Abstract
We previously found that dietary tyrosine (Tyr) and phenylalanine (Phe) limitation significantly decreased the metastatic phenotype of B16BL6 melanoma cells in vivo and decreased the in vitro invasion of these cells. To more specifically characterize the effects of Tyr and Phe deprivation we examined the three steps involved in invasion: attachment to host cells and components, elaboration of proteases that degrade basement membranes, and migration of invading tumor cells. Here we report that B16BL6 melanoma cell invasion through growth factor reduced (GFR) MatrigelTM is significantly decreased by Tyr and Phe deprivation. Tyr and Phe deprivation in vitro decreased the attachment of B16BL6 melanoma cells to GFR MatrigelTM, heparin sulfate proteoglycans (HSPG), neonatal murine epidermal (NME) cells and the extracellular matrix (ECM) from these cells. These cells also exhibited a decrease in chemotactic response to fetal bovine serum (FBS). Deprivation of these two amino acids decreased the secretion of urokinase plasminogen activator (uPA) and tissue plasminogen activator (tPA) while plasminogen activator inhibitor (PAI)-1 and -2 were increased in these cells. These observations suggest that Tyr and Phe deprivation decreases the in vitro chemotactic and invasive ability of B16BL6 melanoma cells by decreasing attachment and secreted PA activity and by increasing secreted PAIs in these cells.
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Pelayo, B.A., Fu, YM. & Meadows, G.G. Inhibition of B16BL6 melanoma invasion by tyrosine and phenylalanine deprivation is associated with decreased secretion of plasminogen activators and increased plasminogen activator inhibitors. Clin Exp Metastasis 17, 841–848 (1999). https://doi.org/10.1023/A:1006713000684
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DOI: https://doi.org/10.1023/A:1006713000684