells as evidence by an increase in cell survival rates, LLC cell proliferation stimulation, and a decrease in the level of apoptotic cells. The effect of the K-medium on the adhesion characteristics of LLC cells in the process of their monolayer growth and migration from 3D-cultures is also demonstrated. When the hP-MSC secretome interacts with the cultured LLC cells, the production of proinflammatory cytokines TGF β and Il-6 is observed to grow. At the same time, the proangiogenic factor VEGF remains almost at the same level. Similar changes in the microenvironment during the interaction of mesenchymal and tumor cells may underlie various prooncogenic effects observed in our previous studies with different MSC inoculation methods during the development and metastasis of Lewis lung carcinoma in vivo.