Phosphodiesterase 4 inhibition enhances the dopamine D1 receptor/PKA/DARPP-32 signaling cascade in frontal cortex. - Kuroiwa, Mahomi; Snyder, Gretchen; Shuto, Takahide; Fukuda, Atsuo; Yanagawa, Yuchio; Benavides, David; Nairn, Angus; Bibb, James; Greengard, Paul; Nishi, Akinori (Psychopharmacology, 2012)