Disclosed herein are methods of enhancing repair of vascular lesions involving the administration of cells in which TGF-β expression and/or activity has been transiently blocked. Other methods involve the administration of a TGF-β blocking agent to a subject who has a vascular lesion or is at risk of developing a vascular lesion. Alternatively, a TGF-β blocking agent and treated cells are co-administered to a subject in need thereof.