Expression of anaphase-promoting complex 5 in balloon angioplasty-injured rat carotid arteries and mitogen-stimulated human vascular smooth muscle cells

We utilized differential display to identify differentially expressed mRNAs induced by balloon angioplasty injury. A recently described subunit of the anaphase-promoting complex, APC5, is not expressed in uninjured rat caroti d arteries, Expression of APC5 mRNA is detectable as early as 1 day post-in jury, reached maximal levels by 3-7 days, and declined by 14 days post-inju ry. APC5 is not expressed in serum-starved cultured human vascular smooth m uscle cells (VSMC), but is strongly induced by mitogenic factors, and to a lesser extent by nonmitogenic cytokines, The kinetics of APC5 expression is associated with cell cycle progression, and corresponds with PCNA expressi on in PDGF-stimulated human VSMC, Interestingly, APC5 is expressed in most human tissues examined, regardless of their proliferative state. These data are the first description of the cytokine-inducible expression of APC5 and suggest that expression of this gene may represent an important event in t he pathogenesis of vascular proliferative diseases. (C) 2001 Academic Press .