orobol and psi-tectorigenin

Isoflavonoid compounds, genistein, psi-tectorigenin and orobol have been implicated as inhibitors of tyrosine-specific protein kinase and phosphatidylinositol turnover. These compounds have been frequently used as a pharmacological tool to assess signal transduction pathways in various cell systems. In the course of analyzing signaling pathways in rat hepatocytes, we obtained an unexpected finding that these compounds transiently increase cytoplasmic free calcium. Since the Ca2+ mobilizing effect was observed in 1 microM calcium containing buffer, the source of the Ca2+ may be intracellular stores. Thus, when interpreting data obtained using these compounds, caution is needed.

Topics: Aequorin; Animals; Calcimycin; Calcium; Cells, Cultured; Cytosol; Enzyme Inhibitors; Flavonoids; Genistein; Isoflavones; Kinetics; Liver; Male; Protein-Tyrosine Kinases; Rats; Rats, Inbred Strains