tokens: Arteritis induced in rats by vasodilators , fenoldopam and theophylline , was examined immunohistochemically for expressions of inducible type of nitric oxide synthase ( iNOS ), basic fibroblast growth factor ( bFGF ) and tumor growth factor - beta1 ( TGF - beta1 ). Rats were administered fenoldopam for 24 hours by intravenous infusion with or without following repeated daily oral administrations of theophylline .