OBJECTIVES: Intracellularly generated reactive oxygen species (ROS) are thought to modulate redox sensitive signaling pathways and thus regulate cell physiology including proliferation and differentiation. However, the role of ROS in neuronal differentiation of embryonic pluripotent cells is unknown. For this reason, the modification of retinoic acid (RA) induced neuronal differentiation of mouse embryonal carcinoma cells P19 by selected ROS scavengers and flavoprotein inhibitor was evaluated. METHODS: Intracellular ROS was evaluated by flowcytometry. Cellular redox status was evaluated based on total levels of reduced thiol groups in cells. The activity of the RA responsive element (RARE) was evaluated by luciferase reporter assay. The RA-induced neuronal differentiation was determined based on changes in the expression of protein markers characteristic for undifferentiated (Oct-4) and neuron-like cell differentiated cells (N-cadherin and III-beta tubulin). RESULTS: RA increased the intracellular ROS production that was accompanied by a decrease in thiol groups in cells. The ROS scavengers and flavoprotein inhibitor reduced RA-induced ROS production, RA-induced activity of RARE, and it decreased the RA-induced expression of N-cadherin and III-beta tubulin. CONCLUSIONS: Our data outline a role of ROS as important molecules in the transduction of an intracellular signal during the neuronal differentiation of ES cells.

Institute of Biophysics Academy of Sciences of the Czech Republic Brno Czech Republic

Retinoic Acid Grafted to Hyaluronic Acid Activates Retinoid Gene Expression and Removes Cholesterol from Cellular Membranes

The acceleration of cardiomyogenesis in embryonic stem cells in vitro by serum depletion does not increase the number of developed cardiomyocytes