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Review: Potential of renin inhibition in cardiovascular disease
Alice Stanton
Department of Clinical Pharmacology, Royal College of Surgeons in Ireland, St Stephen's Green, Dublin 2, Ireland, astanton{at}rcsi.ie
Since renin catalyses the first and rate-limiting step of the renin-angiotensin system (RAS) cascade, interruption of the generation of angiotensin II (Ang II) by renin inhibitors at this highly specific initial step of the cascade has long been a therapeutic goal. The early development of renin inhibitors was hampered by problems with bioavailability and high costs of synthesis. However, more recently a potent non-peptidic inhibitor of renin, aliskiren, with acceptable oral bioavailability, has been synthesised. Aliskiren effectively reduces Ang II levels in normal volunteers and has been shown to lower blood pressure (BP) in patients with mild-to-moderate hypertension.
Renin inhibitors would be expected to have similar, but not identical effects to those of the established RAS antagonists. Due to the lack of effective alternative enzyme pathways, blockade of Ang II production may be more effective with renin inhibition than with angiotensin-converting enzyme (ACE) inhibition.
Furthermore, because renin has high specificity for only one substrate, angiotensinogen, side-effects would be expected to be less frequent. It is currently unclear whether blockade of Ang II type 1 (AT1) receptors, leaving other Ang II receptors (AT2, AT3 and AT4) unblocked, is preferable to the reduction in plasma and tissue Ang II levels achieved with either ACE or renin inhibition.
Pharmacological suppression of the RAS, through ACE inhibition, or blockade of AT1, β-adrenoceptor or mineralocorticoid receptors, has been proven to reduce morbidity and mortality in patients with hypertension, diabetes mellitus, atherosclerosis, heart failure and nephropathy. While, to date, aliskiren has only been shown to reduce BP, it appears likely that orally-active renin inhibitors could prove useful in the management of a wide range of cardiovascular pathologies.
Key Words: renin renin inhibition renin angiotensin system blood pressure vascular disease atherosclerosis
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Journal of Renin-Angiotensin-Aldosterone System, Vol. 4, No. 1,
6-10 (2003)
DOI: 10.3317/jraas.2003.008

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