Abstract:
:Deficiency of tetrahydrobiopterin (BH4) in the vascular tissue contributes to endothelial dysfunction through reduced eNOS activity and increased superoxide anion (O2(-)) generation in the insulin-resistant state. We investigated the effects of atorvastatin, a 3-hydroxyl-3-methylglutaryl coenzyme A (HMG CoA) reductase inhibitor; amlodipine, a calcium antagonist; and their combination on blood pressure, arterial relaxation and contraction, and vascular oxidative stress in aortas of high fructose-fed rats. Oral administration of atorvastatin for 8 weeks did not significantly lower blood pressure, but normalized angiotensin II-induced vasoconstriction and endothelial function in the fructose-fed rats. Atorvastatin treatment of fructose-fed rats increased vascular BH4 content, which was associated with an increase in endothelial NO synthase activity as well as a reduction in endothelial O2(-) production. On the other hand, administration of amlodipine did not affect the angiotensin II-induced vasoconstriction and endothelial function, but normalized the elevated blood pressure in the fructose-fed rats. The combined treatment did not show synergistic but additive beneficial effects. The present study suggests that combined therapy of HMG-CoA reductase inhibitors and calcium antagonists prevents functional vascular disorders in the insulin-resistant state, possibly resulting in the protection against or delay of development of hypertension, vascular dysfunction in diabetes, and thereafter atherosclerosis.
journal_name
J Pharmacol Scijournal_title
Journal of pharmacological sciencesauthors
Okamura T,Tawa M,Geddawy A,Shimosato T,Iwasaki H,Shintaku H,Yoshida Y,Masada M,Shinozaki K,Imamura Tdoi
10.1254/jphs.13178fpsubject
Has Abstractpub_date
2014-01-01 00:00:00pages
76-85issue
1eissn
1347-8613issn
1347-8648pii
DN/JST.JSTAGE/jphs/13178FPjournal_volume
124pub_type
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