Breu V, Löffler B M, Clozel M
Pharma Division, F. Hoffmann-La Roche Ltd., Basel, Switzerland.
FEBS Lett. 1993 Nov 15;334(2):210-4. doi: 10.1016/0014-5793(93)81713-a.
Ro 46-2005 is a new synthetic non-peptide endothelin (ET) receptor antagonist. In binding experiments, Ro 46-2005 proved to be equipotent (IC50 200-500 nM) for inhibition of [125]ET-1 binding on the two known ET receptor subtypes (ETA and ETB). Scatchard analysis was consistent with a competitive binding mode. Ro 46-2005 also inhibited the functional consequences of ET-1 stimulation: the ET-1 induced release of arachidonic acid from rat mesangial cells was inhibited with an IC50 of 1.8 microM.