Essential role of phosphatidylinositol 3-kinase in insulin-induced activation and phosphorylation of the cGMP-inhibited cAMP phosphodiesterase in rat adipocytes. Studies using the selective inhibitor wortmannin - Rahn, T; Ridderstrale, M; Tornqvist, H; Manganiello, V; Fredrikson, G; Belfrage, P; Degerman, E (FEBS Lett, 1994)