text: Blockade of PDE1 (8-methoxymethyl-3-isobutyl-1-methylxanthine, 100 microM), PDE2 [erythro-9-(2-hydroxy-3-nonyl)adenine, 30 microM], PDE3 (milrinone, 10 microM; cGMP, 10 microM), PDE4 (Ro 20-1724 [4-(3-butoxy-4-methoxybenzyl)imidazolidin-2-one], 100 microM), PDE5 and PDE6 (zaprinast, 30 microM), and << PDE7 >> [[[ BRL-50481 ]] (5-nitro-2,N,N-trimethylbenzenesulfonamide), 10 microM] did not alter renal ecto-phosphodiesterase activity.