- Renin inhibitor aliskiren improves impaired nitric oxide bioavailability and protects against atherosclerotic changes. Imanishi, T., Tsujioka, H., Ikejima, H., Kuroi, A., Takarada, S., Kitabata, H., Tanimoto, T., Muragaki, Y., Mochizuki, S., Goto, M., Yoshida, K., Akasaka, T. Hypertension (2008)