A) Representative immunoblots showing the status of regulators involving cell cycle progression. The results show that knockdown of Spry1 in hAoSMC decreases expression of cyclinD1, phosphorylation of pRb807/811, pCdc2 and pH3 compared to NT hAoSMC controls at 12 and 24 hours post-stimulation without affecting activation of pERK. However, basal pERK is increased at 36, 48 and 60 h post-stimulation. B, C, D, E) Quantification of the relative levels of cyclinD1 (B), pRbS807/811 (C), pRbS780 (D) and pFoxO1/3a (E) from A.