Release of Inorganic Phosphate into the Tumor Environment: Possible Roles of Ecto- Nucleotidases and Ecto-Phosphatases_Crimson Publishers
Release of Inorganic Phosphate into the Tumor Environment: Possible Roles of Ecto- Nucleotidases and Ecto-Phosphatases by Marco Antonio Lacerda-Abreu and José Roberto Meyer- Fernandes in Journal of Cancer Research Crimson Publishers _ Novel Approaches in Cancer Study Inorganic phosphate (Pi) is essential for several biochemical reaction. Serum Pi is maintained at relatively narrow range concentrations, between 0.7 and 1.55mM. Tumor microenvironment presents a high Pi concentration (1.8±0.2mM Pi) and this could be associated wi the rapid growth in the “Growth Rate Hypothesis”. Several studies have identified high expression of Pi transporters in various tumor tissues. Similarly, ecto-enzymes (like ecto-nucleotidases or ecto- phosphates) act by dephosphorylating phosphosubstrates in the extracellular environment, and its high expression has been observed in various types of cancer. Little is known about the function of these ecto-enzymes on Pi releasing and accumulation in the tu...