The present invention features a novel method of treating vascular disease that involves modifying smooth muscle cells to express a gene encoding a protein having both anti-inflammatory and pro-apoptotic activity. Preferably, the protein of the invention also has an anti-proliferative effect in smooth muscle cells. In general, the method is useful in preparing vascularized organs and vessels for transplant into a patient. Alternatively, the present invention can be applied to treat atherosclerotic lesions in damaged vessels.