- Agrotis A, Kanellakis P, Kostolias G, Di Vitto G, Wei C, Hannan R, et al. Proliferation of neointimal smooth muscle cells after arterial injury. Dependence on interactions between fibroblast growth factor receptor-2 and fibroblast growth factor-9. J Biol Chem. 2004;279:42221-9 pubmed..These studies demonstrate that, although multiple FGFRs are induced in neointimal SMCs following arterial injury, specific interactions between distinctly spliced FGFR-2 isoforms and FGF-9 contribute to the proliferation of these SMCs. ..