Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Tristano, A.G. et al.

Effects of statin treatment and withdrawal on angiotensin II- induced phosphorylation of p38 MAPK and ERK1/2 in cultured vascular smooth muscle cells.

Abrupt discontinuation of 3-hydroxy-3-methylglutaryl-coenzyme-A-reductase inhibitors (statins) is associated with increased cardiovascular risk. To investigate the molecular mechanisms determining the increased cardiovascular risk after statin withdrawal, we studied the effects of statin treatment and withdrawal on angiotensin II (AII) actions in rat aortic vascular smooth muscle cells (VSMC) in culture. In VSMC, AII stimulated the phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2), and of p38 mitogen-activated protein kinase (p38 MAPK), with an EC50% of 0.86 and 3nM, respectively. Maximal stimulation was observed after 5-10min of exposure to AII. Pretreatment with 1-3muM simvastatin for 24h inhibited AII-mediated stimulation of ERK1/2 and p38 MAPK phosphorylation; without affecting the levels on non-phosphorylated MAPK. Washout of simvastatin produced a rebound increase above control levels of AII-mediated phosphorylation of ERK1/2 and p38 MAPK. As previously reported for other agonists, the rebound increase of AII effects was observed from 1 to 3h after statin withdrawal, and was lost at later times. The basal levels of phosphorylation and the amount of non-phosphorylated kinases were unaffected by statin withdrawal. Similar effects were observed with lovastatin. Our results suggest that statins modulate AII effects in VSMC, and that transient increases in AII effects mediated via the MAPK pathway may play a role in the vascular dysfunction associated with statin withdrawal.[1]

References

Effects of statin treatment and withdrawal on angiotensin II-induced phosphorylation of p38 MAPK and ERK1/2 in cultured vascular smooth muscle cells. Tristano, A.G., Castejon, A.M., Castro, A., Cubeddu, L.X. Biochem. Biophys. Res. Commun. (2007) [Pubmed]

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